JP2012074780A - Speaker unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker unit for obtaining a moderate acoustic effect, while suppressing an installation space.SOLUTION: A speaker unit 10 includes: a woofer 11 for reproducing the low sound area component of an R signal (a right channel signal) and the low sound area component of an L signal (a left channel signal) through the use of an R voice coil 11a and an L voice coil 11b (a first voice coil and a second voice coil); an R tweeter 12 for reproducing the high sound area component of the R signal; and an L tweeter 13 for reproducing the high area sound component of the L signal.

Description

  The present invention relates to a speaker unit, and more particularly to a speaker unit that can obtain an appropriate acoustic effect while suppressing installation space.

  2. Description of the Related Art Conventionally, a speaker system that outputs various kinds of sound source information such as music and voice in a passenger compartment such as an automobile is known. In many cases, such a speaker system includes a tweeter that outputs a high-frequency sound in addition to the main speaker.

  The sound source handled by the speaker system is usually a stereo signal composed of an R (Right) signal and an L (Left) signal. In such a stereo signal, it is preferable that the R signal is heard from the right side and the L signal is heard from the left side. For this reason, in a speaker system, it is common to install a main speaker and tweeter for R signal on the right side of the vehicle and a main speaker and tweeter for L signal on the left side of the vehicle.

  For example, Patent Document 1 discloses a speaker system in which an R signal main speaker and a tweeter are installed on a right front door, and an L signal main speaker and a tweeter are installed on a left front door. Such a speaker system also includes two main speakers and two tweeters for the rear seats on the left and right sides of the vehicle. That is, in the speaker system described in Patent Document 1, a total of six speakers are installed in the vehicle interior.

JP 2001-065998 A

  However, if a plurality of speakers are mounted in the vehicle interior as in the speaker system described in Patent Document 1, it is necessary to secure an installation space for each speaker, which increases restrictions on vehicle design. There was a problem.

  Moreover, even if each speaker can be manufactured at low cost or light weight, there is a problem that the cost and weight increase by mounting a plurality of speakers.

  On the other hand, in a small and inexpensive vehicle such as a light vehicle, it may be preferable to mount a compact and inexpensive speaker system rather than mounting a speaker system with excellent acoustic performance.

  For these reasons, how to realize a speaker unit capable of obtaining an appropriate acoustic effect while suppressing installation space has become a major issue.

  The present invention has been made to solve the above-described problems caused by the prior art, and an object of the present invention is to provide a speaker unit that can obtain an appropriate acoustic effect while suppressing installation space.

  In order to solve the above-described problems and achieve the object, the present invention is a speaker unit in which a plurality of speakers are integrally incorporated, and a right channel signal using a first voice coil and a second voice coil. A woofer that reproduces the low-frequency component of the left channel signal and a low-frequency component of the left channel signal, a tweeter for the right channel that reproduces the high-frequency component of the right channel signal, and a tweeter for the left channel that reproduces the high frequency component of the left channel signal It is characterized by comprising.

  According to the present invention, the first voice coil and the second voice coil are used to reproduce the low frequency component of the right channel signal and the low frequency component of the left channel signal, and the high frequency component of the right channel signal is reproduced. The right channel tweeter and the left channel tweeter that reproduces the high frequency range component of the left channel signal are provided, so that an appropriate acoustic effect can be obtained while suppressing installation space.

FIG. 1 is a diagram showing an outline of a speaker unit according to the present invention. FIG. 2 is a diagram illustrating the configuration of the speaker unit according to the present embodiment. FIG. 3 is a diagram illustrating an example of a specific configuration of the speaker unit. FIG. 4 is a diagram illustrating an arrangement example of speaker units. FIG. 5 is a diagram illustrating another configuration example of the speaker unit. FIG. 6 is a diagram illustrating another arrangement example of the speaker units. FIG. 7 is a diagram showing another configuration of the speaker unit.

  Exemplary embodiments of a speaker unit according to the present invention will be described below in detail with reference to the accompanying drawings. First, prior to detailed description of the embodiments, an outline of a speaker unit according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a speaker unit according to the present invention.

  1A shows an example of a conventional speaker system and an example of a speaker unit according to the present invention, and FIG. 1B shows acoustic effects obtained by the speaker unit according to the present invention. Show.

  In the following, the case where the speaker unit according to the present invention is used as a vehicle-mounted speaker unit will be described. However, the speaker unit according to the present invention can be applied to uses other than the vehicle-mounted speaker unit.

  As shown in FIG. 2A, in the conventional speaker system, the main speaker and tweeter for R signal (Rch) and the main speaker and tweeter for L signal (Lch) are individually installed.

  For example, as shown in (A-1) of the figure, in the conventional speaker system, a front tweeter for R signal, a front main speaker, and a rear main speaker are respectively installed on the right side of the vehicle, and the front for L signal is provided. A tweeter, a front main speaker, and a rear main speaker were each installed on the left side of the vehicle.

  As described above, in the conventional speaker system, the sound effect is enhanced by installing a plurality of speakers in appropriate positions (the right side of the vehicle for the R signal and the left side of the vehicle for the L signal) in the vehicle interior. In some cases, there was a problem in installation space and cost.

  Therefore, as shown in (A-2) of the figure, the speaker unit according to the present invention includes a woofer employing a dual voice coil, a tweeter for R signal (hereinafter referred to as “R tweeter”), and Incorporating a tweeter for L signal (hereinafter referred to as “L tweeter”) integrally reduces installation space and cost.

  In the speaker unit according to the present invention, the woofer reproduces the low frequency component of the R signal and the low frequency component of the L signal, the R tweeter reproduces the high frequency component of the R signal, and the L tweeter An appropriate acoustic effect can be obtained by reproducing the high-frequency component.

  Here, when the R tweeter and the L tweeter are integrally incorporated as in the speaker unit according to the present invention, the R tweeter and the L tweeter are provided close to each other, so that the R output from the R tweeter. There is a possibility that the side sound and the L side sound output from the L tweeter are separated and cannot be heard.

  Therefore, the speaker unit according to the present invention, as shown in (B) of the figure, even when the R tweeter and L tweeter are integrated, the sound from the R tweeter and the sound from the L tweeter. The arrangement of the R tweeter and L tweeter is devised so that can be heard separately. This point will be described later in the embodiment.

  Below, the Example about the speaker unit which concerns on this invention is described in detail. In the following, the case where the speaker unit according to the present invention is used as a vehicle-mounted speaker unit will be described.

  First, the configuration of the speaker unit according to the present embodiment will be described with reference to FIG. FIG. 2 is a diagram illustrating the configuration of the speaker unit according to the present embodiment. In the figure, only components necessary for explaining the characteristics of the speaker unit are shown, and descriptions of general components are omitted.

  As shown in the figure, the speaker unit 10 includes a woofer 11, an R tweeter 12, and an L tweeter 13.

  The woofer 11 is a speaker that reproduces low-frequency components of the R signal and the L signal that are stereo signals. Specifically, the woofer 11 reproduces the R signal output from the amplifier 21R of the main unit 20 using the R voice coil 11a, and the L signal output from the amplifier 21L of the main unit 20 to the L voice coil 11b. Use to play back.

  When the R signal and the L signal are respectively input to the R voice coil 11a and the L voice coil 11b, the woofer 11 outputs a sound having a low frequency range component with little phase change. The sound output from the woofer 11 is a synthesized sound (monaurally converted sound) of the R signal and the L signal.

  As described above, the woofer 11 is a dual voice coil type woofer that reproduces the low-frequency component of the R signal and the low-frequency component of the L signal using two voice coils.

  The main unit 20 amplifies various stereo signals (R signal and L signal) acquired from a DVD (Digital Versatile Disc) deck, a TV (Television) tuner, or the like, and outputs the amplified signals to an audio output device such as the speaker unit 10. Is a unit.

  Specifically, the main knit 20 includes amplifiers 21R and 21L and amplifiers 22R and 22L. Here, the amplifier 21R and the amplifier 22R are amplifiers that amplify the R signal, and the amplifier 21L and the amplifier 22L are amplifiers that amplify the L signal.

  As described above, the main unit 20 is generally provided with two pairs of an amplifier for the R signal and an amplifier for the L signal, and these pairs are respectively used for the front seat and the rear seat, for example. Used.

  Here, the R-side input terminal of the speaker unit 10 is connected to the amplifier 21R, and the L-side input terminal is connected to the amplifier 21L. Thus, in this embodiment, two of the four amplifiers provided in the main unit 20 are used. In this embodiment, a dual coil woofer is used to output the low frequency component of the R signal input from the amplifier 21R and the low frequency component of the L signal input from the amplifier 21L using a single woofer. It was decided to.

  The R tweeter 12 is an R signal tweeter that reproduces the high frequency range component of the R signal output from the amplifier 21R. Specifically, the R tweeter 12 includes a capacitor 12a that cuts the low frequency range component of the R signal output from the amplifier 21R, and the R signal (that is, the R signal) from which the low frequency range component has been cut by the capacitor 12a. Of the high frequency range).

  The L tweeter 13 is an L signal tweeter that reproduces the high frequency range component of the L signal output from the amplifier 21L. Specifically, like the R tweeter 12, the L tweeter 13 includes a capacitor 13a that cuts the low frequency range component of the L signal output from the amplifier 21L, and the low frequency range component is cut by the capacitor 13a. The signal (that is, the high frequency component of the L signal) is reproduced.

  Note that when only one speaker unit 10 is installed on the vehicle, the amplifiers 22R and 22L of the main unit 20 are not necessary, so that the main unit from which these amplifiers 22R and 22L are deleted is mounted on the vehicle. Also good.

  Next, an example of a specific configuration of the speaker unit 10 will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of a specific configuration of the speaker unit 10.

  As shown in FIG. 3, the woofer 11 is loosely inserted between the magnetic circuit unit 11c, the frame 11d fixed to the magnetic circuit unit 11c, the top plate 11c-1 and the center pole 11c-2 of the magnetic circuit unit 11c. The cylindrical voice coil bobbin 11e, the R voice coil 11a and the L voice coil 11b wound around the voice coil bobbin 11e, the cone-shaped diaphragm 11f joined to the voice coil bobbin 11e, and the voice coil bobbin 11e are elastically coupled. It is mainly comprised by the damper 11g to support.

  The magnetic circuit portion 11c is provided between a disc-shaped top plate 11c-1 having an opening in the center, a yoke 11c-3 including a center pole 11c-2, and the yoke 11c-3 and the top plate 11c-1. And an annular magnet 11c-4. Here, a predetermined space (magnetic gap) is formed between the top plate 11c-1 and the center pole 11c-2, and the R voice coil 11a and the L voice wound around the voice coil bobbin 11e are formed in this space. The coil 11b is accommodated.

  The R voice coil 11a is electrically connected to the amplifier 21R via a lead wire 11h, and is a member that converts an R signal output from the amplifier 21R into vibration. Similarly, the L voice coil 11b is electrically connected to the amplifier 21L via the lead wire 11i, and is a member that converts the L signal output from the amplifier 21L into vibration.

  Specifically, when an R signal and an L signal are respectively input to the R voice coil 11a and the L voice coil 11b, an electromagnetic force is applied, and the R voice coil 11a and the L voice coil 11b are moved by the electromagnetic force to the voice coil bobbin 11e. And vibrate together.

  The diaphragm 11f is joined to the voice coil bobbin 11e, and is integrated with the R voice coil 11a and the L voice coil 11b via the voice coil bobbin 11e. The diaphragm 11f is elastically fixed to the frame 11d via the edge portion 11j. Thereby, in the woofer 11, the diaphragm 11f vibrates with the vibrations of the R voice coil 11a and the L voice coil 11b, so that a synthesized sound of the R signal and the L signal is output.

  The damper 11g is a disk-like elastic member in which concave portions and convex portions are alternately formed, and elastically supports the voice coil bobbin 11e that vibrates with the vibration of the R voice coil 11a and the L voice coil 11b. Playing a role.

  On the other hand, the R tweeter 12 and the L tweeter 13 are provided at substantially the center of the output surface of the woofer 11. In the speaker unit 10, the R tweeter 12 and the L tweeter 13 are attached so that the output surface 12 b of the R tweeter 12 and the output surface 13 b of the L tweeter 13 form a predetermined angle. And the output sound from the L tweeter 13 are separated as much as possible.

  When the speaker unit 10 is installed in the passenger compartment, the speaker unit 10 is installed in a direction in which the R tweeter 12 and the L tweeter 13 are arranged on the left and right when viewed from the listener. Specifically, the speaker unit 10 outputs the R side sound from the R tweeter 12 toward the right ear side of the listener, and outputs the L side sound from the L tweeter 13 toward the left ear side of the listener. It is installed in the direction as

  Below, the example of arrangement | positioning of R tweeter 12 and L tweeter 13 is demonstrated using FIG. 4 with the example of arrangement | positioning to the compartment of the speaker unit 10. FIG. FIG. 4 is a diagram illustrating an arrangement example of the speaker unit 10. In addition, (A) of the figure shows an arrangement example of the R tweeter 12 and L tweeter 13, and (B) of the figure shows an arrangement example of the speaker unit 10, respectively.

  As shown to (A) of the figure, when using as a speaker for 1 person, the speaker unit 10 is installed in front of a listener's seating position. In the R tweeter 12 and the L tweeter 13, the angle formed by the output surface 12 b of the R tweeter 12 and the output surface 13 b of the L tweeter 13 is 180 degrees as viewed from the direction of gravity, as shown in FIG. It is attached to be larger.

  That is, in the speaker unit 10, when installed in the vehicle, the R tweeter 12 outputs R-side sound toward the right ear side of the listener from the front direction of the speaker unit 10, and the L tweeter 13 is The L-side sound is output from the front direction of the unit 10 toward the listener's left ear.

  As a result, the R-side sound reproduced by the R tweeter 12 can easily reach the listener's right ear, and the L-side sound reproduced by the L tweeter 13 can easily reach the listener's left ear. Therefore, even when the R tweeter 12 and the L tweeter 13 are arranged close to each other in the unit, it is possible to suppress a reduction in the acoustic effect due to the mixing of the R side sound and the L side sound.

  In addition, as shown to (B) of the figure, when installing the speaker unit 10 for drivers | operators, it is good also as providing in instrument panels, such as meters, operation switches, etc. which are arrange | positioned ( (See (B-1) in the figure). Moreover, what is necessary is just to install in the dashboard ahead of a passenger seat, when installing the speaker unit 10 in a passenger seat.

  In addition, the speaker unit 10 may be arranged on the upper part of the dashboard (including the instrument panel), and the output sound from the speaker unit 10 may be reflected on the windshield of the vehicle to be heard by the listener (same figure). (See (B-2)).

  Further, when there is a space between the windshield and the dashboard, the speaker unit 10 may be disposed in the space (see (B-3) in the figure). In such a case, similarly to the case shown in (B-2) of the same figure, the output sound from the speaker unit 10 is reflected on the windshield to be heard by the listener.

  In the speaker unit 10, the R tweeter 12 is positioned on the right ear side of the listener from the median plane of the listener properly seated on the seat, as shown in FIG. However, it is preferable to arrange it so that it is located on the left ear side of the listener from the median plane.

  By the way, until now, the R tweeter 12 and the L tweeter 13 are attached at a predetermined angle so that the R side sound can easily reach the listener's right ear and the L side sound can easily reach the listener's left ear. However, the method of separating the R-side sound and the L-side sound is not limited to this.

  Hereinafter, another method for separating the R-side sound and the L-side sound will be described with reference to FIG. FIG. 5 is a diagram illustrating another configuration example of the speaker unit 10.

  For example, as shown in FIG. 5A, the R tweeter 12 and the L tweeter 13 may be arranged as far apart as possible in the speaker unit 10. Specifically, the R tweeter 12 and the L tweeter 13 are respectively provided at the left and right ends of the woofer 11 as viewed from the listener.

  As a result, when the speaker unit 10 is installed in front of the listener, the R-side sound is output from the right ear side of the listener's midline, and the L-side sound is output from the left ear side of the midline of the listener. As a result, the R-side sound can easily reach the right ear of the listener, and the L-side sound can easily reach the left ear of the listener.

  Thus, by disposing the R tweeter 12 and the L tweeter 13 as far as possible in the unit, it is possible to suppress a decrease in acoustic effect due to the mixing of the R side sound and the L side sound.

  Further, as shown in FIG. 5B, acoustic lenses 14R and 14L may be attached to the R tweeter 12 and the L tweeter 13, respectively. Here, the acoustic lenses 14 </ b> R and 14 </ b> L are restriction members configured by a plurality of blades arranged in parallel with each other at a predetermined interval. That is, the acoustic lens 14R plays a role of restricting the output direction of the R-side sound in a direction away from the output direction of the L-side sound, and the acoustic lens 14L keeps the output direction of the L-side sound away from the output direction of the R-side sound. Plays a role in regulating the direction.

  Specifically, the acoustic lens 14R bends the output direction of the R side sound output from the R tweeter 12 to the right ear side of the listener, and the acoustic lens 14L is configured to output the L side sound output from the L tweeter 13. The output direction is bent toward the listener's left ear.

  As a result, the R-side sound and the L-side sound are further separated, so that it is possible to further suppress the deterioration of the acoustic effect due to the mixing of the R-side sound and the L-side sound.

  Further, as shown in FIG. 5C, horns 15R and 15L may be attached to the R tweeter 12 and the L tweeter 13 in place of the acoustic lenses 14R and 14L.

  Here, the horn 15R is a regulating member that regulates the output direction of the R side sound output from the R tweeter 12 to the right ear side of the listener, and the horn 15L is the L side sound output from the L tweeter 13. It is a regulating member that regulates the output direction to the listener's left ear side. By attaching the horns 15R and 15L, the same effects as those of the acoustic lenses 14R and 14L can be obtained.

  When the horns 15R and 15L are attached, in order to prevent the depth of the speaker unit 10 from increasing, the R tweeter 12 and the L tweeter 13 are provided behind the output surface of the woofer 11, and the horns 15R and 15L are provided. It is preferable to secure an installation space.

  Here, although the acoustic lens and the horn are provided in both the R tweeter 12 and the L tweeter 13, the acoustic lens and the horn may be provided only in one of the R tweeter 12 and the L tweeter 13.

  Here, the R tweeter 12 and the L tweeter 13 are attached so that the output surface faces the listener, but as shown in FIG. 4, the R tweeter 12 and the L tweeter 13 are attached at a predetermined angle. In addition, the acoustic lenses 14R and 14L and the horns 15R and 15L may be further attached to the R tweeter 12 and the L tweeter 13. In this way, the R side signal and the L side signal can be more reliably separated.

  Further, as another method for separating the R side signal and the L side signal, for example, a partition plate may be provided between the R tweeter 12 and the L tweeter 13.

  As described above, in this embodiment, the speaker unit 10 uses the R voice coil (first voice coil) and the L voice coil (second voice coil) to generate the low frequency range component of the R signal and the L signal. A woofer that reproduces the low frequency range component, an R tweeter that reproduces the high frequency range component of the R signal, and an L tweeter that reproduces the high frequency range component of the L signal are provided. Therefore, an appropriate acoustic effect can be obtained while reducing the installation space.

  In this embodiment, the R tweeter and the L tweeter are attached at a predetermined angle, the R tweeter and the L tweeter are installed as far as possible in the unit, or an acoustic lens and a horn are attached to the R tweeter and the L tweeter. As a result, it is possible to suppress a reduction in acoustic effect caused by integrating the R tweeter and the L tweeter integrally.

  In the above-described embodiments, the case where the speaker unit 10 is used as a speaker unit for one person has been described. However, depending on the installation position, the speaker unit 10 can be used as a speaker unit for two persons.

  Below, the example of arrangement | positioning in the case of using the speaker unit 10 as a speaker unit for 2 persons is demonstrated using FIG. FIG. 6 is a diagram illustrating another arrangement example of the speaker units. 1A shows a case where one speaker unit 10 is installed on the vehicle 100, and FIG. 1B shows a case where two speaker units 10 are installed on the vehicle 100. Respectively.

  As shown to (A) of the figure, when using for two persons, the speaker unit 10 should just be provided in the position on the centerline of the vehicle 100, or the vicinity of the said position. For example, when the speaker unit 10 is installed as a speaker unit for the listener A seated in the driver seat and the listener B seated in the passenger seat, the speaker unit 10 is located at or near the position where the dashboard and the center line of the vehicle 100 intersect. Should be provided.

  Here, the direct sound S1 of the R side sound output from the R tweeter 12 is output toward the right ear of the listener A, and the reflected sound S2 of the R side sound reflected by the side glass is input to the right ear of the listener B. By arranging the R tweeter 12 so as to be output toward the user, the R side sound can be appropriately heard from the listener A and the listener B.

  Similarly, the direct sound S3 of the L side sound output from the L tweeter 13 is output toward the left ear of the listener B, and the reflected sound S4 of the L side sound reflected by the side glass is input to the right ear of the listener A. By arranging the L tweeter 13 so as to be output toward the head, the L side sound can be appropriately heard from the listener A and the listener B.

  In addition to the front seat speaker unit 10F, the rear seat speaker unit 10R may be provided in the vehicle 100 as shown in FIG. 6B. In such a case, the speaker unit 10R for the rear seat may be provided, for example, at a position that intersects the center line of the vehicle 100 above the rear tray or in the vicinity of the position.

  Similarly to the front seat speaker unit 10F, the direct sound S5 of the R side sound is directed to the right ear of the listener C, the reflected sound S6 of the R side sound is directly directed to the right ear of the listener D, and the direct sound of the L side sound is obtained. By arranging the R tweeter 12 and the L tweeter 13 so that the sound S7 is output toward the left ear of the listener D and the reflected sound S8 of the L side sound is output toward the left ear of the listener C, the listener C and R-side sound and L-side sound can be appropriately heard from the listener D.

  The rear-seat speaker unit 10R may be connected to the amplifier 22R and the amplifier 22L of the main unit 20 shown in FIG.

  In the above-described embodiments, the case where the R signal and the L signal are acquired using two of the four amplifiers provided in the main unit 20 is described. However, the present invention is not limited to this. All four amplifiers may be used. Below, the structural example of the speaker unit 10 in such a case is demonstrated using FIG. FIG. 7 is a diagram illustrating another configuration of the speaker unit 10.

  As shown in FIG. 7, the speaker unit 10 may be configured such that the woofer 11 is connected to the amplifier 21R and the amplifier 21L, the R tweeter 12 is connected to the amplifier 22R, and the L tweeter 13 is connected to the amplifier 22L. . As described above, the speaker unit 10 includes four input terminals, so that input systems to the woofer 11, the R tweeter 12, and the L tweeter 13 can be configured separately.

  As described above, the speaker unit according to the present invention is useful when it is desired to obtain an appropriate acoustic effect while suppressing installation space, and is particularly suitable for application to a small vehicle in which it is difficult to install a large number of woofer speakers. ing.

DESCRIPTION OF SYMBOLS 10 Speaker unit 11 Woofer 11a R voice coil 11b L voice coil 11c Magnetic circuit part 11c-1 Top plate 11c-2 Center pole 11c-3 Yoke 11c-4 Magnet 11d Frame 11e Voice coil bobbin 11f Diaphragm 11g Damper 11h, 11i Lead wire 11j Edge portion 12 R Tweeter 12a Capacitor 12b Output surface 13 L Tweeter 13a Capacitor 13b Output surface 20 Main unit 21R, 22R Amplifier (for R signal)
21L, 22L amplifier (for L signal)
14R, 14L Acoustic lens 15R, 15L Horn 100 Vehicle

Claims (6)

A speaker unit in which a plurality of speakers are integrated,
Using a first voice coil and a second voice coil to reproduce the low frequency component of the right channel signal and the low frequency component of the left channel signal;
A right channel tweeter that reproduces the high frequency range component of the right channel signal;
A speaker unit comprising: a left channel tweeter that reproduces a high-frequency component of the left channel signal. The right channel tweeter and the left channel tweeter are:
The speaker unit according to claim 1, wherein the speaker unit is attached so that an angle between the output surfaces is greater than 180 degrees. Restricting means for restricting one of the output direction of the sound reproduced by the right channel tweeter or the output direction of the sound reproduced by the left channel tweeter to a direction away from the other output direction. The speaker unit according to claim 1 or 2, wherein The left channel tweeter and the right channel tweeter are:
4. The speaker unit according to claim 1, wherein the speaker unit is provided at each of right and left ends of the woofer as viewed from a listener.   The speaker unit according to any one of claims 1 to 4, wherein the speaker unit is provided in a passenger compartment of a vehicle and is provided in front of a seating position of a listener.   The speaker unit according to any one of claims 1 to 4, wherein the speaker unit is provided in a vehicle interior of a vehicle and is provided at a position on a center line of the vehicle or in the vicinity of the position.

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