Abstract: A light shielding member formed of an annular metal base material includes a front surface, a rear surface facing away from the front surface, and an outer peripheral surface connecting the front and rear surfaces in an outer periphery of the light shielding member. The outer peripheral surface includes a ridge that is protruded outward furthest therein in a radial direction of the light shielding member, in a cross section that is parallel to a plane perpendicular to the front surface.

Abstract: A light shielding plate includes: a front surface located on a light entry side; a rear surface facing away from the front surface; and a hole extending through between the front surface and the rear surface. The hole includes a first hole portion and a second hole portion connected to the first hole portion at a center opening. The first hole portion extends from a rear surface opening in the rear surface to the center opening and is tapered in shape from the rear surface toward the front surface. The second hole portion extends from a front surface opening in the front surface to the center opening and is tapered in shape from the front surface toward the rear surface. The front surface opening is larger in size than the rear surface opening.

Abstract: A light shielding plate includes a front surface located on a light incident side, a rear surface opposite to the front surface, and a hole passing through the light shielding plate between the front surface and the rear surface. The hole has a first hole portion and a second hole portion connected to the first hole portion at an intermediate opening thereof. The first hole portion extends from a rear surface opening on the rear surface to the intermediate opening and is shaped so as to taper from the rear surface toward the front surface. The second hole portion extends from a front surface opening on the front surface to the intermediate opening and is shaped so as to taper from the front surface toward the rear surface. The front surface opening is larger than the rear surface opening. The intermediate opening has a circularity of 3 ?m or less.

Abstract: A light shielding plate including a front surface located on a light incident side, a rear surface facing away from the front surface, and an aperture penetrating through the front and rear surfaces. The aperture includes a first aperture portion and a second aperture portion connected to the first aperture portion via a central opening. The first aperture portion extends from a rear opening in the rear surface toward the central opening and has a shape tapered from the rear surface toward the front surface. The second aperture portion extends from a front opening in the front surface toward the central opening and has a shape tapered from the front surface toward the rear surface. The front opening is larger than the rear opening.

Abstract: A light shielding plate includes a front surface that is located on a light incident side, a rear surface that is a surface facing away from the front surface, and an aperture that penetrates through the front surface and the rear surface. The aperture has a first aperture portion and a second aperture portion that is connected to the first aperture portion via a central opening, and the first aperture portion extends from a rear opening in the rear surface toward the central opening and has a shape tapered from the rear surface toward the front surface. The second aperture portion extends from a rear opening in the front surface to the central opening and has a shape tapered from the front surface toward the rear surface. The front opening is larger than the rear opening.

Abstract: A light shielding plate includes: a front surface located on a light entry side; a rear surface facing away from the front surface; and a hole extending through between the front surface and the rear surface. The hole includes a first hole portion and a second hole portion connected to the first hole portion at a center opening. The first hole portion extends from a rear surface opening in the rear surface to the center opening and is tapered in shape from the rear surface toward the front surface. The second hole portion extends from a front surface opening in the front surface to the center opening and is tapered in shape from the front surface toward the rear surface. The front surface opening is larger in size than the rear surface opening.

Abstract: A light shielding member formed of an annular metal base material includes a front surface, a rear surface facing away from the front surface, and an outer peripheral surface connecting the front and rear surfaces in an outer periphery of the light shielding member. The outer peripheral surface includes a ridge that is protruded outward furthest therein in a radial direction of the light shielding member, in a cross section that is parallel to a plane perpendicular to the front surface.