Capsule endoscope

A capsule endoscope comprising:

• a transparent cover member;
• an image sensor having an imaging area that is covered by the transparent cover member;
• and
• an objective optical system which includes at least two lenses;
• wherein
• the lens of the objective optical system that is nearest the image side is integral with, or adhered to, the transparent cover member.

A capsule endoscope comprising:

• an image sensor;
• a transparent cover member that is fixed so as to seal an air space above a surface of the image sensor;
• an objective optical system that includes at least two lenses, with the lens nearest the image side being integral with, or adhered to, the transparent cover member;
• a lens of the objective optical system, other than the lens nearest the image side, is fixed to a single frame;
• and,
• focus adjustment is achieved by adjusting the relative position of the first lens relative to the lens of the objective optical system that is fixed to said single frame.

A method of providing a focusing adjust to a capsule endoscope, wherein

• a transparent cover member, which is integrally molded with a lens of an objective optical system that is located nearest the image side, is fixed so as to cover the surface of an image sensor;
• a lens, which is other than the lens of the objective optical system that is located nearest the image side, is fixed to a single frame;
• and
• the transparent cover member is engaged with said single frame, and focusing adjustment is performed by moving and then fixing said single frame relative to said transparent cover member.