Property testing apparatus for photocurable resin, retainer used in the testing apparatus and property testing method

A method of testing a property of a photocurable resin by measuring a force generated between the photocurable resin and a pressing member, the method comprising:

• dripping the photocurable resin on a substrate;
• pressing the dripped photocurable resin with a pressing member that has light transmission characteristics;
• irradiating light emitted from an external light source onto the photocurable resin through the pressing member in a state of being not contacting a light source and an light transmission line including an optical fiber, the light emitted from the external light source being introduced through a light introduction window and being guided by a reflection mirror towards the photocurable resin through the pressing member;
• and
• detecting a force generated between the pressing member and the photocurable resin.

A retainer for use in measuring a force generated between a photocurable resin and a pressing member by a detector, comprising:

• a pressing member that has light transmission characteristics and is pressed to the photocurable resin;
• and
• a light irradiation block that is provided between the detector and the pressing member and irradiates light emitted from an optical fiber onto the pressing member;
• wherein
• the light irradiation block includes an introduction space into which the optical fiber is inserted from a direction perpendicular to an axis of the retainer in a non-contact state, the optical fiber being set so that a light emitting end of the optical fiber is set in a direction perpendicular to the photocurable resin.