Abstract: A lens barrel includes an optical element, a holding member configured to hold the optical element on an inner surface of the holding member, and an adhesive with which a side surface of the optical element and the inner surface of the holding member are adhered to each other. A hole is formed in the holding member from an outer surface toward the inner surface of the holding member. The adhesive is injected in the hole. A groove is formed in the inner surface of the holding member. The groove communicates with the hole. A fitting portion on the inner surface of the holding member disposed on an outer side of the groove is fitted to the side surface of the optical element.

Abstract: A lens barrel includes an optical element, a holding member configured to hold the optical element on an inner surface of the holding member, and an adhesive with which a side surface of the optical element and the inner surface of the holding member are adhered to each other. A hole is formed in the holding member from an outer surface toward the inner surface of the holding member. The adhesive is injected in the hole. A groove is formed in the inner surface of the holding member. The groove communicates with the hole. A fitting portion on the inner surface of the holding member disposed on an outer side of the groove is fitted to the side surface of the optical element.

Abstract: A stop apparatus including stop blades; a supporting member supporting stop blades rotatably about rotating centers; and a rotating member rotating the stop blades, one of the stop blades or the rotating members, having protruded parts, and the other having recessed parts engaging with the protruded parts, the stop blades including: close blades forming close state by rotating in a direction of closing an opening both during stopping down the opening from open state to predetermined opening diameter state and during stopping down the opening from the predetermined opening diameter state to the close state; and non-close blades rotating in the direction of closing the opening during stopping down the opening from the open state to the predetermined opening diameter state and rotating in a direction of opening the opening during stopping down the opening from the open state from the predetermined opening diameter state to the close state.

Abstract: A lens barrel includes: fixed barrel including straight groove extending in optical axis direction; cam ring rotatable around optical axis relative to the fixed barrel, and provided with first and second cam grooves; first barrel to which sub-barrel to hold first optic is detachably fixed, the first barrel including first cam follower slidably contacting with the straight groove and the first cam groove; second barrel holding second optic, and including second cam follower slidably contacting with the straight groove and the second cam groove; elastic member disposed between the first and second barrels when sub-barrel is fixed to the first barrel, and biasing the first and second barrels oppositely in the optical axis direction; and regulating mechanism regulating position of end of the elastic member relative to the first barrel without fixing the elastic member to the sub-barrel when the sub-barrel is fixed to the first barrel.

Abstract: A stop apparatus including stop blades; a supporting member supporting stop blades rotatably about rotating centers; and a rotating member rotating the stop blades, one of the stop blades or the rotating members, having protruded parts, and the other having recessed parts engaging with the protruded parts, the stop blades including: close blades forming close state by rotating in a direction of closing an opening both during stopping down the opening from open state to predetermined opening diameter state and during stopping down the opening from the predetermined opening diameter state to the close state; and non-close blades rotating in the direction of closing the opening during stopping down the opening from the open state to the predetermined opening diameter state and rotating in a direction of opening the opening during stopping down the opening from the open state from the predetermined opening diameter state to the close state.

Abstract: A lens barrel includes: fixed barrel including straight groove extending in optical axis direction; cam ring rotatable around optical axis relative to the fixed barrel, and provided with first and second cam grooves; first barrel to which sub-barrel to hold first optic is detachably fixed, the first barrel including first cam follower slidably contacting with the straight groove and the first cam groove; second barrel holding second optic, and including second cam follower slidably contacting with the straight groove and the second cam groove; elastic member disposed between the first and second barrels when sub-barrel is fixed to the first barrel, and biasing the first and second barrels oppositely in the optical axis direction; and regulating mechanism regulating position of end of the elastic member relative to the first barrel without fixing the elastic member to the sub-barrel when the sub-barrel is fixed to the first barrel.

Abstract: A stop apparatus includes blades each having a drive pin, a support member supporting pivot members of the blades, and a cam member having cams engaging with the drive pins. The blades form an aperture. The cam member includes cams of which the largest radial distances from the center of the aperture are different from each other. The blades include first blades and second blades. The radial distance from the center of the drive pins of the first blades and that of the drive pins of the second blades are different from each other in an open aperture state. The pivot members of the first and second blades are disposed at positions at a radial distance from the center shorter than the radial distance from the center of a drive pin having the longest radial distance from the center in the open aperture state among the drive pins.

Abstract: A stop apparatus includes blades each having a drive pin, a support member supporting pivot members of the blades, and a cam member having cams engaging with the drive pins. The blades form an aperture. The cam member includes cams of which the largest radial distances from the center of the aperture are different from each other. The blades include first blades and second blades. The radial distance from the center of the drive pins of the first blades and that of the drive pins of the second blades are different from each other in an open aperture state. The pivot members of the first and second blades are disposed at positions at a radial distance from the center shorter than the radial distance from the center of a drive pin having the longest radial distance from the center in the open aperture state among the drive pins.