JP2005138637A - On-vehicle equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an antenna as on-vehicle equipment without deteriorating antenna characteristic. <P>SOLUTION: A liquid crystal monitor 1 of an on-vehicle navigation device 1 having radio communication function is equipped with a mounting bracket 11 mechanically mounting the liquid crystal monitor 1 to a mounting stand 20. The mounting bracket 11 can be used in common as the antenna by using the mounting bracket 11 as the antenna for radiowave irradiation. Therefore, the antenna can be miniaturized without damaging appearance since the general antenna element operating only as the antenna is made redundant. Since the mounting bracket 11 operating as the antenna is exposed to the outside of the liquid crystal monitor, an excellent antenna characteristic is obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle-mounted device, and is suitable for application to a vehicle-mounted navigation device, for example.

  2. Description of the Related Art Conventionally, some in-vehicle navigation devices have a device body that is integrated with a liquid crystal monitor attached to the interior of a vehicle via a mounting stand, and a GPS antenna or the like is integrally formed on the mounting stand.

In this in-vehicle navigation device, an antenna that takes signals into the device main body and a sole plate of a mounting stand that supports the device main body are integrally formed, so that an antenna mounting plate is not required and the aesthetic appearance is excellent. In addition, the connection work between the antenna and the device main body is unnecessary (see, for example, Patent Document 1).
JP 2002-337618

  By the way, in the in-vehicle navigation device having such a configuration, the antenna and the sole plate of the mounting stand must be physically integrated, and the size of the mounting stand must be increased as a whole by the amount of the antenna. There is a problem that it is not possible to save space in a limited vehicle interior space for in-vehicle use.

  The present invention has been made in consideration of the above points, and intends to propose an in-vehicle device that can be miniaturized as an in-vehicle device without deteriorating antenna characteristics.

  In order to solve such a problem, in the present invention, an in-vehicle device having a wireless communication function includes a mounting bracket for mechanically mounting the in-vehicle device to a predetermined mounting target, and the mounting bracket is used for radio wave radiation. Use as an antenna.

  As a result, the mounting bracket can be shared as an antenna, so that the size of the mounting bracket that operates as an antenna can be reduced without sacrificing aesthetics by the amount that a normal antenna element that operates only as an antenna is unnecessary. Since it is exposed to the outside of the device, good antenna characteristics can be obtained.

  According to the present invention, since the mounting bracket can be used as an antenna, it is possible to reduce the size without impairing the aesthetics as much as a normal antenna element that operates only as an antenna is unnecessary, and to operate as an antenna. Since the metal fitting is exposed to the outside of the in-vehicle device, good antenna characteristics can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Configuration of Liquid Crystal Monitor In FIG. 1, reference numeral 1 denotes a liquid crystal monitor of a vehicle-mounted navigation device as a whole, which includes a front cover 2 made of a transparent acrylic resin and an LCD (Liquid Crystal Display) 3 for displaying images. A main board 4 on which an FM transmission circuit or the like (not shown) used as a transmission / reception circuit is mounted, and a back cover 6 made of resin for housing the LCD 3 and the main board 4 in a form sandwiched by the front cover 2 And is composed of.

  The main board 4 is provided with a lead wire 5 for outputting a high-frequency signal modulated based on an audio signal from the FM transmission circuit, and the lead wire 5 is provided on the inner side of the back cover 6. 7 through the through-hole 7 to the back side of the back cover 6.

  The liquid crystal monitor 1 displays a map on a screen based on map data read out and supplied from a storage unit such as a built-in hard disk and provides route guidance, or is received via a built-in TV tuner. TV images can be displayed on the screen.

  Further, the liquid crystal monitor 1 transmits a route guidance voice when performing route guidance and a TV voice when used as a TV monitor to a car stereo FM receiver (not shown) by a minute radio wave, and receives the FM reception. In some cases, route guidance sound and television sound are output from a car stereo speaker (not shown) via a machine.

  As shown in FIG. 2 and FIG. 3, the liquid crystal monitor 1 has a metal stopper 10 provided at the tip of the lead wire 5 led out to the back side of the back cover 6 through the holding portion 9. A screw 12 is sandwiched between a U-shaped mounting bracket 11 for fixing the monitor 1 to a mounting stand (not shown) and a two-stage recessed portion 13 provided on the back side of the back cover 6. It is made to be fixed by mounting.

  Here, the recess 13 has a structure in which two steps are provided as shown in FIG. 4, and is fixed in a state in which the mounting bracket 11 is in contact with a position one step higher than the bottom 6A. The structure has a contact surface 6B, and the mounting bracket 11 is fixedly attached to the contact surface 6B, whereby a gap 6C is generated between the mounting bracket 11 and the bottom 6A. It is made like that.

  As a result, the liquid crystal monitor 1 is attached to the liquid crystal monitor 1 and the mounting stand by inserting a thin plate-shaped mounting fixing plate 22 provided on the sole plate 21 of the mounting stand 20 as shown in FIG. 20 is fixed in a state of fitting.

  As a result, the liquid crystal monitor 1 is fixed to the mounting stand 20 as shown in FIG. 6, and the high frequency signal output from the FM transmission circuit of the main board 4 of the liquid crystal monitor 1 is attached to operate the lead wire 5 and the antenna. It can be radiated as a radio wave through the metal fitting 11.

(2) Operation and Effect In the above configuration, the liquid crystal monitor 1 attaches the mounting bracket 11 to the concave portion 13 provided on the back side of the back cover 6, and via the FM transmission circuit and the lead wire 5 of the main board 4. By connecting electrically, the mounting bracket 11 can be used not only for mounting on the mounting stand 20 but also as an antenna.

  Thereby, the liquid crystal monitor 1 does not have a dedicated antenna having a function only of the antenna, but also uses the mounting bracket 11 which is essential for mechanically mounting and fixing the back cover 6 and the mounting stand 20 as the antenna. As a result, it is possible to save space as compared with a case where only a normal antenna is attached alone, and it is possible to eliminate the inconvenience of impairing the aesthetic appearance.

  Further, the liquid crystal monitor 1 uses the mounting bracket 11 provided on the back side of the back cover 6 as an antenna, so that an antenna is provided inside the storage space created by the front cover 2 and the back cover 6. In addition, the electromagnetic radiation from the antenna is not absorbed by a shield plate (not shown) for preventing unwanted radiation that is located at a short distance, and sufficient electric field strength cannot be maintained, and the antenna directivity changes. Inconveniences such as this can be avoided in advance.

  The device body in the conventional in-vehicle navigation device is for receiving and capturing radio waves from a GPS satellite as a GPS antenna, whereas in the liquid crystal monitor 1 of the present invention, the mounting bracket 11 is used for voice transmission. Since it is mainly intended for use as an antenna, it is particularly effective in preventing harmful effects such as a decrease in electric field strength and a change in directivity caused by housing the antenna in the liquid crystal monitor 1. Sound can be reliably output from the machine via the speaker.

  Furthermore, since the mounting bracket 11 and the mounting fixing plate 22 of the mounting stand 20 are mechanically fixed and electrically connected to the liquid crystal monitor 1, the mounting fixing plate 22 of the mounting stand 20 is also used as an antenna. It can be operated, and the electrical length can be made longer than using only the mounting bracket 11 alone as an antenna.

  According to the above configuration, the liquid crystal monitor 1 can be used not only for mounting the mounting bracket 11 provided on the back side of the back cover 6 to the mounting stand 20 but also as an antenna. As a result of positioning the antenna on the outside of the liquid crystal monitor 1, it is possible to save space without impairing the aesthetics, and to prevent the deterioration of the antenna characteristics in advance, and reliably output the sound from the car stereo speaker. be able to.

(3) Other Embodiments In the above-described embodiment, the case where the U-shaped mounting bracket 11 is used has been described. However, the present invention is not limited to this, and the mounting bracket 20 is attached to the mounting stand 20. You may make it use the attachment metal fitting which consists of various shapes according to a structure.

  In the above-described embodiment, the case where the FM transmission circuit for outputting a high-frequency signal is attached to the main board 4 has been described. However, the present invention is not limited to this, and the AM board and the like other than the main board 4 are also provided. Various transmission circuits may be attached.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to the liquid crystal monitor 1 of the navigation system has been described. However, the present invention is not limited to this, and is compatible with a car audio and an automatic toll payment system for highways. The present invention may be applied to various other in-vehicle devices such as the ETC unit.

  The in-vehicle device of the present invention can be applied to various uses for emitting radio waves from an in-vehicle device via an antenna, for example.

It is a rough-line perspective view which shows the structure of the liquid crystal monitor of this invention. It is a basic diagram which shows the structure of a back cover and a mounting bracket. It is a basic diagram with which it uses for description of the lead wire guide | induced to the outer side of a back cover. It is a rough-line perspective view which shows the structure of a recessed part. It is a rough-line perspective view with which it uses for description at the time of attachment of a liquid crystal monitor and an attachment stand. It is an approximate line sectional view showing the state where the liquid crystal monitor was attached and fixed to the attachment stand.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... LCD monitor, 2 ... Front cover, 3 ... LCD, 4 ... Main board, 5 ... Lead wire, 6 ... Back cover, 7 ... Convex part, 10 ... Fixing bracket, 11 ... Mounting bracket, 12 ... screw, 13 ... recess, 20 ... mounting stand, 21 ... sole plate, 22 ... mounting fixing plate.

Claims (3)

In in-vehicle equipment with wireless communication function,
A mounting bracket for mechanically mounting the in-vehicle device to a predetermined mounting target;
An in-vehicle device, wherein the mounting bracket is used as an antenna for radio wave radiation. The in-vehicle device is a display,
The in-vehicle device according to claim 1, wherein the mounting bracket is provided on the display itself for mechanically connecting the display and a mounting stand for holding the display. The mounting bracket is characterized in that the mounting stand also operates as an antenna by mechanically and electrically connecting the display and a mounting stand made of a conductive member that holds the display. The vehicle-mounted device according to 1.

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