JP3162601U - USB cable - Google Patents

Abstract

Provided is a USB cable in which a signal line and a power line are separated into two cables, thereby reducing adverse effects of the power line on the signal line. In a USB cable, a power line and a signal line are separately accommodated in a first cable and a second cable, respectively. Can be reduced. As a result, the signal quality of the signal line 32 is improved, and the quality of the sound output from the USB audio device can be improved. [Selection] Figure 1

Description

  The present invention relates to a USB cable that connects a host device and an external device to perform power supply and signal transmission.

  In recent years, USB (Universal Serial Bus) connection is widely used mainly in the field of personal computers. This USB connection includes a signal line and a power line, and can supply power from the host device to the external device as well as transmitting and receiving signals. For this reason, many external devices that operate by receiving power supply from a host device via a USB cable and do not require power supply from a commercial power source or a battery have been commercialized. As one of such external devices that receive power supply via a USB cable, there is a USB audio device that outputs audio such as music by connecting to a host device such as a personal computer.

  Conventionally, music data recording media have been mainly magnetic tapes, CDs, MDs, etc., but at present, recording is performed on recording media connected to a personal computer from the viewpoint of transmitting music data to a portable music player. Has become the mainstream. Along with this, the personal computer assumes the function of the conventional music playback device, and there is a demand for improvement in the sound quality of the USB audio device that outputs these sounds via the USB cable.

  As a means for improving the sound quality of USB audio equipment, in addition to improving the performance of the equipment itself, improving the quality of signals transmitted through the USB cable can be mentioned. As one factor that deteriorates the signal quality of the USB cable, an adverse effect from the power supply line provided in the USB cable can be considered. On the other hand, the following [Patent Document 1] describes a technique for reducing an adverse effect from a power supply line on a signal line by covering the signal line with a covering material.

JP 2005-259385 A

  However, in the invention of [Patent Document 1], since the signal line and the power line are accommodated in one cable, it is difficult to eliminate the adverse effect of the signal line on the power line.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a USB cable in which the signal line and the power line are separated into two cables, thereby reducing the adverse effect of the power line on the signal line. To do.

The present invention
(1) In a USB cable having USB connection terminals 20 and 22 at both ends of a power line 30 and a signal line 32,
A USB cable 50 characterized in that the USB connection terminals 20 and 22 at both ends are connected by a first cable 40 in which a power line 30 is accommodated and a second cable 42 in which a signal line 32 is accommodated. By providing the above, the above-mentioned problems are solved.
(2) The USB connection terminal 20 on the side connected to the power supply device is connected to the first USB connection terminal 20a connected to the first cable 40 and the second USB connection terminal connected to the second cable 42. The above-mentioned problem is solved by providing the USB cable 50a described in (1) above.

  The USB cable according to the present invention can reduce the adverse effect of the power line on the signal line by separating the signal line and the power line into two cables.

It is a figure which shows the USB cable of the 1st form which concerns on this invention. It is a figure which shows the USB cable of the 2nd form which concerns on this invention.

  An embodiment of a USB cable according to the present invention will be described with reference to the drawings. FIGS. 1 and 2A show an example in which a B-type USB connection terminal is used as the USB connection terminal 22 on the external device side, and FIGS. 1B and 2B show an A-type USB connection. An example using terminals is shown.

  The USB cable 50 according to the first embodiment of the present invention shown in FIG. 1 connects the USB connection terminals 20 and 22 to the VBas terminal T1 and the GND terminal T4, which are power terminals of the USB connection terminals 20 and 22, respectively. A power line 30 and a signal line 32 that connects a data (−D) terminal T2 and a data (+ D) terminal T3, which are signal terminals of the USB connection terminals 20 and 22, respectively. The USB connection terminals 20 and 22 are connected by a first cable 40 in which the power line 30 is accommodated and a second cable 42 in which the signal line 32 is accommodated. The above is the configuration of the USB cable 50 according to the first embodiment of the present invention.

  When using this USB cable 50, as with a normal USB cable, one USB connection terminal 20 or 22 is connected to a USB terminal of a host device such as a personal computer, and the USB terminal of an external device such as a USB audio device is connected. The other USB connection terminal 20 or 22 is connected. As a result, the external device receives the prescribed power supply from the host device via the first cable 40. In addition, an audio signal or the like is transmitted / received between the external device and the host device via the second cable 42. The external device operates by receiving power from the first cable 40 and outputs sound corresponding to the signal from the second cable 42.

  At this time, since the power line 30 and the signal line 32 are separately accommodated in the first cable 40 and the second cable 42, the power line 30 and the signal line have an adverse effect on the signal line 32 from the power line 30. This can be reduced as compared with the conventional USB cable in which 32 is enclosed. As a result, the signal quality of the signal line 32 is improved, and the quality of the sound output from the USB audio device can be improved.

  Next, a USB cable 50a according to a second embodiment of the present invention will be described with reference to FIG. The USB cable 50a of the second form is such that the USB connection terminal 20 on the host device side which is a power supply device is connected to the first cable 40, the first USB connection terminal 20a for the power supply line and the second USB connection terminal 20a. And the second USB connection terminal 20b for signal lines connected to the cable 42. That is, the first USB connection terminal 20a connects only the VBas terminal T1 and the GND terminal T4 of the host device and the external device with the power line 30, and the data (−D) terminal T2 and the data (+ D) of the first USB connection terminal 20a. ) The terminal T3 is in an OPEN state in which nothing is connected. The second USB connection terminal 20b connects only the data (−D) terminal T2 and the data (+ D) terminal T3 of the host device and the external device with the signal line 32, and the VBas terminal T1 of the second USB connection terminal 20b. The GND terminal T4 is in an OPEN state in which nothing is connected.

  When this USB cable 50a is used, the first USB connection terminal 20a is connected to one USB terminal of the host device, and the second USB connection terminal 20b is connected to another USB terminal of the host device. Further, the USB connection terminal 22 is connected to the USB terminal of the external device. The connection may be made from either the host device side or the external device side, but it is preferable to connect the host device side first from the first USB connection terminal 20a for the power line. In addition, the first USB connection terminal 20a and the second USB connection terminal 20b change the color or enter characters such as “power” and “destination” so that the user can determine which is the USB connection terminal 20a for the power line. It may be discriminable.

  With this connection, the external device receives a specified power supply from the host device via the first USB connection terminal 20a and the first cable 40. Also, audio signals and the like are transmitted and received between the external device and the host device via the second USB connection terminal 20b and the second cable 42.

  At this time, since the power supply line 30 and the signal line 32 are separately accommodated in the first cable 40 and the second cable 42 and further connected to different USB terminals of the host device, the power supply line received by the signal line 32 The adverse effect from 30 can be further reduced. As a result, the signal quality of the signal line 32 is improved, and the quality of the sound output from the USB audio device can be improved.

  Note that it is preferable to adopt a PCOC-A single-wire two-core shielded cable that theoretically generates no stray current for the first cable 40 and the second cable 42 of the USB cables 50 and 50a. Furthermore, the first cable 40 and the second cable 42 are more preferably covered with a CSF tube containing carbon up to the production limit. According to this configuration, in addition to the double shield effect by the CSF tube and the two-core shielded cable, it is possible to obtain the effect of cutting the radiation noise generated from the cables 40 and 42 and absorbing the electromagnetic wave.

  In this example, the USB connection terminal conforming to the USB 1.1 / 2.0 standard has been described as an example, but the present invention can also be applied to the next generation USB 3.0 standard. Moreover, since the USB cables 50 and 50a described above are examples, the present invention can be modified and implemented without departing from the gist of the present invention.

20, 22 USB connection terminal
20a First USB connection terminal
20b Second USB connection terminal
30 Power line
32 signal lines
40 First cable
42 Second cable
50, 50a USB cable

Claims (2)

In a USB cable having USB connection terminals at both ends of the power line and the signal line,
Between the USB connection terminals at both ends,
A USB cable comprising a first cable that accommodates a power line and a second cable that accommodates a signal line. Connect the USB connection terminal to the power supply device
A first USB connection terminal connected to the first cable;
A second USB connection terminal connected to the second cable;
The USB cable according to claim 1, comprising:

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