Method and apparatus for degassing coating liquid

1. A method of degassing a coating liquid, comprising the step of:

irradiating the coating liquid with a plurality of ultrasonic waves of different frequency bands simultaneously to degass said coating liquid;

wherein said coating liquid is free from a gas-liquid interface and is pressurized to at least 10 kPa.

2. The method of degassing a coating liquid according to claim 1 , wherein said coating liquid is any of a photosensitive material coating liquid, a heat development photosensitive material coating liquid, a transparent heat-sensitive material coating liquid, and an organic solvent coating liquid.

3. A coating liquid degassing apparatus, comprising:

a tubular member having, at one end, a port through which a coating liquid flows in and, at the other end, a port through which the coating liquid flows out, and

a plurality of ultrasonic vibrators secured to an outer periphery of the tubular member,

wherein the tubular member can be internally simultaneously irradiated with a plurality of ultrasonic waves of different frequency bands;

a first ultrasonic vibrator is located across from a second ultrasonic vibrator, and

the first ultrasonic vibrator emits ultrasonic waves with a different frequency band than the second ultrasonic vibrator.

4. The coating liquid degassing apparatus according to claim 3 , wherein the tubular member has a polygonal shape in a cross-section.

5. The coating liquid degassing apparatus according to claim 3 , wherein

each of a plurality of second ultrasonic vibrators is located across from a first ultrasonic vibrator, and

the first ultrasonic vibrators emit ultrasonic waves with a different frequency band than the second ultrasonic vibrators.

6. A method of degassing a coating liquid, comprising the steps of:

irradiating the coating liquid with a plurality of ultrasonic waves of different frequency bands simultaneously to degass said coating liquid;

emitting ultrasonic waves with a first frequency band from a first ultrasonic vibrator, and

emitting ultrasonic waves with a second frequency band from a second ultrasonic vibrator;

wherein the first ultrasonic vibrator is secured to an outer periphery of a tubular member, and

the second ultrasonic vibrator is secured to the outer periphery of the tubular member across from the first ultrasonic vibrator.

7. The method of degassing a coating liquid according to claim 6 , further comprising:

emitting ultrasonic waves with a first frequency band from a plurality of first ultrasonic vibrators, and

emitting ultrasonic waves with a second frequency band from a plurality of second ultrasonic vibrators;

wherein the plurality of first ultrasonic vibrators are secured to an outer periphery of a tubular member,

the plurality of second ultrasonic vibrators are secured to the outer periphery of the tubular member, and

each second ultrasonic vibrator is located across from a first ultrasonic vibrator.