Patent ID: 9333529
Filing Date: 2016-05-10
CPC Classification: B05C,B05D

Claim Text:
1. An apparatus for producing a particle film by sweeping a meniscus area in a particle dispersion liquid filling a space between a first substrate and a second substrate facing the first substrate and by forming the particle film on the first substrate while evaporating a solvent in the meniscus area, the apparatus comprising: particle concentration measuring capacitance meter for measuring a concentration of particles in the meniscus area, wherein the particle concentration measuring capacitance meter includes a sensor probe that is used to measure capacitance in the meniscus area in a noncontact manner and determine particle concentration from the capacitance; a device configured to adjust the concentration of particles in the meniscus area by applying a direct-current electric field between the first substrate and the second substrate in accordance with the particle concentration measured with the particle concentration measuring capacitance meter, wherein the device adjusts the concentration of particles in the meniscus area by controlling a speed at which the first substrate changes from one position to another, wherein the following formula is utilized to determine coverage of the particles in the meniscus area: (c=k×ψ/(v(1−ψ)), where c is the coverage, k is a constant, Ψ is the concentration of particles in the dispersion liquid (% by volume), and v is the speed at which the first substrate moves (μm/s), and a capacitive displacement meter provided with a sensor probe for measuring a degree of bending of the first substrate from a value of capacitance formed between the sensor probe and the first substrate, wherein the particle concentration measuring capacitance meter determines the particle concentration in accordance with the degree of bending measured by the capacitive displacement meter provided with a sensor probe, in addition to the capacitance in the meniscus area.