Tape for electronic devices with reinforced lead crack

Abstract

Provided is a tape for electronic devices with lead crack and a method of manufacturing the tape. According to the present invention, by forming a cutting portion on a narrow circuit pattern to be connected from an inner lead to an outer lead and further forming the cutting portion within a resin application portion, the problem of occurrence of cracks along a width of a narrow wiring can be avoided. The tape may include a first lead and a second lead formed on a dielectric substrate and a cutting portion formed on one of the first lead and the second lead wherein the cutting portion is formed within a resin application portion.

Claims

1. A tape for electronic devices comprising: a dielectric substrate; a resin application portion corresponding to a chip mounting portion formed on the dielectric substrate; an electronic device chip mounted on the chip mounting portion, and resin for burying the electronic device chip in the resin application portion; a first lead having a plurality of first lead patterns and disposed on the dielectric substrate and connected to a terminal outside the dielectric substrate; and a second lead having a plurality of second lead patterns and disposed on the resin application portion of the dielectric substrate and connected to the electronic device chip; wherein the second lead includes a cutting portion disposed in the resin application portion, wherein the cutting portion connects the first lead and the second lead in a cutting form; wherein the cutting portion includes a plurality of connecting patterns connecting the plurality of first lead patterns and the plurality of second lead patterns, respectively; wherein the plurality of connecting patterns includes a first connecting pattern, a second connecting pattern, and a third connecting pattern; wherein the first connecting pattern has a first portion having a first angle of inclination with respect to the plurality of first lead patterns and a second portion extended in a longitudinal direction of the plurality of first lead patterns, wherein the second connecting pattern has a third portion having a second angle of inclination with respect to the plurality of first lead patterns and a fourth portion extended in a longitudinal direction of the plurality of first lead patterns, wherein the third connecting pattern is only straightly formed for directly connecting the first lead and the second lead in the longitudinal direction of the plurality of first lead patterns, wherein the first angle of inclination is different from the second angle of inclination, wherein the third connecting pattern is positioned outermost of the plurality of connecting patterns in a direction transverse to the longitudinal direction of the plurality of first lead patterns, wherein each of the plurality of second lead patterns has a width smaller than a width of each of the plurality of first lead patterns, wherein the number of the plurality of first lead patterns is different from the number of the plurality of second lead patterns, wherein the second portion of the first connecting pattern has a plurality of first sub-connecting patterns branching from one first lead pattern of the plurality of first lead patterns, wherein the fourth portion of the second connecting pattern has a plurality of second sub-connecting patterns branching from another first lead pattern of the plurality of first lead patterns, wherein a position of an end of each of the plurality of first sub-connecting patterns is different from each other, and wherein a position of an end of each of the plurality of second sub-connecting patterns is different from each other.

2. The tape for electronic devices of claim 1, wherein a width of the first lead and a width of the second lead are different from each other.

3. The tape for electronic devices of claim 2, wherein a pattern width of the first lead is wider than that of the second lead.

4. The tape for electronic devices of claim 1, wherein the resin comprises a potting material having viscosity.

5. The tape for electronic devices of claim 1, wherein the resin comprises epoxy.

6. The tape for electronic devices of claim 5, wherein the resin further comprises a curing material or an inorganic filler.

7. The tape for electronic devices of claim 1, wherein the dielectric substrate comprises a polyimide film.

8. The tape for electronic devices of claim 1, wherein a plating treatment layer having a material different from those of the first lead and the second lead is disposed on the first lead and the second lead.

9. The tape for electronic devices of claim 8, wherein the plating treatment layer is made of one material selected from the group consisting of Cu, Ni, Pd, Au, Sn, Ag and Co, and binary and ternary alloys thereof.

10. The tape for electronic devices of claim 9, wherein the plating treatment layer has a multi-layer structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

(2) FIG. 1 is a partly exploded plain view of a wiring pattern of a tape according to an embodiment of the present invention; and

(3) FIG. 2 is a partly exploded plain view of the wiring pattern as shown in FIG. 1.

REFERENCE NUMERALS

(4) 110: base film 111: sprocket hole 120: wiring pattern 121: first lead 122: second lead 123: connecting portion 130: resin application portion 140: cutting portion (pattern inflection point formation portion) 141: first lead pattern 142: second lead pattern 143: connecting pattern

BEST MODE

(5) Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Wherever possible, the same reference numerals will be used to refer to the same elements throughout the specification, and a duplicated description thereof will be omitted. It will be understood that although the terms first, second, etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element.

(6) FIG. 1 is a partly exploded plain view of a wiring pattern of a tape according to an embodiment of the present invention, and FIG. 2 is a partly exploded plain view of the wiring pattern as shown in FIG. 1.

(7) A tape according to the present embodiment of the invention, as shown FIG. 1, may include a first lead 121 and a second lead 122 formed on a dielectric substrate 110, and a cutting portion 140 formed on one of the first lead and the second lead. The cutting portion 140 according to the present invention refers to as a cutting-form connecting pattern (143 in FIG. 2) on a connecting portion of the first lead 121 and the second lead 122. The dielectric substrate 110 may use a base film formed with dielectric material such as polyimide resin.

MODE FOR INVENTION

(8) Furthermore, referring to a partly exploded a wiring pattern 120 as shown in FIG. 1, a tape according to the present embodiment of the invention may include a portion for a chip to be mounted and a resin application portion 130 for burying an electronic device chip. Specially, the cutting portion 140 according to the present invention may be arranged on the resin application portion.

(9) Further, detailed configurations of the tape according to the present embodiment of the invention will be described, referring to FIGS. 1 and 2.

(10) A conductive thin film such as copper foil may be formed on a dielectric substrate 110 and then a wiring pattern may be formed using a photo etching. Here, a plurality of sprocket holes 111 may be formed at a predetermined distance on both edges of the dielectric substrate 110.

(11) Meanwhile, the wiring pattern 120 may include a second lead 122 to be connected electrically to a semiconductor chip using an inner lead bonding (ILB), a first lead 121 for connecting electrically to a terminal outside the substrate, and a connection portion 123 formed as a connecting pattern for connection the first lead 121 and the second lead 122.

(12) Additionally, the second lead 122 is formed to have relatively narrow width in a consideration of being connected to connecting terminals of a fine pitch of a semiconductor chip and the first lead 121 is formed to have a relatively wide width in a consideration of being connected to a terminal outside a substrate, not corresponding directly to fine pitches of a semiconductor chip. The connecting portion 123 may be formed as a cut-form to have a predetermined length for connecting the second lead 122 having a narrow width and the first leads 121 having a wide width.

(13) Here, the second lead 122 may be formed as a wiring pattern to be connected from an inner lead to an outer lead, having a narrow wiring width. Accordingly, in a case where the wiring pattern is formed straightly for connecting directly the first lead and the second lead, as in the prior art, a bending property may be weak and thereby creating cracks.

(14) In order to solve this drawback, in the present embodiment of invention, by forming the cutting portion 140 on a circuit pattern of the second lead 122 to widen a wiring width and by forming the cutting portion 140 within the resin application portion 130, and without being a bending portion, the crack problem may be solved or avoided.

(15) In more detailed description of the circuit pattern of the second lead 122, as shown in FIG. 2, a second lead pattern 142 formed to have relatively narrower width than that of a first lead pattern 141, a first lead pattern 141 formed to have relatively wider width than that of the second lead pattern 142 and a connection pattern 143 for connecting a portion between the first lead pattern 141 and the second lead pattern 142 as a cutting form based on the cutting portion 140 are provided. At this time, the cutting portion 140 may be formed within the resin application portion 130 and without being a bending portion.

(16) By forming the cutting portion in a place where a wiring width is relatively narrower than other places, that is, a circuit pattern of the second lead 122 to be connected from the first lead (for example, inner lead) to the second lead (for example, outer lead), and forming it within the resin application portion after an IC bonding, and designing a lead wiring pattern of two times as an existing lead wiring pattern in a case of an outer part of the resin application portion not to be IC bonded, lead crack can be avoided.

(17) Furthermore, by forming further a plating treatment layer as a single layer or multi layer on a circuit pattern surface of the first lead and the second lead, using one, binary alloy or ternary alloy of Cu, Ni, Pd, Au, Sn, Ag, Co, a circuit pattern can be protected and conductivity of the lead wiring pattern can be improved.

Manufacturing Method of a Tape for Electronic Devices

(18) Referring to FIGS. 1 and 2, a manufacturing method of a tape for electronic devices according to another embodiment of the present invention will be described.

(19) First, a conductive thin film may be formed on one surface of a dielectric substrate 110. At this time, the conductive thin film may be formed as a sputtered-metal layer on a whole surface of the dielectric film. The metal layer may be formed by sputtering one of Cu, Ni, Pd, Au, Sn, Ag, Co. Further, a plating treatment layer may be further formed as a single layer or multi layer using one, binary alloy or e alloy of Cu, Ni, Pd, Au, Sn, Ag, Co.

(20) Next, a wiring pattern may be formed by etching selectively the conductive thin film wherein a cutting portion 140 may be formed on a circuit pattern to be connected from the first lead (inner lead) to the second lead (outer lead), having relatively a narrow wiring width.

(21) Here, the circuit pattern may be separated into the first lead pattern 141 and the second lead pattern 142, based on the cutting portion 140, and may include a connecting pattern for cutting and connecting a portion between the first and second leads 141, 142, based on the cutting portion 140. At this time, a wiring width of the first lead pattern 141 may be wider than that of the second lead pattern 142. The cutting portion 140 may be formed within the resin application portion and without being a bending portion.

(22) According to a tape for electronic devices and a method of the tape of the present invention, by forming a cutting portion on a narrow circuit pattern to be connected from a first lead to a second lead and forming the cutting portion within a resin application portion and without being a bending portion, the technical object of the present invention can be achieved.

(23) The tape according to the present embodiment of the invention may be packaged by applying resin on an electronic device chip to be mounted within the resin application portion 130. The resin to be applied on the resin application portion 130 may be potting material having viscosity, comprising epoxy, epoxy resin, curing material, or inorganic filler.

(24) While the invention has been shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.