Apparatus for attaching adhesive tape to lead-on-chip leadframes

• US 6,012,502 A
• Filed: 07/24/1997
• Issued: 01/11/2000
• Est. Priority Date: 07/31/1995
• Status: Expired due to Term

• Current Assignee: Medix Limited
• Original Assignee: Micron Technology, Inc.
• Inventors: Clifford, Scott, VanNortwick, John
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): GRAY, LINDA LAMEY
• Application Number:
  US08/899,729
• Time in Patent Office: 901 Days
• Field of Search: 156/511, 156/515, 156/518, 156/521, 156/530, 156/562, 156/583.1, 156/499, 156/560, 156/261, 156/263, 156/299
• US Class Current: 156/518
• CPC Class Codes: B65H 35/0013 and applying the article or the web by adhesive to a surface B65H35/002 takes precedence
• CPC Class Codes: B65H 35/006 with means for delivering a predetermined length of tape
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/83101 as prepeg comprising a layer connector, e.g. provided in an insulating plate member
• CPC Class Codes: H01L 23/4951 Chip-on-leads or leads-on-chip techniques, i.e. inner lead fingers being used as die pad
• CPC Class Codes: H01L 24/97 the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/14 Integrated circuits
• CPC Class Codes: Y10T 156/107 Punching and bonding pressure application by punch
• CPC Class Codes: Y10T 156/1074 Separate cutting of separate sheets or webs
• CPC Class Codes: Y10T 156/1092 All laminae planar and face to face
• CPC Class Codes: Y10T 156/125 Plural severing means each acting on a different work piece
• CPC Class Codes: Y10T 156/1326 Severing means or member secured thereto also bonds
• CPC Class Codes: Y10T 156/1339 Delivering cut part in sequence to serially conveyed articles
• CPC Class Codes: Y10T 156/1378 Cutter actuated by or secured to bonding element
• CPC Class Codes: Y10T 156/1754 At least two applied side by side to common base

Abstract

An apparatus for attaching adhesive tape to a leadframe. The apparatus includes: a support frame; an adhesive tape on a reel mounted to the frame; a stationary cutter base mounted to the frame with an opening therethrough having a peripheral outline where the opening receives a leading terminal end of the tape and a portion of the tape following the leading terminal end, a channel in the base to guide the tape into the opening, and a block to hold the tape in the channel and in the opening; and a cutter which moves through the opening to cut a decal from the tape within the opening and to apply the decal to a leadframe. The cutter and the decal having an outline substantially matching the peripheral outline of the opening such that wasted tape is eliminated.

Claims

1. An apparatus for attaching adhesive tape to a leadframe comprising:

a support frame;

an adhesive tape at least partially contained on a reel rotatably mounted to the support frame;

a pair of feed rollers attached to the support frame and configured to index the tape;

a stationary cutter base mounted to the support frame comprising an opening therethrough having a peripheral outline and configured to receive a leading terminal end of the tape and a portion of the tape following the leading terminal end, a channel therein configured to guide the tape into the opening, and a block proximate the channel configured to hold the tape in the channel and in the opening; and

a cutter configured to move through the opening to cut a decal from the tape within the opening and to apply the decal to the leadframe, the cutter and the decal having an outline substantially matching the peripheral outline of the opening.

2. The apparatus of claim 1 further comprising a lead in member on the channel configured to guide the tape through the channel into the opening.

3. The apparatus of claim 1 further comprising a second channel in the base, a second opening through the base having the peripheral outline, and a second cutter configured to move through the second opening to cut a second decal from a second portion of a second tape held within the second opening where the second decal has a second decal outline substantially matching the peripheral outline and to apply the second decal to the leadframe.

4. The apparatus of claim 1 further comprising a leadframe handling apparatus for positioning the leadframe proximate to the opening.

5. An apparatus for attaching adhesive tape to a leadframe comprising:

a support frame;

a first adhesive tape at least partially contained on a first reel and and a second adhesive tape at least partially contained or a second reel, the first reel and the second reel rotatably mounted to the support frame;

a cutter assembly on the support frame, the cutter assembly comprising;

a stationary cutter base;

a first opening through the base having a first peripheral outline and configured to receive a first leading terminal end of the first tape and a portion of the first tape following the first leading terminal end for cutting;

a second opening through the base having a second peripheral outline and configured to receive a second leading terminal end of the second tape and a portion of the second tape following the second leading terminal end for cutting;

a first cutter configured to move through the first opening to cut a first decal from the first tape within the first opening and to apply the first decal to the leadframe, the first cutter and first decal having a first outline substantially matching the first peripheral outline;

a second cutter configured to move through the second opening to cut a second decal from the second tape within the second opening and to apply the second decal to the leadframe, the second cutter and the second decal having a second outline substantially matching the second peripheral outline.

6. The apparatus of claim 5, wherein the first peripheral outline and the second peripheral outline are generally rectangular shaped.

7. An apparatus for attaching adhesive tape to a leadframe comprising:

a support frame comprising a first guide channel;

a feed mechanism on the support frame configured to move an adhesive tape through the first guide channel;

a stationary cutter base mounted to the support frame comprising a second guide channel in the base, a block on the second guide channel, and an opening through the base having a peripheral outline, the second guide channel and the block configured to enclose and guide a leading terminal end of the tape and a portion of the tape following the leading terminal end into the opening and to hold the tape during cutting of the within the opening; and

a cutter configured to move through the opening to cut a decal from the tape within the opening and to apply the decal to the leadframe, the cutter and the decal having an outline substantially matching the peripheral outline of the opening such that the decal can be aligned with the leadframe and with the cutter by the opening.

8. The apparatus of claim 7 further comprising a third guide channel in the base, a second block proximate the third guide channel, a second opening through the base, and a second cutter configured to move through the second opening to cut a second decal from a second portion of a second tape held within the second opening where the second decal has a second decal outline substantially matching the peripheral outline and to apply the second decal to the leadframe.

9. The apparatus of claim 7 wherein the cutter comprises a vacuum passage for attaching the decal to the cutter.

10. An apparatus for attaching adhesive tape to a leadframe comprising:

a support frame;

a feed mechanism on the support frame configured to move a first adhesive tape and a second adhesive tape along the support frame;

a stationary cutter base mounted to the support frame comprising spaced first and second guide channels in the base, a block on the channels, and a pair of spaced first and second openings through the base where the first opening has a first peripheral outline and the second opening has a second peripheral outline, the channels and the block configured to (a) enclose and guide a first leading terminal end of the first tape and a portion of the first tape following the first leading terminal end into the first opening, (b) enclose and guide a second leading terminal end of the second tape and a portion of the second tape following the second leading terminal end into the second opening, (c) hold the first tape during cutting of the first tape within the first openings, and (d) hold the second tape during cutting of the second tape within the second opening;

a first cutter configured to move through the first opening to cut a first decal from the first tape within the first opening and to apply the first decal to the leadframe, the first cutter and the first decal having an outline substantially matching the first peripheral outline such that the first decal can be aligned with the leadframe and with the first cutter by the first opening; and

a second cutter configured to move through the second opening to cut a second decal from the second tape within the second opening and to apply the second decal to the leadframe, the second cutter and the second decal having an outline substantially matching the second peripheral outline such that the second decal can be aligned with the leadframe and with the second cutter by the second opening.

11. The apparatus of claim 10 wherein the first cutter and the second cutter each comprise a vacuum passage.