JP5740604B2 - In-vehicle alarm device - Google Patents

Description

  The present invention relates to a vehicle-mounted alarm device that detects and notifies a microwave transmitted from a detection target (target) such as a vehicle speed measurement device.

  2. Description of the Related Art Conventionally, an in-vehicle alarm device that detects and notifies a microwave transmitted from a vehicle speed measuring device is known (Patent Document 1). This on-vehicle alarm device has an essential configuration for receiving an microwave, and a three-dimensional antenna composed of a horn antenna is used.

  On the other hand, the microwave radiated from the vehicle speed measuring device has conventionally been the mainstream of vertical polarization, but a vehicle speed measuring device using a horizontally polarized microwave has appeared, and the conventional horn antenna is Although it was suitable for receiving vertical polarization, it could not receive horizontal polarization sufficiently.

  Therefore, an in-vehicle alarm device having a patch antenna radiating element and having a pattern in which each side constituting the patch antenna radiating element is inclined with respect to a vertical or horizontal direction when the antenna is installed has been invented (Patent Document). 2).

Japanese Patent Laid-Open No. 10-341113 JP 2009-288130 A

  According to the invention described in Patent Document 2, an in-vehicle alarm device capable of obtaining an appropriate gain for both horizontal polarization and vertical polarization has been realized. However, when this on-vehicle alarm device is installed in a vehicle, it is necessary to install the pattern surface of the patch antenna radiating element so as to be perpendicular to the traveling direction of the vehicle due to the directivity of the patch antenna radiating element. .

  Therefore, even if an in-vehicle alarm device can be installed on the rear surface of a rearview mirror having a plane perpendicular to the vehicle traveling direction, the same in-vehicle alarm device is connected to a dash formed of a plane parallel to the vehicle traveling direction. When installed on a board, the sensitivity of microwave detection will be reduced due to the directivity of the patch antenna radiating element, so it is necessary to prepare an in-vehicle alarm device for each vehicle installation location. was there.

  The present invention solves the above-described conventional problems, and provides an in-vehicle alarm device that can be installed without considering the installation location of the vehicle and can improve the sensitivity to detect microwaves. With the goal.

  In order to solve the above-described conventional problems, an in-vehicle alarm device according to the present invention includes (1) an installation unit that can be installed in a vehicle in both a vertical posture and a horizontal posture, and a reception unit that receives microwaves. And an alarm device for vehicle that issues an alarm based on the microwave received by the receiving means, wherein the receiving means has a directivity for receiving the microwave and the vertical posture It is characterized by having a configuration in the vehicle front direction in both horizontal postures. Therefore, it can be installed on either the rear surface of the rearview mirror having the installation surface in a direction perpendicular to the vehicle front direction and the dashboard upper surface having the installation surface in a direction parallel to the vehicle front direction, Since the directivity for microwave reception is always provided in the vehicle front direction, the sensitivity for detecting the microwave can be maintained in a good state.

  Here, the vertical posture means that the in-vehicle alarm device is fixed to the installation surface perpendicular to the ground on which the vehicle tire contacts the ground, and the horizontal posture refers to the ground on which the vehicle tire contacts the ground. This means that the in-vehicle alarm device is fixed on the parallel installation surface. It should be noted that the present invention is not limited to a completely vertical or parallel installation surface, and is a concept including a case where a slight inclination is generated within a range in which the object of the present invention can be achieved.

  (2) The installation means includes a first fixing means for fixing to the rear surface of the rearview mirror in the vertical attitude and a second fixing means for fixing on the dashboard in the horizontal attitude. Therefore, the vehicle-mounted alarm device can be fixed to the rear surface of the rearview mirror in the vertical posture by the first fixing means, and the vehicle-mounted alarm device can be fixed on the dashboard in the horizontal posture by the second fixing means. Therefore, the directivity for receiving the microwave can be surely provided in the vehicle front direction, and the sensitivity for detecting the microwave can be maintained in a good state.

  (3) The first fixing means and the second fixing means are configured as a common fixing surface for the room mirror and the dashboard. Therefore, the first fixing means and the second fixing means can be improved in appearance as compared with the case where the first fixing means and the second fixing means are installed on separate fixing surfaces, and the vehicle-mounted alarm device can be reduced in size.

  (4) The receiving means has a configuration in which directivity for receiving the microwave is provided in the vehicle front direction in both the vertical posture and the horizontal posture, from the microwave emission source to issue the warning. In the state where the receiving means is located at a position where it is necessary to emit light, the microwave from the emission source is within a range where the half value angle of the receiving means in the horizontal posture and the half value angle of the receiving means in the vertical posture overlap. The irradiation range is included. Here, the half-value angle refers to an angle formed by a point where the intensity (power) becomes half (−3 dB) around the point where the radio wave is strongest. The half-value angle indicates the sharpness of directivity, and the smaller the sensitivity (operation gain), the higher the sensitivity (operating gain). Therefore, the micro-value from the emission source is within the overlapping range of the half-value angle of the receiving unit in the horizontal posture and the half-value angle of the receiving unit in the vertical posture. If the irradiation range of waves is included, microwaves can be reliably received in the horizontal posture and the vertical posture.

  (5) The receiving means is configured such that the directivity for receiving the microwave is in the vehicle front direction in both the vertical attitude and the horizontal attitude, and the antenna directivity of the receiving means is the vertical attitude. And the horizontal posture in the vehicle forward direction. For example, when a patch antenna radiating element is used as an antenna, the pattern surface of the patch antenna radiating element may be perpendicular to the vehicle traveling direction in both the vertical posture and the horizontal posture. Therefore, if the patch antenna radiating element is installed at both a vertical posture and a horizontal posture and inclined by 45 degrees with respect to the fixed surface, directivity for receiving microwaves can be provided in the vehicle front direction.

  (6) The receiving means is provided at a position where the receiving means has antenna directivity as a configuration in which the directivity for receiving the microwave is provided in the vehicle front direction in both the vertical posture and the horizontal posture. Further, the directivity of the reflecting plate has a configuration in the vehicle front direction in both the vertical posture and the horizontal posture. For example, when a patch antenna radiating element is used as an antenna, the pattern surface of the patch antenna radiating element is directed 90 degrees (vertical direction) with respect to the traveling direction, and is perpendicular to the pattern surface of the patch antenna radiating element. The reflector may be installed at an angle (for example, 22.5 degrees) that can be received in both the posture and the horizontal posture.

  (7) The receiving unit has a configuration in which the directivity for receiving the microwave is in the vehicle front direction in both the vertical posture and the horizontal posture, and the directivity of the antenna included in the receiving unit is the vertical posture. The microwave provided in the vehicle front direction in any one of the horizontal postures, and provided in a position where the antenna has directivity in either the vertical posture or the horizontal posture different from the one of the horizontal postures It is characterized by providing the change means which changes the incident direction with respect to the said antenna. For example, when a patch antenna radiating element is used as an antenna and the patch antenna radiating element is fixed so as to be parallel to the fixed surface, the pattern surface of the patch antenna radiating element travels in the vehicle in a vertical posture. In the case of being perpendicular to the direction, if the reflecting surface of the reflector is inclined 45 degrees with respect to the vehicle traveling direction in a horizontal posture, the directivity for receiving microwaves can be increased. It can have in the vehicle front direction. Conversely, when the pattern surface of the patch antenna radiating element is made parallel to the vehicle traveling direction in a horizontal posture, the reflecting surface of the reflector is inclined 45 degrees with respect to the vehicle traveling direction in the vertical posture. If it is made the state made into, it can have the directivity for reception of a microwave in a vehicle forward direction. In addition, it is also possible to use a horn antenna instead of a patch antenna radiating element as an antenna. Even when a horn antenna is used, the directivity for receiving microwaves is vertical by using a reflector. It can be set as the structure which has in a vehicle front direction in both a horizontal attitude | position.

  (8) When the directivity of the antenna included in the receiving unit is in the vertical direction perpendicular to the vehicle front direction in the horizontal posture, the changing unit is positioned rearward of the receiving unit and the vehicle It is characterized by being disposed at an angle of less than 90 degrees from the vertical direction perpendicular to the forward direction to the receiving means side. By adopting the above configuration, the predetermined angle for inclining the changing means is determined by the size of the changing means and the receiving means and the installation interval thereof, so that the design of the in-vehicle alarm device is facilitated.

  (9) The changing means includes an adjusting means for adjusting an incident direction with respect to the antenna. For example, when a reflecting plate is used as the changing means, the inclination of the reflecting plate is adjusted so that the directivity for receiving microwaves is in the vehicle front direction in both the vertical posture and the horizontal posture. It is sufficient to install an adjusting means that can be used on the reflector.

  (10) The changing means is a reflecting means for reflecting microwaves, and the normal of the reflecting surface of the reflecting means is arranged to have a predetermined angle with respect to the main directivity direction of the antenna. . An example of the reflecting means is a reflecting plate. By attaching and removing the reflector, or changing the angle of the reflector, the directivity for receiving microwaves is always in the vehicle front direction in both the vertical and horizontal postures. be able to.

  (11) A housing for storing a portion of the receiving unit other than the changing unit is provided, and the changing unit is configured to be removable and attached to the housing. For example, when a reflecting plate is used as the changing means, the reflecting plate may or may not be necessary depending on the mounting position of the in-vehicle alarm device. By making it possible, it is possible to cope with both cases where a reflector is necessary and when it is not necessary.

  (12) The housing includes a changing unit removal storage unit that stores the removed changing unit when the changing unit is detached from the housing, and the changing unit removal storage unit is directed to the antenna. It is characterized by being arranged avoiding the position that has the property. For example, when a reflecting plate is used as the changing means and the on-vehicle alarm device is not used, if the reflecting plate is installed as it is, the field of view ahead of the vehicle may be hindered. In this case, if the reflecting plate can be stored in the housing, the field of view ahead of the vehicle is not hindered, and the in-vehicle alarm device can be downsized without affecting the microwave reception sensitivity.

  (13) The reflection means is a reflection plate, and the housing includes an attaching portion that attaches the reflection plate at the predetermined angle. Therefore, it is possible to complete the installation work of the reflector simply by attaching the reflector to the affixing portion in consideration of the attachment angle of the reflector in advance, and the reflector can be easily installed.

(14) A vehicle-mounted alarm device comprising display means for displaying alarm information based on the microwave received by the receiving means,
The display means has a display surface, the reflection means is disposed on the back side of the display surface of the display means, and the reflection means and the display means are integrated with the housing by the adjustment means. It is characterized in that it is arranged with a predetermined angle with respect to it. Therefore, when the directivity for receiving microwaves is a vertical posture and the driver does not need to look at the display means, the display means is fixed in a state of being bent at a predetermined angle by the adjusting means. That's fine.

  (15) The reflection means has a reflection surface, and the display surface of the display means and the reflection surface of the reflection means are arranged with a predetermined angle. Therefore, for example, when installed on the dashboard in a horizontal posture, the main directivity direction of the antenna in the housing is directed to the top surface, and the display means is bent 90 degrees with respect to the housing and displayed from the direction of the driver, etc. When the surface is made visible, the microwaves from the vehicle front direction can be reflected by the reflecting means arranged on the back side of the display surface of the display means so as to be incident on the upper surface direction that is the antenna directing direction. . On the other hand, for example, when the antenna is disposed on the back surface of the mirror in a vertical posture, the main directivity direction of the antenna in the housing is the traveling direction, and microwaves can be received. When the directivity for receiving microwaves is a vertical posture and the driver does not need to look at the display means, the display means is fixed in a state bent at a predetermined angle by the adjusting means. You may do it. In this way, the display means does not disturb the field of view. In particular, the display means and the reflection means are arranged in a housing different from the housing and integrally have a predetermined angle with respect to the housing, and a state having no angle (a state of 0 degrees). It may be configured to adopt. The predetermined angle is, for example, a configuration in which the main directing direction of the antenna in the housing faces the top surface when installed on the dashboard in a horizontal posture, and the display means is bent 90 degrees with respect to the housing to When the display surface can be viewed from the direction, it is preferable that the reflection means be less than 90 degrees with respect to the antenna surface. In particular, it may be set to 60 degrees or less, and preferably 45 degrees.

  The in-vehicle alarm device according to the present invention is provided on any one of a rear surface of a rearview mirror having an installation surface in a direction perpendicular to the vehicle front direction and a dashboard upper surface having an installation surface in a direction parallel to the vehicle front direction. Since the directivity for receiving microwaves is always provided in the vehicle front direction, the sensitivity for detecting microwaves can be maintained in a good state.

  In addition, the on-vehicle alarm device according to the present invention requires the changing means that changes the incident direction to the microwave antenna to be removable and attachable to the housing, so that the changing means is necessary and unnecessary. Both cases can be dealt with. Furthermore, if the changing means can be stored in the housing, the vehicle-mounted alarm device can be reduced in size without hindering the field of view in front of the vehicle.

External view of in-vehicle alarm device according to the present invention Block diagram showing internal functions of in-vehicle alarm system Plan view showing a patch antenna for use in a vehicle alarm system Explanatory drawing which shows 1st Embodiment of this invention. Explanatory drawing which shows 1st Embodiment of this invention. Explanatory drawing which shows 2nd Embodiment of this invention. Explanatory drawing which shows 2nd Embodiment of this invention. Explanatory drawing which shows 3rd Embodiment of this invention. Explanatory drawing which shows 4th Embodiment of this invention. Explanatory drawing which shows 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a preferred appearance of an in-vehicle alarm device according to the present invention, FIG. 1 (c) is a front view, FIG. 1 (b) is a plan view, and FIG. 1 (d) is a bottom view. FIG. 1 (a) is a left side view of FIG. 1 (b), and shows a state where it is attached to the rear surface of the room mirror 31b. FIG. 2 shows functional blocks inside the in-vehicle alarm device 1.

  The in-vehicle alarm device 1 includes a casing 4 that includes a flat case body 2 that is flat and has one surface open, and a lid 3 that closes the opening of the case body 2. The housing 4 has a simple rectangular box shape. Various input means, control means, output means, and the like are mounted in the housing 4.

  A microwave receiver 5 for detecting microwaves in a frequency band emitted by the speed measuring device and a wireless receiver 6 for receiving various radio waves in one half of the front side (vehicle forward direction A side) of the case body 2. Place. The antennas of the receivers 5 and 6 are planar antennas and are arranged in parallel with the lid 3. This is preferable because it can be efficiently stored in the thin case body 2.

  Further, a GPS receiver 7 is disposed at a predetermined internal position on one side half opposite to the area where the receivers 5 and 6 on the front side of the case body 2 are mounted. The GPS antenna that constitutes the GPS receiver 7 is preferably arranged so as to be inclined obliquely upward.

  For example, when the upper surface 2a of the case body 2 is inclined, if the GPS antenna is disposed along the inner wall of the upper surface 2a, the case body 2 can be directed obliquely upward. Of course, it is not necessary to make it parallel to the inclination of the upper surface 2a (inner wall), the inclination angle can be arbitrary, and the size and shape of the GPS antenna is smaller than the internal space above the case body 2 May be arranged so as to face directly above.

  Although not specifically shown, each receiver includes an antenna and a receiving circuit. An output signal based on reception by each receiver is given to the control unit 18.

  A DC jack 8 and a memory card slot 9 are disposed on one side surface 2 b of the case body 2. The side surface 2b on which these are arranged is the left side surface, that is, the side surface 2b positioned on the driver side when the vehicle alarm device 1 is mounted on the rearview mirror. The DC jack 8 is connected to an internal power supply circuit, and supplies power to each part in the in-vehicle alarm device 1 via the power supply circuit.

  The DC jack 8 is for mounting a DC plug connected to the tip of the power supply direct connection cord, and the other end of the power supply direct connection cord is connected to the battery of the vehicle. Thereby, the vehicle-mounted alarm device 1 receives power supply from the battery. Connection to the battery can be made by connecting to an accessory (ACC) power supply direct connection cord linked to engine start / stop, or by connecting to a predetermined terminal of the fuse box. It can be carried out.

  The memory card slot 9 has an opening for the side surface 2b. The memory card 10 can be detachably attached to the memory card slot 9 from its insertion slot. The memory card 10 is, for example, a micro SD card.

  Data stored in the memory card 10 inserted in the memory card slot 9 can be taken in. More specifically, the data stored in the memory card 10 includes update information such as information on a new target for performing an alarm based on position information (position information including longitude and latitude, type information, etc.) The update information is stored (downloaded) in the database 19 built in the apparatus via the control unit 18, and the data is updated. Of course, in addition to such data update, it can also be used to download programs for adding functions and upgrading versions.

  In the data update process, for example, the power switch 11 is operated and the vehicle alarm device 1 is turned off, and the memory card 10 in which the update data is stored is inserted into the memory card slot 9. In that state, the power is turned on.

  Thereby, the control unit 18 checks whether or not the memory card 10 is inserted in the memory card slot 9 as a process at the time of turning on the power.

  That is, the control unit 18 first accesses the memory card 10 to authenticate that it is a regular memory card for data update, and if it is legitimate, reads the stored data and performs data update processing. When the update is completed, the control unit 18 emits a sound (sound) notifying the end from the speaker 13. Thereafter, the control unit 18 executes normal initial processing and starts up the system.

  Also, if the installed memory card is a memory card that stores data for a different model, or if it is for this model, if the version is the same or older, it will end with an error and return to normal Execute the process and start up the system. In particular, in the in-vehicle alarm device 1 of the present embodiment having no display unit, even if a memory card is mounted after the power is turned on, it is troublesome to perform data update processing appropriately by remote control operation. This is convenient because the data can be automatically updated by turning on the power with the.

  The database 19 is a nonvolatile memory (for example, EEPROM) in the microcomputer of the control unit 18 or externally attached to the microcomputer. In the database 19, information related to a certain target is registered at the time of shipment, and data and the like regarding the target added after that can be updated as described above.

  On the lower surface 2 c side of the case body 2, a power switch 11, a lamp 12, a speaker 13, and an infrared light receiving unit 16 a of a remote control receiver 16 are provided. The power switch 11 is a slide switch that moves in the left-right direction, and is turned on when turned on. The lamp 12 indicates the state of a device such as power ON / OFF and GPS reception. Specifically, the lamp 12 is turned off when the power is off, and the lamp 12 is turned on when the power is turned on. .

  In addition, after the power is turned on, the lamp 12 blinks during searching by the GPS receiver 7 and during an alarm based on GPS. Further, the blinking pattern during the search and the blinking pattern during the alarm may be the same or different. If you want to make a difference, it is better to make the warning flash in a shorter cycle and draw attention. In addition to the alarm based on GPS, the lamp 12 may be blinked in an appropriate pattern in the case of an alarm based on the microwave receiver 5 and / or the wireless receiver 6. Furthermore, different color LEDs may be prepared to change the color development.

  The speaker 13 is a small high-quality speaker. That is, in order to reduce the size and weight of the in-vehicle alarm device 1, a small speaker is used. Furthermore, since the display unit is not provided, the main notification means is sound for alarm / guidance notification. Therefore, it is easy to listen by notifying with high-quality sound. The synthesized speech generated and output by the control unit 18 also uses a high sound quality speech synthesis IC.

  The GPS alarm function is a process executed at a predetermined time interval (1 second interval) by an event from a timer included in the control unit 18 and detected by the latitude and longitude of the target stored in the database 19 and the GPS receiver 7. In this processing, the distance between the current position is obtained from the latitude and longitude of the current position, and when the obtained distance becomes a predetermined approach distance (for example, within 500 m), an approach warning sound indicating that is output from the speaker 13.

Such targets include snoozing driving accident points, radar, speed limit switching points, control areas, inspection areas, parking monitoring areas, N systems, traffic monitoring systems, intersection monitoring points, signal ignorance suppression systems, police stations, frequent accidents Area, frequent on-board areas, sudden / continuous curve (highway), branch / merge point (highway), ETC lane advance guidance (highway), service area (highway), parking area (highway), highway Oasis (highway), smart interchange (highway), PA / SA petrol station (highway), tunnel (highway), highway radio reception area (highway), prefectural border notice, roadside station, viewpoint parking, etc. The type information of these targets, the latitude / longitude information indicating the position thereof, and the display on the display unit 5 Stored in the database 19 in association with the picture or photograph data and voice data.

  The radar wave warning function is used when the microwave receiver 5 detects a signal corresponding to a microwave in a frequency band emitted from a velocity measuring device (mobile radar or the like (hereinafter simply referred to as “radar”)). This is an alarm function for outputting an alarm sound from the speaker 13. For example, when a microwave in the microwave frequency band emitted by the radar is detected by the microwave receiver 5, the voice data stored in the database 19 is read out and the voice “Radar. Output. During the sound output, the alarm lamp 12 is turned on.

  The wireless alarm function is a function for issuing an alarm so that the wireless receiver 6 does not interfere with the traveling or the like when a radio wave emitted by an emergency vehicle or the like is received. In the radio alarm function, the control radio, car radio, digital radio, special radio, police radio, police phone, police activity radio, wrecker radio, heli tele radio, fire helicopter radio, fire fight radio, emergency radio, expressway radio When the radio frequency is scanned at the scanned frequency and the radio frequency is received, the voice data stored in the database 19 for each radio type is read out, and the alarm sound indicating the radio type is read from the speaker 13. Is output. For example, when a control radio is received, a voice is output like “control radio. Speed attention”. During the sound output, the alarm lamp 12 is turned on.

  FIG. 3 shows a patch antenna including a microwave receiver 5 which is a receiving means for receiving microwaves used in the in-vehicle alarm device of the present invention. A patch antenna 20 for a microwave receiver for detecting a vehicle speed measuring device has a conductor film of a predetermined shape patterned on the surface of a rectangular substrate 21 (double-sided printed circuit board), and a conductor film formed on the entire back surface. It has a structure in which a ground is formed by forming a film. The patch antenna 20 is arranged in parallel to the plane of the lid 3 in the casing 4 of the in-vehicle alarm device 1 shown in FIG. 1A, and the back surface of the substrate 21 is on the lid 3 side. The substrate 21 is installed so that the pattern surface of the surface of the substrate 21 is on the vehicle front direction A side. Further, the normal line of the pattern surface is installed so as to be parallel to the vehicle front direction A. And the pattern of the predetermined shape of the surface of the board | substrate 21 has the structure shown below.

  First, as shown in FIG. 1B, the longitudinal direction of the substrate 21 of the microwave receiver 5 is installed in parallel with the longitudinal direction of the housing 4. As shown in FIG. Two square patch antenna radiating elements 22 are formed along the longitudinal direction. The patch antenna radiating element 22 is inclined. Specifically, the longitudinal direction of the substrate 21 is used as a reference, and as shown in FIG. 1 (a), the in-vehicle alarm device 1 is installed on an installation surface perpendicular to the ground on which the vehicle tire contacts (vertical). In the case of the posture), the longitudinal direction of the substrate 21 was parallel to the ground on which the tires contacted, and the inclination angle of the patch antenna radiating element 22 with respect to the longitudinal direction of the substrate 21 was 27 degrees. That is, as shown in FIG. 3, the vertical and horizontal sides of the patch antenna radiating element 22 are formed to be inclined by 27 degrees from the longitudinal or short axis of the substrate 21. The inclination angle is most preferably 27 degrees. However, the range up to 27 ° ± 10 is suitable for reception with respect to both vertical polarization and horizontal polarization velocity measuring devices, and therefore should be within this range. Of course, depending on the sensitivity of the high-frequency circuit that processes the signal received by the antenna 20, the required specifications, and the like, there are cases in which an angle exceeding the above range can be handled.

  Further, the power supply to the patch antenna radiating element 22 is performed from the upside down side. That is, power is supplied from the upper side to the left patch antenna radiating element 22 in the drawing, and power is supplied from the lower side to the right patch antenna radiating element 22. The microstrip lines 23 and 24 for supplying power to each of them are branched from the tip of the common microstrip line 25, and the lengths thereof are the tip 23a of the microstrip line 23 and the tip 24a of the microstrip line 24. In such a position, the length is set so that the phase is reversed by 180 degrees. Then, both the tips 23 a and 24 a are connected to the feeding point X in each patch antenna radiating element 22.

  Further, as is apparent from the figure, a concave (slit-shaped) cut portion 22b is provided from the vicinity of the center of the side 22a on the feeding side of the patch antenna radiating element 22 toward the center, and the microstrip lines 23 and 24 are respectively It enters into the cut portion 22b and is connected at the feed point X at the deepest portion of the cut portion 22b. By doing so, the impedance at the connection site between the microstrip lines 23 and 24 and the patch antenna radiating element 22 is lowered, and matching is facilitated.

  One end of the common microstrip line 25 (on the side not connected to the microstrip lines 23 and 24) is connected to a through hole 26 that penetrates the substrate 21, and is provided on the back side of the substrate 21 (not shown) of the through hole 26. Conductive with the other terminal (non-conductive with the ground on the back). As a result, signals received by both patch antenna radiating elements 22 reach the through hole 26 from the respective microstrip lines 23 and 24 via the common microstrip line 25 and are transmitted to the terminals on the back side of the substrate 21.

  In the patch antenna having the antenna pattern with the inclination angle set to 27 degrees, the vertical gain is 6 dB and the horizontal gain is about -3 dB, and the performance equivalent to that of the conventional configuration using the wave plate is obtained. As a result, it is possible to receive not only vertically polarized waves but also horizontally polarized microwaves while using a patch antenna composed of a single substrate.

  Further, in this embodiment, the pattern layout is such that two patch antenna radiating elements 22 are arranged side by side. However, the present invention is not limited to this. For example, four (2 Or any other number can be set.

  Furthermore, it attaches to the flat box-shaped shield part 27 which incorporates a high frequency circuit. At this time, a connection is made to the high-frequency circuit through the above-described terminals, and a module including the antenna 20 and the high-frequency circuit (receiving circuit) is configured.

  In the illustrated example, the module is mounted on the main board 28. The main board 28 determines whether or not the microwave received by the antenna 20 is emitted from the speed measurement device (target) that is the detection target, and is the microwave from the target. When it is determined, a drive circuit or the like for controlling the operation of the alarm means for issuing an alarm is mounted.

  As described with reference to FIGS. 1 to 3, the in-vehicle alarm device according to the present invention includes a microwave receiver, a wireless receiver, a GPS receiver, a memory card slot, which is a receiving means for receiving microwaves, The memory card, power switch, lamp and speaker as alarm means, remote control receiver, control unit, database, etc. are stored in the housing, and can be installed in the vehicle in both vertical and horizontal positions, in particular. The installation means, the reception means for receiving the microwave, and the alarm means for issuing an alarm based on the microwave received by the reception means are essential. 4 and 5 are configurations in which a mechanism capable of changing the position of the patch antenna is added to the configuration of FIG. 4 and 5, components using the same word / phrase have a configuration succeeding the configurations of FIGS. 1 to 3 even if the reference numerals are different.

4 and 5 are explanatory views of the inside of the casing 39 of the in-vehicle alarm device 30 as viewed from the right side surface direction of the vehicle. The casing 39 of the in-vehicle alarm device 30 shown in FIG. 4 is installed in a horizontal posture on the dashboard 31a by a fixing member 32a as installation means. Here, the horizontal posture means that the in-vehicle alarm device 30 is fixed to an installation surface parallel to the ground on which the vehicle tire contacts the ground. On the other hand, the casing 39 of the in-vehicle alarm device 30 shown in FIG. 5 is installed on the back surface of the room mirror 31b in a vertical posture by a fixing member 32b as installation means. Here, the vertical posture means that the in-vehicle alarm device 30 is fixed to an installation surface perpendicular to the ground on which the tire of the vehicle contacts the ground. Further, since the fixing member 32a and the fixing member 32b are provided on the same fixing surface 32 of the casing 39, the appearance can be improved as compared with the case where the fixing member 32a and the fixing member 32b are installed on separate fixing surfaces, and the vehicle is mounted on the vehicle. The alarm device 30 can be downsized. Moreover, if both the horizontal attitude | position and the vertical attitude | position which mentioned above the vehicle-mounted alarm device 30 can be maintained by using a double-sided tape and a hook-and-loop fastener for the fixing member 32a and the fixing member 32b, a fixing member 32a and the fixing member 32b can be made common to form one fixing member.

The in-vehicle alarm device 30 includes a microwave receiver 33 that is a receiving unit that receives microwaves, and a lamp and a speaker 34 that are alarm units that issue an alarm based on the microwaves. As described above, the on-vehicle alarm device 30 can be provided with a wireless receiver or a GPS receiver in the casing, but is omitted for the description of the present invention. Here, the microwave receiver 33 has the patch antenna 37 described above, and the patch antenna 37 is applied to the microwave by a changing member 35 that is a changing means including a rotating shaft provided at one end. The reception angle can be changed. Further, a slide shaft 37a provided at one end portion of the patch antenna 37 by an adjusting means 36 having a groove portion 36a provided at the other end portion and a locking portion 36b provided with a plurality of locking grooves. And a pair of locking projections (not shown) installed on the upper portion of the patch antenna 37 are locked in the locking grooves of the locking portion 36b and the patch antenna 37 is temporarily fixed, thereby receiving microwaves. The configuration allows fine adjustment of the angle. Here, the pattern surface 37 b of the patch antenna 37 is formed on the side not parallel to the fixed surface 32 in a state parallel to the fixed surface 32.

Further, since the patch antenna 37 has directivity in the direction perpendicular to the pattern surface 37b, the casing 39 of the in-vehicle alarm device 30 is placed in a horizontal posture on the dashboard 31a as shown in FIG. In the case of installation, if fine adjustment is performed by the adjustment member 36 that is an adjustment means so that the pattern surface 37b of the patch antenna 37 is perpendicular to the vehicle traveling direction A, the directivity of the patch antenna 37 is changed to the vehicle front direction. A can be included in A, and the sensitivity to receive microwaves can be improved.

Further, as shown in FIG. 5, the pattern surface 37 b of the patch antenna 37 is perpendicular to the vehicle traveling direction A even when the casing 39 of the in-vehicle alarm device 30 is installed in the vertical posture on the back surface of the room mirror 31 b. When the adjustment member 36 is finely adjusted so as to achieve the above, the directivity of the patch antenna 37 can be provided in the vehicle front direction A, and the sensitivity to receive microwaves can be improved.

Here, in the first embodiment described above, the change member 35 and the adjustment member 36 are used to change and finely adjust the angle of the patch antenna 37 with respect to the microwave. It is good also as a structure which does not have a structure and fixes the patch antenna 37 at a predetermined angle. In this case, for example, if the pattern surface 37b of the patch antenna 37 is fixed so as to be inclined by 45 degrees with respect to the vehicle traveling direction, the vehicle-mounted alarm device 30 is installed in a horizontal posture on the dashboard 31a. In both cases where the rear surface mirror 31b is installed in a vertical posture, the microwave receiver 33 can be configured to have directivity for microwave reception in the vehicle front direction A.

Further, the microwave receiver 33 is configured to have directivity for microwave reception in the vehicle front direction A in both the vertical posture and the horizontal posture, and it is necessary to issue a warning from a microwave emission source that should issue a warning. In the state where the microwave receiver 33 is located at a certain distance, the range from the emission source is within the overlapping range of the half-value angle of the microwave receiver 33 in the horizontal posture and the half-value angle of the microwave receiver 33 in the vertical posture. A microwave irradiation range may be included. Here, the half-value angle refers to an angle formed by a point where the intensity (power) becomes half (−3 dB) around the point where the radio wave is strongest. The half-value angle indicates the sharpness of directivity, and the smaller the sensitivity (operation gain), the higher the sensitivity (operating gain). Therefore, the half-value angle is in a range of overlap between the half-value angle of the microwave receiver 33 in the horizontal posture and the half-value angle of the microwave receiver 33 in the vertical posture. If the microwave irradiation range from the emission source is included, the microwave can be reliably received in the horizontal posture and the vertical posture.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7 are explanatory views of the inside of the casing 49 of the in-vehicle alarm device 40 viewed from the right side surface direction of the vehicle. Here, FIGS. 6 and 7 are configurations in which a mechanism capable of reflecting microwaves is added to the configuration of FIG. 6 and 7, the components using the same word / phrase have a configuration succeeding the configurations of FIGS. 1 to 3 even if the reference numerals are different. A casing 49 of the in-vehicle alarm device 40 shown in FIG. 6 is installed by a fixing member 42b in a vertical posture on the back surface of the room mirror 41b. Here, the vertical posture means that the in-vehicle alarm device 40 is fixed to an installation surface perpendicular to the ground on which the tire of the vehicle contacts the ground. On the other hand, the casing 49 of the in-vehicle alarm device 40 shown in FIG. 7 is installed on the dashboard 41a by a fixing member 42a in a horizontal posture. Here, the horizontal posture means that the in-vehicle alarm device 40 is fixed to an installation surface parallel to the ground on which the vehicle tire contacts the ground. And since the fixing member 42a and the fixing member 42b are provided in the same fixing surface 42 of the housing | casing 49, while being able to improve appearance compared with the case where it installs in a separate fixing surface, it is vehicle-mounted. The alarm device 40 can be downsized. Moreover, if both the horizontal attitude | position and the vertical attitude | position which mentioned above the vehicle-mounted alarm device 40 can be maintained by using a double-sided tape and a hook-and-loop fastener for the fixing member 42a and the fixing member 42b, a fixing member 42a and the fixing member 42b can be made common to form one fixing member.

The in-vehicle alarm device 40 includes a microwave receiver 43 that is a reception unit that receives microwaves, and a lamp and speaker 44 that are alarm units that issue an alarm based on the microwaves. Here, the microwave receiver 43 has a patch antenna 47. In the patch antenna 47, the fixed surface 42 on which the fixing members 42a and 42b are installed and the pattern surface 47a of the patch antenna 47 are parallel to each other. As shown in FIG. Here, the pattern surface 47 a of the patch antenna 47 is formed on the side not facing the fixed surface 42.

In the second embodiment, the reflecting member 48 made of a metal reflecting plate 48a that reflects microwaves is changed by the changing member 45 made of a rotating shaft that is a changing means provided at one end of the reflecting plate 48a. The reflection angle with respect to the microwave can be changed. Further, the adjusting member 46 having the groove 46a provided at the other end which is the adjusting means and the engaging portion 46b having a large number of engaging grooves is provided at the other end of the reflecting plate 48a. By guiding the sliding shaft 48b and a pair of locking projections (not shown) installed on the upper portion of the reflecting member 48 being locked in the locking grooves of the locking portion 46b, the reflecting plate 48a is temporarily fixed, The configuration is such that the reception angle with respect to the microwave can be finely adjusted.

Here, since the patch antenna 47 has directivity in the vertical direction with respect to the pattern surface 47a, as shown in FIG. 6, the casing 49 of the in-vehicle alarm device 40 is perpendicular to the back surface of the room mirror 41b. When installed in a posture, the pattern surface 47 a of the patch antenna 47 is perpendicular to the vehicle traveling direction A. Accordingly, by fixing the reflecting surface of the reflecting plate 48a which is the reflecting member 48 constituting the reflecting means by the changing member 45 and the adjusting member 46 so as to be parallel to the vehicle traveling direction A, the patch antenna 47 is directed. Therefore, the sensitivity to receive microwaves can be improved.

On the other hand, as shown in FIG. 7, when the casing 49 of the in-vehicle alarm device 40 is installed in a horizontal posture on the dashboard 41 a, the reflection member 48 a which is the reflection member 48 is changed by the change member 45 and the adjustment member 46. By fixing the reflecting surface to be inclined by 45 degrees with respect to the vehicle traveling direction A (the arrangement is such that the normal of the reflecting surface of the reflecting plate 48a has an angle of 45 degrees with respect to the main directivity direction of the antenna). In addition, the directivity of the patch antenna 47 can be provided in the vehicle front direction A, and the sensitivity to receive microwaves can be improved.

Here, in the second embodiment described above, the change member 45 and the adjustment member 46 are used to change and finely adjust the reflection angle of the reflection plate 48a, which is the reflection member 48, with respect to the microwave. It is good also as a structure which does not have the structure of 45 and the adjustment member 46, and fixes the reflecting plate 48a at a predetermined angle. In this case, for example, if the reflecting surface of the reflecting plate 48a is fixed so as to be inclined 22.5 degrees in a vertical posture and 67.5 degrees in a horizontal posture with respect to the vehicle traveling direction A, the vehicle-mounted alarm device 40 The directivity for microwave reception of the microwave receiver 43 is set in both the case where the casing 49 is installed in a horizontal posture on the dashboard 41a and the case in which the case 49 is installed in the vertical posture on the rear surface of the room mirror 41b. It can be set as the structure which has it in the front direction A.

Next, an in-vehicle alarm device according to a third embodiment of the present invention will be described with reference to FIG. Here, FIG. 8 is a configuration in which a mechanism capable of reflecting microwaves is added to the configuration of FIG. In FIG. 8, components using the same word / phrase have a configuration succeeding the configurations of FIGS. 1 to 3 even if the reference numerals are different. The on-vehicle alarm device shown in FIG. 8 is similar to the second embodiment in that it includes a change member 55 and an adjustment member 56, but the change member 55 is a rotating shaft 55a and a reflection means that is a reflection means. The adjustment member 56 includes a ratchet mechanism (not shown) including a gear and a pawl that controls the rotation of the rotation shaft 55a. The reflection member 58 includes a metal reflection plate main body 80 and a frame 58a for fixing the reflection plate main body 80. Both ends of the frame 58a are connected to the rotation shaft 55a. 8A shows a state in which the reflector main body 80 is removed from the frame 58a and stored in the storage unit 60 when the changing member is removed, which will be described later, and FIG. 8B shows the state reflected by the frame 58a. The state which attached the plate main body 80 is shown. Although not shown, the fixing means and the alarm means have the same configuration as that of the first embodiment and the second embodiment.

In the third embodiment, the configuration other than the changing member 55 and the adjusting member 56 is accommodated in the housing 59 of the in-vehicle alarm device 50. The changing member 55 has both ends of the frame 58a as the rotation shaft 55a. The adjustment member 56 can be disengaged between a locking projection (not shown) and a locking recess (not shown) provided on the housing 59. Can be separated from the housing 59. Further, the reflector main body 80 of the reflecting member 58 that is the reflecting means constituting the changing member 55 and the frame 58a are removed from the housing 59 and then stored in the storage member 60 when the changing member is removed. The storage unit 60 is located on the lower surface side of the housing 59. On the other hand, the patch antenna 57 is located on the upper surface side of the housing 59, and is installed so that the pattern surface 57 a is parallel to the upper surface 59 a of the housing 59. Here, the directivity of the patch antenna 57 is above the normal line of the pattern surface 57a (that is, the directivity is directed from the pattern surface 57a of the patch antenna 57 to the upper surface 59a of the housing 59). Therefore, the storage unit 60 is arranged so as to avoid the position having the directivity of the patch antenna 57 which is a receiving unit, and thus does not affect the microwave reception sensitivity. Moreover, when installing the housing | casing 59 of the vehicle-mounted alarm device 50 on a dashboard, it does not become a hindrance to the visual field ahead of a vehicle, and a vehicle-mounted alarm device can be reduced in size. Similarly, the adjustment member 56 is separated from the housing 59 by releasing the engagement between a locking projection (not shown) and a locking recess (not shown) provided in the housing 59. The state is stored in the adjustment member storage unit 61.

The frame 58a is provided with an attaching portion 58b for attaching the attaching convex piece 80a of the reflector main body 80. Therefore, the installation work of the reflector main body 80 can be completed simply by sticking the sticking convex piece 80a of the reflector main body 80 to the sticking portion 58b in consideration of the mounting angle of the reflector main body 80 in advance. A plate body 80 can be installed.

In the above-described third embodiment, the changing member 55 and the adjusting member 56 are used to change and finely adjust the reflection angle of the reflecting member 58, which is the reflecting means, with respect to the microwave. Instead of having the configuration of the adjustment member 56, the frame 58a may be integrated with the housing 59 at a predetermined angle. In this case, for example, if the reflecting surface of the reflector main body 80 is fixed so as to be inclined 22.5 degrees in a vertical posture and 67.5 degrees in a horizontal posture with respect to the vehicle traveling direction A, an in-vehicle alarm device The directivity for receiving microwaves of the receiving means in the vehicle front direction A in both the case where the 50 housings 59 are installed on the dashboard in a horizontal posture and the case where the housing 59 is installed in the vertical posture on the rear surface of the rearview mirror. It can be set as the structure which has.

Further, since the frame 58a is integrated with the housing 59 at a predetermined angle, the installation work of the reflector main body 80 can be completed simply by attaching the sticking convex piece 80a of the reflector main body 80 to the sticking portion 58b. The reflector main body 80 can be simply installed.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. Here, FIGS. 9 and 10 are configurations in which a mechanism capable of reflecting microwaves and display means for displaying alarm information are added to the configuration of FIG. 9 and 10, the components using the same word / phrase have a configuration succeeding the configurations of FIGS. 1 to 3 even if the reference numerals are different. In the in-vehicle alarm device 70 shown in FIG. 9, a first casing 71 and a second casing 72 are connected by a movable connecting portion 73. And it is installed in the vertical posture on the back surface of the rearview mirror 76 by a fixing member 72 a which is a fixing means provided in the second casing 72. On the other hand, the 2nd housing | casing 72 of the vehicle-mounted alarm device 70 shown in FIG. 10 is installed on the dashboard 78 by the fixing member 72a with the horizontal attitude | position.

The in-vehicle alarm device 70 shown in FIGS. 9 and 10 includes a display unit 74 that constitutes a display unit that displays alarm information on the first casing 71 based on the microwave received by the receiving unit. Yes. The display unit 74 can also be exemplified by a liquid crystal screen as an example of the display unit 74. Then, on the back side of the display surface of the display unit 74 inside the first housing 71, the reflection surface of the reflection plate 77 as a reflection means has a predetermined angle with respect to the display surface of the display unit 74. is set up. The reflection surface of the reflection plate 77 is a surface that does not face the back surface of the display unit 74 and reflects the microwave, and the patch antenna 75 having the pattern surface 75a on the upper surface 72a side of the second casing 72 receives the reflection surface. It is configured as possible. Accordingly, the predetermined angle of the reflection surface of the reflection plate 77 with respect to the display surface of the display unit 74 is an angle of less than 90 degrees (an angle at which the reflection surface of the reflection plate 77 is not parallel to the pattern surface 75a). In addition, it is set as the structure which can also display current position information as the content displayed on the display part 74 based on the information from the GPS receiver demonstrated in FIG. The second casing 72 is provided with a lamp and a speaker 79 which are alarm means for issuing an alarm based on microwaves in the direction of the first casing 71, and in a direction opposite to the first casing 71. A patch antenna 75 is provided as receiving means. Here, as shown in FIG. 9, the patch antenna 75 has a pattern surface 75 a of the patch antenna 75 when the second casing 72 of the in-vehicle alarm device 70 is installed in the vertical posture on the rear surface of the room mirror 76. Is provided on a surface on the vehicle traveling direction A side (a surface not on the room mirror side), and the normal line of the pattern surface 75a is parallel to the vehicle traveling direction A.

On the other hand, as shown in FIG. 10, when the second casing 72 of the in-vehicle alarm device 70 is installed in a horizontal position on the dashboard 78, the first casing is moved by the movable connecting portion 73 that is a changing means. The plane of the display unit 74 of the body 71 is fixed so as to be perpendicular to the upper surface of the second casing 72. Then, the reflecting surface of the reflecting plate 77 which is the reflecting means installed inside the first casing 71 is from the vertical direction perpendicular to the vehicle traveling direction A toward the patch antenna 75 which is the receiving means. It is inclined and arranged at a predetermined angle of less than 90 degrees. By arranging in this way, the directivity of the patch antenna 75 can be provided on the vehicle front direction A side, and the sensitivity to receive microwaves can be improved.

Here, the predetermined angle at which the reflecting plate 77 is inclined is determined in consideration of the size of the reflecting plate 77 and the patch antenna 75, the distance between the reflecting plate 77 and the patch antenna 75, and the reception sensitivity of the patch antenna 75. Further, the movable connecting portion 73 that is the changing means is provided with an adjusting member that is not shown, and the adjusting member allows the flat surface of the display unit 74 of the first housing 71 to be moved to the second housing. It is configured so that it can be fixed at an arbitrary angle in the range of 0 to 90 degrees with respect to the upper surface of the body 72.

Even in the case where the fixing member 72a, which is a fixing means provided in the second casing 72 shown in FIG. The plane of the display unit 74 of the housing 71 is configured to be fixed at an arbitrary angle in the range of 0 to 90 degrees with respect to the upper surface of the second housing 72. Therefore, for example, when the driver does not need to see the display on the display unit 74, the driver can fix the display unit 74 in a state where the display unit 74 is bent by 90 degrees so that the display unit 74 cannot be viewed. . In this state, when the driver looks at the rearview mirror, it is possible to prevent the display on the display unit 74 from getting into the eyes and getting in the way. Of course, when it is necessary to see the display on the display unit 74, the display unit 74 can be fixed at 0 degree (not bent) so that the display unit 74 can be viewed.

30, 40, 50, 70 Vehicle-mounted alarm device 31a, 41a, 78 Dashboard 31b, 41b, 76 Room mirror 32a, 32b, 72a Fixing member 33, 43 Microwave receiver 34, 44, 79 Lamp and speaker 35, 45 , 55 Change member 36, 46, 56 Adjustment member 37, 47, 57, 75 Patch antenna 39, 49, 59 Case 48, 58 Reflective member 71 First case 72 Second case 74 Display unit 77 Reflector 80 Reflector body

Claims (9)

Installation means for enabling installation in a vehicle in both a vertical posture and a horizontal posture;
Receiving means for receiving microwaves;
On-vehicle alarm device comprising alarm means for issuing an alarm based on the microwave received by the receiving means,
The receiving means is configured to have directivity for receiving the microwave in the vehicle forward direction in both the vertical posture and the horizontal posture ,
The on-vehicle alarm device characterized in that the installation means includes first fixing means for fixing to a rear surface of a rearview mirror in the vertical posture and second fixing means for fixing on the dashboard in the horizontal posture. The in-vehicle alarm device according to claim 1 , wherein the first fixing means and the second fixing means are configured as a common fixing surface for the rearview mirror and the dashboard. The receiving means needs to issue the alarm from a microwave emission source that should issue the alarm as a configuration in which the directivity for receiving the microwave is in the vehicle front direction in both the vertical attitude and the horizontal attitude. In a state where the receiving means is located at a certain distance away, the irradiation range of the microwave from the emission source is within the overlapping range of the half-value angle of the receiving means in the horizontal posture and the half-value angle of the receiving means in the vertical posture The in-vehicle alarm device according to claim 1, wherein the in-vehicle alarm device is included. Installation means for enabling installation in a vehicle in both a vertical posture and a horizontal posture;
Receiving means for receiving microwaves;
On-vehicle alarm device comprising alarm means for issuing an alarm based on the microwave received by the receiving means,
The directivity of the antenna included in the receiving unit is configured to be in the vehicle front direction in either the vertical posture or the horizontal posture, and in either the vertical posture or the horizontal posture different from the one. Changing means for changing the direction of incidence of the microwave on the antenna provided at a position having directivity of the antenna ;
A housing for storing a part other than the changing means in the receiving means is provided.
The in-vehicle alarm device characterized in that the changing means is configured to be removable and attached to the housing. The housing includes a changing unit removal storage unit that stores the changing unit when the changing unit is removed from the housing, and the changing unit removal storage unit has directivity of the antenna. The in-vehicle alarm device according to claim 4 , wherein the alarm device is disposed so as to avoid a position. The changing means is a reflecting means for reflecting the microwaves, claim 4, characterized in that the normal of the reflecting surface of the reflecting means has an arrangement having a predetermined angle with respect to the principal pointing direction of the antenna Or the vehicle-mounted alarm device of 5. The reflecting means is a reflecting plate,
The on-vehicle alarm device according to claim 6 , wherein the casing includes a pasting unit that pastes the reflecting plate at the predetermined angle. Based on the microwave received by the receiving means, an in-vehicle alarm device comprising display means for displaying alarm information,
The display means has a display surface, the reflection means is disposed on the back side of the display surface of the display means, and the reflection means and the display means are integrated with the housing by the adjustment means. The in-vehicle alarm device according to claim 6 , wherein the alarm device is mounted at a predetermined angle with respect to the vehicle-mounted alarm device. 9. The vehicle-mounted device according to claim 8 , wherein the reflection means has a reflection surface, and the display surface of the display means and the reflection surface of the reflection means are arranged at a predetermined angle. Alarm device.

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