Portable storing device

Abstract

To provide a USB device and a control method thereof capable of supporting a single operation of a plurality of kinds of storage media and improving a user convenience as well as saving power. The USB device comprises a bus switching means, a detection means, an auxiliary power unit and a power control means. The bus switching means controls a USB connection between a storage medium and a host so that they are physically engaged or disengaged. The detection means detects the storage medium that has been switched and engaged by the bus switching means. The auxiliary power unit is a power source capable of supplying power to the USB device in a system different from that for power supply for the bus. The power control means controls supply by power supply of the bus and the auxiliary power so that in the state before the storage medium is engaged, power supply inside is made only to a minimum functional block based on the detection result by the detection means. (C)2004,JPO&NCIPI.

Description

(1) Technical field [0001] The present invention relates to a portable storage device, in particular to a portable storage device capable of transcribing digital image data of a digital camera to an optical storage medium and other types of storage medium. (2) Background technology [0002] In recent years, with the continuous improvement of the integration of its key parts - Charge Coupled Device (CCD) and CMOS, etc. - the digital camera (DSC) has made the image quality captured by the digital camera no less than that of the traditional film ( film) camera, its principle is to capture the optical signal through the charge-coupled device and then convert it into an electrical signal, and finally convert it into image data. Therefore, when using a digital camera, no film is needed, but a memory ( Memory) to store digital image data. After the digital camera digitizes the image, it is stored in the memory in the form of file data, and the data is transmitted through a card re...

AI Technical Summary

Problems solved by technology

However, as the number of pixels captured by digital cameras is increasing day by day, a digital photo usually costs hundreds of KB (kilobytes), and the capacity of the existing memory card (about 256MB) cannot Accommodates a large number of digital images

[0005] On the other hand, due to the high price, it is impossible for users to purchase a large number of memory cards for emergencies, but if the full data in the memory card is not first transferred to other storage media If the memory card cannot be used again and again, it will cause problems in use.

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