JPH10204642A - Evacuation treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable high throughput while the generation of dusts is prevented by measuring the number of suspending dusts in a sealed chamber, calculating the exhausting speed and sucking speed from the detected number of suspending dusts and controlling the exhausting speed and sucking speed. SOLUTION: A gas in a sealed chamber 1 is exhausted by a pump 4 via an exhaust pipe 2 and a throttle valve 3. A gas is fed to the sealed chamber 1 in an evacuated state from a suction pipe 6 via a flow rate control valve 5. A dust counter 7 always monitors the condition of dusts to be generated in the sealed chamber 1. The detected number of the suspending dusts is fed to a control unit 8, and this control unit 8 controls and adjusts the opening degree of the throttle valve 3 or the flow rate control valve 5 in accordance with the detected number of the suspending dusts. In the case the detected number of the suspending dusts is less than certain value, the throttle valve 3 is continued to be adjusted in the opening direction, so that the exhausting speed is made high in the condition in which the generation of dusts is hard to occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reduced pressure processing apparatus, and more particularly to a reduced pressure processing apparatus such as a dry etching apparatus, a growth apparatus, and a CVD apparatus used in a semiconductor device manufacturing process.

[0002]

2. Description of the Related Art FIG. 4 shows an air supply / exhaust device disclosed in Japanese Patent Application Laid-Open No. 4-284622.
Is connected to a pump 29 through main / sub supply / exhaust valves 23, 24 by two main / sub supply / exhaust pipes 25, 26. At the time of air supply to the closed chamber via 28, the flow control valve and the supply / exhaust valve are controlled by the control device 30 while monitoring the pressure in the closed chamber by the pressure sensor 22.

According to this method, a sub-supply / exhaust valve and a flow rate control valve are opened to supply / exhaust in a pressure range where dust easily occurs, and a sub-supply / exhaust valve and a flow rate in a pressure range where dust is not generated even when high-speed supply / exhaust is performed. The control valve is closed and the main supply / exhaust valve is opened to supply / exhaust air.

Further, JP-A-5-288669 and JP-A-3-226579 disclose methods for monitoring the state of dust generation in a closed chamber or a normal pressure reaction chamber. The former is a method for monitoring the state of dust generation in a closed chamber with higher accuracy, and the latter is a normal pressure CVD device, which monitors particles in exhaust gas sucked into an exhaust pipe connected to a normal pressure reaction chamber, An alarm is issued when the number of particles exceeds the upper limit, and the supply of the reaction gas is stopped.

[0005]

The first problem is that in Japanese Patent Application Laid-Open No. 4-284622, since the actual dust generation state in a closed room is not known, even if dust actually occurs, it can be dealt with. On the other hand, even if dust generation does not occur, throughput is reduced by performing supply and exhaust more slowly than necessary.

The reason is that only the pressure is monitored, and the main and sub-supply / exhaust pipes are selectively used depending on the situation to prevent dust in the closed chamber.

The second problem is disclosed in Japanese Patent Application Laid-Open No. 5-288669.
In the methods disclosed in Japanese Patent Application Laid-Open No. HEI 3-226579 and Japanese Patent Application Laid-Open No. Hei 3-226579, when dust is generated, the former remains damaged by dust generation, and the latter responds to the generation of dust by stopping the reaction gas (interrupting the process). That is, a problem occurs due to the interruption of the process, and the throughput is reduced. The reason is that both have a mechanism for monitoring dust generation, but both suppress the dust generation. This is because there is no mechanism for this.

Accordingly, an object of the present invention is to monitor the dust generation status in a closed room and control the supply / exhaust speed in accordance with the situation, thereby surely suppressing the supply / exhaust speed in a situation in which dust is generated, thereby reducing the dust generation. Minimize damage,
Further, it is an object of the present invention to provide a decompression processing apparatus capable of increasing a processing speed by increasing a supply / exhaust speed in a situation where dust does not occur, thereby obtaining a high throughput while reliably preventing dust generation.

[0009]

SUMMARY OF THE INVENTION The present invention is characterized in that a closed chamber, an exhaust pipe and an air supply pipe connected to the closed chamber,
A detector for measuring the number of airborne dust in the closed chamber, calculating a discharge speed and an air supply speed from the number of airborne dust detected by the detector, and controlling the exhaust speed and the air supply speed. Pressure reduction processing apparatus.

More specifically, the decompression processing apparatus according to the present invention comprises an exhaust pipe / intake pipe connected to a closed chamber, a throttle valve provided in the exhaust pipe, a pump connected to the exhaust pipe to perform exhaust, and an air supply pipe. A gas flow control valve for air supply, a dust counter for monitoring the state of dust generation in a closed chamber, and a control device for receiving signals of the number of detected suspended dust from the dust counter and controlling the functions of the throttle valve and the flow control valve. And a mechanism for monitoring the generation of dust due to the air flow at the time of air supply and exhaust, and adjusting a throttle valve or a flow control valve according to the amount of dust.

Another feature of the present invention is that it has a closed chamber having a movable part therein, and a detector for measuring the number of floating dust in the closed chamber. The pressure reduction processing apparatus includes a control device that calculates an operation speed of a movable part and controls the operation speed. Alternatively, another feature of the present invention is a closed chamber having a movable part therein,
An exhaust pipe and an air supply pipe connected to the closed chamber, and a detector for measuring the number of floating dust in the closed chamber, the exhaust speed and the air supply speed from the number of floating dust detected by the detector The present invention resides in a decompression processing device having a control device that calculates an operation speed of the movable part and controls each speed.

As described above, according to the present invention, there is provided a mechanism for monitoring the state of dust generation in the sealed room and controlling the supply / exhaust speed based on the situation. Thus, dust generation can be reliably prevented. On the other hand, when dust generation is unlikely to occur, the supply / exhaust speed can be increased, and the processing time can be increased.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a decompression processing apparatus according to a first embodiment of the present invention. In this device, the closed chamber 1
The gas inside is exhausted by the pump 4 through the exhaust pipe 2 and the throttle valve 3, and the gas is supplied from the intake pipe 6 through the flow control valve 5 when the gas is supplied into the closed chamber 1 in a reduced pressure state.

The state of dust generation in the closed chamber 1 is constantly monitored by a dust counter 7, and the number of floating dust detected by the dust counter 7 is sent to a control device 8. An appropriate opening of the throttle valve 3 or the flow control valve 5 is calculated, thereby controlling and adjusting the opening.

In the apparatus having the above-described configuration, when dust is generated due to an air current in the closed chamber 1 at the time of evacuation, when the number of floating dust detected by the dust counter 7 exceeds a certain value, this number is reduced. The controller 8 adjusts the slot valve 3 in the closing direction so as to be equal to or less than a certain value, thereby reducing the air flow velocity in the closed chamber 1 and suppressing dust generation.

If the number of detections of floating dust due to dust generation is less than a certain value, the throttle valve 3 is continuously adjusted in the opening direction by the control device 8, so that the exhaust speed should be increased in a situation where dust generation hardly occurs. Can be.

The same control is performed for the air supply. If the number of floating dust is equal to or more than a certain value, the flow control valve is adjusted in the closing direction. Continue to be.

FIG. 2 is a graph illustrating changes over time in the pressure in the closed chamber and the degree of opening of the throttle valve when the closed chamber is evacuated in the decompression processing apparatus of the present invention.

In general, dust is likely to occur in a high pressure region, and is less likely to occur in a low pressure region. Therefore, the throttle valve opening is small in a high pressure region and is large in a low pressure region. , Finally fully open.

Next, a second embodiment of the present invention will be described with reference to FIG.

The decompression processing apparatus according to the second embodiment comprises:
For example, the present invention can be applied to a semiconductor device manufacturing apparatus.
More specifically, the present invention can be applied to a dry etching apparatus or a growth apparatus.

The closed chamber of the decompression processing apparatus shown in FIG. 3 has a first closed chamber 11 for accommodating a carrier containing a semiconductor device, and a second sealed chamber having a processing stage 17 on which the semiconductor device is processed. The first closed chamber 11 and the second
A handler 18 for transferring a semiconductor device to and from the closed chamber 12 is provided as one of movable parts in the closed chamber,
A door 16 which is formed in a partition between the closed chamber 11 and the second closed chamber 12 and opens and closes an opening connected to both the chambers is provided as another movable part in the closed chamber.

Further, the first and second closed chambers 11, 12
First and second dust counters 13 and 14 for monitoring the dust generation status at
Further, a control device 19 is provided for controlling the movement of the handler 18 and the door 16 in response to signals from these dust counters and controlling valves of a supply / exhaust system (not shown in FIG. 3) as shown in FIG. It is composed.

In this apparatus, the first dust counter 1
The semiconductor device is transported and processed while constantly monitoring the state of dust generation in the first closed chamber 11 and the second closed chamber 12 by the third dust counter 14 and the second dust counter 14.

The control device 19, which has received the signal from the dust counter, sets the handler 1 according to the dust generation condition in the closed room.
The appropriate operating speed of the door 8 and the door 16 is calculated, thereby controlling and adjusting these speeds.

With this mechanism, the operation speed of the movable portion is reduced in a situation where dust is likely to occur, thereby suppressing generation of dust. In a situation where dust is unlikely to occur, the movement of the movable portion is made smooth. As a result, the processing time can be reduced.

[0028]

As described above, the first effect of the present invention is that the adverse effect of dust generation can be minimized.

The reason is that the dust generation state in the sealed room is constantly monitored, so that the generation of dust can be reliably suppressed by adjusting the air supply / exhaust speed or the operation speed of the movable part in the case where dust easily occurs. is there.

The second effect is that processing time can be prevented from being wasted due to unnecessary lowering of the supply / exhaust speed or the operation speed of the movable part.

The reason is that if dust is not generated in the closed chamber, a mechanism is provided to increase the supply / exhaust speed or the operation speed of the movable part correspondingly.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a decompression processing apparatus according to a first embodiment of the present invention.

FIG. 2 shows a decompression processing apparatus according to an embodiment of the present invention.
It is the figure which illustrated change with time of the pressure of a closed chamber, and the opening degree of a throttle valve at the time of performing a closed chamber exhaust.

FIG. 3 is a diagram illustrating a configuration of a decompression processing apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional decompression processing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed chamber 2 Exhaust pipe 3 Throttle valve 4 Pump 5 Flow control valve 6 Air supply pipe 7 Dust counter 8 Control device 11 1st closed chamber 12 2nd closed chamber 13 1st dust counter 14 2nd dust counter 15 Carrier Reference Signs List 16 Door 17 Processing stage 18 Handler 19 Controller 21 Sealed chamber 22 Pressure sensor 23 Main supply / exhaust valve 24 Secondary supply / exhaust valve 25 Main exhaust pipe 26 Secondary supply / exhaust pipe 27 Flow control pipe 28 Flow control valve 29 Pump 30 Controller

Claims (3)

[Claims] A closed chamber, an exhaust pipe and an air supply pipe connected to the closed chamber, and a detector for measuring the number of floating dust in the closed chamber, wherein the floating dust detected by the detector is provided. A decompression processing device comprising a control device that calculates an exhaust speed and an air supply speed from a number and controls the exhaust speed and the air supply speed. 2. A closed chamber having a movable part therein, and a detector for measuring the number of floating dust in the closed chamber, and the operating speed of the movable part is determined from the number of floating dust measured by the detector. A decompression processing device comprising a control device for calculating and controlling the operation speed. 3. A closed chamber having a movable portion therein, an exhaust pipe and an air supply pipe connected to the closed chamber, and a detector for counting the number of floating dust in the closed chamber. A decompression processing device comprising: a controller that calculates an exhaust speed, an air supply speed, and an operation speed of the movable portion from the number of suspended dust detected by the control device and controls the respective speeds.