Rotary operation mechanism, electronic apparatus and projector

A rotary operation mechanism for operating an electronic apparatus that is provided with an apparatus main unit and a case that covers said apparatus main unit, said rotary operation mechanism comprising:

• a rotating member that is rotatably provided in said apparatus main unit;
• a rotary operator for effecting rotary operation of said rotating member;
• and
• an opening that is provided in said case and in which said rotary operator is inserted;
• wherein said rotary operator is supported by said case in a state of engagement that allows free rotation in said opening;
• wherein one of said rotary operator and said rotating member is provided with a first engagement part at a position that is separated in a radial direction from a center of rotation, and the other of said rotary operator and said rotating member is provided with a second engagement part having a gap in which said first engagement part is interposed and that makes contact along a line with said first engagement part and engages with said first engagement part, and
• wherein a plane surface on one of said first engagement part and said second engagement part is in contact along a line with a curved surface on the other one of said first engagement part and said second engagement part.

A rotary operation mechanism for operating an apparatus having a case and a unit formed in said case, said mechanism comprising:

• a rotating member rotatably formed on said unit of said apparatus and comprising a first engagement part;
• and
• a rotary operator for rotating said rotating member, said operator being rotatably formed in an opening of said case of said apparatus and supported by said case, and comprising a second engagement part that engages said first engagement part,
• wherein one of said first and second engagement parts comprises a gap, and the other one of said first and second engagement parts is separated in a radial direction from a center of rotation and inserted into said gap and makes contact along a line with said one of said first and second engagement parts, and
• wherein opposing surfaces of said gap comprise curved surfaces.

A projector, comprising:

• projection optics comprising a lens, for projecting an image;
• a drive mechanism for driving said lens;
• and
• a rotary operation mechanism for operating said drive mechanism, comprising:
• a rotating member rotatably formed in an apparatus and comprising a first engagement part;
• and
• a rotary operator for rotating said rotating member, said operator being rotatably formed in an opening in said apparatus and supported by said apparatus, and comprising a second engagement part that engages said first engagement part,
• wherein one of said first and second engagement parts comprises a gap, and the other one of said first and second engagement parts is inserted into said gap and makes contact along a line with said one of said first and second engagement parts, and
• wherein opposing surfaces of said gap comprise curved surfaces.