摘要:
A method for detecting abnormal flow rate by easily detecting an obstruction of an orifice while a fluid pressure flow rate controller using an orifice is controlling the flow rate. The method uses a flow rate controller (FCS) so as to calculate the flow rate Qc on the downstream side when the upstream-side pressure P1 is maintained at a value about twice or more the downstream-side pressure P2 from Qc=KP1 (K: constant) and to control the operation of a control valve (CV) according to a signal Qy representing the difference between the calculated flow rate Qc and a preset flow rate Qs. A testing circuit or flow rate setting circuit provided separately outputs a testing signal ΔQs having a testing amplitude V0 to the control valve (CV). The pressure amplitude V of a pressure variation ΔP1 of the upstream-side pressure P1 occurring in response to the opening/closing of the control valve (CV) is measured. When the pressure amplitude V decreases below a limit amplitude Vt, the obstruction of the orifice is announced, thus implementing the method. If the testing signal ΔQs is superimposed on a steady-state preset flow rate signal Qs0 and outputted together from the testing circuit or the flow rate setting circuit to the control valve (CV), an abnormal flow rate can be detected while controlling the flow rate by using the steady-state preset flow rate signal Qs0.
摘要:
The present invention has an object of improving the cooling efficiency of the process gas supply part of a plasma processor and thereby suppressing an increase in the temperature of the process gas supply part. Therefore, used in the present invention is a plasma processor having a processing vessel having a holder holding a substrate to be processed, a microwave antenna provided on the processing vessel so as to oppose the substrate to be processed, and a processing gas supply part provided between the substrate to be processed on the holder and the microwave antenna so as to oppose the substrate to be processed, characterized in that the process gas supply part has multiple first openings through which plasma formed in the processing vessel passes, a process gas channel connectable to a process gas source, multiple second openings communicating with the process gas channel, and a cooling medium channel through which a cooling medium cooling the process gas supply part flows, wherein the cooling medium includes mist.
摘要:
A micro wave plasma processing device using a radial line slot antenna, wherein a slot plate (16) is formed with a material having a coefficient of thermal expansion near the coefficient of thermal expansion of a slow-wave plate (18) or by depositing a metal on a dielectric plate forming the slow-wave plate (18), and an adhesion between the slow-wave plate and the slot plate forming a micro wave radiation surface in the antenna is increased to prevent an abnormal discharge.
摘要:
A microwave plasma processing apparatus is disclosed that enables fast and easy plasma ignition at the pressure for plasma processing. In the microwave plasma processing apparatus, a plasma ignition facilitating unit is provided to facilitate plasma ignition induced by a microwave. The plasma ignition facilitating unit includes a deuterium lamp that emits vacuum ultraviolet rays, and a transmission window that allows the vacuum ultraviolet rays to penetrate and irradiate a plasma excitation space. The transmission window is a convex lens, and focuses the vacuum ultraviolet rays to enhance ionization of the plasma excitation gas. With such a configuration, it is possible to induce plasma ignition easily and quickly.
摘要:
In a microwave plasma processing apparatus that uses a radial line slot antenna, abnormal discharges are suppressed and the excitation efficiency of microwave plasma is improved simultaneously. In the joint between the radial line slot antenna and the coaxial waveguide, the point part of the power supplying line of the coaxial waveguide is separated from the slot plate constructing a radiation face.
摘要:
A method checks the flow rate for abnormalities while controlling the flow rate of fluid in a pressure-type flow controller FCS using an orifice - the pressure-type flow controller wherein with the upstream pressure P 1 maintained about two or more times higher than the downstream pressure P 2 , the downstream flow rate Q C is calculated by the equation Q C = KP 1 (K: constant) and wherein the control valve CV is controlled on the basis of the difference signal Q Y between the calculated flow rate Q C and the set flow rate Q S . The method comprises, outputting a testing signal ΔQs having a testing amplitude Vo from a testing circuit provided separately or a flow rate setting circuit to the control valve CV, measuring the pressure amplitude V of the variable pressure ΔP1 of the pressure P1 on the upstream side of the orifice that arises in response to actuation of the control valve CV and setting off an alarm for the clogging of the orifice when the pressure amplitude V is smaller than a limit amplitude Vt. If the testing signal ΔQs is superimposed on a steady-state set flow rate signal Qso and outputted to control the valve CV from the testing circuit or the flow rate setting circuit, the flow rate can be checked for abnormalities while controlling the flow rate by the steady-state set flow rate signal Qso.
摘要:
An orifice for use in pressure type flow rate control unit which can be manufactured easily and inexpensively, and which has a linear relationship between pressure P 1 upstream of the orifice and the flow rate over a wide range of pressure ratio P 2 /P 1 (where P 1 is the pressure upstream of the orifice and P 2 is the pressure downstream of same), with the flow rate characteristic relationship among a plurality of orifices being easily adjustable. More specifically, the orifice has a structure comprising a tapered inlet section (1) wherein one open end of a bottom hole (6) bored into a main body member (D) is cut into a shape like the mouthpiece of a trumpet, and a short drawn parallel part (2) continuing therefrom; and a short expanded tapered section (3) formed by expanding the diameter of the other open end of the bottom hole (6) and continuing from the drawn parallel part (2), and an expanded parallel part (4) continuing therefrom.
摘要:
With the present invention, water adhered to a substrate during cleaning process is completely removed and the water-free substrate is conveyed to a film-forming apparatus. A substrate processing system (1) comprises a cleaning apparatus (3) for cleaning a substrate with a cleaning liquid, a water removing apparatus (4) for removing water adhering to the substrate which has been cleaned by the cleaning apparatus (3), and a conveyance portion (7) for carrying the substrate, from which water has been removed by the water removing apparatus (4), through a drying atmosphere to another processing apparatus.
摘要:
A microwave plasma process device (10) is provided with a plasma ignition enhancing means for enhancing plasma ignition by microwaves. The plasma ignition enhancing means comprises a deuterium lamp (30) which generates vacuum ultraviolet rays, and a penetration window (32) guiding the vacuum ultraviolet rays, which have penetrated the same, to a plasma excitation space (26). The penetration window (32) is constructed as a convex lens, focusing the vacuum ultraviolet rays to enhance the ionization of the plasma excitation gas. Such arrangement makes it possible to effect plasma ignition easily and rapidly.