Digital card-structure

Details Digital card-structure Digital card-structure

2003-03-12

2004-11-16

Lee, Michael G. (Department: 2876)

Registers

Records

Conductive

C235S486000, C235S441000

Reexamination Certificate

active

06817533

ABSTRACT:

BACKGROUND OF THE INVENTION
1) Field of the Invention
The present invention provides a new structure for digital cards, which are equipped with double-sided contacts and an electronic write-protection.
2) Description of the Prior Art
Digital cards, also known as smart cards or memory cards, form the newest generation of data storage media. Their features include their small size, a high storage volume and a fast transfer speed. These cards are therefore the ideal choice as storage and transport media for multimedia data.
For the structure of conventional digital cards, please refer to FIG.
1
and FIG.
1
A. The digital card
10
comprises a main body
11
, with said main body
11
equipped with a number of contacts attached to one side. To prevent the digital card
10
from overwriting data by mistake, the main body possesses a write-protection switch
20
made of plastic. This write-protection switch
20
uses a card hook
21
to hook up to an edge formed in an grove
13
of the main body
11
. The write-protection switch
20
can be moved on an elevation
15
inside of the grove
13
. The write protected or write enabled state of the digital card
10
is determined by the position of the write-protection switch
20
.
Conventional digital cards have two weaknesses:
The contacts
12
are only attached to one side, therefore the amount of data which can be transferred is restricted, and the digital card is unable to use its full potential.
The write-protection switch
20
is made of plastic and will lose quality after long use, resulting in malfunctions of the card.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide a structure for digital cards, which comprises a main body, to which contacts are attached on both sides, and which furthermore possesses an electronic write-protection, wherein the contacts on both sides are used to raise the transfer efficiency, while the write-protection provides for a more secure possibility to define the card as write protected or write enabled.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
shows a full display of a conventional digital card.
FIG. 1A
shows a display of the part labeled A—A in FIG.
1
.
FIGS. 2A and 2B
show three-dimensional displays of both sides of one practical example for the present invention.
FIG. 3A
shows another three-dimensional display of one practical example for the present invention.
FIG. 3B
shows a three-dimensional display for the parts on the back side of the practical example shown in FIG.
3
A.
FIG. 4
shows a full display of the practical example shown in FIG.
3
.
FIG. 4A
shows a display of the part labeled A—A in FIG.
4
.
FIG. 4B
shows a display of the part labeled B—B in FIG.
4
.
FIG.
5
A and
FIG. 5B
show three-dimensional displays of both sides of another practical example for the present invention.


REFERENCES:
patent: 4565922 (1986-01-01), Anderson
patent: 4737602 (1988-04-01), Yamamoto
patent: 4774399 (1988-09-01), Fujita et al.
patent: 6386459 (2002-05-01), Patrice et al.
patent: 6399906 (2002-06-01), Sato et al.
patent: 6616053 (2003-09-01), Kondo et al.

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