Optical device, lens-barrel, image pickup apparatus and electronic apparatus

A lens-barrel, comprising:

• a barrel;
• and
• an optical device held on the barrel, the optical device including:
• a transparent substrate, and
• a multi-layer film including:
• a multi-layer dielectric structure formed on a surface of the transparent substrate and being formed of at least three dielectric layers, a first layer of the at least three dielectric layers contacting the transparent substrate, a second layer of the dielectric layers contacting the first layer and having a higher refractive index, a third layer of the dielectric layers contacting the second layer and having a lower refractive index, the first layer of the dielectric layers having a refractive index that is intermediate to the higher refractive index and the lower refractive index, and
• a transparent conductive thin film having a predetermined thickness formed atop an outermost one of the at least three dielectric layers of the multi-layer dielectric structure.

An image pickup apparatus, comprising:

• an optical device disposed in an optical path;
• and
• an image pickup device disposed in the optical path;
• the optical device including:
• a transparent substrate, and
• a multi-layer film including:
• a multi-layer dielectric structure formed on a surface of the transparent substrate and being formed of at least three dielectric layers, a first layer of the at least three dielectric layers contacting the transparent substrate, a second layer of the dielectric layers contacting the first layer and having a higher refractive index, and a third layer of the dielectric layers contacting the second layer and having a lower refractive index, the first layer of the dielectric layers having a refractive index that is intermediate to the higher refractive index and the lower refractive index, and
• a transparent conductive thin film having a predetermined thickness formed atop an outermost one of the at least three dielectric layers of the multi-layer dielectric structure.

An electronic apparatus for displaying information by transmitting light generated inside the apparatus through an optical device disposed in an optical path, the optical device comprising:

• a transparent substrate;
• and
• a multi-layer film including:
• a multi-layer dielectric structure formed on a surface of the transparent substrate and being formed of at least three dielectric layers, a first layer of the at least three dielectric layers contacting the transparent substrate, a second layer of the dielectric layers contacting the first layer and having a higher refractive index, and a third layer of the dielectric layers contacting the second layer and having a lower refractive index, the first layer of the dielectric layers having a refractive index that is intermediate to the higher refractive index and the lower refractive index, and
• a transparent conductive thin film having a predetermined thickness formed atop an outermost one of the at least three dielectric layers of the multi-layer dielectric structure.