JP2002134974A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep operation characteristics of a rotating drive mechanism, a circuit, etc., in a stable state against large temperature variation. SOLUTION: A housing 3 is equipped with at least a rotating drive mechanism 11 for an information recording medium 2, a heat generating electronic component 24, a temperature detecting means 23, and a cooling means 27. The rotating drive mechanism 11 has its temperature raised by the heat generating electronic component 24 and the temperature detecting means 23 detects the temperature in the housing. When the temperature is higher than specified, the cooling means 27 cools it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a relatively wide temperature environment from a high temperature to a low temperature, such as a car navigation device, a portable telephone, and a portable audio device, and a disk-shaped recording medium is provided inside a housing. The present invention relates to a rotary drive mechanism for driving the electronic device and an electronic device including an electronic component such as a power supply circuit element and a microprocessor having a relatively large heat generation amount.

[0002]

2. Description of the Related Art Car navigation systems, for example, are becoming increasingly popular due to lower prices or improved functions and operability. Also, the car navigation device is
Automatic Toll Collection System (ETC: _{Electronic Toll)
Collection System} ), emergency call service, etc., and the next generation mobile communication system, such as Internet connection function, etc. ing.

In a car navigation system, a multi-function optical disk (DVD-RO) having a high storage capacity capable of recording information of several light disks according to a specification for obtaining digital map information from an optical disk (CD-ROM).
M) is also provided. In the car navigation device, a disc player is built in the device main body to reproduce these optical discs, and the above-described various optical discs are loaded, and the recorded information is read and displayed on a monitor. .

In a car navigation system, not only the above-mentioned read-only optical disk, but also a recordable optical disk (CD-R), a multifunctional optical disk (DVD-RAM) or a hard disk capable of writing information. Use is also being considered. Further, in a car navigation device, use of a small memory card capable of recording information of several megabytes to about 100 megabytes is being studied.

[0005]

However, since the car navigation system is mounted on a vehicle having a large environmental change, it needs to operate stably even in a wide temperature range from a low temperature to a high temperature. Is done. When the car navigation device is used in a cold region, the grease characteristics of the rotating shaft of the disc player may be degraded, smooth rotation may be suppressed, and a phenomenon such as surface runout may occur. Therefore, in the car navigation device, for example, it is considered that a heater is built in as a specification for a cold region, and that a measure is taken to warm the rotating shaft when the temperature becomes lower than a predetermined temperature. However, the car navigation device has a problem in that the power consumption increases.

On the other hand, a car navigation device includes electronic components and the like that generate heat, such as a power supply circuit element and a microprocessor. Heat generated from these components due to long-time use or the like is trapped inside the housing. May be hot. When the car navigation device is used in summer or in a tropical area, the inside of the housing becomes hot. The car navigation device has a problem in that the operation of the circuit components and circuit elements becomes unstable due to the high temperature inside the housing.

Accordingly, the present invention has been proposed with the object of providing an electronic device in which the operating characteristics of a rotary drive mechanism, circuits, and the like are maintained in a stable state even with a large temperature change. .

[0008]

An electronic apparatus according to the present invention that achieves the above-mentioned object has at least a rotation drive mechanism for an information recording medium, a heat-generating electronic component, a temperature detecting means, Means are provided. In the electronic device, the rotation drive mechanism is maintained in a heated state by the heat generated by the heat-generating electronic components, and the temperature state in the housing is detected by the temperature detecting means, and when the temperature exceeds a predetermined temperature, cooling by the cooling means is performed. It is composed of

[0009] Further, the electronic apparatus has at least a rotation drive mechanism for an information recording medium and a heat-generating electronic component inside a housing. The electronic device is configured such that the rotary drive mechanism is heat-transfer-coupled to the heat-generating electronic component, is disposed in the housing, and is heated by the generated heat.

According to the electronic apparatus of the present invention having the above-described structure, the rotary drive mechanism is maintained in a heated state by the heat generated by the heat-generating electronic components, so that the temperature can be reduced without providing a heating means such as a heater. Even under the conditions, the deterioration of the lubrication characteristics of the rotating shaft is suppressed, and the rotating shaft is stably driven by the low driving torque, so that the power consumption is reduced. Further, according to the electronic device, when the temperature in the housing becomes equal to or higher than a predetermined temperature under long-term use or high-temperature conditions, the cooling unit is driven by the detection output of the temperature detection unit to perform cooling. In addition, the operation of electronic components, circuit elements, and the like is stabilized, and the viscosity of the lubricant filled in the rotating shaft of the rotary drive mechanism is appropriately maintained, so that the lubricant is prevented from scattering inside. Therefore, in the electronic device, a stable operation is performed even with a large temperature change.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a car navigation device 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. The car navigation device 1 is shown in FIG.
As shown in FIG. 2, the apparatus comprises a device main body 3 on which a disk 2 on which map information and other appropriate information is recorded, a monitor 4, a speaker 5, and a remote controller 40. Further, the car navigation apparatus 1, the position information and G. P. S. in order to obtain the azimuth information wirelessly (GPS: _{Global Positioning S
ystem} ). An antenna and a direction sensor 7 are provided.

The car navigation device 1 includes a device body 3
The power supply unit 8 is connected to a terminal box or a cigar lighter of a car on which the power supply unit 8 is mounted, and power is supplied to each unit of the apparatus main body 3, the monitor 4, and the like. In the car navigation device 1, for example, the device body 3 is installed in a lower space between a seat and a floor or in a trunk, and a monitor 4 is installed on a dashboard. The car navigation device 1 is G
A PS antenna is attached to the rear tray and trunk lid.

As shown in FIG. 1, a car navigation apparatus 1 is loaded with a disc 2 such as an optical disc, a multi-purpose optical disc, or a music disc on which map information or version-up information is recorded from a slot 3a provided in the apparatus main body 3. You. As described later, information recorded on the disc 2 by the disc player 11 is reproduced and stored in the map data memory unit 12. The car navigation device 1 has a route guidance function to the destination,
GPS reception unit and traffic information service (VIC
S: _{Vehicle Information and Communication System} )
, A receiving unit 6 for FM text multiplex broadcasting for providing news, weather forecast, traffic information and the like, a voice recognition unit, and the like.

The car navigation device 1 is provided with a direction sensor 7 for obtaining direction information from current position information. Although details are omitted, the car navigation device 1 is provided with an operation unit for setting a destination and the like on the monitor 4 similarly to the remote controller 40. The destination data generation unit is operated by operating each operation unit. 4
At 1, destination data is generated. In the car navigation device 1, a route map to the destination is displayed on the monitor 4, and voice guidance is also provided by the speaker 5. The car navigation device 1 includes a speaker 5
Also, audio output of a music disc or the like is performed.

As shown in FIG. 2, the apparatus main body 3 includes a current position detecting unit 9, a route information generating unit 10, a map data memory unit 12, and a route map data generating unit 13. The apparatus body 3 includes an image processing unit 14, a guidance information memory unit 15, a voice guide processing unit 16, and a voice synthesis unit 1.
7 is provided. Each unit described above is configured by a microcomputer including a CPU, a ROM, or a RAM. The current position detector 9 detects the current position based on information from the receiving unit 6 and the direction sensor 7. The route information generation unit 10 receives the current position information from the current position detection unit 9, the destination data information generated by the destination data generation unit 41 by operating the remote controller 40, and the map data from the map data memory unit 12. Is entered.

As described above, the map data memory section 12 stores the recording information of the disk 2 loaded on the apparatus main body 3 and reproduced by the disk player 11. The map data memory unit 12 stores the stored information in the route information generation unit 1
0, and also to the route map data generator 13. The route map data generation unit 13 generates route map data based on information supplied from the route information generation unit 10 and the map data memory unit 12, and generates an image processing unit 14.
To supply. The route map data generator 13 feeds back the generated route map data to the map data memory 12 and stores it as additional information.

The image processing unit 14 creates image data from the supplied route map data and supplies the created image data to the monitor 4 to display an image. Guidance information is stored in the guidance information memory unit 15, and predetermined guidance information data is supplied to the voice guidance processing unit 16 based on the route information generated by the route information generation unit 10. Voice guide processing unit 16
Is supplied with the current position information from the current position detection unit 9, processes the guidance information data described above, and instructs the voice synthesis unit 17 to generate a voice guide. Voice synthesis unit 17
Synthesizes a predetermined voice guide and generates a voice guide processing unit 16
The voice guidance according to the display image on the monitor 4 is output from the speaker 5 via the voice guidance processing unit 16.

Of course, the car navigation system 1 is not limited to the above-described configuration, and the output from each component is also a representative example. In the car navigation device 1, for example, the monitor 4 may be incorporated in a console box, or may be used as an audio device. The car navigation device 1 may be provided with, for example, a television broadcast or radio broadcast receiving function.

The disk player 11 is assembled on a mounting board 18 provided on the apparatus main body 3, and is provided on a motor 19, a rotating shaft 20 driven by the motor 19, and the rotating shaft 20 as is well known. And a rotary drive mechanism including a disk table 21 and the like. The disc player 11 is moved from the slot 3a
The disk 2 loaded therein is mounted on the disk table 21 and driven to rotate. The disc player 11 reproduces various information recorded on the disc 2 by the optical pickup 22, or records information on the disc 2.

As shown in FIG. 1, the apparatus main body 3 is provided with a temperature sensor 23 for detecting the internal temperature. An electronic component 24 is mounted on a printed circuit board 25 and is incorporated therein. In the apparatus main body 3, a ventilation port 26 is provided in the housing, and a cooling fan 27 is incorporated in the ventilation port 26. The operation of the cooling fan 27 is controlled by a fan control unit 29 connected to the power supply unit 8 via a switch 28 that is opened and closed by a temperature sensor 23 as shown in FIG.

By the way, the car navigation device 1
It is mounted on vehicles and used in a wide range of temperature conditions from cold regions to the tropics. In the car navigation device 1, the inside of the device main body 3 may become abnormally high due to the heat generated from the heat-generating electronic components 24 together with the outside air temperature in a tropical area or the like. Each of the above-described parts performs a stable operation by being maintained in a proper temperature environment. The car navigation device 1 is provided with a disk player 11 for reproducing information recorded on the disk 2 loaded as described above or recording information. In the car navigation device 1, by adopting a configuration described in detail later, the lubricant filled in the rotating shaft 20 of the disk player 11 is hardened even in a cold region, and smooth rotational driving is suppressed, and the disk 2 A phenomenon such as surface runout is prevented from occurring.

In the car navigation device 1, when the internal temperature of the device body 3 becomes higher than a predetermined temperature and the state is detected by the temperature sensor 23, a detection signal is output from the temperature sensor 23 to the switch 28. You. In the car navigation device 1, the switch 28 is closed by this detection signal, power is supplied to the fan control unit 29, and the cooling fan 27 is rotationally driven via the fan control unit 29. In the car navigation device 1, when the cooling fan 27 is driven, the high-temperature air in the device main body 3 is discharged to the outside through the ventilation port 26 to perform the internal cooling.

In the car navigation device 1, when the temperature inside the device main body 3 becomes lower than a predetermined temperature and the temperature sensor 23 detects the state, the temperature sensor 23 outputs a detection signal to the switch 28. In the car navigation device 1, the switch 28 is opened by this detection signal, and the fan control unit 29
By stopping the power supply of the cooling fan 27, the rotation operation of the cooling fan 27 is stopped. Therefore, the car navigation device 1
In, the internal temperature of the apparatus main body 2 is kept constant, and the operation of each part is kept in a stable state. In the car navigation device 1, power consumption is reduced by driving the cooling fan 27 only when it is necessary.

The car navigation system 1 is not limited to the cooling structure described above. For example, as shown in FIG. 4, the temperature sensor 23 and the switch 28 are shared, and a plunger 30 whose operation is controlled by opening and closing the switch 28 is provided. ,
A cooling structure having a shutter 31 driven by the plunger 30 may be provided. The shutter 31 is slidably provided on the inner surface of the apparatus main body 3,
The vent 2 is driven by the plunger 30.
Open and close 6.

In the car navigation system 1, the ventilation port 26 is normally closed by the shutter 31.
In the car navigation device 1, when the temperature inside the device main body 3 becomes abnormally high and the state is detected by the temperature sensor 23, a detection signal is output from the temperature sensor 23 and the switch 28 is closed. In the car navigation device 1, power is supplied to the plunger 30, the shutter 31 slides to open the ventilation port 26, and the high-temperature air in the device body 3 is released from the ventilation port 2.
It is discharged to the outside via 6 and the internal cooling is performed.

In the car navigation device 1, when the internal temperature of the device body 3 becomes lower than a predetermined temperature and the temperature sensor 23 detects the state, the temperature sensor 23 outputs a detection signal to the switch 28. In the car navigation device 1, the switch 28 is opened by this detection signal and the power supply to the plunger 30 is stopped, so that the shutter 31 returns to the initial position by the elastic force of a spring (not shown), and the ventilation port 26 is opened. Closed. Therefore, in the car navigation device 1, the internal temperature of the device main body 2 is kept constant, and the operation of each part is kept in a stable state. In the car navigation device 1, power consumption is reduced by driving the plunger 30 only when necessary.

The car navigation system 1 may be provided with a cooling / heating structure comprising a changeover switch 32 opened and closed by a temperature sensor 23 and a Peltier element 33 as shown in FIG. The changeover switch 32 includes a first switch 32a and a second switch 32b connected in series between the Peltier element 33 and each pole of the power supply 8, and a connection pole between the first switch 32a and the second switch 32b. Instead, the third switch 32c and the fourth switch 32d are connected in series between the Peltier element 33 and each pole of the power supply 8, respectively. The changeover switch 32 performs a switching operation of each of the switches 32a to 32d by a detection signal from the temperature sensor 23 that detects the internal temperature of the apparatus main body 3,
Current is supplied to the Peltier element 33 in different directions. The Peltier element 33 is an element in which dissimilar metals 33a and 33b are joined, and a heat generating action or a heat absorbing action is caused by a Peltier effect on the joining surface according to the direction of the supplied current.

For example, when the internal temperature of the car body 3 exceeds a certain temperature and the state is detected by the temperature sensor 23, the car navigation apparatus 1
Outputs a detection signal to the changeover switch 28, and the switching operation is performed. FIG. 5 shows a car navigation device 1.
, The first switch 32a and the second switch 32b are closed and the third switch 32c and the fourth switch 32d are opened.
Is performed. In the car navigation device 1, a clockwise current is supplied to the Peltier device 33 in the figure, and a heat absorption phenomenon occurs at the joint surface between the dissimilar metals 33 a and 33 b, thereby cooling the device body 3. .

In the car navigation device 1, for example, when the internal temperature of the device main body 3 becomes lower than a predetermined temperature and the state is detected by the temperature sensor 23, a detection signal is sent from the temperature sensor 23 to the changeover switch 28. It is output and the switching operation is performed. Car navigation system 1
FIG. 5 shows a switching operation of the changeover switch 28 in which the first switch 32a and the second switch 32b are opened and the third switch 32c and the fourth switch 32d are closed. State. In the car navigation device 1, a current is supplied to the Peltier element 33 in the counterclockwise direction in FIG.
A heat generation phenomenon occurs at the joint surfaces a and 33b, so that the apparatus main body 3 is heated.

The car navigation system 1 may be provided with a cooler 34 in which a phase-change cooling medium 35 is filled as shown in FIG. The cooler 34 is disposed, for example, between the printed board 25 on which the heat-generating electronic components 24 are mounted and the mounting board 18. The phase-change cooling medium 35 has a characteristic that it is in a solid phase state up to a certain temperature, such as water, and changes into a liquid phase when the temperature is exceeded. The phase-change cooling medium 35 has a small thermal conductivity in a solid phase state, but becomes convective inside the cooler 34 by exceeding a melting point and being in a liquid phase state, thereby increasing the thermal conductivity. .

In the car navigation device 1, when the internal temperature of the device body 3 exceeds a certain temperature, the phase change cooling medium 35 changes its phase from a solid phase to a liquid phase, thereby generating heat from the heat-generating electronic components 24 and the device body. 3 to the mounting board 1
8 efficiently. In the car navigation device 1, although not shown, heat radiating means such as a heat sink and a heat radiating plate are provided on the mounting board 18, and heat is radiated through these heat radiating means so that the inside of the device main body 3 is cooled. To

The car navigation system 1 is provided with the heat-generating electronic components 24 as described above, and is configured to use the heat generated from the heat-generating electronic components 24 to maintain the disk player 11 in a heated state. ing.
In the car navigation device 1, the disk player 11 is maintained in a heated state, so that the lubricant filled in the rotating shaft 20 is hardened even when the internal temperature of the device body 3 becomes low in a cold region or the like. As a result, smooth rotational drive is suppressed, and the inconvenience of occurrence of a phenomenon such as surface runout on the disk 2 is avoided.

Therefore, in the car navigation system 1, power consumption can be reduced by eliminating the need for a heater for heating the disc player 11. In addition,
The car navigation device 1 may be provided with a heater for heating the disc player 11, but this heater does not operate at all times and assists when sufficient heat cannot be generated by the heat generated by the heat-generating electronic components 24. It is used as a strategic means.

As shown in FIG. 7, in the car navigation apparatus 1, a motor 19 of the disc player 11 is mounted on a mounting board 18, and the motor 19 mounts a disc table 21 on which the disc 2 is mounted. The rotating shaft 20 is driven to rotate. The car navigation device 1 includes a heat generating electronic component 2 on a printed circuit board 25.
4 is mounted, and is characterized in that the heat-generating electronic components 24 are arranged close to the disc player 11 in a substantially parallel state. In the car navigation device 1, the heat generated from the heat-generating electronic components 24 is radiated to the disk player 11 arranged in close proximity to heat it.

In the car navigation system 1, the disk player 11 and the heat-generating electronic components 24 are not limited to the above-described arrangement in a substantially parallel state. For example, as shown in FIG. It may be located just below the player 11. That is,
In the car navigation device 1, a motor 19 is mounted on a bottom surface of a mounting board 18, and a rotation axis 20 of the motor 19 is mounted on the mounting board 1.
8 and is directed upward. The car navigation device 1 includes a printed circuit board 2
The heating electronic component 24 is mounted on the printed circuit board 25 in correspondence with the motor 19. Therefore, in the car navigation device 1, since the heat generated from the heat-generating electronic components 24 flows upward, the heat is efficiently transmitted to the disc player 11 and heated.

In the car navigation apparatus 1, when it is difficult to install the disc player 11 and the heat-generating electronic components 24 in close proximity, as shown in FIG. 11 and the heat-generating electronic component 24 may be connected. The heat conducting member 36 is formed of a thin metal plate such as a copper plate having a good heat conductivity, and has one end 36 a fixed to the motor 19 of the disc player 11 and the other end 36 a.
b is fixed to the heat-generating electronic component 24 side. In the car navigation device 1, heat generated from the heat-generating electronic components 24 is efficiently transmitted to the disc player 11 which is separately installed via the heat conducting member 36, and heats the disc player 11.

The heat conducting member 36 is attached to the motor 19 and the heat-generating electronic component 24 while maintaining electrical insulation. The heat conducting member 36 may be formed not only in a thin plate shape but also in, for example, an entire box shape surrounding the motor 19 and the heat-generating electronic component 24.

The present invention is not limited to the above-described car navigation system, but may be applied to various electronic devices having a rotary drive mechanism and heat-generating electronic components such as a CPU, a microcomputer or a power supply circuit component. Of course. INDUSTRIAL APPLICABILITY The present invention, when applied to an electronic device using a battery as a power source, such as a portable audio device, a mobile device, and a mobile phone, has a large effect of reducing power consumption.

[0039]

As described in detail above, according to the electronic apparatus of the present invention, the rotation drive mechanism is kept in a heated state by the heat generated by the heat-generating electronic components, so that it can rotate even under low temperature conditions. Deterioration of the lubrication characteristics of the shaft is suppressed, and the rotating shaft is driven to rotate stably with a low driving torque, thereby reducing power consumption. Further, according to the electronic device, when the temperature in the housing becomes equal to or higher than a predetermined temperature under long-term use or high-temperature conditions, the cooling unit is driven by the detection output of the temperature detection unit to perform cooling. In addition, the operation of electronic components, circuit elements, and the like can be stabilized, and the viscosity of the lubricant filled in the rotation shaft of the rotation drive mechanism can be appropriately maintained, so that the lubricant can be prevented from scattering inside.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a device main body of a car navigation device shown as an embodiment of the present invention.

FIG. 2 is a block diagram of a main part configuration of the car navigation device.

FIG. 3 is an explanatory diagram of a temperature control structure by a cooling fan provided in the apparatus main body.

FIG. 4 is an explanatory diagram of a temperature control structure using the vent and a shutter member.

FIG. 5 is an explanatory diagram of a temperature control structure using the Peltier device.

FIG. 6 is an explanatory diagram of a temperature control structure by the cooler.

FIG. 7 is an explanatory diagram of a temperature control structure based on the arrangement of the heat-generating electronic components.

FIG. 8 is an explanatory diagram of another temperature control structure based on the arrangement of the heat-generating electronic components.

FIG. 9 is an explanatory diagram of a temperature control structure based on the arrangement of the heat-generating electronic component and a heat conductive member.

[Description of Signs] 1 car navigation device, 2 disks, 3 device main body, 4 monitors, 5 speakers, 8 power supply section, 11 disk player, 18 mounting board, 19 motor, 20
Rotating axis, 21 disk table, 22 optical pickup, 23 temperature sensor, 24 heating electronic components, 25 printed circuit board, 26 vent, 27 cooling fan, 28 switch, 29 switch control unit, 31 shutter member,
32 switch, 33 Peltier element, 34 cooler, 35 cooling medium, 36 heat conduction member

Claims (10)

[Claims] At least a rotary drive mechanism for an information recording medium, a heat-generating electronic component, a temperature detecting means, and a cooling means are provided inside a housing, and the rotary drive is performed by generated heat of the heat-generating electronic component. An electronic device, wherein a mechanism is maintained in a heated state, a temperature state in the housing is detected by the temperature detecting means, and when the temperature exceeds a predetermined temperature, cooling is performed by the cooling means. 2. The electronic apparatus according to claim 1, wherein the cooling unit is a cooling fan provided in the housing, and is driven by an over-temperature detection output by the temperature detection unit. 3. The cooling means comprises a vent provided in the housing and a shutter mechanism for opening and closing the vent, and the shutter mechanism is driven by an over-temperature detection output by the temperature detecting means. The electronic device according to claim 1, wherein the vent is opened. 4. The heating means and the cooling means comprise a Peltier element and a current switching means for the Peltier element, and the current switching means is driven by the temperature detection in the housing by the temperature detection means. 2. The electronic apparatus according to claim 1, wherein control of a heating mode and a cooling mode of the Peltier element is performed. 5. A mounting means filled with a medium which changes into a solid phase and a liquid phase at a predetermined temperature as a boundary, and a radiating means connected to the mounting means, wherein the heat-generating electronic component is mounted on the mounting means. The electronic device according to claim 1, wherein the electronic device is attached to the electronic device. 6. A cooling fan provided in the housing and driven by an over-temperature detection output by the temperature detection means, and a vent provided in the housing and an over-temperature detection output by the temperature detection means. A shutter mechanism that is driven to open and close the vent, a Peltier element that switches between a heating mode and a cooling mode by current switching based on an over-temperature detection output by the temperature detection unit, The heating means and / or the cooling means are provided with at least two of a mounting means incorporating a medium which changes into a solid phase and a liquid phase, and a heat radiating means connected to the mounting means. The electronic device according to claim 1. 7. At least a rotary drive mechanism for an information recording medium and a heat-generating electronic component are provided inside the housing, and the rotary drive mechanism is heat-transfer-coupled to the heat-generating electronic component, and An electronic device, wherein the electronic device is heated by the generated heat. 8. The electronic apparatus according to claim 7, wherein the rotation drive mechanism is disposed in the housing so as to be located above the heat-generating electronic component. 9. The electronic apparatus according to claim 7, wherein the rotary drive mechanism is mounted on the same substrate as the heat-generating electronic components and is disposed in the housing. 10. The electronic device according to claim 7, wherein the rotary drive mechanism and the heat-generating electronic component are connected by a heat conducting member.