JPS6114236Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle-mounted speaker unit, and more specifically, to a vehicle-mounted speaker unit free from cross-modulation distortion.

Among vehicle-mounted speaker units, most two-way type speakers are of the coaxial type, but when this type of speaker unit is installed in the rear parcel tray of a passenger car, the sound axis of the speaker is located at the rear windshield. Because they intersect, the sound from these speaker units hits the rear windshield, and low-frequency sounds are not affected much, but high-frequency sounds are reflected by the shield glass and attenuated, and the cabin occupants are attenuated. The reality is that we have no choice but to listen to reproduced sounds that include high-frequency sounds.

Therefore, the axis of the tweeter unit intersects with the axis of the woofer unit, and the tweeter unit is mounted in an almost horizontal position on the frame of the upward-facing woofer unit, so that high-frequency sound is radiated toward the passenger side. It is provided with such consideration. That is, as shown in FIG.
A woofer unit 2 attached to the rear parcel tray 1 emits low-frequency sounds B, and high-frequency sounds T from tweeter units 3 attached to the woofer unit 2 are directly radiated into the cabin. However, when high-frequency vibration waves cross the air that is being vibrated at low frequencies, the high-frequency sound waves are shaken by the low-frequency sound waves and become distorted, resulting in so-called cross-modulation distortion. There are drawbacks.

This idea aims to provide a car speaker unit that can reproduce high-frequency sounds without such cross-modulation distortion, and for this purpose, it is necessary to create a speaker unit that is located virtually on the front side of the tweeter unit with respect to the sound axis of the woofer unit. The tweeter unit is characterized in that the tweeter unit is attached to the woofer unit so that the sound axes of the tweeter unit and the woofer unit do not intersect with each other.

Hereinafter, details of this invention will be explained with reference to FIG. 2 of the accompanying drawings. First, in FIG. 2, reference numeral 1 indicates a woofer unit, and the front surface of this woofer unit 10 has a front grill 11.
This front grill consists of a front frame 11a and a mesh material 11b stretched over it.

On the listener side of the front grill 11, there is a tweeter accommodation chamber 12 formed by protruding the front frame 11a. An acoustic lens 13 is attached to the opening.

A tweeter unit 20 is housed in the accommodation chamber 12, and sound waves emitted from the tweeter are propagated into the cabin via an acoustic lens 13. Therefore,
The sound axis T of the tweeter unit 20 and the sound axis B of the woofer unit 10 are arranged such that the two axes can be perpendicular to each other when viewed from the side when the tweeter unit 20 is attached to the rear parcel tray R of a passenger car. ing. In other words, the optical axis on the front side of the tweeter unit 20 does not intersect with the optical axis of the woofer unit 10.

Since this invention has such a structure, the sound waves radiated from the woofer unit 10 do not fluctuate the sound waves radiated from the tweeter unit 20 to cause cross-modulation distortion.

In the above embodiment, the tweeter unit 20 is attached to the woofer unit 10 on the listener side of the cabin in a state where it is attached to the rear parcel tray. However, as shown in Figs. 5 and 6,
The tweeter unit 20 may be mounted near the side of the vehicle or at a position slightly forward or backward from the side to prevent cross modulation distortion of high frequency sound waves due to low frequency sound waves.

As is clear from the above explanation, in the in-vehicle speaker unit of this invention, the tweeter unit is integrally attached to the woofer unit, and the attachment position is closer to the interior of the room.
The front sound axis of the tweeter unit is configured so that it does not intersect with the sound axis of the woofer unit, so the tweeter unit itself does not shake.
Since the high frequency sound waves are not disturbed by the low frequency sound waves, it is possible to enjoy reproduced sound without causing cross modulation distortion.

[Brief explanation of the drawing]

Figure 1 is a side view showing how a conventional car speaker unit is installed, Figure 2 is a sectional view of the car speaker unit according to this invention, Figure 3 is a side view showing how it is installed, and Figure 4 is the same. FIG. 5 is a plan view of a vehicle-mounted speaker unit according to another modified embodiment, and FIG. 6 is a plan view of the same vehicle-mounted speaker unit. 10...Woofer unit, 11...Front grill, 11a...Front frame, 11b
...Mesh material, 12...Accommodation chamber, 13...
...Acoustic lens, 20...Tweeter unit, T...
...The sound axis of the tweeter unit, B...The sound axis of the woofer unit.

Claims (1)

[Scope of utility model registration request] An in-vehicle speaker unit, which includes a woofer unit for reproducing low-frequency sounds, a front grill that covers the front surface of the woofer unit, a tweeter housing chamber mounted on the front grill, and the woofer unit. A tweeter unit for reproducing high-frequency sound having a sound axis that does not intersect with the sound axis and directly fixed to the tweeter housing chamber, and an acoustic lens disposed in front of the tweeter unit. In-vehicle speaker unit.