Aperture mechanism, optical apparatus and manufacturing method thereof

An aperture mechanism comprising:

• a first member to rotate in accordance with aperture operation;
• a rotation regulating section having a first inclined surface inclined with respect to a rotational axis of the first member, to regulate rotation of the first member;
• and
• a second member having a second inclined surface that is inclined with respect to the rotational axis and transfers a rotational driving force between the second inclined surface and the first member, and a third inclined surface provided on a side opposite to the second inclined surface, to rotate in accordance with aperture operation;
• wherein
• the first member has an abutting section capable of abutting against the third inclined surface, and
• when a photographing device has a predetermined focal length, the third inclined surface and the abutting section abut against each other.

An aperture mechanism comprising:

• a first member to rotate in accordance with an aperture operation;
• a rotation regulating section having a first inclined surface inclined with respect to a rotational axis of the first member, to regulate rotation of the first member;
• a second member having a second inclined surface that is inclined with respect to the rotational axis and a third inclined surface provided on a side opposite to the second inclined surface, to rotate in accordance with the aperture operation;
• wherein
• the first member has an abutting section capable of abutting against the third inclined surface, and
• when a photographing device has a predetermined focal length, the third inclined surface and the abutting section abut against each other.

An aperture mechanism comprising:

• a driving member to be driven in accordance with an aperture operation;
• an aperture member forming an aperture to be driven by the driving member;
• a first engagement section that is a projection arranged on at least one of the driving member and the aperture member;
• a second engagement section that is a projection arranged on another of the driving member and the aperture member and that engages with the first engagement section;
• and
• a biasing member that is a leaf spring arranged, between the driving member and the aperture member, to oppose at least one of the first engagement section and the second engagement section, to provide a bias in a direction in which the first engagement section and the second engagement section come into contact with each other.

An aperture mechanism comprising:

• a first member to rotate in accordance with an aperture operation;
• a rotation regulating section having a first inclined surface that is inclined with respect to the rotational axis of the first member, to regulate rotation of the first member;
• a second member having a second inclined surface that is inclined with respect to the rotational axis and a third inclined surface that is provided on a side opposite the second inclined surface, to rotate in accordance with the aperture operation;
• and
• a biasing member that can slide against the second inclined surface accompanying a change of focal length;
• wherein
• The first member has a projection section opposed to the third inclined surface;
• and
• The biasing member supplies a biasing force to the second inclined surface in a direction in which the third inclined surface is made to come into contact with the projection section.

An aperture mechanism provided with:

• a driving member to be driven in accordance with an aperture operation;
• a rotation regulating section having a first inclined surface inclined with respect to a rotational axis of the aperture member, to regulate rotation of the aperture member;
• a first engagement section arranged in at least one of the driving member and the aperture member, the first engagement section having a second inclined surface inclined with respect to a rotational axis of the aperture member;
• a second engagement section arranged in another of the driving member and the aperture member, and engaged with the first engagement section;
• and
• a biasing member fixed to another of the driving member and the aperture member, being capable of sliding against the second inclined surface accompanying a change of focal length, to give a biasing force to the second inclined surface in a direction so that the first engagement section comes into contact with the second engagement section.

A manufacturing method for an aperture mechanism, including steps of:

• providing a first engagement section on at least one of a driving member driven in accordance with an aperture operation and an aperture member having an aperture to be driven by the driving member;
• providing a second engagement section to be engaged with the first engagement section at another of the driving member and the aperture member;
• and
• providing a biasing member to bias the first engagement section in a direction in which the first engagement section and the second engagement section face each other, on at least one of the driving member and the aperture member, being capable of sliding against the first engagement section accompanying a change of focal length.

A manufacturing method for an aperture mechanism, including steps of:

• disposing a rotation regulating section having a first inclined surface inclined with respect to a rotational axis of a first member that rotates in accordance with an aperture operation, in such a manner that rotation of the first member can be regulated;
• and
• disposing a second member having a second inclined surface that is inclined with respect to the rotational axis, and a third inclined surface arranged on a side opposite to the second inclined surface, in such a manner that the second member that rotates in accordance with an aperture operation, can rotate in accordance with the aperture operation;
• providing an abutting section at the first member;
• and
• causing a biasing member to abut the second inclined surface so that a biasing force is generated in a direction such that the third inclined surface comes in contact with the abutting section.