|
Mobile Phone Patent Abstract
An improved structure of a multi-frequency antenna for a mobile
phone, the antenna is placed in an inner insulation sleeve to position
a coil in cooperation with a receiving seat and is provided with
a contact piece connected with one end thereof to the lower portion
of the receiving seat and exposed partially to the outside; an outer
sleeve is adapted for slipping over the inner insulation sleeve
having been assembled with internal members, to make one end of
the coil abut against the inner top surface of the outer sleeve,
and the bottom end of the coil abut against the surface of the receiving
seat; the coil includes in its length a sparse coil section and
a dense coil section, the coil forms a multi-frequency antenna together
with the receiving seat and the contact piece. The present invention
can render manufacturing of multi-frequency antennae fast and convenient
under the condition of using the improvement in the known antenna
structure and known processing procedure of assembling.
Mobile Phone Patent Claims
Having now particularly described and ascertained the nature of
our said invention and in what manner the same is to be performed,
we declare that what we claim are:
1. An improved structure for a multi-frequency antenna for a mobile
phone, wherein said antenna is placed in an inner insulation sleeve
to position a coil in cooperation with a receiving seat and is provided
with an elastic conductive member connected with one end thereof
to a lower portion of said receiving seat and exposed partially
to the outside; an outer sleeve is slipped over said inner insulation
sleeve, said outer sleeve having internal elements including said
receiving seat, said coil and said elastic conductive member, such
that one end of said coil abuts against an inner top surface of
said outer sleeve, and a bottom end of said coil abuts against a
surface of said receiving seat; said coil including along a length
thereof, a sparse coil section and a dense coil section, such that
said coil forms a multi-frequency antenna together with said receiving
seat and said elastic conductive member.
2. The improved structure for a multi-frequency antenna for a mobile
phone as defined in claim 1, wherein said dense coil section and
said sparse coil section have a ratio of length of 1:2.
3. The improved structure for a multi-frequency antenna for a mobile
phone as defined in claim 1, wherein the ratio of the spacing of
rings on said dense coil section and said sparse coil section is
1:3.
4. The improved structure for a multi-frequency antenna for a mobile
phone as defined in claim 1, wherein said conductive member is an
elastic contact piece, one end of said elastic contact piece being
positioned by a bottom surface of said receiving seat and having
an exposed bottom end.
5. The improved structure for a multi-frequency antenna for a mobile
phone as defined in claim 4, wherein said elastic contact piece
is extended to form a vertical section, said exposed bottom being
on an end of said vertical section and tilted to form a first bending
section; then a bottom end of said first bending section is bent
backwardly to form a second bending section; thereafter, said second
bending section is bent to form a third bending section which is
in the direction a large angle relative to said second bending section,
said third bending section bent backwardly to abut on said first
bending section.
6. The improved structure for a multi-frequency antenna for a mobile
phone as defined in claim 1, wherein said exposed elastic conductive
member projects from a threaded connecting section below said receiving
seat.
7. The improved structure for a multi-frequency antenna for a mobile
phone as defined in claim 2, wherein the ratio of the spacing of
rings on said dense coil section and said sparse coil section is
1:3.
Mobile Phone Patent Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to an improved structure of a
multi-frequency antenna for a mobile phone, and especially to an
antenna of which the novel designs of a coil and its related electric
connecting elements make the antenna suit mobile phones of various
frequencies under the situation of convenient manufacturing and
assembling.
2. Description of the Prior Art
Antennae for mobile phones using only a single frequency (e.g.
900 MHZ) can suit two different frequencies (900 MHZ and 1800 MHZ)
when it uses a frequency matching structure. While the antennas
for mobile phones available presently sometimes use even higher
frequencies, such as 1850 MHZ-1990 MHZ.
In such two-frequency antennas, generally coils of different diameters
are used for matching, or metallic conductive pieces of in the shape
of waveforms are used in lieu of coils, such as those shown in FIGS.
1 and 2. The metallic conductive piece 10 therein is pressing formed
from thin metallic sheet, and includes generally a lateral vertical
waveform section 11 and a horizontal waveform section 12. The metallic
conductive piece 10 is a plane conductor with a specific width when
it is pressing formed (as shown in FIG. 2), it can then be wrapped
around the outer peripheral surface 14 of a post 13 of an antenna.
By virtue that the mutual contiguous lateral vertical waveform
section 11 and horizontal waveform section 12 have to be used, the
conventional two-frequency antenna structure is made from thin metallic
sheet, thereby, precision die is required to pressing forming the
whole metallic conductive piece, and this results higher cost. And
the plane metallic thin sheet has to be wrapped around the post
in processing; it is bothersome for manufacturing. And more, using
of such a two-frequency antenna with large changing, the original
production procedure must be changed, a new die has to be opened,
working hour for manufacturing and assembling is increased, thereby,
cost of production must be largely increased.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a multi-frequency
antenna for a mobile phone, and especially to a multi-frequency
antenna rendering manufacturing and assembling thereof faster and
more convenient for largely reducing cost of production must.
To get the above stated object, the present invention is provided
with a coil which is dense and also sparse, the coil is positioned
between the inner top surface of an outer sleeve and a receiving
seat to form an electric conducting system for signal receiving
and emitting of the antenna in cooperation with a contact piece.
In the longitudinal length of the whole coil, spacing between every
two rings of the coil is smaller, this is the dense section of the
coil, while the remaining part is the sparse section; in this mode,
the coil can be a multi-frequency sensing member after it is assembled.
The abovementioned dense section and sparse section have a ratio
of length 1:2, the ratio of the spacing of their rings is 1:3.
The dense and sparse coil can be placed in the hollow interior
of an inner insulation sleeve of the antenna, the bottom most ring
of the coil is mounted in a metallic receiving seat in a bottom
hole of the inner insulation sleeve, the topmost ring thereof is
abutted against the inner top surface of the outer sleeve slipping
over the inner insulation sleeve. In cooperation with an elastic
contact piece mounted on the bottom of the inner insulation sleeve,
the coil can be assembled in a mobile phone and used as the signal
receiving and emitting antenna device.
The present invention will be apparent in its novelty and other
characteristics after reading the detailed description of the preferred
embodiment thereof in reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view showing a conventional two-frequency
antenna;
FIG. 2 is a plane view showing spreading out of a conductive piece
in FIG. 1;
FIG. 3 is a perspective view showing a preferred embodiment of
the present invention;
FIG. 4 is an analytic perspective view of the elements shown in
FIG. 3;
FIG. 5 is sectional view taken from FIG. 4.
FIG. 6 is another sectional view taken from FIG. 4.
FIG. 7 is an enlarged plane view of a coil of the present invention;
FIG. 8 is a test chart for the coil of FIG. 7; and
FIG. 9 is a schematic view showing assembling of the present invention
on a mobile phone.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 3-6 in the first place which shows a miniature
fixed type antenna for a mobile phone as an example, the antenna
is comprised mainly of an inner insulation sleeve 20, an outer sleeve
30 able to slip over the inner insulation sleeve 20, a receiving
seat 40 and a coil 50 between the two sleeves and an exposed contact
piece 60. In this preferred embodiment which is convenient for explanation,
the coil 50 is matched with the related electric connecting elements
such as the receiving seat 40 and the exposed contact piece 60 and
is used as an electric conducting system for signal receiving and
emitting of the antenna. In other embodiments however, it can also
be connected singly with a receiving seat provided with a threaded
connecting end to form the electric conducting system for signal
receiving and emitting of the antenna.
The inner insulation sleeve 20 is provided near the bottom end
thereof with a threaded connecting section 21 and a slot 22 on one
side of and below the threaded connecting section 21 for mounting
a conductive member or contact piece 60, the contact piece 60 is
elastic and is partially exposed after mounting. The inner insulation
sleeve 20 is provided with a hole 23 having a larger diameter opened
to the top thereof and with a hole 24 having a smaller diameter
opened to the bottom thereof, and a shoulder 25 is formed between
the two holes.
The receiving seat 40 can be placed in the hole 23 (having the
larger diameter) of the inner insulation sleeve 20 to be abutted
against the shoulder 25, and is provided on the upper surface thereof
with a receiving disk 41 with a suitable diameter, and further is
provided on the lower surface thereof with a guiding post 42. The
receiving disk 41 can be abutted against one end of the coil 50,
and the lower guiding post 42 can be extended into the hole 24 having
the smaller diameter to cooperatively press and position the upper
end of the contact piece 60.
The assembled structure of the inner insulation sleeve 20 and the
internal members has the same operation procedure as that for assembling
such miniature fixed antennae. The inner insulation sleeve 20 of
the assembled internal members then can be slipped in the outer
sleeve 30 having an inner top surface 34 and a down facing inner
hole 32, the outer sleeve 30 can be slipped over the most part of
the external peripheral surface of the inner insulation sleeve 20,
and keeps the threaded connecting section 21 of the inner insulation
sleeve 20 and the contact piece 60 exposed ready for connecting.
After the inner insulation sleeve 20 and the outer sleeve 30 are
slipped one over the other, a joint area 33 between them can be
fixedly sealed with adhesive or by some melting connection method
which is discovered recently. Under the state of combination of
the two sleeves, the upper end of the coil 50 is abutted against
the inner top surface 34 of the outer sleeve 30, and the bottom
end of the coil 50 is abutted against the receiving disk 41.
The contact piece 60 is extended for a preset vertical length in
the embodiment shown in order to match and press for contacting
with the coil 50. As shown in FIGS. 4 and 6, the bottom end of the
vertical section tilts slightly (about 20 degrees relative to the
vertical section) to form a first bending section 61; then the bottom
end of the first bending section 61 is bent backwardly to form a
second bending section 62 which is in the direction about 50 degrees
relative to the first bending section 61; thereafter, the second
bending section 62 is bent to form a third bending section 63 which
is in the direction about 100 degrees relative to the second bending
section 62; lastly, the third bending section 63 is bent backwardly
to form a fourth bending section 64 which is abutted on the first
bending section 61.
Referring to FIG. 7, the coil 50 includes in its length a sparse
coil section A and a dense coil section B, the length of the sparse
coil section A is about twice the length of the dense coil section
B in this preferred embodiment. The spacing C between every two
rings of the sparse coil section A is about thrice the length of
the spacing D of the dense coil section B. In other words, if the
length of a coil (i.e., A+B) of such kind used generally is 16.2
mm, when the diameter E of the rings is 5.3 mm, the diameter of
the wire of the coil is 0.6 mm, then the length of A is 10.8 mm,
and the length of B is 5.4 mm. In the embodiment shown, the spacing
C between every two rings of the sparse coil section A is about
4.3 mm, while the spacing D between every two rings of the dense
coil section B is about 1.25 mm. The sizes and ratios stated above
are only for illustration of the preferred embodiment. When the
coil is used in a miniature fixed antenna of a different brand and
style, the sparse coil section can obtain its ideal size and ratio
in the test in the primary assembling.
FIG. 8 shows a test chart for the abovementioned coil 50. In the
chart, the ordinate shows standing wave ratio (SWR), while the abscissa
shows frequency (MHZ). The above stated antenna structure is used
for testing, in the test chart, four test points S.sub.1, S.sub.2,
S.sub.3, S.sub.4 are respectively located as below: S.sub.1 is located
between 890-915 MHZ, S.sub.2 is located between 935-960 MHZ, S.sub.3
is located between 1710-1785 MHZ, while S.sub.4 is located between
1805-1880 MHZ; their standing wave ratios are all below 2, in this
case, they are functionally quite ideal. Thereby, the present invention
can have an extreme ideal multi-frequency antenna for the mobile
phone 90 as shown in FIG. 9 not only suiting 900-1800 MHZ, but also
suiting 1850-1990 MHZ.
In conclusion, the present invention can render manufacturing of
multi-frequency antennas fast and convenient under the condition
of using the improvement in the known antenna structure and known
processing procedure of assembling. It makes cost of production
lowered, and suits mass production in a factory; thereby it is industrial
valuable. |