JPH0714798U - Coaxial speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a core loudspeaker capable of improving workability for attaching dustproof means, completely preventing intrusion of fine dust, and eliminating abnormal vibration of a vibration system. . [Constitution] In a coaxial speaker in which a tweeter 12 or a tweeter supporter 11 is arranged coaxially with the woofer 1, a magnetic fluid 14 is held between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7. The tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7 were sealed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coaxial loudspeaker suitable for applications requiring severe dustproof measures such as a carcoaxial loudspeaker.

[0002]

[Prior art]

 Prior art of the coaxial loudspeaker in which dust-proof measures are taken is, for example, that shown in FIG. 2, JP-A-56-152481, JP-A-60-239198, JP-A-64-55796, etc. There is a technology described in.

In the prior art shown in FIG. 2, a dustproof cloth 16 is attached between the front end portion of the tweeter supporter 11 and the woofer cone paper 8. In FIG. 2, the same members as those shown in FIG. 1 are designated by the same reference numerals.

In the technique disclosed in Japanese Utility Model Laid-Open No. 56-152481, there is a bellows-like structure between the spacer fixed to the top of the center pole of the bass speaker and the neck of the diaphragm of the bass speaker. The damper is attached.

Further, in the technique described in Japanese Patent Laid-Open No. 60-239198, a support rod is attached to the top of the center pole of the bass speaker, and a treble speaker is fixed to the front end of the support rod. In the composite speaker, a soft polymer foam is placed between the front end of the support rod or the rear end of the high-frequency speaker and the center of the voice coil bobbin of the low-frequency speaker or the diaphragm of the low-frequency speaker. It is inserted and fixed.

Further, in the technique disclosed in Japanese Utility Model Laid-Open No. 64-55796, a spacer having a flange protruding outward is fixed to the front end surface of the center pole of the bass speaker, and the spacer is attached to the center. In a composite speaker with a high-tone speaker attached, a vertical damper is interposed and fixed between the central portion of the diaphragm of the low-tone speaker and the flange of the spacer.

[0007]

[Problems to be solved by the device]

 In the above-mentioned conventional techniques, all of them have problems of poor workability for attaching the dustproof means, it is difficult to completely prevent intrusion of fine sand dust, and the dustproof means adversely affects the performance of the vibration system, and It had at least one of the problems of increasing the resonance frequency and causing abnormal vibrations in the midrange.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the workability for attaching the dustproof means and completely prevent the intrusion of fine dust. Moreover, it aims to provide a coaxial speaker capable of eliminating the abnormal vibration of the vibration system.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a coaxial loudspeaker in which a tweeter 12 or a tweeter supporter 11 is arranged coaxially with the woofer 1, and the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7 are connected to each other. A magnetic fluid 14 is held between the tweeters 12 or tweeter supporters 11 and the woofer voice coil bobbin 7 is sealed.

[0010]

[Action]

 In the present invention, the magnetic fluid 14 is held between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7, and the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7 are sealed. Even fine dust can be completely prevented from entering.

Further, in the present invention, since it is sufficient to hold the magnetic fluid 14 between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7, there is no complicated process for attaching the dustproof means, Workability can be greatly improved.

Further, in the present invention, since the magnetic fluid 14 can hold the central portion of the vibration system, the vibration system is not adversely affected, and therefore, the rise of the minimum resonance frequency and the abnormality in the middle range are prevented. Vibration etc. can be eliminated.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention and is a longitudinal sectional view of a half portion.

In the embodiment shown in FIG. 1, a tweeter supporter 11 is fixed at the center of the woofer 1, and a tweeter 12 is attached to the front end of the tweeter supporter 11.

The woofer 1 includes an inverted T-shaped bottom yoke 2, a woofer magnet 3 installed on the flange of the woofer 1, a top plate 4 installed on the woofer magnet 3, and The voice coil 6 wound around the woofer voice coil bobbin 7 and disposed in the magnetic gap of the magnetic circuit, and the frame 5 connected to the woofer voice coil bobbin 7 through the gasket 9. It has a woofer cone paper (vibration plate) 8 attached to the woofer, a woofer voice coil bobbin 7 and a damper 10 provided between the bottom of the frame 5.

The tweeter supporter 11 is fixed to the center pole of the bottom yoke 2.

By the way, in this embodiment, the magnetic fluid 14 is sealed in the gap 13 between the tweeter supporter 11 and the woofer voice coil bobbin 7. The magnetic fluid 14 is held by a magnetic fluid holding magnet 15 provided in the tweeter supporter 11 at a right angle to the central axis of the speaker so as to correspond to the sealed position of the magnetic fluid 14 and the tweeter supporter 11 and the woofer. The gap 13 between the voice coil bobbins 7 is sealed.

As described above, in this embodiment, since the magnetic fluid 14 held by the magnetic fluid holding magnet 15 seals the gap 13 between the tweeter supporter 11 and the woofer voice coil bobbin 7, it is fine. Even dust can be completely prevented from entering. Therefore, it is extremely effective when applied to in-vehicle coaxial speakers.

Further, in this embodiment, since it is sufficient to hold the magnetic fluid 14 between the tweeter supporter 11 and the voice coil bobbin 7 for the woofer, it is not necessary to perform a complicated process such as adhesion for attaching the dustproof means. Since it is not present, the installation workability can be greatly improved.

Further, in this embodiment, as can be seen from FIG. 1, since the magnetic fluid 14 can hold the central portion of the vibration system, the vibration system is not adversely affected. Therefore, it is possible to eliminate the rise of the minimum resonance frequency in the vibration system and the abnormal vibration in the middle range.

[0022] Then, according to this embodiment, the mechanical resistance caused by the viscosity of the magnetic fluid can be expected to reduce the Q _MS in low frequency (Quality of Mechanical System).

The present invention may be configured to hold the magnetic fluid 14 between the tweeter 12 and the woofer voice coil bobbin 7 depending on the type of the entire speaker.

[0024]

[Effect of device]

 As described above, in the present invention, the magnetic fluid 14 is held between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7, and between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7. Since the gap 13 can be sealed, even fine dust can be completely prevented from entering, and the magnetic fluid 14 is provided between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7. Since it is sufficient to hold it, there is no complicated process for attaching the dustproof means, and the effect that the attaching workability can be greatly improved, as well as the magnetic fluid 14 can hold the center of the vibration system. Therefore, it does not adversely affect the vibration system, thus eliminating the rise of the minimum resonance frequency and abnormal vibration in the mid range. There is that effect.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a longitudinal sectional view of a half portion.

FIG. 2 is a half sectional view showing a conventional technique.

[Explanation of symbols]

1 Woofer 7 Voice coil bobbin for woofer 11 Tweeter supporter 12 Tweeter 13 Gap between tweeter supporter and voice coil bobbin for woofer 14 Magnetic fluid 15 Magnet for retaining magnetic fluid

Claims (1)

[Scope of utility model registration request] 1. A coaxial loudspeaker in which a tweeter 12 or a tweeter supporter 11 is disposed coaxially with a woofer 1, and a magnetic fluid 14 is held between the tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7. The tweeter 12 or tweeter supporter 11 and the woofer voice coil bobbin 7 are sealed between the coaxial loudspeaker.