Systems and Methods for Monitoring and Controlling Dispense Using a Digital Optical Sensor
First Claim
Patent Images
1. A device for detection of a semiconductor process liquid, the device comprising:
- a light source adapted to generate a light beam;
a digital optical sensor to detect the light beam; and
a nozzle adapted to support the semiconductor process liquid and transmit the light beam, the nozzle and the source arranged to refract the beam in a first direction while the beam passes through a gas disposed in the nozzle and to refract the beam in a second direction while the beam passes through the liquid.
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Abstract
A device for detection of a semiconductor process liquid is provided. The device includes a light source adapted to generate a light beam and a digital optical sensor to detect the light beam. A nozzle is adapted to support the semiconductor process liquid and transmit the light beam. The nozzle and the source are arranged to refract the beam in a first direction while the beam passes through a gas disposed in the nozzle. The nozzle and source are arranged to refract the beam in a second direction while the beam passes through the liquid.
16 Citations
21 Claims
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1. A device for detection of a semiconductor process liquid, the device comprising:
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a light source adapted to generate a light beam;
a digital optical sensor to detect the light beam; and
a nozzle adapted to support the semiconductor process liquid and transmit the light beam, the nozzle and the source arranged to refract the beam in a first direction while the beam passes through a gas disposed in the nozzle and to refract the beam in a second direction while the beam passes through the liquid. - View Dependent Claims (2, 3, 4, 5)
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6. A device for detecting delivery errors with a semiconductor process liquid, the device comprising:
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a nozzle to deliver the liquid, the nozzle comprising a tip;
a flow valve coupled to the nozzle to dispense the liquid through the nozzle;
a suck back valve to suck the liquid back from the nozzle tip;
a digital optical sensor to detect the liquid or a gas in the nozzle, the sensor adapted to generate a first signal while liquid is disposed in the nozzle and a second signal while a gas is disposed in the nozzle;
a processor coupled to the sensor, the processor adapted to generate an error signal in response to the second signal from the sensor while the flow valve dispenses liquid through the nozzle and/or in response to the first signal from the sensor while the suck back valve has sucked the liquid back from the tip. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of applying a semiconductor process liquid through a nozzle, the method comprising:
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opening a flow valve to dispense the liquid through the nozzle;
closing the flow valve to stop the liquid in the nozzle at a first level, the first level near a tip of the nozzle;
drawing the liquid back from the first level toward a second level away from the tip with a suck back valve while the flow valve remains closed; and
advancing the liquid from the second level to the first level with the suck back valve to reset liquid at the first level. - View Dependent Claims (15, 16, 17)
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18. A device for dispensing a semiconductor process liquid, the device comprising:
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a light source to generate a light beam;
a digital optical sensor to detect the light beam;
a nozzle having a channel formed therein to dispense the liquid, the nozzle adapted to support the semiconductor process liquid and transmit the light beam, the nozzle and source arranged to refract the light beam in a first direction while a gas is disposed in the channel near the tip of the nozzle, the nozzle and source arranged to refract the light beam in a second direction while the liquid is disposed in the channel near a tip of the nozzle;
a flow valve to control a flow of the liquid through the nozzle, the flow valve open to dispense liquid through the nozzle and closed to stop the liquid in the nozzle near the tip;
a suck back valve adapted to suck the liquid back from the nozzle tip; and
a processor connected to the digital sensor, the flow valve and the suck back valve, the processor adapted to sequentially close the flow valve to stop the liquid for a period of time and open the suck back valve after the period of time while the flow valve remains closed, the processor adapted to generate an error signal in response to the beam refracted in the first direction in the time period and the gas detected with the sensor. - View Dependent Claims (19, 20, 21)
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Specification