Patent ID: 11973097
Assignee: TOPPAN HOLDINGS INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. A light shielding member formed of an annular metal base material, comprising:
a front surface;
a rear surface facing away from the front surface; and
an outer peripheral surface connecting between the front surface and the rear surface, in an outer periphery of the light shielding member, wherein
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, wherein external light is incident on the front surface of the light shielding member;
the light shielding member includes an opening penetrating the metal base material in a thickness direction thereof;
the opening is enclosed by an inner peripheral surface;
the inner peripheral surface has a tapered shape in which an opening diameter in the front surface is larger than an opening diameter in the rear surface;
when the light shielding member is imaged in the radial direction thereof by bringing the ridge into focus under an imaging condition of a depth of field being 0.4 μm, a portion having a first thickness including the ridge is focused in the light shielding member in the thickness direction;
when the light shielding member is imaged in the radial direction thereof by bringing an edge end of the opening into focus under the imaging condition of a depth of field being 0.4 μm a portion having a second thickness including the edge end is focused in the light shielding member in the thickness direction; and
the first thickness is larger than the second thickness.