Source: http://www.google.com/patents/US20080172860?ie=ISO-8859-1
Timestamp: 2014-04-20 05:30:09
Document Index: 732624725

Matched Legal Cases: ['art 44', 'art 44', 'art 44', 'art 54', 'art 54', 'art 54']

Patent US20080172860 - Radio frequency IC tag and method for manufacturing same - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA small radio frequency IC tag which can obtain sufficiently long communication distance with radio wave in the microwave band even if an antenna is made small and the radio frequency IC tag is embedded in metal material. An O-shaped antenna is formed to narrow the width of a neck part in which an IC...http://www.google.com/patents/US20080172860?utm_source=gb-gplus-sharePatent US20080172860 - Radio frequency IC tag and method for manufacturing sameAdvanced Patent SearchPublication numberUS20080172860 A1Publication typeApplicationApplication numberUS 12/076,030Publication dateJul 24, 2008Filing dateMar 13, 2008Priority dateMay 30, 2005Also published asCN1873666A, CN100458838C, DE602005014852D1, EP1729366A1, EP1729366B1, US7365686, US7523541, US20060267843Publication number076030, 12076030, US 2008/0172860 A1, US 2008/172860 A1, US 20080172860 A1, US 20080172860A1, US 2008172860 A1, US 2008172860A1, US-A1-20080172860, US-A1-2008172860, US2008/0172860A1, US2008/172860A1, US20080172860 A1, US20080172860A1, US2008172860 A1, US2008172860A1InventorsIsao Sakama, Minoru AshizawaOriginal AssigneeHitachi, Ltd.Export CitationBiBTeX, EndNote, RefManReferenced by (2), Classifications (11), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetRadio frequency IC tag and method for manufacturing sameUS 20080172860 A1Abstract A small radio frequency IC tag which can obtain sufficiently long communication distance with radio wave in the microwave band even if an antenna is made small and the radio frequency IC tag is embedded in metal material. An O-shaped antenna is formed to narrow the width of a neck part in which an IC chip is mounted and widen the width of radiating electrodes constituting radiating part of radio wave. The radiating electrodes are formed into offset structure on right and left sides of the feeding point so that areas of right and left radiating parts of the feeding point in which the IC chip is mounted are unsymmetrical. Further, a ground electrode is provided so that a dielectric body is held between the radiating electrodes and the ground electrode and the radiating electrode is connected to the ground electrode at the side of the dielectric body.
forming a lead frame including a radiating electrode having a neck part and radiating parts of radio wave spreading on both sides of the neck part and a ground electrode connected to the radiating part; mounting the IC chip in the neck part; injecting resin into the radiating electrode; hardening the injected resin; coating a portion of the lead frame projecting outside of the radiating electrode with a protection agent; cutting the radiating electrode from the lead frame; and forming the ground electrode along the surface of the hardened resin. 2. The method according to claim 1, wherein the step of forming the lead frame comprises forming the radiating electrode into an offset structure so that areas of the radiating parts existing on both sides of the feeding part are nonsymmetrical.
CROSS-REFERENCE This is a divisional application of U.S. Ser. No. 11/300,282, filed Dec. 15, 2005, now allowed, which is incorporated by reference.
FIGS. 3A and 3B are sectional diagrams illustrating the radio frequency IC tag including the O-shaped antenna shown in FIG. 1 and the metal material in which the radio frequency IC tag is embedded, and
FIG. 3A is a sectional view of the radio frequency IC tag mounted in the metal material, FIG. 3B being a sectional view of the radio frequency IC tag;
FIGS. 20A to 20C are diagrams illustrating a radio frequency IC tag including the auxiliary antenna in a fifth embodiment of the present invention, and
FIG. 20A is a sectional view of the radio frequency IC tag including no auxiliary antenna, FIG. 20B being a sectional view of the radio frequency IC tag including the auxiliary antenna, FIG. 20C being a top view of the radio frequency IC tag shown in FIG. 20B;
(1) An Ni-plated layer and an Au-plated layer are adhered to a Cu layer or an Mo�Mn metalized layer.
(3) An Ni-plated layer and an Au-plated layer are adhered to a Cr�Cu alloy layer.
(4) An Ni�Cr alloy layer and an Au-plated layer are adhered to a Ta2N layer.
(6) A Pt layer and an Au-plated layer are adhered to an Ni�Cr alloy layer.
<First Variation> FIG. 8 is a diagram illustrating the first variation of the third embodiment according to the present invention in which a lot of radiating electrodes and ground electrodes are formed in a lead frame. As shown in FIG. 8, radiating electrodes 32, ground electrodes 33 and slits 34 are formed lengthwise of a beltlike lead frame 31 at equal intervals. The radiating electrodes 32 are formed to have semicircles that are unsymmetrical in the vertical direction and the ground electrodes 33 are formed into a circle. Both the radiating electrodes 32 and the ground electrodes 33 are connected to each other through a short beltlike lead frame 36. Further, feed holes 31 a are formed in the lead frame 31 at equal intervals. The lead frame 31 is moved at equal pitch while claws of a feeding mechanism of a chip mounter not shown are engaged with the feed holes 31 a so that IC chips 35 are mounted on the radiating electrode 32. The radiating electrodes 32 are cut off from the lead frame 31 one by one. The antenna part as formed above is sealed with epoxy resin in the substantially same manner as the second embodiment and the ground electrode 33 is subjected to forming so that the radio frequency IC tag is structured.
<Second Variation> FIG. 10 is a diagram illustrating the second variation of the third embodiment according to the present invention in which a lot of radiating electrodes and ground electrodes are formed in a lead frame. The second variation is different from the first variation in that the radiating electrodes 32 a are constituted by only upper semicircle instead of the semicircular radiating electrodes that are unsymmetrical in the vertical direction. Even the radiating electrodes 32 a having such shape can be used to form the ground electrodes 33 into the same circle as the first variation. The process for manufacturing the radio frequency IC tag by using the lead frame of the second variation is the same as the flow chart of FIG. 9.
<Third Variation> FIG. 11 is a diagram illustrating the third variation of the third embodiment according to the present invention including a radiating electrode having right and left unsymmetrical semicircles and a circular comblike ground electrode. As shown in the third variation of FIG. 11, even when the circular ground electrode 33 a having a lot of slits is disposed opposite to the radiating electrode 32 having right and left unsymmetrical semicircles, the radio frequency IC tag of the present invention can be formed. In this manner, by providing the ground electrode 33 a having the lot of slits, even if there is unevenness in the bottom of the hole of the metal material 14 connected to the ground electrode 33 a as shown in FIG. 3, for example, the unevenness can be absorbed by the lot of slits of the ground electrode 33 a and accordingly the adhesive properties between the ground electrode 33 a and the metal material 14 can be improved. The process for manufacturing the radio frequency IC tag by using the lead frame of the third variation is the same as the flow chart of FIG. 9.
<Fourth Variation> FIG. 12 is a diagram illustrating the fourth variation of the third embodiment according to the present invention including a semicircular radiating electrode disposed only on the left side and a circular comblike ground electrode. As shown in the fourth variation of FIG. 12, even when a circular ground electrode 33 a having a lot of slits is disposed opposite to the semicircular radiating electrode 32 disposed only on the left side, the radio frequency IC tag of the present invention can be formed. In this manner, by providing the ground electrode 33 a having the lot of slits, even if there is unevenness in the bottom of the hole of the metal material 14 connected to the ground electrode 33 a as described in connection with FIGS. 3A and 3B, for example, the unevenness can be absorbed by the lot of slits of the ground electrode 33 a and accordingly the adhesive property between the ground electrode 33 a and the metal material 14 can be improved. The process for manufacturing the radio frequency IC tag by using the lead frame of the fourth variation is the same as the flow chart of FIG. 9.
<Fifth Variation> FIG. 13 is a diagram illustrating the fifth variation of the third embodiment according to the present invention including a radiating electrode having vertically unsymmetrical semicircles and a radial ground electrode. As shown in the fifth variation of FIG. 13, even when the ground electrode 33 b having a plurality of radial ends d disposed equi-angularly about a circular portion c is disposed opposite to the radiating electrode 32 having vertically unsymmetrical semicircles, the radio frequency IC tag of the present invention can be formed. Consequently, the ground electrode 33 b can exhibit flexibility and even if there is unevenness in the bottom of the hole of the metal material 14 as described in connection with FIGS. 3A and 3B, for example, the unevenness can be absorbed and accordingly the adhesive property between the ground electrode 33 a and the metal material 14 can be improved.
<First Variation> FIG. 18 is a plan view illustrating radiating electrodes and a ground electrode of an H-shaped antenna of the first variation of the fourth embodiment according to the present invention. As shown in FIG. 18, the H-shaped antenna 41 includes right and left unsymmetrical radiating electrodes 42 a and 42 b and an elongated neck part 44 connecting the radiating electrodes 42 a and 42 b at the middle portion thereof. Further, a slit 45 is formed from the elongated neck part 44 into the radiating electrode 42 a. An IC chip 46 is mounted to straddle the slit 45 in the elongated neck part 44 and the respective terminals of the IC chip 46 are connected to electrodes on both sides of the slit 45. A rectangular ground electrode 43 having a large area is formed on the side of the radiating electrode 42 b. Since the ground electrode 43 is rectangular, it is not necessary to narrow the lead frame as the lead frame 36 connecting the radiating electrode 32 and the ground electrode 33 of the O-shaped antenna of FIG. 8 and the lead frame for connecting the radiating electrode 42 b and the ground electrode 43 of the H-shaped antenna 41 can be formed with the same width as the radiating electrode 42 b as shown by two one-dot chain lines.
<Second Variation> FIG. 19 is a plan view illustrating radiating electrodes and a ground electrode of a polygonal antenna of the second variation of the fourth embodiment according to the present invention. As shown in FIG. 19, the polygonal antenna 51 (hexagonal antenna in the example of FIG. 19) includes right and left unsymmetrical radiating electrodes 52 a and 52 b and an elongated neck part 54 connecting the radiating electrodes 52 a and 52 b at the middle portion thereof. Further, a slit 55 is formed from the elongated neck part 54 into the radiating electrode 52 a. An IC chip 56 is mounted to straddle the slit 55 in the elongated neck part 54 and the respective terminals of the IC chip 56 are connected to electrodes on both sides of the slit 55. A hexagonal ground electrode 53 having a large area is formed on the side of the radiating electrode 52 b. Since the ground electrode 53 is hexagonal, it is not necessary to narrow the lead frame as the lead frame 36 connecting the radiating electrode 32 and the ground electrode 33 of the O-shaped antenna of FIG. 8 and the lead frame for connecting the radiating electrode 52 b and the ground electrode 53 can be formed with the same width as a side of the radiating electrode 52 b as shown by two one-dot chain lines.
Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7701350 *Apr 27, 2007Apr 20, 2010Hitachi, Ltd.IC tag and method for fabricating the sameUS8487831Mar 31, 2008Jul 16, 2013Nitta CorporationWireless communication-improving sheet member, wireless IC tag, antenna, and wireless communication system using the same* Cited by examinerClassifications U.S. Classification29/600, 29/841, 29/827, 29/854International ClassificationH01P11/00, H05K3/30, H01R43/00Cooperative ClassificationH01Q9/285, H01Q1/22European ClassificationH01Q9/28B, H01Q1/22Legal EventsDateCodeEventDescriptionSep 26, 2012FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google