JP5150337B2 - Vehicle anti-theft device - Google Patents

Description

  The present invention relates to an improvement in a vehicle antitheft device.

When the vehicle is stopped, if the ignition switch is turned with a key other than the proper key or the handle lock device is forcibly unlocked, vibration is applied to the vehicle body. An antitheft device that rings is known (for example, see Patent Document 1).
JP 2006-306136 A

1 and 2 of Patent Document 1 will be described below.
A handle lock module 14 is disposed on the console in the front cover of the scooter type vehicle.

  The handle lock module 14 includes a vibration sensor 50 that detects vibration, an ECU 18 that receives a signal from the vibration sensor 50, a main switch 22, and a handle lock mechanism 24. A buzzer 34 disposed in the front cover is connected to the ECU 18 via a conducting wire.

  When vibration is applied to the handle lock module 14, this vibration is detected by the vibration sensor 50, and a detection signal is sent from the vibration sensor 50 to the ECU 18. The ECU 18 sends a control signal to the buzzer 34 based on this detection signal. As a result, a warning sound is emitted from the buzzer 34.

  The buzzer 34 is actuated by a control signal from the ECU 18 provided in the handle lock module 14. For example, if the operation of the buzzer 34 can be controlled using a control unit provided in an existing device mounted on the vehicle body, the theft prevention There is no need to provide a special control for the device.

In addition, since the buzzer 34 is provided separately from the handle lock module 14, parts for mounting the handle lock module 14 and the buzzer 34 on the vehicle body side, and a long lead wire for connecting the handle lock module 14 and the buzzer 34. Is required.
Further, since the buzzer 34 is an electrical component, a cover and a seal structure are specially required to prevent the influence of rainwater, dirt, etc., resulting in an increase in cost.

  The buzzer 34 is arranged in the front cover. Depending on the position of the buzzer 34, it may be difficult for the alarm sound to reach the outside of the front cover. The buzzer 34 is as close to the ignition switch and handle lock device as possible around the handle and console. It must be placed in a position where alarm sounds are easily reachable.

  An object of the present invention is to provide a vehicle antitheft device that can reduce the cost by diverting other body equipment and reducing the number of parts while making it easy to reach an alarm sound around the steering wheel and console. .

The invention according to claim 1 is a display unit that displays a vehicle speed, an engine state, and the like of a vehicle, a substrate on which a control unit that controls the display unit is mounted, a meter that includes a display unit and a case that stores the substrate, In a vehicle including an acceleration sensor that detects vibration and an antitheft device having a buzzer that issues a warning based on a signal from the acceleration sensor, the control unit operates the buzzer based on a signal from the acceleration sensor, Is mounted on the board, and a hole is formed in the case so that the buzzer faces the outside, and a loudspeaker is formed around the hole, and the inner diameter of the loudspeaker increases exponentially with increasing distance from the buzzer. It is formed in a bell mouth shape .

  As an effect, the buzzer is mounted on the board housed in the meter case and a hole is made in the case to expose the buzzer to the outside, so that the alarm sound from the buzzer can easily reach the handle and console near the meter. Become.

Since the control unit of the antitheft device uses the control unit that controls the display unit of the meter, the cost increase can be suppressed.
Since the buzzer is mounted on the substrate housed in the case, it is not necessary to connect the control unit and the buzzer with a conductive wire, and the influence of rainwater, dust, or the like is reduced.
Further, the buzzer sound transmitted to the periphery of the hole through the hole of the case is increased by the loudspeaker. On the other hand, even if the buzzer is downsized by providing the loudspeaker, a constant sound volume is ensured in a predetermined direction.
Furthermore, since the loudspeaker is formed in a bell mouth shape whose inner diameter increases exponentially as the distance from the buzzer increases, the sound of the buzzer is effectively increased in the loudspeaker.

The invention according to claim 2 is characterized in that a seal member is provided between the buzzer and the case around the hole.
As an effect, the seal member prevents a rainwater, dust, or the like from entering through the hole even though the hole faces the buzzer and the sound easily comes out of the case.

Inventions described in claim 3 is characterized in that a buzzer inside the case.
As an action, vibration generated in the buzzer when the buzzer issues an alarm is suppressed by the rib provided in the case.

The invention according to claim 4 is characterized in that a swash plate is provided outside the hole.
As an effect, the swash plate makes it difficult for rainwater, dust and the like to enter from the hole, and the sound of the buzzer is transmitted to the outside without being blocked. Further, the swash plate can give directivity to the sound of the buzzer and change the direction of transmission.

The invention according to claim 5 is characterized in that the acceleration sensor is mounted on a substrate.
As an effect, a conducting wire for connecting the acceleration sensor and the control unit is not necessary.

According to a sixth aspect of the present invention, the meter includes a control unit that controls generation of a buzzer warning sound and a buzzer drive circuit.
As an effect, the meter has both a control unit for controlling the generation of a buzzer warning sound and a drive circuit for the buzzer, so that the components of the antitheft device are concentrated in one place, and the antitheft device becomes small. .

In the invention according to claim 1, the control unit operates the buzzer based on the signal from the acceleration sensor, mounts the buzzer on the substrate, and opens a hole in the case to expose the buzzer to the outside. A sufficiently loud alarm sound can reach the handle and console near the meter through the hole, and the buzzer operates by diverting the control unit that controls the display unit while ensuring such a large alarm sound. In addition, a lead wire for connecting the control unit and the buzzer and a cover member that specifically covers the buzzer are not required, and the cost of the anti-theft device can be reduced.
Further, in the present invention, since the loudspeaker is formed around the hole of the case, the sound of the buzzer can be increased by the loudspeaker, and the antitheft effect can be improved and the buzzer can be downsized.
Furthermore, in the present invention, since the loudspeaker is formed in a bell mouth shape in which the inner diameter increases exponentially with increasing distance from the buzzer, the sound of the buzzer can be effectively increased at the loudspeaker, and more The antitheft effect can be further improved and the buzzer can be downsized.

  In the invention according to claim 2, since the seal member is provided between the buzzer and the case around the hole, the seal member can prevent rainwater, dust, and the like from entering the case from the hole.

In the invention which concerns on Claim 3, since the buzzer was arrange | positioned in a case, it can suppress that a buzzer vibrates excessively by a rib.

In the invention according to claim 4 , since the swash plate is provided outside the hole, the swash plate can prevent rainwater, dust, and the like from entering the hole without blocking the sound of the buzzer. Furthermore, the buzzer sound can be given directivity, and the buzzer sound can be transmitted in a desired direction.

In the invention according to claim 5 , since the acceleration sensor is mounted on the substrate, a lead wire for connecting the acceleration sensor and a control unit to which a signal from the acceleration sensor is input, or a component for mounting the acceleration sensor to other than the substrate Is eliminated, and the cost of the anti-theft device can be further reduced.

In the invention according to claim 6 , since the control unit for controlling the generation of the warning sound of the buzzer and the drive circuit for the buzzer are built in the meter, the components of the antitheft device can be concentrated at one place, and theft The prevention device can be reduced in size.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a vehicle equipped with an anti-theft device according to the present invention. A vehicle 10 has a front part of a vehicle body, a handle cover 11, and a lower part of the handle cover 11, and a driver's legs. A front fork 17 is covered with a front cover 12 serving as a leg shield covering the front and a front inner cover 13 disposed behind the front cover 12, and a head pipe 16 provided at the front end of the body frame 14. The front fork 17 is attached to the upper end of the front fork 17, the front wheel 22 is attached to the lower end of the front fork 17, the engine 23 is attached to the middle part of the body frame 14, and the lower rear part of the body frame 14 is attached. A swing arm 24 is supported so as to be swingable up and down, and a rear wheel 25 is provided at a rear end portion of the swing arm 24. Attached, a motorcycle mounted with a pair of left and right rear cushion units 26, 26 (only the reference numeral 26 on the near side.) Is passed to the upper rear portion of the rear and the body frame 14 of the swing arm 24.

A meter 27 is attached to the upper part of the handle cover 11, and a key cylinder 28 as a main switch is attached to the upper part of the front inner cover 13.
The vehicle 10 is provided with a handle lock device (not shown) for preventing theft so that the bar handle 21 is not rotated while the vehicle is stopped.

  In the figure, 31 is a seat, 32 is a fuel tank, 33 is a driver's step, 34 is a side stand, 35 is a main stand, 36 is a passenger's step, 37 is a rear sprocket, and 38 is a chain.

FIG. 2 is a front view (reference example) of a meter provided in the vehicle according to the present invention. The meter 27 is a display unit 41 for displaying information such as the vehicle speed, the gear position of the transmission, the state of the lighting device, and the remaining amount of fuel. Is provided.
The display unit 41 includes a speedometer 43, a fuel remaining amount meter 44, and various indicators 45 to 49 arranged in the center. Reference numerals 51 and 52 denote attachment portions for attaching the meter 27 to the handle cover 11 (see FIG. 1).

3A and 3B are explanatory diagrams (reference examples) of the meter according to the present invention.
2A is a cross-sectional view taken along line 3-3 in FIG. 2. The meter 27 includes a meter case 57 including a lower case 55 and an upper case 56, a substrate 58 attached to the lower case 55, and a front side of the substrate 58. An inner cover 61 that covers the inner cover 61, a display plate 62 that is disposed outside the inner cover 61, and an outer cover 63 that covers the outer periphery of the display plate 62 and is disposed inside the upper case 56.

The lower case 55 includes a through hole 55a that penetrates the inside of the meter 27, and a buzzer 74 attached to the substrate 58 is disposed inside the through hole 55a. That is, the buzzer 74 faces the outside of the lower case 55 through the through hole 55a.
The upper case 56 is made of a transparent resin that covers the display unit 41.

  The substrate 58 includes a drive unit 65 of the speedometer 43, electronic components 66 and 67 related to display on the display unit 41, a control unit 71 that controls display on the display unit 41, a drive unit 65, electronic components 66 and 67, and A female coupler 72 to which a male coupler (not shown) for supplying various signals and electric power from the outside is connected to the control unit 71, a substrate 58, a meter 27, and an acceleration sensor 73 for detecting vibration of the vehicle body, A buzzer 74 that generates an alarm sound when vibration of the vehicle body is detected by the acceleration sensor 73 is mounted.

The drive unit 65 includes a drive unit body 76 attached to the back side surface of the substrate 58 and a pointer 77 disposed on the front side of the substrate 58 and driven by the drive unit body 76.
The electronic components 66 and 67 are attached to the front side of the substrate 58 and covered with the inner cover 61.

  The control unit 71 is attached to the front side of the substrate 58 and controls the display of the display unit 41. The control unit 71 is a component that constitutes the anti-theft device 81 together with the acceleration sensor 73 and the buzzer 74, and is based on the detection signal of the acceleration sensor 73. It is also a part that controls the alarm sound generation of the buzzer 74. That is, the antitheft device 81 is also controlled by diverting the control unit 71 that controls the display of the display unit 41.

  The anti-theft device 81 detects the vibration when the key cylinder 28 (see FIG. 1), the handle lock device, etc. are tampered with when the vehicle is stopped, and the control unit 81 warns the buzzer 74. It generates sound.

  The female coupler 72 is attached to the rear surface of the substrate 58, and a coupler insertion hole 55b is formed in the lower case 55 so as to avoid the female coupler 72. Although there is a gap between the female coupler 72 and the coupler insertion hole 55b, a rubber boot (not shown) that fits into a seal groove 55d provided in the lower case 55 is attached to the male coupler side. When the male coupler is connected to 72, the rubber boots prevent rainwater, dirt and the like from entering the meter case 57.

  The acceleration sensor 73 and the buzzer 74 are attached to the back surface of the substrate 58, a rib 55c is formed in the lower case 55 so as to surround the buzzer 74, and a through hole 55a is formed inside the rib 55c. As described above, the acceleration sensor 73 and the buzzer 74 are attached to the substrate 58 together with the control unit 71, thereby eliminating the need for conducting wires for connecting the acceleration sensor 73 and the buzzer 74 and the control unit 71, thereby reducing the number of components. Thus, the cost of the anti-theft device 81 can be reduced.

  Reference numeral 83 in the drawing is a seal member provided between the lower case 55 and the buzzer 74 around the through hole 55a, and constitutes one part of the meter 27. It prevents rainwater and dirt from entering the inside.

  (B) is a cross-sectional view taken along the line bb of (a). The outer shape of the buzzer 74 is circular, and a cylindrical rib 55c is formed integrally with the lower case 55 so as to surround the circular buzzer 74. A ring-shaped seal member 83 is disposed so as to surround the circular through hole 55a.

Reference sign C1 in the figure is a clearance between the buzzer 74 and the rib 55c.
Thus, by surrounding the buzzer 74 with the rib 55c with the clearance C1, the rib 55c can prevent the buzzer 74 from vibrating excessively in the radial direction, and the buzzer 74 can be assembled to the substrate 58. The attachment error can be absorbed by the clearance C1, and the assembling property of the substrate 58 to which the buzzer 74 is attached to the lower case 55 can be improved.

  FIG. 4 is a block diagram of a meter board provided in a vehicle according to the present invention. On the board 58, a meter display device 86 for displaying the meter 27 and an antitheft device 81 are mounted.

The meter display device 86 includes electronic components 66 and 67, a control unit 71, and a receiver 91 connected to the control unit 71.
The receiver 91 receives radio waves emitted from a smart key as a transmitter that locks or unlocks the handle lock device wirelessly.
The electronic component 67 is a power unit that supplies power to the electronic component 66 and the control unit 71.

The control flow of the antitheft device 81 described above will be described next.
FIG. 5 is a flowchart showing control by the control unit of the anti-theft device according to the present invention. STXX in the figure indicates a step number.
ST01 ... It is determined whether or not the key cylinder, that is, the main switch is off.
If the main switch is on (NO), the process proceeds to ST01 again.
If the main switch is off (YES), the process proceeds to ST02.
ST02 ... The alarm mode is entered, and a detection signal is input from the acceleration sensor to the control unit.

ST03 ... It is determined whether the acceleration detection value A is larger than the acceleration determination value Ajdt (A> Ajdt?).
If A ≦ Ajdt (NO), the process proceeds to ST03 again.
If A> Ajdt (YES), the process proceeds to ST04.
ST04 ... A warning sound is emitted from the buzzer.

  As shown in FIGS. 1, 3 (a), and 3 (b), the present invention includes a display unit 41 that displays the vehicle speed and engine state of the vehicle 10, and a control unit 71 that controls the display unit 41. An alarm is issued based on the mounted substrate 58, the display unit 41, a meter 27 including a meter case 57 as a case for housing the substrate 58, an acceleration sensor 73 for detecting vibration of the vehicle body, and a signal from the acceleration sensor 73. In the vehicle 10 including the antitheft device 81 having the buzzer 74, the control unit 71 operates the buzzer 74 based on the signal from the acceleration sensor 73, mounts the buzzer 74 on the substrate 58, and installs the buzzer 74 on the meter case 57. Since the through hole 55a is formed as a hole through which the 73 faces the outside, a sufficiently loud alarm sound is generated by the through hole 55a formed in the meter case 57. It is possible to reach around the bar handle 26 and the console nearby, and to control the operation of the buzzer 74 by diverting the control unit 71 that controls the display unit 41 while ensuring such a loud alarm sound. In addition, a lead wire for connecting the control unit 71 and the buzzer 74 and a special cover member that covers the buzzer 74 are not required, and the cost of the antitheft device 81 can be reduced.

  Further, in the present invention, since the seal member 83 is provided between the buzzer 74 and the meter case 57 around the through hole 55a, rainwater, dust, etc. enter the meter case 57 from the through hole 55a by the seal member 83. Can be prevented.

  Further, in the present invention, since the meter case 57 is provided with the rib 55c so as to surround the buzzer 74 and the buzzer 74 is disposed in the meter case 57, the rib 55c can suppress the buzzer 74 from excessively vibrating.

  Furthermore, according to the present invention, since the acceleration sensor 73 is mounted on the substrate 58, a conductive wire connecting the acceleration sensor 73 and the control unit 71 to which a signal from the acceleration sensor 73 is input, or the acceleration sensor 73 is mounted on the substrate 58. In addition to this, parts for mounting are unnecessary, and the cost of the anti-theft device 81 can be further reduced.

6A and 6B are explanatory diagrams (reference examples) of the meter according to the present invention. The same components as those in the reference example shown in FIG.
(A) is sectional drawing, and the meter 101 seals between the meter case 57, the board | substrate 58, the inner cover 61, the display board 62, the outer cover 63, the rib 55c of the lower case 55, and the buzzer 74, respectively. And a sealing member 102.

  (B) is a sectional view taken along the line bb of (a), and the seal member 102 is disposed so as to fill the gap 103 between the outer peripheral surface of the circular buzzer 74 and the inner peripheral surface of the cylindrical rib 55c. ing. Reference C2 is a clearance between the buzzer 74 and the rib 55c.

  Thus, by interposing the seal member 102 between the buzzer 74 and the rib 55c, excessively large vibrations in the radial direction of the buzzer 74 can be attenuated by the elastic force and hysteresis of the seal member 102.

FIGS. 7A and 7B are explanatory diagrams (reference examples) of the meter according to the present invention. The same reference numerals are given to the same components as those in the reference example shown in FIG.
(A) is a cross-sectional view, and the meter 111 includes a meter case 113 including a lower case 112 and an upper case 56, a substrate 114 attached to the lower case 112, and an inner cover 116 that covers a part of the front side of the substrate 114. The display plate 62 and the outer cover 63 are included.

The lower case 112 includes a coupler insertion hole 112 b provided so as to avoid the female coupler 72 and a buzzer insertion hole 112 c provided for attaching the buzzer 118.
The buzzer 118 is attached to the lower case 112 with screws 121 and 121 so as to be inserted into the buzzer insertion hole 112c and face the outside.

The board 114 has a connector 126 to which a drive unit 65, electronic components 66 and 67, a control unit 71, a female coupler 72, an acceleration sensor 73, and two conductive wires 123 and 124 extending from a buzzer 118 are connected. Terminal pins 127 and 128 that are detachably connected are mounted.
The control unit 71, the acceleration sensor 73, and the buzzer 118 are components that constitute the anti-theft device 130.

  (B) is a cross-sectional view taken along the line bb of (a), and the buzzer 118 includes a buzzer main body 131 and a pair of buzzer side mounting portions 133 and 134 formed integrally with the case 132 of the buzzer main body 131. These buzzer side attachment portions 133 and 134 are attached to the lower case 112 with screws 121 and 121.

FIGS. 8A and 8B are explanatory diagrams (reference examples) of the meter according to the present invention.
(A) is sectional drawing, The meter 150 is provided with the meter case 153 which consists of the lower case 151 and the upper case 152, and the board | substrate 154 attached to the lower case 151. FIG.

The lower case 151 includes a through hole 151a penetrating the inside and outside of the meter 150, and a buzzer 161 attached to the substrate 154 is disposed inside the through hole 151a. Reference numeral 162 denotes a breathable seal member that prevents the buzzer 161 from being covered with rainwater, dirt, or the like through the through hole 151a.
The upper case 152 is made of a transparent resin.

  The board 154 includes a drive unit 165 of the speedometer 164, a plurality of electronic components 166 (only one is shown in the figure), a buzzer 161, an alarm circuit 168 that forms the antitheft device 170 together with the buzzer 161, and these And a female coupler 172 to which a male coupler (not shown) for supplying various signals and power from the outside is connected to the driving unit 165, the electronic component 166, the buzzer 161, and the alarm circuit 168.

  The drive unit 165 includes a drive unit main body 176 attached to the back surface of the substrate 154 and a pointer 177 disposed on the front side of the substrate 154 and driven by the drive unit main body 176.

  The anti-theft device 170 detects the vibration when the key cylinder 28 (see FIG. 1), the handle lock device, etc. are tampered with when the vehicle is stopped, and the alarm circuit 168 alerts the buzzer 161. It generates sound.

  The female coupler 172 is attached to the rear surface of the substrate 154, and a coupler insertion hole 151b is formed in the lower case 151 so as to avoid the female coupler 172. There is a gap between the female coupler 172 and the coupler insertion hole 151b. On the male coupler side, a rubber boot (not shown) that fits in the annular convex portion 151d provided on the lower case 151 is attached to the female coupler. When the male coupler is connected to the coupler 172, the rubber boot prevents rainwater, dirt, etc. from entering the meter case 153.

  As described above, the buzzer 161 is attached to the board 154 together with the alarm circuit 168, so that a lead wire for connecting the buzzer 161 and the alarm circuit 168 becomes unnecessary, the number of parts can be reduced, and the antitheft device. The cost of 170 can be reduced.

  (B) is a bottom view of the meter 150 and shows that an alarm circuit 168 and a buzzer 161 are arranged side by side in the vehicle width direction (left-right direction in the figure) on the side of the female coupler 172. .

FIG. 9 is a block diagram of an alarm circuit according to the present invention . The alarm circuit 168 includes a theft detection means 181 such as an acceleration sensor and a main switch input circuit 182 that receives switch information (ON information or OFF information) from the main switch. And a theft determination means 183 for receiving a detection signal from the theft detection means 181 and switch information from the main switch input circuit 182 to determine whether a theft has occurred, and a theft determination means connected to the buzzer 161 When it is determined by 183 that the theft has occurred, the buzzer drive circuit 184 that drives the buzzer 161 in response to the drive signal from the theft determination means 183 and the theft determination means 183 that the theft has occurred. When the determination is made, the indicator drive signal output from the theft determination means 183 is received. The alarm mode is set (the set button is pressed) or released (the unset button is pressed) by the indicator driving circuit 186 that lights or blinks the indicator and the transmitter 188 that is carried by the vehicle owner and the main switch is OFF. An RF receiver circuit 192 (RF: radio frequency) that receives a signal transmitted when the operation of the received state) is performed via the antenna 191 and sends an alarm mode setting signal or an alarm mode release signal to the theft determination means 183 ) And a power supply circuit 193 for supplying power to the theft detection means 181 and the theft determination means 183.

FIG. 10 is a cross-sectional view of a meter according to the present invention . The same reference numerals are given to the same components as those in the reference example shown in FIG.
The meter 200 includes a meter case 203 including a lower case 201 and an upper case 152, and a substrate 154 attached to the lower case 201.
In the lower case 201, a horn 201a as a loudspeaker is integrally formed so as to be positioned below the buzzer 161.

  The horn 201a is a loudspeaker whose cross section is formed in an exponential curve shape (that is, a bell mouth shape) from the inlet opening 201b provided on the buzzer 161 side to the outlet opening 201c, and the sound directivity of the buzzer 161 is To increase the volume in a specific direction effectively.

FIGS. 11A and 11B are explanatory views showing a horn provided in the meter according to the present invention and the surroundings of the horn, and an arrow (FRONT) in the figure indicates the front of the vehicle.
As shown in (a), a horn 201a is provided below the buzzer 161, and a plurality of swash plates 205 attached to the lower case 201 (see FIG. 10) are further provided below the horn 201a. .

  The swash plate 205 allows rainwater, dust, etc. scattered from the front or the bottom of the vehicle as indicated by arrows F and F to pass through the horn 201a or the horn 201a without blocking the sound of the buzzer 161 radiated to the outside. It is a component that prevents the buzzer 161 from being covered and further imparts directivity (directivity in the directions of arrows D and D in the figure) to the sound emitted from the horn 201a.

  (B) is a b arrow view of (a), and the horn 201a and the inlet opening 201b of the horn 201a are covered with a plurality of swash plates 205. FIG. Thereby, it is possible to prevent rainwater, dust, and the like from directly covering the horn 201a and the buzzer 161 (see (a)).

12A to 12D are explanatory views (reference examples) showing a lower case of the meter case according to the present invention.
(A) is a bottom view of the lower case 211, and a pair of left and right through holes 211b and 211b arranged in the vehicle width direction of the vehicle are opened on the bottom surface 211a of the lower case 211 so as to surround these through holes 211b and 211b. A horizontally long horn 211 c is formed integrally with the lower case 211.

  (B) is a sectional view taken along the line bb of (a), and the horn 211c includes a horn main body 211e and a bottom wall 211f that forms the bottom of the horn main body 211e, and the bottom wall 211f has a through hole 211b. A buzzer 161 is attached to the bottom wall 211f so as to face the through hole 211b.

  The horn body 211e is formed in a curved shape in which a front wall 211h close to the through hole 211b is formed in a flat shape and a rear wall 211j close to the through hole 211b is protruded inward.

  (C) is a sectional view taken along the line cc of (a), and in the central part of the horn body 211e far from the through hole 211b (see (b)), both the front wall 211h and the rear wall 211j are It is formed in a flat shape. Reference numeral 211A denotes a front wall of the lower case 211, and reference numeral 211B denotes a rear wall of the lower case 211.

  (D) is a sectional view taken along the line dd of (a). In the horn body 211e, the walls 211m and 211n on the outer side in the vehicle width direction with respect to the through hole 211d are both curved in a convex shape inward. Is formed.

  When the distance between the centers of the two buzzers 161 and 161 is λ, by setting the distance λ between the centers to a predetermined value, it is possible to prevent a decrease in sound pressure due to sound interference generated from each buzzer 161. The alarm sound can be increased as compared with the case where there is only one buzzer 161, and the antitheft effect can be improved.

FIG. 13 is a cross-sectional view (reference example) of a meter according to the present invention. The same components as those in the first embodiment shown in FIG. 3 and the third embodiment shown in FIG. Is omitted.
The meter 221 includes a meter case 223 including a lower case 222 and an upper case 56, a substrate 58 attached to the lower case 222, an inner cover 61, a display plate 62, and an outer cover 63.

  The lower case 222 includes an opening 222 a that opens to the outside, and a piezoelectric diaphragm 225 as a buzzer is attached to a ring-shaped rib 222 b that forms the opening 222 a by a resin case member 226.

  The piezoelectric diaphragm 225 is connected to the two conductive wires 123 and 124, specifically, is applied to the lower end of the rib 222 b of the lower case 222, and is formed on the case member 226 via a rubber 227 having an annular shape and an L-shaped cross section. The piezoelectric plate 225 is attached to the lower case 222 by being pressed by the annular step 226 a and the case member 226 is fixed to the lower case 222 with a plurality of tapping screws 228.

The case member 226 includes a peripheral wall 226c, a bottom wall 226d provided integrally with the lower end of the peripheral wall 226c, and a flange 226e provided integrally with the upper end of the peripheral wall 226c. A step portion 226a is formed on the peripheral wall 226c. The bottom wall 226d has a through hole 226f that radiates the sound of the piezoelectric diaphragm 225 to the outside, and a plurality of drain holes 226g that drains rainwater that has entered the inside, and the flange 226e is connected to the lower case 222 by a plurality of tapping screws 228. Installed.
A space 231 surrounded by the piezoelectric diaphragm 225 and the case member 226 serves as a resonance chamber and has a function of expanding the sound generated by the piezoelectric diaphragm 225.

14 is a cross-sectional view (reference example) of a meter according to the present invention. The same components as those in the first embodiment shown in FIG. 3 and the eighth embodiment shown in FIG. Is omitted.
The meter 241 includes a meter case 243 including a lower case 242 and an upper case 56, a substrate 58 attached to the lower case 242, an inner cover 61, a display plate 62, and an outer cover 63.

  The lower case 242 is integrally formed with a bulging portion 242a that bulges downward and an annular rib 242b that protrudes upward so as to be continuous with the edge of the bulging portion 242a, and the piezoelectric diaphragm 225 is formed on the rib 242b. Are attached by attachment members 244.

  The piezoelectric diaphragm 225 is connected to the two conducting wires 123 and 124. Specifically, the piezoelectric diaphragm 225 is applied to the upper end of the rib 242b and pressed against the bottom wall 244a of the mounting member 244 via a rubber 227 having an annular shape and an L-shaped cross section. Then, the attachment member 244 is fixed to the lower case 242 with a plurality of tapping screws 228, so that the piezoelectric diaphragm 225 is attached to the lower case 242.

  The bulging portion 242a includes a peripheral wall 242c and a bottom wall 242d integrally provided at the lower end of the peripheral wall 242c. The bottom wall 242d has a through hole 242f that radiates the sound of the piezoelectric diaphragm 225 to the outside, And a plurality of drain holes 242g for draining rainwater that has entered.

The mounting member 244 includes a peripheral wall 244c, a bottom wall 244a integrally provided at the upper end of the peripheral wall 244c, and a flange 244e integrally provided at the lower end of the peripheral wall 244c, and an opening 244f is opened in the bottom wall 244a. The flange 244e is attached to the lower case 242 with a plurality of tapping screws 228.
A space 246 surrounded by the piezoelectric diaphragm 225, the bulging portion 242a, and the rib 242b functions as a resonance chamber and expands the sound emitted by the piezoelectric diaphragm 225.

  As shown in FIG. 10 above, since the horn 201a as a loudspeaker is formed around the entrance opening 201b as a hole of the meter case 203 as a case, the sound of the buzzer 161 is increased by the horn 201a. Therefore, the antitheft effect can be improved and the buzzer 161 can be downsized.

  Further, since the horn 201a is formed in a bell mouth shape whose inner diameter increases exponentially as the distance from the buzzer 161 increases, the sound of the buzzer 161 can be effectively increased by the horn 201a. The antitheft effect can be improved and the buzzer 161 can be downsized.

  As shown in FIG. 11 above, since a plurality of swash plates 205 are provided outside the entrance opening 201b, rainwater can be removed from the entrance opening 201b without blocking the sound of the buzzer 161 by the swash plate 205. , Dirt and the like can be made difficult to enter. Furthermore, the sound of the buzzer 161 can be given directivity, and the sound of the buzzer 161 can be transmitted in a desired direction.

  Further, as shown in FIGS. 8A, 8B and 9, eighthly, a theft determination means 183 as a control unit for controlling the generation of a warning sound of the buzzer 161, and a drive circuit for the buzzer 161. Since the buzzer driving circuit 184 is built in the meter 150, the components of the anti-theft device 170 can be concentrated in one place, and the anti-theft device 170 can be downsized.

  In this embodiment, as shown in FIGS. 3A and 3B, the lower case 55 is provided with the cylindrical rib 55c surrounding the buzzer 74. However, the present invention is not limited to this, and the lower case 55 is provided with the buzzer 74. A plurality of surrounding columnar ribs (a gap is provided between the ribs) may be provided.

  The antitheft device of the present invention is suitable for a motorcycle.

It is a side view of the vehicle provided with the antitheft device which concerns on this invention. It is a front view (reference example) of the meter with which the vehicle concerning the present invention is equipped. It is explanatory drawing (reference example) of the meter which concerns on this invention. It is a block diagram of the board | substrate of the meter with which the vehicle which concerns on this invention is equipped. It is a flowchart which shows control of the control part of the antitheft device which concerns on this invention. It is explanatory drawing (reference example) of the meter which concerns on this invention. It is explanatory drawing (reference example) of the meter which concerns on this invention. It is explanatory drawing (reference example) of the meter which concerns on this invention. It is a block diagram of an alarm circuit according to the present invention. It is sectional drawing of the meter which concerns on this invention. It is explanatory drawing which shows the horn provided in the meter which concerns on this invention, and the horn periphery. It is explanatory drawing (reference example) which shows the lower case of the meter case which concerns on this invention. It is sectional drawing (reference example) of the meter which concerns on this invention. It is sectional drawing (reference example) of the meter which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 27, 101, 111, 150 ... Meter, 33 ... Engine, 41 ... Display part, 55a, 112c, 211b ... Hole (through hole), 55c ... Rib, 57, 203 ... Case (meter case), 58 ... Substrate, 71,183 ... Control unit, 73 ... Acceleration sensor, 74,118,161 ... Buzzer, 81,130,170 ... Anti-theft device, 83,102 ... Seal member, 184 ... Buzzer drive circuit, 201a, 211c ... Loudspeaker (horn), 201b... Hole (inlet opening).

Claims (6)

A display unit that displays a vehicle speed, an engine state, and the like of a vehicle, a substrate on which a control unit that controls the display unit is mounted, a meter that includes the display unit and a case that houses the substrate, and an acceleration sensor that detects vibration of the vehicle And a vehicle equipped with a theft prevention device having a buzzer that issues a warning based on a signal from the acceleration sensor,
The control unit operates the buzzer (161) based on a signal from the acceleration sensor,
The buzzer (161) is mounted on the substrate (154),
The case (201) has a hole (201b) that allows the buzzer (161) to face the outside,
A loudspeaker (201a) is formed around the hole (201b),
The loudspeaker portion (201a) is formed in a bell mouth shape in which the inner diameter increases exponentially as the distance from the buzzer (161) increases.
A vehicle antitheft device characterized by the above . The vehicle antitheft device according to claim 1, wherein a sealing member (162) is provided between the buzzer (161) and the case around the hole (201b) . The antitheft device for a vehicle according to claim 1 or 2, wherein the buzzer (161) is disposed in the case (201) . Claim according to claim 1 a vehicle theft prevention device according to the outside swash plate (205) and being provided in said hole (201b). The vehicle antitheft device according to claim 1 , wherein the acceleration sensor is mounted on the substrate (154) . The antitheft device for a vehicle according to claim 1 , wherein the meter includes a control unit (183) for controlling generation of a warning sound of the buzzer (161) and a drive circuit (184) for the buzzer.

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