Light shielding member, lens unit, camera module, and electronic device

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.

2. The light shielding member of claim 1 , wherein

the ridge is located at a position deviated from a center portion of the metal base material in a thickness direction thereof.

3. The light shielding member of claim 1 , wherein

the ridge is located at a position closer to the rear surface in the thickness direction of the metal base material.

4. The light shielding member of claim 1 , wherein

a length by which the ridge protrudes outward in an in-plane direction of the light shielding member is smaller than a length by which the edge end protrudes toward a center of the opening.

5. The light shielding member of claim 1 , wherein

the metal base material is any one material selected from a group consisting of aluminum, iron, copper, chromium, nickel, cobalt, and alloys of these materials.

6. The light shielding member of claim 5 , wherein

the metal base material is an iron-nickel alloy or an iron-nickel-cobalt alloy.

7. The light shielding member of claim 6 , wherein

the metal base material is Invar or Super Invar.

8. A lens unit, comprising:

the light shielding member of claim 1 ;

a plurality of lenses; and

a lens holder.

9. A camera module, comprising:

the lens unit of claim 8 ; and

an image sensor.

10. An electronic device, comprising the camera module of claim 9 .