Rayzist Photomask Inc.

Randy S Willis

Raymond L Zukowski

Roger B Souders

A photoresist laminate includes a substrate (such as PET film having a thickness of between about 0.002-0.003 inches) with first and second faces, a first film layer, and a second layer. The first film layer is a photoresist material (radiation sensitive) which is soluble or dispersible in water but which will harden upon sufficient exposure to radiation so as to become substantially insoluble or non-dispersible. The first film layer may be of any conventional photoresist material (e.g. having a thickness of about 0.002-0.009 inches) and is operatively disposed on the substrate first face (either directly contacting it or connected to a membrane support layer which in turn is directly connected to the substrate first face). The second layer is of a material and thickness so that it substantially prevents sticking of the first film layer to other surfaces, while not significantly interfering with the radiation sensitivity thereof. The second layer is on the opposite side of the first film layer from the substrate, and may comprise a mixture of polyvinyl alcohol solution and polyvinyl acetate emulsion, having a thickness of less than 0.0005 inches (e.g. about 0.0001-0.0002 inches). The laminate is used in a method of making a stencil for abrading or etching by exposing the laminate to radiation, processing a laminate by spraying water on the laminate to remove the soluble or dispersible portion, and then using the stencil so formed as a mask on the surface of an object to etch or abrade the surface.

Non-stick photoresist laminate

Photomasks used for sandblasting and sandcarving may be readily produced by the user of the photomask in a simple and relatively inexpensive manner. The user places a stencil and print positive in a manual clamping structure --between a pivoted glass cover and foam covered base and exposes them to about 60-90 seconds of ultraviolet light from a 500 watt bulb. After removing the print positive, the stencil is then placed on a support surface above a tank, and reciprocating spray heads direct 100 psi, 90 degrees F. water onto the stencil to remove uncured emulsion. A combination pump/heater within the tank recirculates tank water to the spray heads. The stencil is then hand blotted, e.g. using a lamb's wool roller, and then dried in a microwave oven at low power for about eight minutes. Then it is placed on newspaper, and hat activated liquid adhesive is placed in a pool at one end of it and manually drawn over it with a draw bar, to produce the final photomask.

Use site production of sandblasting photomasks

Uncured emulsion is effectively washed from a stencil in the production of photomasks by mounting a drum rotatable about a horizontal axis within a portable cabinet. The drum is driven by a small (e.g. variable speed 1/16 HP) electric motor and spins at about 50-100 rpm. Water is sprayed onto the stencil mounted on the drum at about 80 psi by 4-10 V-jet nozzles. Liquid running off the stencil is collected by a catch basin mounted just below the drum, and passes through a drain pipe with strainer into a heat insulated holding tank with an electric resistance heating element, and is recirculated from the tank to the spray nozzles-by a high pressure pump. The pump and motor are controlled by a timer, and after completion of the washing cycle the stencil is removed from the cabinet.

Removing uncured emulsion from stencils during photomask production

A cremation urn has a front wall with human readable indicia (such as the name of a deceased human or pet) formed integrally with the front wall, the front wall actually being a component of the urn. The indicia may be relief indicia, as formed by sand blasting decorative stone such as granite or marble, or raised indicia, such as formed with a bronze casting. Side walls with grooves for receiving the front wall side edges, and edges of a common top, rear, and partial bottom piece of malleable material (e.g. brass), are held together with a number of bolts and cooperating T-nuts, with the bolt holes covered with plugs, or by hooks and turnbuckles. The bottom includes a removable plate, which allows access to the interior volume so that ashes in a bag may be readily inserted into, and removed from, the container.

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Vista, CA, United States of America

Randy S Willis