JPH08293690A - On-board electronic apparatus - Google Patents

Abstract

PURPOSE: To shield with a dust cover to avoid leaking the noise to outside through a memory medium insert hole. CONSTITUTION: An electronic apparatus comprises a CD-ROM unit 21 to read map information stored in a CD inserted from an opening 211, center control unit 22 to process information about the running route of a vehicle according to this information read by the unit 21 and dust cover 214 covering the opening 211 (213a) to avoid entering dust therefrom. The cover 214 is made of conductive material and electrically connected to a cabinet 211 made of conductive material for the unit 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted electronic device such as a navigation system. For example, a dust-proof cover having an opening for inserting a CD into a CD-ROM unit has a shield function to effectively suppress noise generated inside. It is designed to be shielded.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view of a navigation system body used in a navigation system. The navigation system includes a navigation system main body 10 shown in FIG. 9, a monitor (not shown) that displays various types of information regarding the travel route of the vehicle, a GPS antenna (not shown) that detects the position of the vehicle, and the like. The navigation system body 10 also includes a CD-ROM unit 11 having an opening 11a for inserting a CD.
And an electronic circuit 12 that calculates various information regarding the traveling of the vehicle based on the map information read by the CD-ROM unit 11 and outputs the information to the monitor.

In FIG. 9, reference numeral 13 is an escutcheon made of a resin material provided on the front surface of the CD-ROM unit 11, and 14 is a dustproof cover made of a resin material which is openably and closably connected to the escutcheon 13 by a hinge to cover the opening 11a. is there. For CD, open this dustproof cover 14 and open it 1
1a is exposed and inserted / removed. Normally, the dust cover 14 is closed to prevent dust and dirt from entering.

The CD-ROM unit 11 and the electronic circuit 12
Generates high frequency noise. Therefore, conventionally, CD
-The ROM unit 11 and the electronic circuit 12 are placed at a location apart from other vehicle electronic devices, such as a trunk room or a floor of a vehicle compartment, to prevent the influence of noise. Alternatively,
When it was necessary to mount it in close proximity to other vehicle electronic devices, it was necessary to shield the entire navigation system with another shield cover.

An object of the present invention is to provide an on-vehicle electronic device in which noise is shielded so as not to leak outside from the insertion port of the storage medium.

[0006]

The present invention will be described with reference to FIGS. 1 and 2 showing an embodiment.
The reading device 21 that receives the storage medium inserted from the device and reads the stored information, and the opening 211 (2a) so that dust and dirt do not enter through the opening 211 (213a).
13a) is applied to a vehicle-mounted electronic device including a dustproof cover 214. The above-described object is achieved by making at least a part of the dustproof cover 214 from a conductive material and electrically connecting the dustproof cover 214 to the housing 211 made of a conductive material of the reading device 21. . In the invention of claim 2, the reading device is a CD-ROM unit 21. According to the invention of claim 3, the dustproof cover 214 is mounted on the CD by the screw 215 made of a conductive material.
-It is fixed to the casing 211 of the ROM unit 21. The invention according to claim 4 is a CD- which receives a CD inserted from the opening 211 and reads the stored map information.
A ROM unit 21 and a navigation system electronic circuit 22 for calculating information about a traveling route of the vehicle based on the map information read by the CD-ROM unit 21;
Dust-proof cover 2 that covers the opening 211 (213a) to prevent dust and dirt from entering through the opening 211 (213a).
It is applied to a vehicle-mounted navigation system including Then, at least a part of the dustproof cover 214 is made of a conductive material, and the dustproof cover 214 is attached to the CD-ROM.
The above-mentioned object is achieved by electrically connecting the unit 21 or the casing 211, 221 made of a conductive material of the electronic circuit 22. The invention of claim 5 is the dustproof cover 2
14 by a screw 215 made of an electrically conductive material
It is fixed to the casing 211 of the M unit 21. The invention of claim 6 refers to FIGS.
4 is attached so that it can be opened and closed, and the electronic circuit 2
The second housing 221 is provided with connecting portions 224a and 224b that elastically engage with each other to electrically connect.

[0007]

The opening 211 of the reader 21 such as a CD-ROM unit is covered with a dustproof cover 214 to prevent dust and dirt from entering the inside. In addition, this dust cover 2
Reference numeral 14 has conductivity and is electrically connected to the conductive housing 211 or 221 of the reading device 21 or the like, and therefore shields noise generated inside. Claim 6
The dustproof cover 224 is electrically connected to the housing 221 of the electronic circuit 22.

Incidentally, in the section of means and action for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0009]

1 and 2 show a first embodiment in which an on-vehicle electronic device according to the present invention is applied to a navigation system. Reference numeral 20 denotes a navigation system body, and in this embodiment, a CD-ROM unit 21 and
Based on the map information read by the CD-ROM unit 21, a center control unit 22 that calculates various information related to the traveling route of the vehicle and outputs it to the monitor, and a horizontal plane that works on the vehicle to calculate the traveling direction of the vehicle And an optical fiber gyro unit 23 for detecting the angular velocity of the. The navigation system body 20 is fixed to the vehicle body by brackets 24 and 25 made of a conductive material, whereby the casings of the CD-ROM unit 21, the center control unit 22 and the optical fiber gyro unit 23 are electrically connected to the vehicle body. Connected to.

The center control unit 22 is a CP
U, ROM, RAM, and other peripheral devices that generate noise from themselves, but are entirely conductive
21, and the housing 221 to the vehicle body with the bracket 24 as described above. , 25 is grounded, so there is no risk of noise leaking to the outside. Further, the optical fiber gyro unit 23 is mainly composed of a gyro type angular velocity meter and does not generate noise from itself.

As is well known, the CD-ROM unit 21 has an opening 211 for inserting a CD (compact disc) storing map information therein, a drive unit (not shown) for rotationally driving the CD, and information about the CD. And a control circuit unit (not shown) for supplying information read by the reading unit to the center control unit 22 and controlling the drive of the drive unit, and is entirely of a conductive casing. Body 2
It is covered with 12.

An escutcheon 213 made of a resin material is provided on the front surface of the CD-ROM unit 21. The escutcheon 213 is a CD-ROM 21
An opening 213a is provided through which the CD is inserted, and the CD can be inserted along the opening 213a without damaging the CD. Escussion 2
A dust-proof cover 21 made of a conductive material is provided on the front surface of 13.
4 is provided to cover the openings 211 and 213a. A lock dial 215 is integrally provided on the dustproof cover 214 by a retainer ring 216. The lock dial 215 is made of a conductive material, and a male screw 215 a at the tip thereof is formed on the front surface of the housing 212.
The dust-proof cover 214 is electrically connected to the housing 212 by the lock dial 215.

In the navigation system thus constructed, of the noise generated from the CD-ROM unit 21, the parts other than the front surface of the CD-ROM 21 are shielded by the conductive casing 212, and the front surface thereof is the conductive dustproof cover 214. Because it is shielded by, CD through the opening 211
-No noise leaks to the outside of the ROM 21. Therefore, even if the navigation system body 20 has to be installed near other vehicle-mounted electronic devices, the CD-R
It is possible to prevent the influence of noise generated from the OM unit 21 on other electronic devices. As a result, there is no need to restrict the installation location of the navigation system body 20 or cover the navigation system body 20 with another shield cover as in the conventional case.

For a CD, loosen the lock dial 215 and remove the dustproof cover 214 to remove the escutcheon 21.
The third opening 213a is exposed and inserted into the CD-ROM 21.

A second embodiment in which the vehicle-mounted electronic device according to the present invention is applied to a navigation system will be described with reference to FIGS. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and differences will be mainly described. Reference numeral 224 denotes the dustproof cover of the second embodiment, which is made of a conductive material as in the first embodiment. As well shown in FIG. 4, bearing portions 224d are provided at both lower end portions of the dust cover 224, and the bearing portion 224d can be rotated at a rotating fulcrum portion 223b provided at both lower end portions of the escutcheon 223. A dustproof cover 224 is provided on the front surface of the escutcheon 223 so as to be opened and closed.

In FIGS. 5 to 7, the upper edge of the dustproof cover 224 is bent inward over its entire length, and inserting ears 224a are formed at two left and right sides of the upper edge extending further inward. A connecting piece 224b is provided on the upper surface of the insertion ear 224a so as to be elastically deformable by being bent upward as shown in FIG. An insertion portion 223b is provided at a corresponding portion of the escutcheon 223, and when the dustproof cover 224 is closed, the tip of the insertion ear portion 224a is inserted into the insertion portion 223b.
The upper surface of the connection piece 224b of the plug-in ear portion 224a is elastically coupled to the front end lower surface 221a of the housing 221 of the electronic device 22, whereby the dustproof cover 224 is electrically connected to the housing 221.

In FIG. 8, a locking piece 224c is provided at the center of the upper edge of the dustproof cover 224, while a locking projection 223c for locking the locking piece 224c is provided at the corresponding portion of the escutcheon 223. ing. By locking the locking piece 224c to the locking protrusion 223c, the dustproof cover 2
24 is held in escutcheon 223 in its closed position. If the dustproof cover 224 is pulled toward you, the rotation support part 22
It can be opened downward and forward around 3b.

Also in this second embodiment, the CD-RO is used.
The CD insertion port 211 of the M21 is covered with a dustproof cover 224 made of a conductive material, and the dustproof cover 224 is inserted into the ear 2
24a and the connecting piece 224b are electrically connected to the housing 221 of the center control unit 22.
It is possible to prevent noise generated inside the OM 21 from leaking to the outside. The CD is inserted and removed by rotating the dust cover 224 to expose the opening 223a.

Although the present invention has been described above with respect to a navigation system, the present invention is not limited to a navigation system. Further, although the dust cover for covering the CD insertion opening of the CD-ROM unit 21 has been particularly described, a compact disc device for music (CD device), a compact disc device for information retrieval (CD-ROM device),
Alternatively, the present invention can be similarly applied when an MD device, a magneto-optical recording device, or the like is used as an on-vehicle electronic device. That is, the present invention can be applied to all devices as long as the device is a vehicle-mounted electronic device in which a storage medium is taken in and out from an insertion opening and has a dustproof cover. Furthermore, the dustproof covers 214 and 224 need only be able to achieve the noise shield effect, and it is not necessary to make the entire dust-proof cover with a conductive material, and at least a part thereof may be made with a conductive material.

In the above embodiment, the CD-RO
M21 is the reading device and the center control unit 2
Reference numeral 2 constitutes an electronic circuit, lock dial 215 constitutes a screw, and insertion ear 224a and connecting piece 224b constitute a connecting portion.

[0021]

According to the present invention, in a reading device such as a CD-ROM unit, noise is shielded by covering the insertion opening of a storage medium such as a CD with a dustproof cover made of a conductive material. There is no noise leakage from the insertion opening, and it is not necessary to take special measures against noise even in a layout where other vehicle-mounted electronic devices are mounted near the reader.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment in which an in-vehicle electronic device according to the present invention is applied to a navigation system.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view showing a second embodiment when the vehicle-mounted electronic device according to the present invention is applied to a navigation system.

FIG. 4 is an enlarged view showing a rotating mechanism of the dustproof cover.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is an enlarged perspective view of a main part of the dustproof cover and the escutcheon of FIG.

FIG. 7 is a cross-sectional view showing an electrical connection structure between a dust cover and an electronic circuit housing.

FIG. 8 is a cross-sectional view showing the engagement relationship with the escutcheon at the closed position of the dustproof cover.

FIG. 9 is a perspective view illustrating a conventional navigation system body.

[Explanation of symbols]

 20 navigation system main body 21 CD-ROM unit 22 center control unit 23 optical fiber gyro unit 211, 213a CD insertion opening 212, 221 housing 213, 223 escutcheon 214, 224 dustproof cover 215 lock dial 224a insertion ear 224b connecting piece 224c engagement Stop

Claims (6)

[Claims] 1. A storage medium is inserted through the opening,
In a vehicle-mounted electronic device comprising a reading device for reading stored information and a dustproof cover for covering the opening so that dust and dust do not enter through the opening, at least a part of the dustproof cover is made of a conductive material. An electronic device for a vehicle, wherein the dust-proof cover is electrically connected to a casing made of a conductive material of the reading device. 2. The on-vehicle electronic device according to claim 1, wherein the reading device is a CD-ROM unit. 3. The in-vehicle electronic device according to claim 2, wherein the dust-proof cover is fixed to the casing of the CD-ROM unit with a screw made of a conductive material. . 4. A CD-ROM unit which receives a CD inserted from an opening and reads stored map information, and information about a traveling route of a vehicle is calculated based on the map information read by the CD-ROM unit. In a vehicle-mounted navigation system including an electronic circuit for a navigation system and a dustproof cover that covers the opening so that dust and dust do not enter through the opening, at least a part of the dustproof cover is made of a conductive material, and the dustproof cover is provided. Is electrically connected to the CD-ROM unit or a housing made of a conductive material of the electronic circuit. 5. The vehicle-mounted electronic device according to claim 4, wherein the dustproof cover is fixed to the casing of the CD-ROM unit with a screw made of a conductive material. 6. The navigation system according to claim 4, wherein the dust-proof cover is attached so as to be openable and closable, and its pivoting tip end is elastically engaged with the casing of the electronic circuit to electrically connect the casing. An in-vehicle electronic device having a connection portion.