Microwave chemical vapor deposition apparatus and feedback control method
First Claim
1. A microwave plasma CVD apparatus comprising:
- (a) a hermetically sealed vacuum vessel;
(b) raw material gas introducing means for introducing a raw material gas into the vacuum vessel;
(c) evacuating means for evacuating said vacuum vessel; and
(d) microwave introducing means for introducing microwaves through a microwave transmission circuit into said vacuum vessel to generate a plasma within the vacuum vessel;
said microwave transmission circuit including a cavity resonator integrally provided with two matching circuits;
said matching circuits comprising a plunger for varying the length of said cavity resonator and a pair of sliding matching irises.
1 Assignment
0 Petitions
Accused Products
Abstract
A microwave plasma CVD apparatus includes a hermetically sealed vacuum vessel, a device for evacuating the vacuum vessel, and a device for introducing microwaves through a microwave transmission circuit into the vacuum vessel to produce a plasma within the vacuum vessel. The microwave transmission circuit includes a cavity resonator integrally provided with two matching circuits, one of which is a plunger for varying the length of the cavity resonator and the other of which is a pair of sliding matching irises. Feedback in the apparatus can be controlled by driving one of the matching circuits for rough matching of the microwave impedance and driving the other matching circuit for fine matching of the microwave impedance, so that the calculated ratio of the reflected power to the input power, based on a signal from a power monitor, is reduced to a minimum.
-
Citations
6 Claims
-
1. A microwave plasma CVD apparatus comprising:
-
(a) a hermetically sealed vacuum vessel; (b) raw material gas introducing means for introducing a raw material gas into the vacuum vessel; (c) evacuating means for evacuating said vacuum vessel; and (d) microwave introducing means for introducing microwaves through a microwave transmission circuit into said vacuum vessel to generate a plasma within the vacuum vessel;
said microwave transmission circuit including a cavity resonator integrally provided with two matching circuits;
said matching circuits comprising a plunger for varying the length of said cavity resonator and a pair of sliding matching irises. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification