摘要:
A micro wave plasma processing device, wherein a tapered surface for relieving a variation in impedance and a member having an intermediate dielectric constant are installed between a micro wave feeding wave guide and a micro wave antenna, whereby the formation of reflected wave at the connection part between the micro wave feeding wave guide and the micro wave antenna can be suppressed to increase a power feeding efficiency and suppress discharge so as to stabilize the formation of plasma in the plasma processing device.
摘要:
A versatile flow rate controller comprises an orifice (8) exchangeable depending on the required opening for a different fluid and a different flow rate range, a control valve (2) on the upstream side, a pressure detector (6) between the control valve (2) and the orifice (8), an arithmetic circuit (14) for calculating a flow rate as Qc=KP1 (K is a constant) from an upstream pressure P1 detected by the detector (6); an output circuit (16) for providing a flow-setting signal Qe, a converter circuit (18) for producing a flow rate signal Qf (Qf=kQc) by multiplying the calculated flow rate signal Qc by a factor k to change the full-scale flow rate, and a control circuit (20) for supplying a driver section (4) of the control valve (2) with a control signal Qy corresponding to the difference between the Qf and Qe.
摘要:
A gas supply equipment comprising a gas control valve (2), an orifice accommodating valve (9) provided downstream of the control valve (2), a pressure detector (3) provided between the control valve (2) and the orifice accommodating valve (9), an orifice (5) provided downstream of the valve mechanism of the orifice accommodating (9) and an arithmetic and control unit which calculates a flow rate as Qc = KP1 (K; constant) from a detected pressure P1 by the pressure detector (3) and outputs to the drive unit of the control valve (2) the difference between a flow rate instruction signal Qs and a calculated flow rate Qc as a control signal Qy.
摘要:
In a microwave plasma processing apparatus, a shower plate or plasma transmission window facing a substrate to be processed is formed to have a concaved surface at a side facing the substrate to be processes for compensating for a decrease of plasma density in the peripheral region of the substrate to be processed. As a result, stable and uniform plasma is maintained in the vicinity of the surface of the substrate to be processed even in the case a low pressure plasma process such as etching is conducted. Further, such a construction facilitates plasma ignition.
摘要:
A construction for mounting a pressure detector prevents the detector diaphragm from being strained by stress applied to the pressure detector as the detector is mounted in a fixture main body provided in a pipe line or the like, thereby keeping the output characteristics and temperature characteristics of the detector from greatly differing before and after the mounting. The pressure detector is constructed by combining and fastening together a diaphragm base having a diaphragm and a sensor base having a sensor element therein that is activated by displacement of the diaphragm base. The pressure detector, with a gasket placed thereunder, is disposed in a mounting hole of a fixture main body that is mounted in a pipe line. The pressure detector is airtightly pressed and fastened by a presser member inserted from above in the mounting hole. The presser member is brought in contact with a block upper surface of the diaphragm base, and the gasket is also brought in contact with the block lower surface of the diaphragm base. A shallow groove is defined in the form of a ring on the lower surface of the block at a place inward of the portion contacting the metal gasket so that the shallow groove absorbs strain caused by the presser member.
摘要:
A fluid-switchable flow rate control system that permits free changing of the full scale flow rate and which can control a plurality of kinds of fluids with high precision. The fluid-switchable flow rate control system controls the flow rate of fluid with the pressure P 1 on the upstream side of the orifice member held about twice or more higher than the downstream pressure P 2 , the fluid-switchable flow rate control system comprising an orifice member 8 replaceable with another to provide a suitable orifice diameter according to the kind of fluid and the flow rate range, a control valve 2 provided on the upstream side thereof, a pressure detector 6 provided between the control valve 2 and the orifice member 8, and a flow rate calculation circuit 14 where, from the pressure P 1 detected by the pressure detector, the flow rate Qc is calculated by the equation Qc = KP 1 (K: constant), a flow rate-setting circuit 16 for outputting flow rate setting signal Qe, a flow rate conversion circuit 18 for multiplying the calculated flow rate signal Qc by the flow rate conversion rate k into switch-over calculated flow rate signal Qf ( Qf = kQc ) to change the full scale flow rate, and a calculation control circuit 20 to output the difference between the switch-over calculation flow rate signal Qf and the flow rate setting signal Qe as control signal Qy to the drive 4 of the control valve 2, thereby opening or closing the control valve to bring the control signal Qy to zero, thus controlling the flow rate on the downstream side of the orifice member.
摘要:
A substrate processing apparatus has a processing space provided with a holding stand for holding a substrate to be processed. A hydrogen catalyzing member is arranged in the processing space to face the substrate and for decomposing hydrogen molecules into hydrogen radicals H*. A gas feeding port is arranged in the processing space on an opposite side of the hydrogen catalyzing member to the substrate for feeding a processing gas including at least hydrogen gas. An interval between the hydrogen catalyzing member and the substrate on the holding stand is set less than the distance that the hydrogen radicals H* can reach.
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 P1 upstream of the orifice and the flow rate over a wide range of pressure ratio P2/P1 (where P1 is the pressure upstream of the orifice and P2 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:
A high precision flow rate control of a clustering fluid such as the HF gas and the like to be supplied to a vacuum chamber and the like is made possible in the flow rate range of 3∼300SCCM using a pressure type flow rate control device. Specifically, disclosed herein is a method of controlling the flow rate of the clustering fluid using a pressure type flow rate control device in which the flow rate Q of the gas passing through an orifice is computed as K=KP 1 (where K is a constant) with the gas being in a state where the ratio P 2 /P 1 between the gas pressure P 1 on the upstream side of the orifice and the gas pressure P 2 on the downstream side of the orifice is held at a value not higher than the critical pressure ratio of the gas wherein the association of molecules is dissociated either by heating the afore-mentioned pressure type flow rate control device to the temperature higher than 40°C, or by applying the diluting gas to the clustering fluid to make it lower than a partial pressure so that the clustering fluid is permitted to pass through the afore-mentioned orifice in a monomolecular state.