JPH05252586A - Twin tweeters - Google Patents

Abstract

PURPOSE: To provide a speaker system which provides spatial sound reproduction that is improved in terms of the upper register and is substantially irrelevant to the seat position of a listener. CONSTITUTION: A housing component is equipped with a funnel-shaped recessed part 4, a nearly semicircular upper region 5 of the recessed part and a nearly semicircular bottom part region 6 which is a little smaller than the upper region 5 are formed so that two straight lines which are as long as each other cross at an angle α less than 180 deg. inside the recessed part by joining end parts of both regions of the upper region 5 and bottom region 6 together, and while one tweeter 3.1 is installed at one flat side wall part of the recessed part, the other tweeter 3.2 is installed at the other flat side wall part of the recessed part, and both tweeters 3.1 and 3.2 emit sound pressure toward the side wall part of the arc part of the recessed part, the side wall part of the arc part is circular in a plane, but curved in vertical section, and the center lines of the two tweeters 3.1 and 3.2 have convergence at an angle β=180 deg.-α.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device, and more particularly, to an arrangement of high-pitched speakers used in an automobile.

[0002]

2. Description of the Prior Art The method used when good sound reproduction is required requires that the broadcast be in the frequency band desired by several speakers rather than a single speaker. However, when this is done, the broadcast frequency band is not treated equally by all speakers. Rather, in such cases, it is common to have high-frequency, mid-frequency and low-frequency sounds, e.g. radiated by different speakers, each of which is specially matched to the broadcast sound area. It A crossover network or speaker splitting network is placed between the amplifier output and the speaker to enable high frequency sound radiated from the treble speaker and low frequency sound radiated from the low frequency speaker. Such a speaker division network is a very common component and its mode of operation need not be discussed further.

For example, if treble, midrange and bass speakers are combined in a speaker box, a speaker box constructed in this way will not produce a suitable sound even when the individual speakers are of the best quality. Absent. Such drawbacks, within certain limits, are rectified by the use of equalizers. The method of operation of the equalizer is generally known and need not be described in detail here.

Appropriate adjustment of the box concept is relatively straightforward when it is a problem to place the box in a large regular space (hereinafter referred to as the spatial concept).

However, when the arrangement of boxes is formed in the interior space of an automobile, the optimal method is considerably more difficult than the optimal method in the case of the space concept. The main reason for this is
The interior of the car is a narrow space, and the presence of seats and upholstery materials creates a strong damping effect. In addition, the effective space for installing the speaker and the entire speaker box in a vehicle is extremely limited, so that it can be used, for example, in stereos placed in different positions in different parts of the vehicle without being in close proximity to each other. Speakers that carry the channels are generally effective. As already mentioned in connection with the spatial concept, this type of optimisation is not fully obtained by the acoustic properties characteristic of the spatial concept, but the acoustic reproduction of the vehicle is improved by the use of an equalizer.

Since the use of equalizers does not achieve optimal acoustic properties in the interior of automobiles, or is achieved only conditionally, various concepts have been developed for acoustics for particular locations within the automobile, such as the driver's seat. It is proposed to be limited to seeking optimality. However, such an arrangement
The disadvantage is that the optimum acoustic properties at a particular location necessarily lead to acoustic deterioration at all other locations.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a loudspeaker system which does not have the above-mentioned drawbacks, provides an improved spatial acoustic reproduction, at least with respect to the treble, and is substantially independent of the listener's seat position. And

[0008]

This problem is solved by providing a housing part having a generally funnel-shaped recess. The top and bottom regions of the recess are approximately semi-circular, with the bottom region somewhat smaller than the top region. Two straight lines of approximately equal length joining the ends of the arc of the top region and joining the corresponding ends of the arc setting the extent of the bottom region form an angle α of less than 180 ° inside the recess .. (The two straight lines define the two flat sidewall portions of the recess.) This problem also places one of the treble loudspeakers on one of the flat sidewall portions and the second on the other flat sidewall portion.
Solved by placing the treble speaker in.
Therefore, both speakers radiate sound pressure in the direction of the side wall of the concave portion which is arcuate when viewed from above and which is curved concavely in the vertical section. Further, the vertical axes of the two speakers intersect at an angle β where the angle β = 180 ° −α. According to the Applicant's insight, the good sound reproduction characteristics achieved by the speaker device according to the present invention show that the proposed speaker device of an automobile is installed in both the left and right halves of the automobile dashboard. It is obtained by the fact that the windshield propagates directly to the driver's seat and the passenger seat without disturbing the sound radiation. It is substantially independent of seat position because the two treble loudspeakers are set at an angle with the circular curve of the housing parts to ensure a substantially uniform emission of high frequency sounds within the vehicle.
When the loudspeaker device according to the invention is coupled to a motor vehicle as described above, it has the additional advantage of being effective in improving acoustics at high frequencies not achieved by the equalization device.

Advantageous embodiments and further developments of the invention are specified in claims 2-5. It has been found to be particularly effective to form an angle β equal to about 30 °, which value has been found to give optimum sound reproduction on many different vehicles. The same can be said for the characteristics (tilt) of the side wall portion of the high-pitched speaker installed as disclosed in claim 5. This does not mean that the discussed angles must be limited to these particular values. Rather, the defined value range is used in a sufficient range.

[0010]

The present invention will be described in detail with reference to the drawings.
The speaker device 1 according to the invention comprises a housing part 2
Essentially formed from. The housing part 2 has a circular outer shape, and is provided with a substantially funnel-shaped recess 4 located at the center thereof. The semicircular upper region 5 of this recess
And a semi-circular bottom region 6 which is somewhat smaller than the top region 5 has two equal lengths connecting the arc of the top region 5 or the bottom region 6 (in the respective planes of these regions) and its end 8. Straight lines 7.1 and 7.2 are formed so as to intersect each other to form an angle α inside the recess. High-pitched speakers 3.1 and 3.2 have recesses 4 (straight line 7.1 or
7) will be installed on flat wall sections 9.1 and 9.2).

As can be seen easily from the drawing, a carrot type (cone type) high-pitched speaker used here 3.
1, 3.2 is also equipped with an acoustic diffuser.
Sidewall portion 9. As is shown in detail by FIG.
1 and 9.2 are each set at an angle of about 30 ° with respect to the horizontal bottom region 6 of the recess. Since the angle α formed by the two straight lines 7.1 and 7.2 is about 150 °, the angle β that is the convergence angle of the center lines (vertical axis) of the two high-pitched loudspeakers 3.1 and 3.2 is about 30 ° in FIG. is there.

The concave shape of the side wall portion 9.3 of the recess 4 is shown in FIG.
Clearly indicated by. FIG. 3 shows that the side wall portions 9.1 and 9.2 in which the treble speaker is installed are flat surfaces.

The perspective view of the speaker device according to the invention shown in FIG. 2 further shows that the transition 10.1 at the end 8 of the semicircular side wall part 9.3 joining the side wall parts 9.1 and 9.2 is substantially curved. .. This curved shape has the advantage that it further improves the acoustic properties of the arrangement of speakers according to the invention.

The symmetrical arrangement of the two treble loudspeakers 3.1 and 3.2 in the embodiment shown here does not represent an essential feature of the invention. For example, a speaker
There is no reason why 9.1 should not be installed at an angle of 10 ° with respect to line AA in FIG. 1, in which case the other speaker is installed at an angle of 20 ° with respect to line AA. Such a variation of the speaker device 1 makes it possible to adapt the acoustic reproduction to a particular vehicle by installing it at a particular angle and / or to optimize it for this particular type of vehicle. Therefore, it is possible to further improve the acoustic characteristics in the high frequency region. However, it must be borne in mind in this connection that the vehicle's stereo sound reproduction requires housing parts with these specific angular values provided on each side of the dashboard. This means a considerable increase in the cost of stamping.

It should be noted that when the housing part 2 is formed in a motor vehicle, its recess 4 is of course covered by a suitable grid.

[Brief description of drawings]

FIG. 1 is a plan view of a speaker device.

FIG. 2 is a perspective view of the speaker device shown in FIG.

3 is a cross-sectional view of the speaker device taken along the line AA in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Speaker device, 2 ... Housing parts, 3 ... High frequency speaker, 4 ... Recessed part, 9 ... Side wall part.

Claims (5)

[Claims] 1. A speaker device having a housing part and two treble loudspeakers mounted in the housing part, wherein the housing part comprises a funnel-shaped recess, the semi-circular upper region of the recess and the upper region The slightly smaller, approximately semi-circular bottom region is such that two straight lines of equal length join the ends of the arcs of both the top region and the bottom region to form an angle α of 180 ° or less inside the recess. One treble speaker is installed on one flat side wall part of the recess, another treble speaker is installed on another flat side wall part of the recess, and both treble speakers are installed on the side wall part of the arc part of the recess. Radiates sound pressure in the direction of, and the side wall portion of the arc portion is circular in a plan view and curved in a vertical cross section.
A speaker device, wherein the center lines of two treble loudspeakers converge at an angle β which is an angle β = 180 ° −α. 2. The speaker device according to claim 1, wherein the angle β is 25 to 45 °, preferably 30 °. 3. The speaker device according to claim 1, wherein the transition portion from the circular side wall portion to the flat side wall portion and the transition portion between the two flat side wall portions are curved surfaces. 4. The slope of the flat sidewall portion and the orientation of the treble speaker centerline are selected such that the virtual extension of the treble speaker centerline is located well above the upper edge of the circular sidewall portion. 4. The method according to claim 1, wherein
The speaker device according to claim 1. 5. The slope of the flat sidewall portion where the treble speaker is installed in the flat sidewall portion is about 25 to 35 ° with respect to the horizontal bottom region of the recess, preferably 3.
The speaker device according to claim 4, wherein the speaker device has an angle of 0 °.