Fastener system for supporting a liner plate in a gas showerhead reactor
First Claim
1. A fastener for joining two members of a gas showerhead reactor comprising:
- first and second planar members of a gas nozzle array associated with a showerhead of a gas reactor, wherein nozzles in each planar member are aligned for gas passage from one side of the joined members to the opposite side; and
a hollow fastener fitting into the first and second members, each fastener having a tubular shank extending completely through said one of the first and second members and having a head for stopping passage of the shank beyond a distance in said one of the first and second members with a foot extending from the shank opposite the head at a distance extending partially into the other of the first and second members through a keyway, the tubular shank and foot surrounding a hollow central region forming a nozzle extending completely through said one of the first and second members and partially through the other of the first and second member to a nozzle of the other of the first and second members, the other member having an arcuate concourse communicating with the keyway, whereby the foot may be turned in the concourse, locking the second member to the first member in a bayonet tip manner.
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Accused Products
Abstract
A fastener system and method for supporting and retaining modular insulating quartz liners with gas apertures in close proximity to corresponding apertures in diffusers of gas showerheads. Tubular fasteners have a head, a tubular shank and a foot that extend through a liner plate nozzle into a diffuser plate. A keyway in the gas diffuser, aligned and coaxial with a diffuser nozzle, allows the foot to reach an arcuate concourse through a keyway where it can be locked by bayonet turning. The keyway is machined into the diffuser by EDM and is an inversion of the fastener tip geometry rotated about the axis of the tubular shank. Each fastener and nozzle set form a coaxial path for distributing processing gas to substrates through liner and diffuser plates from a plenum in showerheads of a MOCVD reactor.
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Citations
15 Claims
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1. A fastener for joining two members of a gas showerhead reactor comprising:
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first and second planar members of a gas nozzle array associated with a showerhead of a gas reactor, wherein nozzles in each planar member are aligned for gas passage from one side of the joined members to the opposite side; and a hollow fastener fitting into the first and second members, each fastener having a tubular shank extending completely through said one of the first and second members and having a head for stopping passage of the shank beyond a distance in said one of the first and second members with a foot extending from the shank opposite the head at a distance extending partially into the other of the first and second members through a keyway, the tubular shank and foot surrounding a hollow central region forming a nozzle extending completely through said one of the first and second members and partially through the other of the first and second member to a nozzle of the other of the first and second members, the other member having an arcuate concourse communicating with the keyway, whereby the foot may be turned in the concourse, locking the second member to the first member in a bayonet tip manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A fastener system for joining gas nozzle arrays of a gas diffuser plate and a liner plate in a MOCVD showerhead comprising:
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a liner plate having opposed major surfaces with liner nozzles extending from a first major surface to a second major surface; a diffuser plate for dispensing gas from a showerhead having a region parallel to a region of the liner plate where the liner plate and diffuser plates are to be joined together, the diffuser plate having diffuser nozzles corresponding in location to liner nozzles, the diffuser plate having axial keyways in the parallel region aligned with diffuser nozzles, each keyway terminating in an arcuate concourse; and fasteners forming at least some of the liner nozzles and forming diffuser nozzles extending partially into the diffuser plate from the liner nozzles of the fasteners to diffuser nozzles outside of the fasteners, each fastener having a tubular shank with opposed first and second ends fitting through the liner plate and allowing gas passage therethrough, with the shank having a head at one end and a foot extending radially outwardly near the opposite end, the shank having sufficient length to pass through the liner plate with the radially extending foot passing along the keyway to the arcuate concourse of the diffuser plate, whereupon turning of the head turns the foot in the concourse in a bayonet tip manner joining the liner plate and the diffuser plate. - View Dependent Claims (12, 13, 14, 15)
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Specification