Abstract: A camera body includes a plurality of body-side bayonet lugs which are provided on the peripheral edge of an opening; and a protrusion which is positioned in a circular-arc opening formed between adjacent body-side bayonet lugs of the body-side bayonet lugs, the distance between the protrusion and either of adjacent two body-side bayonet lugs of the body-side bayonet lugs being shorter than each of the lens-side bayonet lugs; and a body-side mount surface with which the lens-side bayonet surface comes into contact from the front side when the lens-side bayonet lugs are positioned immediately behind the body-side bayonet lugs.

Abstract: A camera body includes a body-side bayonet lug, wherein a lens-side bayonet lug of a lens barrel is positioned immediately behind the body-side bayonet lug when the lens barrel is mounted to the camera body; an opposed surface formed on the rear surface of the body-side bayonet lug and positioned immediately in front of the lens-side bayonet lug; a body-side mount surface positioned in front of the opposed surface and with which the lens-side bayonet surface comes into contact; and a body-side contact portion, the front end of which contacts the rear end of the lens-side contact portion when the opposed surface faces the lens-side bayonet lug, the front end of the body-side contact portion being positioned in front of the opposed surface and behind the body-side mount surface.

Abstract: A camera body includes body-side bayonet lugs concentric with lens-side bayonet lugs, circular-arc openings, a circular arc protrusion positioned inside the camera body and projecting forward and concentric with the body-side bayonet lugs, body-side contact portions provided and arranged on the front end surface of the circular arc protrusion and come into contact with lens-side contact portions which are provided on the lens barrel, and rearward biasers provided immediately behind two of the body-side bayonet lugs to bias and move the lens-side bayonet lugs rearward, wherein two of the body-side contact portions located at both ends in the lengthwise direction and the two rearward biasers lie on radial-direction extension lines of the circular arc protrusion, respectively, as viewed in an optical axis direction.

Abstract: A camera body includes body-side bayonet lugs concentric with lens-side bayonet lugs, circular-arc openings, a circular arc protrusion positioned inside the camera body and projecting forward and concentric with the body-side bayonet lugs, body-side contact portions provided and arranged on the front end surface of the circular arc protrusion and come into contact with lens-side contact portions which are provided on the lens barrel, and rearward biasers provided immediately behind two of the body-side bayonet lugs to bias and move the lens-side bayonet lugs rearward, wherein two of the body-side contact portions located at both ends in the lengthwise direction and the two rearward biasers lie on radial-direction extension lines of the circular arc protrusion, respectively, as viewed in an optical axis direction.

Abstract: A camera body includes a plurality of body-side bayonet lugs which are provided on the peripheral edge of an opening; and a protrusion which is positioned in a circular-arc opening formed between adjacent body-side bayonet lugs of the body-side bayonet lugs, the distance between the protrusion and either of adjacent two body-side bayonet lugs of the body-side bayonet lugs being shorter than each of the lens-side bayonet lugs; and a body-side mount surface with which the lens-side bayonet surface comes into contact from the front side when the lens-side bayonet lugs are positioned immediately behind the body-side bayonet lugs.

Abstract: A camera body includes a body-side bayonet lug, wherein a lens-side bayonet lug of a lens barrel is positioned immediately behind the body-side bayonet lug when the lens barrel is mounted to the camera body; an opposed surface formed on the rear surface of the body-side bayonet and positioned immediately in front of the lens-side bayonet lug; a body-side mount surface positioned in front of the opposed surface and with which the lens-side bayonet surface comes into contact; and a body-side contact portion, the front end of which contacts the rear end of the lens-side contact portion when the opposed surface faces the lens-side bayonet lug, the front end of the body-side contact portion being positioned in front of the opposed surface and behind the body-side mount surface.

Abstract: A method for optimizing a structure of an industrial product includes selecting control factors from among manufacturing parameters affecting a target characteristic, which is scheduled to be manufactured by a sequence of manufacturing processes; setting levels to the respective control factors; selecting a reference characteristic having a trade-off relation with the target characteristic from among characteristics of the structure; setting a reference value to the reference characteristic; selecting a prior adjustment factor affecting the reference characteristic; creating conditions for experiments assigning combinations of the levels to the respective control factors; determining an adjustment value of the prior adjustment factor so that each of characteristic values of the reference characteristic obtained by the experiments conforms substantially to the reference value; and determining experimental characteristic values of the target characteristic using the adjustment value.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A method for optimizing a structure of an industrial product includes selecting control factors from among manufacturing parameters affecting a target characteristic, which is scheduled to be manufactured by a sequence of manufacturing processes; setting levels to the respective control factors; selecting a reference characteristic having a trade-off relation with the target characteristic from among characteristics of the structure; setting a reference value to the reference characteristic; selecting a prior adjustment factor affecting the reference characteristic; creating conditions for experiments assigning combinations of the levels to the respective control factors; determining an adjustment value of the prior adjustment factor so that each of characteristic values of the reference characteristic obtained by the experiments conforms substantially to the reference value; and determining experimental characteristic values of the target characteristic using the adjustment value.

Abstract: A method for optimizing a structure of an industrial product includes selecting control factors from among manufacturing parameters affecting a target characteristic, which is scheduled to be manufactured by a sequence of manufacturing processes; setting levels to the respective control factors; selecting a reference characteristic having a trade-off relation with the target characteristic from among characteristics of the structure; setting a reference value to the reference characteristic; selecting a prior adjustment factor affecting the reference characteristic; creating conditions for experiments assigning combinations of the levels to the respective control factors; determining an adjustment value of the prior adjustment factor so that each of characteristic values of the reference characteristic obtained by the experiments conforms substantially to the reference value; and determining experimental characteristic values of the target characteristic using the adjustment value.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A method for optimizing a structure of an industrial product includes selecting control factors from among manufacturing parameters affecting a target characteristic, which is scheduled to be manufactured by a sequence of manufacturing processes; setting levels to the respective control factors; selecting a reference characteristic having a trade-off relation with the target characteristic from among characteristics of the structure; setting a reference value to the reference characteristic; selecting a prior adjustment factor affecting the reference characteristic; creating conditions for experiments assigning combinations of the levels to the respective control factors; determining an adjustment value of the prior adjustment factor so that each of characteristic values of the reference characteristic obtained by the experiments conforms substantially to the reference value; and determining experimental characteristic values of the target characteristic using the adjustment value.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A dioptric power distribution measuring device (1) measures the dioptric power distribution of a target lens. A computer (3) constructs a design lens spatial model in a virtual space, and calculates the dioptric power distribution of the design lens spatial model by performing simulation processing for incident/exit light for only the same point in the design lens spatial model as a measurement point on the target lens. The computer then compares the calculated dioptric power distribution with the dioptric power distribution of the target lens which is measured by the dioptric power distribution measuring device (1).

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A dioptric power distribution measuring device (1) measures the dioptric power distribution of a target lens. A computer (3) constructs a design lens spatial model in a virtual space, and calculates the dioptric power distribution of the design lens spatial model by performing simulation processing for incident/exit light for only the same point in the design lens spatial model as a measurement point on the target lens. The computer then compares the calculated dioptric power distribution with the dioptric power distribution of the target lens which is measured by the dioptric power distribution measuring device (1).

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.