Photoresist transfer pads
View Patent ↗A resist transfer pad and method of use are described for forming a uniform photoresist on the surface of a workpiece such as a slider. The resist transfer pad includes a layer of cured polydimethylsiloxane (PDMS) on a cushioning layer, e.g. silicone rubber, and an optional stiffening layer. The sliders are preferably mounted on a carrier or pallet. In one preferred embodiment the loaded resist transfer pads are applied to the slider surface by roll lamination where the loaded resist transfer pad is transported by a roller system using a cover-tape and pressed against the slider surface. Subsequently the cover-tape and the resist transfer pad are lifted off and the photoresist remains on the transducer. An alternative embodiment uses a vacuum, piston laminator to press the loaded resist transfer pad onto the surface of the transducer.
1. A structure for applying photoresist to a surface of a workpiece comprising:
a photoresist transfer pad comprising a transfer layer of polydimethylsiloxane with a transferable coating of photoresist on an outer surface of the transfer layer, and a cushion layer consisting of rubber under the transfer layer, the cushion layer providing flexible support for the transfer layer; and
a cover-tape holding the photoresist transfer pad opposite to the layer of photoresist, the cover-tape being larger in area than the photoresist transfer pad and extending beyond at least first and second edges of the photoresist transfer pad.
2. A structure for applying photoresist to a surface of a workpiece comprising:
a photoresist transfer pad comprising a transfer layer of polydimethylsiloxane with a transferable coating of photoresist on an outer surface of the transfer layer, a cushion layer consisting of rubber under the transfer layer, the cushion layer providing flexible support for the transfer layer, and a stiffener layer attached to the cushion layer and
a cover-tape holding the photoresist transfer pad.
3. A structure for applying photoresist to a surface of a workpiece comprising:
a cover-tape; and
at least two photoresist transfer pads held by the cover-tape, the photoresist transfer pads comprising a polymer layer with a transferable coating of photoresist on an outer surface of the polymer layer, and a cushion layer under the polymer layer opposite the transferable coating of photoresist.
4. The structure of claim 3 wherein the polymer layer consists of polydimethylsiloxane.
5. The structure of claim 3 wherein the photoresist transfer pads further comprise a stiffener layer attached to the cushion layer.
6. The structure of claim 3 wherein the photoresist transfer pads further comprise a stiffener layer attached to the cushion layer, the polymer layer consists of polydimethylsiloxane and the cushion layer consists of silicone rubber.
7. The pad of claim 3 wherein the cushion layer consists of silicone rubber.
8. The structure of claim 3 wherein the cover-tape and photoresist pads are formed into a roll.
9. The structure of claim 8 wherein the photoresist pads are sequentially disposed on the cover-tape so that unrolling the roll sequentially exposes the photoresist pads.