JP2005050194A - Electronic apparatus and optical disk apparatus - Google Patents

Abstract

An optical disk apparatus capable of USB connection can be driven by an AC adapter as a driving power source and a USB power bus (VBUS) of a USB interface, and is driven from an AC adapter when the AC adapter is connected and from VBUS when not connected. It is like that. However, in the case of USB power supply driving, it is necessary to operate only on a specific computer in which USB power is strengthened on the computer side.
A connection means having both a power transmission function and a signal transmission function can acquire power from other electronic devices and input / output signals, and at least one of transmission and reception of a signal using the connection means. To determine whether the power acquisition from the connection means is sufficient, and when the determination means determines that the power obtained from the connection means is sufficient, We decided to do the acquisition.
[Selection] Figure 2

Description

  The present invention relates to an electronic apparatus and an optical disc apparatus that can be connected to an electronic apparatus such as a personal computer by a connection means having both a power transmission function and a signal transmission function such as a universal serial bus (USB) interface.

  The activation of the conventional optical media apparatus at the universal serial bus (hereinafter referred to as USB) interface will be described with reference to a block diagram.

  FIG. 9 shows a block diagram of a conventional optical disc apparatus. Here, the CPU 12 performs logical judgment and calculation. The main memory 13 has a program storage area that stores a control program and a recording control program for the optical disc recording apparatus. The buffer memory 11 is used as a storage area necessary for a storage area, recording control, and reproduction control. The feed motor 2 is driven by a motor drive circuit 6. A spindle motor 3 is driven by a motor drive circuit 6 in the same manner. A pickup unit 4 is driven by an actuator drive circuit 7. A CD servo processor 9 servo-controls the motor drive circuit 6 and the actuator drive circuit 7. The drive system power supply circuit 8 supplies power to the motor drive circuit 7.

  In the reproduction system, the optical signal obtained from the optical disc 1 and the pickup unit 4 is processed by the analog signal processing unit 5 and used as a feedback signal of the CD servo processor 9 and becomes an input signal of the digital signal processing unit 10 to the digital signal. Demodulated and the result is stored in the buffer memory 11. The buffer memory 11 is a memory for temporarily storing recording data and demodulated data. These data are transferred to and from the USB conversion IC 17 via the interface unit 14 by communication using the ATAPI bus 16.

  The USB conversion IC 17 converts the received ATAPI signal into a USB signal 18, passes through a USB connector 19, is connected to an external personal computer (host computer) 20 through a USB cable, and transfers data. The system bus 15 is a data transfer bus in the optical disc apparatus. The CPU controls the digital signal processing unit 10 by a program recorded in the main memory. The digital power supply circuit 26 stably supplies various voltages to the digital signal processing unit 10 such as the CPU 12, the digital signal processing unit 10, and the memory 13.

  The voltage supplied to the circuit portion that operates these devices is converted from AC 100 V to DC 6 V by the AC adapter 21 and supplied from the DC jack 22 to the drive. The power supply startup circuit 23 has a mechanism for supplying voltage to the drive system power supply circuit 8 digital system power supply circuit 26 in conjunction with the voltage of the power supply terminal VBUS24 of the USB connector 19, and automatically in conjunction with ON / OFF of the USB power supply. Start and stop the drive.

As a prior example, there are (Patent Document 1) (Patent Document 2) and the like.
JP 2001-144772 A JP 2001-177543 A

A conventional optical disk apparatus uses an AC adapter as described above as a driving power source. Some devices that use USB rely on the USB power supply (VBUS) of the USB interface as the drive power for the device, but the conventional personal computer 20 has a maximum current supplied from the USB in accordance with the USB standard. A supply current of 500 mA is standardized. When a current exceeding 500 mA is drawn, a warning and a USB power supply are shut down on the personal computer 20 side. On the other hand, since the conventional optical disk apparatus requires a maximum supply current of 500 mA or more, the conventional optical disk apparatus cannot be driven by the VBUS of the conventional personal computer 20.

  However, when the supply current from the VBUS in the conventional personal computer 20 exceeds 500 mA, a warning is given to the personal computer system or the VBUS is shut off mainly for semiconductor elements used in the personal computer and its surroundings. It is a factor of the circuit. By changing this semiconductor element and setting VBUS to 500 mA or more, a specific personal computer capable of supplying 500 mA or more by VBAS can be realized.

  In order to solve such a problem, the electronic device and the optical disc apparatus of the present invention can acquire power from other electronic devices and input / output signals by a connecting means having both a power transmission function and a signal transmission function. It is provided with a determination means for determining whether the power acquisition from the connection means is sufficient by at least one of signal transmission and reception using the connection means, and the power obtained from the connection means by the determination means is sufficient. If it is determined, power is acquired through the connection means.

  As a result, the electronic device and the optical disc apparatus according to the present invention can acquire power from other electronic devices and input / output signals by using a connection unit having both a power transmission function and a signal transmission function. When it is determined by at least one of signal transmission and reception whether the power acquisition from the connection means is sufficient, and when the determination means determines that the power obtained from the connection means is sufficient In order to acquire power via the connecting means after confirming that other electronic devices connected can be supplied with power by the electronic equipment characterized by acquiring power via the connecting means, It can be prevented that power or current is excessively supplied to cause malfunction or damage.

  According to the first aspect of the present invention, it is possible to acquire power from other electronic devices and input / output signals using a connection unit having both a power transmission function and a signal transmission function. When at least one of the receptions includes a determination unit for determining whether the power acquisition from the connection unit is sufficient, and the determination unit determines that the power obtained from the connection unit is sufficient, the connection unit Connected after confirming that other connected electronic devices can supply power by connecting means that has both power transmission function and signal transmission function. Since power is acquired through the means, it is possible to prevent power or current from being excessively supplied and causing malfunction or damage.

  The invention according to claim 2 is connectable to a power source capable of supplying sufficient power for the operation of the internal function, and obtains power from the power source when it is determined that the power obtained from the connecting means is not sufficient. According to the electronic device according to claim 1, when electric power cannot be supplied from the connecting means, the electronic device can be switched to another power source capable of supplying electric power.

The invention according to claim 3 is connected by the electronic device according to claim 1, wherein the power acquisition is stopped or terminated when it is determined by the determination means that the power obtained from the connection means is not sufficient. In addition, after confirming that other electronic devices can supply power, obtain power through the connection means, and if it is determined that the power obtained from the connection means is not sufficient, obtain power from at least the connection means. Since this is not performed, it is possible to more reliably prevent power or current from being excessively supplied and causing malfunction or damage.

  According to a fourth aspect of the present invention, the connection means is a universal serial bus (USB) interface, and the power transmission function is the VBUS (voltage bus) of the universal serial bus (USB) interface. A first current of 500 mA or less and a second current exceeding 500 mA can be acquired. When the electronic device is connected to another electronic device with a USB interface, the connection is established. Since it is confirmed that other electronic devices that can be supplied with power can be supplied through the connection means, it is possible to prevent power or current from being excessively supplied, resulting in malfunction or damage. .

  In the invention according to claim 5, since an AC adapter can be connected and the presence or absence of the AC adapter connection can be detected, the electronic apparatus according to claim 4 can use the AC adapter as a power source. The operation power can be acquired more stably.

  According to a sixth aspect of the present invention, when the AC adapter is connected, the AC adapter is used as a power supply source. When the AC adapter is not connected, the second current can be supplied by VBUS. The electronic device according to claim 5, wherein the AC adapter is used preferentially as a power source by using the electronic device according to claim 5, wherein at least the operation power is acquired by the VBUS when a signal to be received is received from another electronic device. When the adapter is not connected, it is confirmed whether the power acquisition from the VBUS is possible in a state where the power consumption is reduced, so it is possible to check whether the power acquisition from the VBUS is possible in a more stable state.

  According to the seventh aspect of the present invention, when the AC adapter is not connected, the power saving state is entered, the power supply to other than the function of waiting and receiving at least the signal provided inside is stopped, and the signal is received. 6. The electronic device according to claim 5, wherein when the power saving state is canceled, the electronic device according to claim 5 confirms whether power can be acquired from the VBUS after the power saving state is entered and the USB is less likely to become overcurrent. Therefore, it is possible to confirm whether or not power acquisition from the VBUS is possible in a more stable state.

  According to the eighth aspect of the present invention, in the power saving state, the current supplied from the other electronic device by the VBUS is the first current value. When the signal is received, the power saving state is canceled and the current is supplied by the VBUS. The current supplied from the electronic device is a second current value, and the electronic device according to claim 7 confirms whether power can be acquired from the VBUS while preventing the USB from becoming an overcurrent. Therefore, it is possible to confirm whether it is possible to acquire power from the VBUS in a more stable state.

  The invention according to claim 9 is the electronic device according to claim 4, further comprising an inrush prevention circuit for reducing the inrush current of the current in a circuit through which a current from VBUS flows. Therefore, it is possible to prevent a warning to the personal computer system due to an overcurrent of VBUS.

According to the tenth aspect of the present invention, is it possible to acquire power and transmit a signal through the USB interface, and is sufficient to acquire power from the USB interface by transmitting and receiving signals using the USB interface? An optical disc apparatus comprising: a determination unit for determining whether or not the determination unit determines that the power obtained from the USB interface is sufficient; Since it is confirmed that other connected electronic devices can supply power, power is acquired via the connection means, so that malfunction or damage of the personal computer system is prevented, and VB
An optical disc apparatus operable in the US can be provided.

  The invention according to claim 11 is connectable to a power source capable of supplying sufficient power for the operation of the internal function, and when it is determined that the power obtained from the USB interface is not sufficient, power is obtained from the power source. 11. The optical disk apparatus according to claim 10, wherein when the power cannot be supplied from the USB, the power supply is switched to another power supply capable of supplying power, so that the optical disk apparatus can be prevented from being unusable.

  The invention according to claim 12 is connected by the optical disk device according to claim 10, wherein when the determination means determines that the power obtained from the USB interface is not sufficient, the power acquisition is stopped or terminated. In addition, after confirming that other electronic devices can supply power, perform power acquisition via USB, and if it is determined that the power obtained from USB is not sufficient, acquire power of at least 500 mA from USB. Therefore, it is possible to provide an optical disk device that prevents the personal computer system from malfunctioning or damaging due to overcurrent at the time of starting up the device.

  According to a thirteenth aspect of the present invention, an optical disc apparatus having the feature according to any one of the fourth to ninth aspects can stably perform a power check operation, and the reliability of electronic components is improved. Equipment can be provided.

  The invention according to claim 14 includes a relay circuit unit to which an AC adapter can be connected and which switches between the AC adapter and the USB interface VBAS (voltage bus), and the relay circuit unit includes: One of a first terminal for inputting a voltage from the AC adapter, a second terminal for inputting a voltage from the VBAS, an input from the first terminal, and an input from the second terminal. A third terminal for outputting, switching means for switching conduction between the terminals, a delay circuit connected to the switching means, and the third terminal side between the first terminal and the third terminal. A first diode connected in a forward direction; and a second diode connected in a forward direction on the third terminal side between the second terminal and the third terminal; The delay circuit The control signal inputted through the switching is switched between conduction between the first terminal and the third terminal or conduction between the second terminal and the third terminal. The power supply can be stably switched by the optical disk device according to Item 11.

  The best mode for carrying out the invention will be described below with reference to the drawings.

  FIG. 1 is an external view of an optical disk apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the optical disk apparatus according to an embodiment of the present invention, and FIG. 4 is a flowchart showing the control, FIG. 4 is a flowchart showing the control for confirming whether the personal computer is a personal computer capable of supplying 500 mA or more, and FIG. 5 is a diagram showing the power supplied to the optical disk device via USB by connecting the optical disk device of the present invention. 6 is a block diagram of a USB output portion of a personal computer that can be supplied, FIG. 6 is a flowchart showing control at the time of connection of a personal computer that is connected to the optical disk device of the present invention and can supply power to the optical disk device via USB, FIG. 8 is a diagram illustrating a configuration of a relay circuit unit, and FIG. 8 is a diagram illustrating a difference in waveform of a drive power supply output or the like depending on the presence or absence of a delay circuit of the relay circuit unit. A.

In FIG. 1, an optical disk device 101 is a so-called external type that is not built in an electronic device such as a personal computer, and an optical disk is mounted by opening an upper lid 102. Reference numeral 103 denotes a USB connection connector, which is connected to, for example, the personal computer 105 by the USB cable 104, so that the personal computer can read data from the optical disk or write data to the optical disk. Reference numeral 106 denotes an AC adapter that steps down and rectifies the voltage from an outlet 107 of a commercial power supply (100 V or the like), and supplies the voltage from the DC jack 108 to the optical disc apparatus 101. As will be described in detail later, the power acquisition of the optical disc apparatus 101 may depend on the AC adapter 106 or on the USB cable 104, and the AC adapter 106 may not be used. Optical disks include CD-ROM, CD-R / RW, DVD-ROM, DVD-RAM, DVD-R / RW, and DVD + R / RW, and the optical disk device 101 can handle one or several types of these optical disks. Is included.

  In this embodiment, a USB interface is adopted as a connection means with other electronic devices such as a personal computer. However, any connection means having both a power transmission function and a signal transmission function may be used, which is an IEEE 1394 interface. Also good.

  Reference numeral 104 denotes a DC jack, which can be connected to an AC adapter 105 for reducing and rectifying the voltage of a commercial power supply (100 V or the like) to serve as a driving power supply. If the power supply circuit for making the current and voltage suitable for internal use is provided in the optical disk apparatus, the AC power supply 105 is not used, and the commercial power supply is directly drawn in with an appropriate wire and connector. good. Further, a battery built in or externally attached to the optical disk apparatus may be used as a driving power supply without using a commercial power supply.

  Next, the configuration of the circuit system of the optical disc apparatus will be described with reference to FIG. A CPU 12 performs logic judgment and calculation. A main memory 13 has a program storage area for storing a control program and a recording control program for the optical disk recording apparatus. A buffer memory 11 is used as a storage area necessary for storage area, recording control, and reproduction control. A feed motor 2 is driven by a motor drive circuit 6. 3 is a spindle motor and is similarly driven by a motor drive circuit 6. A pickup unit 4 is driven by an actuator drive circuit 7. A CD servo processor 9 servo-controls the motor drive circuit 6 and the actuator drive circuit 7. The drive system power supply circuit 8 supplies power to the motor drive circuit 7.

  In the reproduction system, the optical signal obtained from the optical disc 1 and the pickup unit 4 is processed by the analog signal processing unit 5 and used as a feedback signal of the CD servo processor 9 and becomes an input signal of the digital signal processing unit 10 to the digital signal. Demodulated and the result is stored in the buffer memory 11. The buffer memory 11 is a memory for temporarily storing recording data and demodulated data. These data are transferred to and from the USB conversion IC 17 via the interface unit 14 by communication using the ATAPI bus 16.

  The USB conversion IC 17 converts the received ATAPI signal into a USB signal 18, passes through a USB connector 19, is connected to an external host computer 20 through a USB cable, and transfers data. The system bus 15 is a data transfer bus in the optical disc apparatus. The CPU controls the digital signal processing unit 10 by a program recorded in the main memory. The digital power supply circuit 26 stably supplies various voltages to the digital signal processing unit 10 such as the CPU 12, the digital signal processing unit 10, and the memory 13.

  The voltage supplied to the circuit portion that operates these devices is converted from AC 100 V to DC 6 V by the AC adapter 21 and supplied from the DC jack 22 to the drive. The power supply start circuit 23 detects the voltage of the VBUS (power supply bus) 24 of the USB connector 19, and starts or ends the drive by supplying or stopping the voltage to the drive system power supply circuit 8 or the digital system power supply circuit 26 of the drive.

In the vicinity of the VBUS 24, a VBUS inrush prevention circuit 27 for preventing an overcurrent such as a surge when an electronic device such as a personal computer 20 is connected through the USB connector 19, and the power source is DCIN2.
A relay circuit unit 28 for switching between supply from the VBUS 24 and supply from the VBUS 24 is provided. A port for controlling the relay circuit unit 28 and the power supply activation circuit 25 is added to the CPU 12.

  Next, actual control will be described with reference to FIGS.

  When the optical disk apparatus is connected to the personal computer 20 via the USB connector 19 via the USB cable (S1), the VBUS voltage is supplied by the personal computer 20, so that the VBUS voltage is generated by the connection and the change is detected. The power activation circuit 25 operates to supply power from the VBUS to the drive system power circuit 8 and the digital system power circuit 26, and the power is turned on (S2). The CPU monitors the voltages of VBUS and DCIN. When the AC adapter 21 is connected to the DC jack 22, the CPU detects the DCIN voltage (S3), and the relay circuit unit 28 uses the AC adapter 21 as a power source. By setting (S4), power from the AC adapter 21 is supplied to each power supply circuit (S5). When the AC adapter 21 is not connected to the DC jack 22, the relay circuit unit 28 is set to use VBUS as a power source (S6), so that power from the VBUS is supplied to each power circuit ( S7) The CPU 12 detects that VBUS is a power source (S8).

  When VBUS is used as the power source, the drive system is not moved by a command from the CPU 12 to the drive system power supply circuit 8, so that only the circuit system is activated while suppressing the supply current to 500 mA or less (S 9). It communicates with the personal computer 20 and confirms whether it is a specific personal computer that can supply over 500 mA (S10) (the confirmation method will be described later). The CPU determines whether it is a specific personal computer that can supply more than 500 mA (S11), performs mechanical initialization only when it is a specific personal computer (S12), and activates the drive system with a USB power supply (S13). ). If it is recognized that the computer is a conventional personal computer, the inrush prevention circuit 27 is turned off from the power supply starting circuit 25 (S14), the supply of VBUS is stopped, and the drive is shut down (S15). Thereafter, it is not driven by the VBUS power supply until the personal computer 20 is restarted. Thereby, in a conventional personal computer, it is possible to prevent the personal computer 20 and peripheral devices from hanging up by accidentally supplying a current exceeding 500 mA from VBUS.

  Next, a method for the optical disk device to check whether the personal computer connected to the optical disk device can supply over 500 mA will be described with reference to FIG.

  For a specific personal computer that can supply more than 500mA with VBAS, a special USB command or ATA command (vendor command) wrapped in a USB packet decided between the BIOS and the USB connected device when the optical disk device is connected via USB. It is set to issue to the optical disk device. For such setting, the BIOS of the personal computer may be set in advance from the time of shipment. In addition, when the optical disk device is connected to a personal computer for the first time, dedicated driver software is incorporated based on the Inquire information of the device. However, the driver software attached to this optical disk device can be supplied with a specific personal computer that can supply more than 500 mA with VBAS. A list is created, and the personal computer determines whether this personal computer is in the list of specific personal computers. If the personal computer is a specific personal computer, a special USB command or an ATA command wrapped in a USB packet on the optical disk device ( It may be configured to incorporate a driver that issues a vendor command.

When the optical disk device and the personal computer are connected, VBUS is turned ON, so that VBUS of the optical disk device is turned ON, and at the same time, negotiation of the BIOS of the personal computer and the optical disk device is started (S16). When the negotiation is established, it waits for a special USB command or an ATA command (vendor command) wrapped in a USB packet (S17). It is determined whether a special command has been received (S18), and if a special command is received, VBA
It is recognized as a specific personal computer that can supply over 500 mA in S (S19). If a special command is not received, it is recognized that it is not a specific personal computer that can supply more than 500 mA with VBAS (S20).

  On the other hand, on the personal computer side as well, it is desirable that the power supply can be stably supplied to the optical disc apparatus with VBUS exceeding the maximum supply current of 500 mA. Next, with reference to FIGS. 5 and 6, the configuration and operation of a personal computer capable of stably supplying power to an external device with a VBUS exceeding the maximum supply current of 500 mA will be described.

  The USB controller 29 in the personal computer converts the signal from the CPU 30 into a USB signal and outputs it, or converts the input USB signal and outputs it to the CPU 30. Input / output of USB signals to and from the optical disk device is performed by a USB cable 104 (see FIG. 1) via a USB connector 31 provided in the personal computer. The USB power source 32 is a power supply source by VBUS. The VBUS supplies power to the optical disc apparatus via the USB connector 31 via the USB cable 104 (see FIG. 1). BIOS data and the like are written in the ROM 33, which is read by the CPU 30 when the personal computer is activated and the BIOS is started up.

  When the personal computer is activated, the personal computer acquires Inquire information of the optical disk device connected via USB (S21), and identifies whether the optical disk device is an optical disk device that requires a current exceeding 500 mA in VBAS (S22). As an identification method, an ID list of an optical disk device that requires a current exceeding 500 mA in VBAS is set in advance in the BIOS of the personal computer in advance, and collation with the ID of the connected optical disk device is performed. May be. Also, an ID is taken into the personal computer by the PC driver software attached to the optical disk device that requires a current exceeding 500 mA in VBAS, and the ID of the device connected by USB is an optical disk device that requires a current exceeding 500 mA in VBAS. It may be recognized as an ID.

  When the personal computer is started, the BIOS rises and the VBUS power is supplied from the USB power source 32. The personal computer monitors the current of the VBUS by the current detection circuit in the USB power source 32, and the recognized USB connected device. However, the threshold value of the current to be monitored is changed depending on whether or not the optical disk apparatus requires more than 500 mA in VBAS (S22). If it is not an optical disk device that requires more than 500 mA in VBAS, the threshold value of the VBUS current is set to the threshold value A (S23), and if it is an optical disk device that requires more than 500 mA in VBAS, the threshold value of the VBUS current is set to the threshold value B. (S24). The threshold value A is preferably an effective value current of 500 mA, and may be an inrush current of 1.5 A or more in order to cope with an inrush current at the time of USB connection. The threshold value B is preferably a value exceeding the effective value current of 500 mA.

  Next, the current of VBUS being monitored is compared with the threshold value (S26), and if it is less than the threshold value, the startup operation of the personal computer is continued (S27). If it is equal to or greater than the threshold value, the USB interface port is blocked (S28), and the startup operation is continued (S27). In the start-up operation, as described above, the negotiation between the BIOS of the personal computer and the optical disk device is started, and in the case of the optical disk device that can be started by VBUS, a specific personal computer that can supply a current exceeding 500 mA from the personal computer BIOS by the USB signal. A vendor command indicating that there is a certain issue is issued.

  Next, the relay circuit unit 28 will be described in detail with reference to FIG.

The voltage of VBUS 24 is supplied to the drive power supply circuit 8 through the diode A 34 and the relay 35. The DCIN 23 connected to the AC adapter 21 is stepped down by the power supply circuit 36 and supplied to the drive power supply circuit 8 through the diode B37 and the relay 35. Different terminals of the relay 35 are wired with the VBUS 24, the drive power supply circuit 8, and the DCIN 23 so that switching between the VBUS 24 and the drive power supply circuit 8 or the DCIN 23 and the drive power supply circuit 8 can be switched. Is set. The operation of the relay 35 is performed in response to a control signal from the power supply starting circuit 25 that has passed through the delay circuit 38.

  Next, the operation of the relay circuit unit will be described. The voltage (for example, 6V) of the AC adapter is stepped down to 5V by the power supply circuit 36 and supplied to the driving power supply circuit 8 through the diode B37 and the relay 35. When there is no relay 35 and only the diode A34 and the diode B37, the VBUS voltage 5V is lowered by about 0.8V due to the voltage drop by the diode, and the initial drive of the optical disk becomes unstable. On the other hand, when only the relay 35 without the diode A34 and the diode B37 is used, the voltage drop can be prevented, but the power supply is momentarily interrupted when switching the relay. Therefore, when the switching is performed during reading and writing, the drive is reset and abnormally ends.

  Further, as shown in FIG. 8, the relay 35 is switched when a voltage of a predetermined value (for example, 3V) or more is applied by the delay circuit 38, but the power is supplied from the DCIN 23 or the VBUS 24. When the relay is operated in a state without 38, the voltage supplied from the power supply circuit 36 is switched in a state of 3 V or more, so that the voltage to the drive power supply circuit 8 has dropped at the time of switching (point A section). Therefore, the delay circuit 38 is added, and the voltage drop to the drive power supply circuit 8 is prevented by switching the relay 35 after the DCIN 23 is supplied and the voltage of the power supply circuit 36 is sufficiently increased to 5V. The delay circuit 38 may be operated by a control signal from the CPU 12. When the VBUS power supply and the DCIN power supply are detected during the operation of the AC adapter, it is possible to forcibly cut off the drive power supply of the relay 35 by the control signal from the CPU 12 and forcibly switch to the drive by the VBUS24.

  As described above, the optical disk apparatus of the present invention operates with the power of the AC adapter in all computers when the AC adapter is connected, and the USB power supply is strengthened in the case of the USB power drive without the AC adapter connected. In addition, it is possible to realize an optical disc apparatus that permits USB power supply drive only with a specific computer and that can be prevented from being driven with a USB power supply when connected to a conventional computer.

  In this embodiment, an example in which a USB-connected optical disk device is connected to a personal computer is described. However, the present invention is not limited to a USB-connected optical disk device, and may be an electronic device (USB device) capable of USB connection. In this case, the USB device can supply power for operation from a personal computer via USB, and is effective when the supply current at VBUS exceeds 500 mA. The personal computer is set to be able to supply power to the USB device. In this case, the supply current is effective when the supply current can exceed 500 mA. When the USB device and the personal computer are both a USB device that requires a VBUS supply current exceeding 500 mA and a PC that can supply a VBUS exceeding 500 mA, and distinguishing each other from other USB devices or personal computers It is effective for. The target to which the USB device is connected is not limited to a personal computer, and may be an electronic device that can be connected by USB and can supply power to the connected device. In this case, a specific command indicating that the electronic device is a specific electronic device whose USB power supply is strengthened by means of depending on the BIOS or not depending on the BIOS is issued as a USB signal.

  The present invention can be applied to a USB device that can be USB-connected to an electronic device, and that supplies power from the electronic device via USB VBUS.

1 is an external view of an optical disc apparatus according to an embodiment of the present invention. 1 is a block diagram showing a configuration of an optical disc apparatus according to an embodiment of the present invention. Flow chart showing control of operation with USB power supply and AC adapter power supply Flowchart showing control in which the optical disc apparatus confirms whether the personal computer is a personal computer capable of supplying 500 mA or more. Block diagram of a USB output portion of a personal computer to which the optical disk apparatus of the present invention is connected and power can be supplied to the optical disk apparatus via USB The flowchart which shows the control at the time of the connection of the personal computer which can connect the optical disk apparatus of this invention and can supply the electric power to an optical disk apparatus by USB Diagram showing the configuration of the relay circuit section The figure which shows the difference in the waveform of the drive power output etc. with the presence or absence of the delay circuit of the relay circuit Block diagram of a conventional optical disk device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Feed motor 3 Spindle motor 4 Pickup unit 6 Motor drive circuit 7 Actuator drive circuit 8 Drive system power supply circuit 9 CD servo processor 10 Digital signal processing part 11 Buffer memory 12 CPU
13 Main Memory 14 Interface Unit 15 System Bus 16 ATAPI Bus 17 USB Conversion IC
18 USB signal 19 USB connector 20 PC 21 AC adapter 22 DC jack 23 DCIN
24 VBUS
25 Power Supply Start Circuit 26 Digital Power Supply Circuit 27 Inrush Prevention Circuit 28 Relay Circuit Unit 29 USB Controller 30 CPU
31 USB connector 32 USB power supply 33 ROM
34 Diode A
35 Relay 36 Power supply circuit 37 Diode B
38 Delay Circuit 101 Optical Disk Device 102 Top Cover 103 USB Connector 104 USB Cable 105 Personal Computer 106 AC Adapter 107 Outlet 108 DC Jack

Claims (14)

The connection means having both the power transmission function and the signal transmission function can acquire power from other electronic devices and input / output signals, and the connection is performed by at least one of transmission and reception of signals using the connection means. Means for determining whether or not the power acquisition from the means is sufficient, and when the determination means determines that the power obtained from the connection means is sufficient, the power acquisition is performed via the connection means. Electronic equipment characterized by 2. A power supply capable of supplying power sufficient for operation of an internal function is connectable, and power is obtained from the power supply when it is determined that the power obtained from the connection means is not sufficient. Electronic equipment. 2. The electronic device according to claim 1, wherein when the determination unit determines that the power obtained from the connection unit is not sufficient, the power acquisition is stopped or terminated. The connecting means is a universal serial bus (USB) interface, and the power transmission function is the VBUS (voltage bus) of the universal serial bus (USB) interface, and the first current of 500 mA or less at the VBUS. The electronic device according to claim 1, wherein a second current exceeding 500 mA can be acquired. The electronic apparatus according to claim 4, wherein an AC adapter can be connected, and whether or not the AC adapter is connected can be detected. When the AC adapter is connected, the AC adapter is used as a power supply source. When the AC adapter is not connected, a signal indicating that the second current can be supplied by VBUS is sent from another electronic device. 6. The electronic apparatus according to claim 5, wherein when receiving, at least the operating power is acquired by the VBUS. When the AC adapter is not connected, the power saving state is entered, and the power supply to other than the function of waiting and receiving at least the signal provided inside is stopped. When the signal is received, the power saving state is The electronic device according to claim 5, wherein the electronic device is released. In the power saving state, the current supplied from the other electronic device by the VBUS is the first current value, and when the signal is received, the current is released from the power saving state and supplied from the other electronic device by the VBUS. The electronic device according to claim 7, wherein is a second current value. 5. The electronic apparatus according to claim 4, further comprising an inrush prevention circuit for reducing an inrush current of the current in a circuit through which a current from VBUS flows. It is possible to acquire power and transmit a signal through a USB interface, and to determine whether power acquisition from the USB interface is sufficient by performing transmission and reception of a signal using the USB interface, An optical disc apparatus characterized in that when the determination unit determines that the power obtained from the USB interface is sufficient, the power is acquired through the USB interface. 11. The power supply can be connected to a power supply capable of supplying sufficient power for the operation of the internal function, and power is acquired from the power supply when it is determined that the power obtained from the USB interface is not sufficient. Optical disk device. 11. The optical disc apparatus according to claim 10, wherein when the determination unit determines that the power obtained from the USB interface is not sufficient, the power acquisition is stopped or terminated. An optical disc device comprising the feature according to any one of claims 4 to 9. An AC adapter is connectable, and has a relay circuit section that switches between the AC adapter and the USB interface VBAS (voltage bus), and the relay circuit section is connected to the voltage from the AC adapter. A first terminal for inputting a voltage, a second terminal for inputting a voltage from the VBAS, and a third terminal for outputting one of an input from the first terminal and an input from the second terminal And switching means for switching conduction between the terminals, a delay circuit connected to the switching means, and the third terminal side connected in a forward direction between the first terminal and the third terminal. A first diode, and a second diode connected in a forward direction on the third terminal side between the second terminal and the third terminal;
Whether the switching means conducts between the first terminal and the third terminal or between the second terminal and the third terminal according to a control signal input via the delay circuit. The optical disk apparatus according to claim 11, wherein the optical disk apparatus is switched.

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