Multilayer, cushioned liquid drop detector

A liquid drop detector comprising:

• a case body attached on one side surface of a transparent substrate;
• a light emitter which emits a light;
• a light receiver which receives the light;
• a light guide which guides the light emitted from said light emitter into said transparent substrate wherein the light undergoes total internal reflection, the light guide further guides the light undergoing total internal reflection within said transparent substrate to said light receiver, wherein said light emitter, light receiver and said light guide are provided inside said case body;
• wherein said light guide is constructed with a plurality of light guiding bodies piled up in a direction of the thickness of said detector, and non-volatile liquid lies between any among said plurality of light guiding bodies or between said light guiding body and said transparent substrate.

A liquid drop detector attached on a first side surface of a transparent substrate to detect plural liquid drops present upon a second, opposite side surface thereof, comprising:

• a case body attached on the first side surface of the transparent substrate;
• a light emitting device which emits a light;
• a light receiver which receives the light;
• a light guide constructed and arranged to guide the light into the transparent substrate, and to guide the light from the transparent substrate to the light receiver,
• the light receiver, the light guide and the light emitting device each being disposed within the case body,
• wherein said light guide comprises a light guiding body constructed and arranged to guide light from the light emitting device into the transparent substrate, the light guiding body widening, as the light proceeds downstream, the widening occurring in a dimension perpendicular to the propagation of the light and parallel to the transparent substrate.

A liquid drop detector attached on a first side surface of a transparent substrate to detect plural liquid drops present upon a second, opposite side surface thereof, comprising:

• a case body attached on the first side surface of the transparent substrate;
• a light emitting device which emits a light;
• a light receiver which receives the light;
• a light guide constructed and arranged to guide the light into the transparent substrate, and to guide the light from the transparent substrate to the light receiver,
• the light receiver, the light guide and the light emitting device each being disposed within the case body,
• wherein said light guide comprises a light guiding body constructed and arranged to guide light from the transparent substrate into the light receiver, the light guiding body narrowing, as the light proceeds downstream, the narrowing occurring in a direction perpendicular to the propagation of the light and parallel to the transparent substrate.