JP4372574B2 - In-vehicle multimedia device - Google Patents

Description

  The present invention relates to an in-vehicle multimedia device that is mounted on a vehicle and processes various information.

  2. Description of the Related Art Conventionally, an in-vehicle multimedia device is known in which an audio device such as a radio or a CD (Compact Disc) player and a navigation device that displays information such as a map on a liquid crystal display device and performs various guidance to a user are integrated. . In such an in-vehicle multimedia device, in order to reduce the outer size, a navigation board on which a digital circuit that realizes a navigation function is mounted and an analog circuit that realizes an audio function are mounted in one housing. The audio board is housed.

  However, if the audio board and the navigation board are arranged close to each other, noise generated from one board affects the operation of the other board, resulting in a problem that stable operation cannot be performed. In particular, with audio boards, music may not be played normally due to the influence of the navigation board. In order to solve this problem, for example, it is conceivable to insert a blocking plate for blocking noise between the audio board and the navigation board.

  On the other hand, in recent years, as navigation devices become more sophisticated, the operation of a CPU (Central Processing Unit) mounted on the navigation board has become faster, and the increase in heat generated by the CPU stabilizes the navigation board itself. The problem of not working. This problem of heat generation has become more prominent with the downsizing of the outer shape of the in-vehicle multimedia device. As a method for coping with such heat generation, Patent Document 1 discloses a navigation system mounting structure in which a navigation board is disposed in an air duct and cooled by conditioned air.

JP 2002-52957 A

  However, in the configuration in which the shielding plate is inserted between the audio board and the navigation board described above, the in-vehicle multimedia device becomes expensive and a space for installing the shielding plate is required, which is an obstacle to downsizing. It has become.

  In addition, the navigation system mounting structure disclosed in Patent Document 1 described above cannot be realized unless the navigation system and the air conditioner are designed at the same time, so that it is difficult to realize with a single commercially available navigation device.

  The present invention has been made to solve the above-described problems, and can eliminate the influence between a plurality of circuit boards, and can efficiently process the heat generated in the circuit boards. An object is to provide a media device.

The present invention vehicle multimedia device according to the comprises a body portion that houses the audio substrate on which a circuit is mounted for implementing the audio function, and the navigation board on which a circuit is mounted for implementing the navigation function, the navigation board, the main body is configured parts and separately spaced capable disposed from the body portion houses the audio board, a display unit for displaying information based on the signal sent from at least one audio board and the navigation board It has.

An in-vehicle multimedia device according to the present invention, a main body portion containing the navigation board, and a display unit that houses the audio board formed separately, and disposed to be spaced apart from the display unit from the main body portion Therefore, for example, the distance between the audio board and the navigation board can be increased in a use state. As a result, the influence between the audio board and the navigation board can be eliminated.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
The in-vehicle multimedia device according to Embodiment 1 of the present invention is such that the audio board is accommodated in the main body and the navigation board is accommodated in the display unit that is rotatably attached to the main body. is there.

  1 is an external perspective view schematically showing the structure of an in-vehicle multimedia device according to Embodiment 1 of the present invention. This in-vehicle multimedia device includes a display unit 1, a main body unit 2, and a hinge unit 3 that connects them. The display unit 1 is rotatably attached to the main body unit 2 by a hinge unit 3.

  The hinge unit 3 is, for example, a cable for transmitting and receiving signals between the display unit 1 and the main body unit 2 (not shown) as in the structure for connecting the monitor unit and the keyboard unit in a foldable mobile phone. ) Is incorporated.

  As shown in the sectional view of FIG. 2, the display unit 1 includes a display housing 10, a liquid crystal panel 11, a backlight 12, and a navigation board 13 housed in the display housing 10.

  The liquid crystal panel 11 is the same as that used in a conventional car navigation apparatus, and displays images and characters such as maps and guidance messages.

  The backlight 12 illuminates the liquid crystal panel 11 from behind. Thereby, the image displayed on the liquid crystal panel 11 is displayed brightly. As the backlight 12, a white LED (Light Emitting Diode) can be used. By using a white LED as the backlight 12, the display housing 10 of the display unit 1 can be thinned. Further, it is possible to prevent the heat generated by the backlight 12 from affecting the operation of the navigation board 13. In addition, as the backlight 12, although the fluorescent lamp currently used can also be used, it is preferable to use white LED from said viewpoint.

  The navigation board 13 is mainly equipped with a digital circuit for realizing a navigation function. This digital circuit consists of a CPU for realizing the main functions of car navigation, DRAM (Dynamic Random Access Memory), flash memory and graphics circuits, and a voice codec (for hands-free telephone function) for realizing sub-functions, A large-scale integrated circuit (LSI) 14 such as a DSP (Digital Signal Processor) used for audio data compression and a D / A converter for audio data is included.

  As shown in FIG. 1, the main unit 2 includes a main body case 20, an audio board 21 accommodated in the main body case 20, a DVD (Digital Versatile Disk) drive 22, and an HDD (Hard Disk Drive) 23. Yes.

  The audio board 21 mainly has an analog circuit for realizing an audio function. This analog circuit includes an FM / AM tuner circuit, an analog audio control circuit, an NTSC encoder for processing video information, etc., in addition to a circuit for driving the DVD drive 22 and the HDD 23.

  The DVD drive 22 is the same as that used in a conventional car navigation apparatus, and a DVD disk storing map data and music data is mounted. The map data stored in the DVD disk mounted on the DVD drive 22 is read and sent to the navigation board 13 of the display unit 1 and processed by the navigation board 13 so that a map is displayed on the liquid crystal panel 11. The In addition, music data stored in a DVD disk loaded in the DVD drive 22 is read and sent to the audio board 21 and processed by the audio board 21 to reproduce music.

  The HDD 23 is the same as that used in a conventional car navigation device, and can store map data and music data in the same manner as the DVD drive 22. In this case, the map data stored in the HDD 23 is sent to the navigation board 13 of the display unit 1 and processed by the navigation board 13, thereby displaying a map on the liquid crystal panel 11. In addition, music data stored in the HDD 23 is sent to the audio board 21 and processed by the audio board 21 to reproduce music.

  In the in-vehicle multimedia device configured as described above, various signals are transmitted and received between the navigation board 13 and the audio board 21 via the cable incorporated in the hinge unit 3, thereby providing an audio function and a navigation function. Realized. In addition, since the operation | movement of the circuit mounted in the navigation board | substrate 13 and the audio board | substrate 21 in order to implement | achieve an audio function and a navigation function is the same as the past, detailed description is abbreviate | omitted.

  As described above, according to the in-vehicle multimedia device according to Embodiment 1 of the present invention, the display unit 1 and the main body unit 2 are connected by the hinge unit 3, and a digital system circuit is mounted on the display unit 1. Since the navigation board 13 is accommodated and the audio board having the analog circuit mounted on the main body 2 is accommodated, the digital circuit and the analog circuit are physically separated from each other. become. As a result, it is possible to prevent the analog system circuit from being affected by the noise generated from the digital system circuit, and conversely, the digital system circuit from being affected by the noise generated from the analog system circuit. In particular, the noise generated from the navigation board 13 affects the FM / AM tuner circuit mounted on the audio board 21, and the problem that the FM / AM tuner circuit cannot receive radio waves can be solved.

  Further, according to the in-vehicle multimedia device according to the first embodiment, since the navigation board 13 is accommodated in the display unit 1, the distance between the navigation board 13 and the liquid crystal panel 11 is reduced, and the component arrangement is efficiently performed. The effect that it can be performed is acquired.

  In the in-vehicle multimedia device according to the first embodiment described above, the navigation board 13 is accommodated in the display unit 1 and the audio board 21 is accommodated in the main body unit 2. The audio board 21 can be accommodated, and the navigation board 13 can be accommodated in the main body 2. Also in this case, the influence between the audio board 21 and the navigation board 13 can be eliminated. The display unit 1 is provided with an in-dash function that can be rotated and accommodated, but may be a fixed display unit.

  In the in-vehicle multimedia device according to Embodiment 1 described above, a white LED is used as the backlight 12 in order to reduce the thickness of the display unit 1 and suppress heat generation in the display unit. Instead of the light 12, an organic EL display (organic electroluminescence display) can also be used. Also in this case, the display housing 10 of the display unit 1 can be made thin, and heat generation can be prevented from affecting the operation of the navigation board 13. Further, as the H / W configuration of the first embodiment, music is read from the DVD driver and navigation map is read from the HDD, but a music CD may be inserted into the DVD driver, and the map is also read from the DVD driver. You may comprise.

Embodiment 2. FIG.
The in-vehicle multimedia device according to Embodiment 2 of the present invention efficiently dissipates heat generated by a CPU mounted on a navigation board housed in a display unit.

  As described in the Background Art section, with the recent increase in functionality of navigation devices, the operation of the CPU mounted on the navigation board has become faster and the heat generated by the CPU has also increased. Conventionally, in order to prevent the heat generated from the CPU from affecting the operation of the entire board, a heat sink or the like is installed on the upper surface of the CPU to dissipate the heat generated by the CPU. It is desired to increase. The in-vehicle multimedia device according to Embodiment 2 can meet such a request.

  The in-vehicle multimedia device according to the second embodiment is different from that according to the first embodiment only in the structure of the display unit 1. FIG. 3 is an enlarged cross-sectional view showing a part of the display unit 1 of the in-vehicle multimedia device according to the second embodiment.

  The navigation board 13 is arranged so that the upper surface of the package of the CPU 14 which is an LSI mounted thereon is in contact with the inner surface of the display housing 10. As a material of the display housing 10, a metal or ceramic having a high heat transfer effect can be used. Note that the navigation board 13 may be arranged so that the upper surface of the package of the CPU 14 is not in contact with the inner surface of the display housing 10 but is close thereto.

  With this configuration, the display housing 10 functions as a heat radiating plate (heat sink), and heat generated by the CPU 14 is conducted to the entire display housing 10 and radiated.

  As described above, according to the in-vehicle multimedia device according to the second embodiment of the present invention, since the display housing 10 is used as a heat sink, it is mounted on the navigation board 13 without requiring a special cooling device. Since the heat generated by the CPU 14 can be dissipated, the navigation board 13 can be stably operated despite the low cost.

  In the on-vehicle multimedia device according to the second embodiment described above, the upper surface of the package of the CPU 14 mounted on the navigation board 13 is configured to be in direct contact with the display housing 10. And the heat sink can be configured to contact the display housing. Also with this configuration, the same effect as described above can be obtained.

Embodiment 3 FIG.
The in-vehicle multimedia device according to Embodiment 3 of the present invention controls the processing load factor of the CPU depending on whether the display unit is operating, thereby suppressing the heat generated by the CPU. It is.

  In the in-vehicle multimedia device according to Embodiment 1 described above, when the display unit 1 has an in-dash mechanism (not shown) for storing the display unit 1 in the dashboard of the vehicle, the display unit 1 is stored in the dashboard. No need to display information. Therefore, in the in-vehicle multimedia device according to the first embodiment, while the display unit 1 is housed in the dashboard, the processing load of the CPU 14 mounted on the navigation board 13 is less than when the display unit is discharged. Also try to lower.

  The structure of the in-vehicle multimedia device is the same as that of the in-vehicle multimedia device according to Embodiment 1 shown in FIG.

  FIG. 4 is a block diagram showing a configuration of a load control circuit for realizing a CPU processing load lowering function mounted on the navigation board 13 of the in-vehicle multimedia device according to the third embodiment. Note that the CPU 14 internally times the frequency of the clock from the crystal resonator that oscillates at a predetermined frequency, where N is an integer, as the CPU mounted on a normal personal computer. It has functions, and N can be controlled by software.

  The load control circuit includes an in-dash detection unit 41, a CPU processing load control unit 42, and a CPU clock control unit 43. The in-dash detection unit 41 corresponds to the detection unit of the present invention.

  The in-dash detection unit 41 detects whether the display unit 1 is stored in the dashboard or discharged from the dashboard. This in-dash detection part 41 can be comprised from the micro switch arrange | positioned so that it may be pressed when the display part 1 is accommodated in a dashboard, for example. When the in-dash detection unit 41 detects that the display unit 1 is stored in the dashboard, the in-dash detection unit 41 sends storage event information to the CPU processing load control unit 42 and detects that the display unit 1 is discharged from the dashboard. Sends the discharge event information to the CPU processing load control unit 42.

  In response to the storage event information sent from the in-dash detection unit 41, the CPU processing load control unit 42 determines a multiple of the clock frequency. This multiple is stored in advance in the CPU processing load control unit 42 as a constant. The multiple determined by the CPU processing load control unit 42 is sent to the CPU clock control unit 43.

  The CPU clock control unit 43 changes the clock frequency of the CPU 14 in accordance with the multiple sent from the CPU processing load control unit 42.

  Next, the operation of the in-vehicle multimedia device according to Embodiment 3 of the present invention configured as described above will be described. Here, it is assumed that the CPU 14 is operating at a multiple N1 when the display unit 1 is ejected from the dashboard.

  First, the operation for reducing the processing load on the CPU 14 will be described. When the in-dash detection unit 41 detects that the display unit 1 is stored in the dashboard, the in-dash detection unit 41 issues storage event information to the CPU processing load control unit 42. When the CPU processing load control unit 42 receives the storage event information from the in-dash detection unit 41, the CPU processing load control unit 42 sends N2 (N1> N2) stored in advance so as to obtain a predetermined clock frequency to the CPU clock control unit 43. . The CPU clock control unit 43 executes processing for changing the clock frequency of the CPU 14 from the multiple N1 to the multiple N2 according to the multiple N2 sent from the CPU processing load control unit 42. Thereafter, the CPU 14 operates at a clock frequency of a multiple N2, which is lower than the clock frequency of the multiple N1.

  Next, the operation for returning the processing load of the CPU 14 to the original will be described. When the in-dash detection unit 41 detects that the display unit 1 is discharged from the dashboard, the in-dash detection unit 41 issues discharge event information to the CPU processing load control unit 42. When the CPU processing load control unit 42 receives the discharge event information from the in-dash detection unit 41, the CPU processing load control unit 42 sends N1 stored in advance so as to restore the clock frequency to the CPU clock control unit 43. The CPU clock control unit 43 executes processing for changing the clock frequency of the CPU 14 from the multiple N2 to the multiple N1 according to the multiple N1 sent from the CPU processing load control unit 42. Thereafter, the CPU 14 operates at a clock frequency of multiple N1, which is higher than the clock frequency of multiple N2.

  As described above, according to the in-vehicle multimedia device according to Embodiment 3 of the present invention, it is detected that the display unit 1 is housed in the dashboard, and the multiple of the clock frequency is changed from N1 to N2. Since it did in this way, CPU14 will operate | move by the clock frequency of N2 / N1, and it becomes possible to suppress the heat | fever generate | occur | produced by CPU14 to about N1 / N2.

  In the in-vehicle multimedia device according to the third embodiment described above, the processing load factor of the CPU 14 is controlled depending on whether the display unit 1 is housed in the dashboard or discharged. A power switch for supplying power to the liquid crystal panel 11 and the backlight 12 can be provided, and the processing load factor of the CPU 14 can be controlled depending on whether or not the power switch is pressed. In this case, the power switch corresponds to the detection unit of the present invention. Generally speaking, the processing load factor of the CPU can be controlled depending on whether the display unit 1 is operating.

  In the in-vehicle multimedia device according to the third embodiment described above, the example in which the CPU processing load is reduced by hardware control of changing the clock frequency of the CPU 14 has been described. However, the CPU processing load is controlled by software control. It can also be configured to reduce the. For example, when it is detected that the display unit 1 is stored in the dashboard, the processing for reading the map data every 100 msec is usually changed every 500 msec, or each process for realizing the navigation function is prioritized in advance. Can be configured so that processing below a predetermined priority is not executed.

Embodiment 4 FIG.
The in-vehicle multimedia device according to Embodiment 4 of the present invention detects the temperature of the display unit and controls the processing load factor of the CPU according to the detection result, thereby suppressing the heat generated by the CPU. It is a thing.

  In the in-vehicle multimedia device according to the first embodiment described above, the white LED is used as the backlight 12 so as to suppress the heat generated in the display unit 1. However, it generates heat. Therefore, in the in-vehicle multimedia device according to the fourth embodiment, heat generation in the display unit 1 is detected, and the processing load on the CPU is forcibly reduced when the temperature exceeds a predetermined temperature.

  The structure of the in-vehicle multimedia device is the same as that of the in-vehicle multimedia device according to Embodiment 1 shown in FIG.

  FIG. 5 is a block diagram showing a configuration of a load control circuit for realizing a CPU processing load reducing function mounted on the navigation board 13 of the in-vehicle multimedia device according to the fourth embodiment. As with the CPU in the third embodiment, the CPU 14 has a function of internally multiplying the clock frequency from the crystal resonator oscillating at a predetermined frequency by N times (N is an integer) to be its own clock. N can be controlled by software.

  The load control circuit includes a temperature sensor 51, a temperature determination unit 52, and a CPU processing load control unit 53.

  The temperature sensor 51 measures the temperature of a predetermined location of the display unit 1. The temperature measured by the temperature sensor 51 is sent to the temperature determination unit 52 as temperature data.

  The temperature determination unit 52 determines whether the temperature data sent from the temperature sensor 51 is equal to or less than a predetermined threshold value. When it is determined that the value is equal to or less than the predetermined threshold value, the reduction process request information is sent to the CPU processing load control unit 53.

  The CPU processing load control unit 53 executes processing for reducing the processing load on the CPU 14 in response to the reduction processing request information sent from the temperature determination unit 52. The processing for reducing the processing load is, for example, by changing the processing that normally reads map data every 100 msec every 500 msec, or by setting a priority in advance for each processing for realizing the navigation function, This is realized by controlling not to execute the processing below the priority.

  Next, the operation of the in-vehicle multimedia device according to Embodiment 4 of the present invention configured as described above will be described.

  First, the temperature sensor 51 measures the temperature at a predetermined position of the display unit 1 at a predetermined timing, and sends the measured temperature to the temperature determination unit 52. The temperature determination unit 52 determines whether or not the received temperature is equal to or lower than a predetermined threshold. If the temperature exceeds the threshold, the temperature determination unit 52 issues reduction process request information to the CPU processing load control unit 53. When the CPU processing load control unit 53 receives the reduction processing request information, the CPU processing load control unit 53 performs the above-described processing for reducing the processing load.

  As described above, according to the in-vehicle multimedia device according to the fourth embodiment of the present invention, the temperature of the display unit 1 is measured and the processing load of the CPU 14 is reduced according to the measurement result. Therefore, it is possible to prevent the navigation board 13 from operating abnormally due to the temperature rise of 1.

  Note that the in-vehicle multimedia device according to Embodiment 4 described above is configured to have only one threshold value for determining the temperature of the display unit 1, but may be configured to have a plurality of threshold values. By having a plurality of threshold values, for example, the map data read cycle can be changed stepwise from 100 msec → 200 msec → 400 msec → 800 msec. Further, any one of a plurality of priorities can be assigned to each process, and the process to be stopped can be changed stepwise according to the temperature measured by the temperature sensor 51. With this configuration, it is possible to realize a more flexible CPU processing load reduction.

  Further, in the in-vehicle multimedia device according to the fourth embodiment described above, the example of the CPU load reduction by the software processing has been described. However, as in the in-vehicle multimedia device according to the third embodiment, the clock frequency of the CPU 14 is controlled. Thus, the processing load of the CPU 14 can be reduced by hardware, and thus heat generation can be suppressed.

1 is an external perspective view schematically showing the structure of an in-vehicle multimedia device according to Embodiment 1 of the present invention. It is sectional drawing of the display part used with the vehicle-mounted multimedia apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which expands and shows a part of display part used with the vehicle-mounted multimedia apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the load control circuit mounted in the navigation board | substrate of the vehicle-mounted multimedia apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of the load control circuit mounted in the navigation board | substrate of the vehicle-mounted multimedia apparatus which concerns on Embodiment 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Display part, 2 Main body part, 3 Hinge part, 10 Display housing | casing, 11 Liquid crystal panel, 12 Backlight, 13 Navigation board, 14 LSI (CPU), 20 Main body housing | casing, 21 Audio board | substrate, 22 DVD drive, 23 HDD , 41 In-dash detection unit, 42 CPU processing load control unit, 43 CPU clock control unit, 51 temperature sensor, 52 temperature determination unit, 53 CPU processing load control unit.

Claims (3)

An audio board on which a circuit for realizing an audio function is mounted;
A navigation board equipped with a circuit for realizing a navigation function;
A main body for accommodating the navigation board;
It is configured separately from the main body portion and is arranged to be separated from the main body portion, accommodates the audio board, and displays information based on a signal sent from at least one of the audio board and the navigation board. Display section
Preparative car mounting multimedia device you wherein Rukoto equipped with. An audio board on which a circuit for realizing an audio function is mounted;
A navigation board equipped with a circuit for realizing a navigation function;
A main body for accommodating the audio board;
The navigation unit is configured to be separated from the main body unit, is separated from the main body unit, accommodates the navigation board, and displays information based on a signal transmitted from at least one of the audio board and the navigation board. Display section
And
It has a detection unit that detects whether the display unit is in operation,
The detection portion of the detection results car mounting multimedia device you characterized in that the processing load rate of the CPU mounted on the navigation board is varied according to the. Equipped with an in-dash mechanism that controls storage or discharge of the display unit,
The detection unit detects that the display unit is not operating when the display unit is housed by the in-dash mechanism, and detects that the display unit is operating when the display unit is discharged by the in-dash mechanism. The in-vehicle multimedia device according to claim 2, wherein

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