KR100651020B1 - A structure for portable acoustic device with two way micro speaker - Google Patents

Abstract

An exterior speaker structure using a both directional micro speaker unit is provided to efficiently output an electric signal to a sound by having high efficiency through a duct structure. A speaker body(22) has a circuit for amplifying a signal. A speaker unit(24) reproduces a sound. A both directional micro speaker unit is installed on the inside of the speaker unit(24). A sealed resonant space unit coupled to a magnetic space unit of a vibrating plate through a ventilation hole of a woofer unit of the both directional micro speaker unit is formed on the speaker unit(24). A sealed resonant space unit coupled to a magnetic space unit of the vibrator through a ventilation hole of a tweeter/squawker unit is formed on the speaker unit(24). A duct unit to reflect a generated sound is formed on a front part of the woofer unit and a tweeter/squawker unit of the both directional micro speaker unit. A separation membrane separates the resonant space unit coupled to the woofer unit of the both directional micro speaker unit and the resonant space unit coupled to the tweeter/squawker unit for minimizing an interference of the sound.

Description

External speaker structure using bidirectional micro speaker unit {A STRUCTURE FOR PORTABLE ACOUSTIC DEVICE WITH TWO WAY MICRO SPEAKER}

1 is a cross-sectional view of a conventional unidirectional external speaker structure.

Figure 2 is a schematic diagram of an external speaker using a two-way micro speaker unit, according to an embodiment of the present invention.

3 is a cross-sectional view of a speaker unit of an external speaker using a bidirectional micro speaker unit, according to an embodiment of the present invention.

4 is a cross-sectional view of a speaker unit of an external speaker using a bidirectional micro speaker unit according to another exemplary embodiment of the present invention.

5 is a partially cutaway perspective view of a speaker unit of an external speaker using a bidirectional micro speaker unit according to another exemplary embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

10: one-way external speaker 11: body

12: top plate 13: permanent magnet

14 yoke 15 voice coil

16: diaphragm

20: bidirectional external speaker of the present invention

22: body 24: speaker unit

24a: speaker unit body
30: woofer part 30a: diaphragm
30b: voice coil 30c: magnetic space part
31: York 31a: permanent magnet
31b: top plate
32: tweeter / squaker part 32a: diaphragm
32b: voice coil 32c: magnetic space part
33a, 33b: ventilation holes

34a, 34b: resonance space portion 36a, 36b: duct portion

38: barrier

The present invention relates to an external speaker structure using a bidirectional micro speaker unit, and more particularly, to a speaker structure of a small portable acoustic device having a resonance space portion and a bidirectional duct structure in order to improve acoustic characteristics of a bidirectional micro speaker.

A typical external speaker vibrates the diaphragm attached to the voice coil by a force generated by magnetic force and current according to Flaming's left hand law between the permanent magnet and the voice coil, thereby producing sound.

The conventional external speaker is a unidirectional speaker having only one diaphragm and emits sound in only one direction, and selects its characteristics by using variables such as material and structural size of the diaphragm and uses it in a necessary part. There are limitations in miniaturization due to the deterioration of acoustic characteristics of 20Hz ~ 1KHz and high and medium frequency band (1KHz and above), and at least two speakers must be used in order to make use of both characteristics.

1 is a cross-sectional view of a conventional unidirectional external speaker structure.

Referring to FIG. 1, the conventional unidirectional external speaker 10 is provided with a speaker unit having a structure in which sound of a speaker is radiated in a unidirectional direction to the speaker body 11. Such a unidirectional external speaker emits sound in only one direction, and since the tweeter / squaker part alone cannot fully utilize the sound characteristics of the low frequency part, a woofer part separate from the speaker is utilized to utilize the sound characteristics of the low frequency part. It is true. In other words, two speakers (woofer, tweeter / squaker) are installed to reproduce sound.

The inventors of the present invention, in order to overcome the above problems, the woofer part of the bass unit and the tweeter / squaker part of the treble unit are integrated 'bidirectional micro speaker for mobile communication terminal with increased electromagnetic waves' (Patent Application No. 10-2002-0082525) Filed on December 23, 2002, and in order to maximize the vibration force of the diaphragm, the tweeter / squaker part is outputted by forming ventilation holes in the support frame as well as the tweeter / squaker part side and optimizing the area of the diaphragm. As of January 28, 2004, he invented 'bidirectional micro speaker for mobile communication terminal to increase vibration force' (Patent Application No. 10-2004-0005510) that can realize sound efficiently and maximize sound uniformity. Filed.

 In addition, the present inventors to form the position of the ventilation hole formed on the woofer portion side and the ventilation hole formed on the tweeter / squaker section side to shift the side ventilation holes to minimize the negative interference phenomenon of the two-way micro speaker Invented the 'ventilating hole forming structure of the bidirectional micro speaker' (Patent Application No. 10-2004-0066224) and filed on August 23, 2004.

The present inventors have developed a structure of a speaker unit capable of improving the sound characteristics of a high-pitched part and a low-pitched part by using the bidirectional micro speaker of the patent application.

The present invention has been made to solve the problems of the conventional unidirectional speaker structure, the object of the present invention according to the commercialization of the multimedia mobile phone and the universalization of MP3 devices, the compact, portable and excellent sound output characteristics of the two-way micro speaker To provide the structure.

Another feature of the present invention is to provide a structure of a two-way micro speaker that can implement not only the characteristics of the sound of the high frequency band, but also the low frequency band by using a two-way speaker that was not used as a conventional external speaker. will be.

In order to achieve the above object, the present invention is an external speaker structure using a two-way micro speaker unit, including a speaker body with a circuit for amplifying a signal, and a speaker unit for reproducing sound,
The speaker unit has a built-in two-way micro speaker unit,
The speaker unit has a sealed resonance space portion communicating with the magnetic space inside the diaphragm through the ventilation hole of the woofer portion of the bidirectional micro speaker unit, and the airtight hole communicating with the magnetic space inside the diaphragm through the ventilation hole of the tweeter / squaker. Resonant space part is formed,
In front of the woofer part and the tweeter / squaker part of the bidirectional micro speaker unit, a duct part is formed in which the generated sound is radiated.
The resonance space portion in communication with the woofer portion of the bidirectional micro speaker unit and the resonance space portion in communication with the tweeter / squaker part are separated by a barrier to minimize sound interference.

Preferably, the resonance space portion communicating with the woofer portion of the bidirectional micro speaker unit has a larger space than the resonance space portion communicating with the tweeter / scooter portion in order to improve the sound of the low frequency band.

Preferably, the duct portion in front of the tweeter / squaker section of the bidirectional micro speaker unit is formed longer than the duct portion in front of the woofer portion in order to improve the sound of the medium frequency band.

The speaker part may have a cylindrical, polygonal, or spherical shape as a whole.

Hereinafter, an external speaker using the bidirectional micro speaker unit of the present invention will be described in detail with reference to the accompanying drawings.

The bidirectional micro speaker unit combines a tweeter / squawker section that generates sound in the high frequency band (1 KHz or more) with a woofer section that generates sound in the low frequency band (20 Hz to 1 KHz). Not only can the sound of the band be realized, but the sound is uniformized in each frequency band (high, medium, and low) so that a sound close to the original sound is reproduced. The present invention is a micro speaker structure with a built-in two-way micro speaker unit therein, by separating the reproduction space of the mid, high and low sound to improve the sound output characteristics.

2 is a schematic diagram of an external speaker using a bidirectional micro speaker unit according to an exemplary embodiment of the present invention.

The bidirectional micro speaker 20 includes a speaker body 22 and a speaker unit 24 connected thereto. The speaker body 22 is connected to an MP3 player, a compact cassette, a multimedia cellular phone, etc. through a cord line. The speaker body 22 includes a portable battery for driving the speaker unit, an amplifier (amplifier) for amplifying a weak input signal, a low pass filter (LPF) circuit, a volume control device, and the like. The signal amplified by the circuit inside the speaker body generates sound through the speaker unit 24.

The speaker part 24 is a part which generates sound substantially by the vibration of a diaphragm, and the speaker part 24 of FIG. 3 has a spherical shape as a whole, and has a structure having a duct part in a part where sound is radiated. Each speaker unit 24 has a built-in bi-directional micro speaker unit for generating sound can implement 2.1CH.

3 is a cross-sectional view of a speaker unit of an external speaker using a bidirectional micro speaker unit according to an exemplary embodiment of the present invention. That is, it is sectional drawing of the speaker part of FIG.

As shown, a bidirectional micro speaker unit is built in the speaker unit. The bidirectional micro speaker unit is divided into a woofer section 30 for generating low tone sound and a tweeter / scooter section 32 for generating high tone sound. The present inventors have applied for patents on various technologies as described above with respect to the bidirectional micro speaker unit, but when the bidirectional micro speaker unit is described in more detail, the woofer unit 30 is formed by the yoke 31 in the center. And the tweeter / scooter part 32, the permanent magnet 31a is located between the yoke 31 and the top plate (top plate, 31b). The voice coils 30b and 32b are positioned at regular intervals between the yoke 31 and the permanent magnet 31a, and the upper voice coil 30b is attached to the diaphragm 30a of the woofer part 30, and Voice coil 32b is attached to diaphragm 32a of tweeter / squaker part 32. The inner spaces surrounded by the diaphragms 30a and 30b are magnetic space parts 30c and 32c in which air is vibrated. The electrical signal causes the voice coil between the yoke and the permanent magnet to vibrate by the electromagnetic force, thereby generating sound while the diaphragm vibrates.
The present patent relates to a structure of a speaker unit capable of generating low tones as well as mid and high sounds using a bidirectional micro speaker unit.

As shown, it has ducts 36a and 36b for improving the acoustic characteristics of the high and midrange portions, and has sealed resonance spaces 34a and 34b for improving the acoustic characteristics of the bass portions. That is, the tweeter / scooter part 32 has a resonance space part 34a in communication with the magnetic space part 30c in the diaphragm 30a of the woofer part 30 of the bidirectional micro speaker unit and the ventilation hole 33a. Has a resonance space portion 34b communicating with the magnetic space portion 30c and the ventilation hole 33b inside the diaphragm 32a, and each of the resonance space portions 34a and 34b only communicates with the ventilation hole. It is sealed. In addition, in front of the woofer portion and the tweeter / squaker part to which sound is radiated, there are separate duct parts 36a and 36b.

The resonance space portion has a blocking film 38 formed between the resonance space portion 34a in communication with the woofer portion of the bidirectional micro speaker unit and the resonance space portion 34b in communication with the tweeter / squaker part so as to minimize negative interference. This is to prevent the interference of the high, middle and bass portion coming out of the ventilation hole without interfering with the ventilation hole formed in the side of the speaker unit or the axial ventilation hole.

It is also possible to further secure the necessary resonance space by changing the structure of the barrier film 38 in accordance with the acoustic characteristics, the length of the duct portion can also be adjusted as necessary according to the acoustic characteristics. That is, in order to improve the sound of the low frequency band, the resonance space portion 34a communicating with the woofer portion of the bidirectional micro speaker unit may be configured to have a larger space than the resonance space portion 34b communicating with the tweeter / squaker. In order to improve the sound of the high frequency band (1 kHz or more), the duct part 36b at the front end of the tweeter / squaker part of the bidirectional micro speaker unit may be formed longer than the duct part 36a at the front end of the woofer part. .

4 is a cross-sectional view of a speaker unit of an external speaker using a bidirectional micro speaker unit according to another exemplary embodiment of the present invention. FIG. 4 shows the speaker of FIG. 3 having a longer duct portion 36b at the front end of the tweeter / scooter portion to improve the sound characteristics of the midtone portion, and resonance of the woofer portion side to improve the sound characteristics of the bass portion. The structure of the barrier film is newly changed to make the space 34a larger.

 As shown in FIG. 4, in the present invention, the length of the duct portion and the size of the resonance space portion may be changed in order to improve sound characteristics of the bidirectional micro speaker.

5 is a partially cutaway perspective view of a speaker unit of an external speaker using a bidirectional micro speaker unit according to another exemplary embodiment of the present invention. That is, Fig. 5 shows a state in which a part of the speaker portion of the cylinder enhancement is cut out. A bidirectional micro speaker built inside is not shown.

The speaker portion of Fig. 5 also has duct portions 36a and 36b formed to improve the sound characteristics of the midtone portion, and has resonance space portions 34a and 34b to improve the sound characteristics of the bass portion.

As such, the shape of the speaker unit to which the speaker unit is mounted may be manufactured in various forms such as a cylinder or a polygonal pillar according to necessity or taste.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order to better understand the claims of the invention which will be described later. Additional features and advantages constituting the claims of the present invention will be described below. It should be appreciated by those skilled in the art that the conception and specific embodiments of the invention disclosed may be readily used as a basis for designing or modifying other structures for carrying out similar purposes to the invention.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art may be variously changed, substituted and changed without departing from the spirit or scope of the invention described in the claims.

As described above, the external speaker structure using the bidirectional micro speaker unit of the present invention has a much higher efficiency using the duct structure than the direct-radial speaker, so that the electrical signal is effectively output as sound output compared to the size of the unit. Strong directivity in the duct structure, the direct sound level on the axis is high, the critical distance is long, the amount of reflected sound can be relatively small, there is an advantage that high intelligibility can be secured to a long distance.

By collecting the low frequency band sounds generated by the two-way micro speaker unit to effectively utilize, the generated sound reduces the light feeling around the high frequency and gives a sense of stability. The bass section requires vibration of the diaphragm of greater displacement due to the material of the diaphragm and the frequency range generated, but the size of the unit of the present invention for the purpose of miniaturization is limited, so the vibration is secondary to the sealed resonance space part. By compensating for unnecessary vibrations such as mode, it is possible to double the effect of high output by digesting higher input value.

In this way, the speaker of the present invention can be connected to a device capable of playing music, such as MP3 and portable terminals, it is possible to implement a higher quality sound from the outside.

Claims (4)

As an external speaker structure using a bidirectional micro speaker unit, It includes a speaker body 22 with a circuit for amplifying a signal, and a speaker unit 24 for reproducing sound, The speaker unit 24 has a built-in two-way micro speaker unit, The speaker unit 24 has a sealed resonance space portion 34a communicating with the magnetic space portion 30c inside the diaphragm 30a through the ventilation hole 33a of the woofer portion 30 of the bidirectional micro speaker unit. And a closed resonance space portion 34b communicating with the magnetic space portion 32c inside the diaphragm 32a through the ventilation hole 33b of the tweeter / squaker portion 32, In front of the woofer part and the tweeter / squaker part of the bidirectional micro speaker unit, duct parts 36a and 36b are formed to emit generated sound. The resonance space portion 34a in communication with the woofer portion of the bidirectional micro speaker unit and the resonance space portion 34b in communication with the tweeter / squaker part are separated by the blocking film 38 to minimize sound interference. External speaker structure. The method of claim 1, External speaker, characterized in that the resonant space portion 34a in communication with the woofer portion of the bidirectional micro speaker unit has a larger space than the resonant space portion 34b in communication with the tweeter / scooter to improve the sound of the low frequency band. rescue. The method of claim 1, External speaker structure, characterized in that the duct section 36b in front of the tweeter / squaker section of the bidirectional micro speaker unit is longer than the duct section 36a in front of the woofer section in order to improve the sound of the medium frequency band (1 kHz or more). . The method of claim 1, The speaker unit is an external speaker structure, characterized in that the overall cylindrical, polygonal or spherical.

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