US 10,254,628 B2 · Lens hood and imaging device

Abstract

The invention provides a lens hood and an imaging device in which a lens hood can be reduced in length while light unnecessary to pick up an image is blocked and the blocking of an effective light beam necessary to pick up an image can be minimized. A lens hood, which blocks unnecessary light to be incident on a telephoto lens, according to an aspect of the invention includes a first light blocking wall that forms a cylindrical outermost periphery, and a concentric second light blocking wall that partitions an internal space of the first light blocking wall into a plurality of spaces. Each of the first and second light blocking walls is provided in parallel to the traveling direction of an effective light beam used to form a subject image within an angle of view of the telephoto lens, and blocks unnecessary light other than the effective light beam.

Claims9

Dependent claims

A lens hood that blocks unnecessary light to be incident on a telephoto lens, the lens hood comprising:

a first light blocking wall that forms a cylindrical outermost periphery;
and
a plurality of second light blocking walls that partition an internal space of the first light blocking wall into a plurality of spaces,
wherein each of the first and second light blocking walls is provided in parallel to the traveling direction of a first effective light beam used to form a subject image within an angle of view of the telephoto lens, and blocks first unnecessary light other than the first effective light beam,
wherein the lens hood is applied to a reflective telephoto lens that includes a reflective optical system reflecting light flux twice or more, and
an angle between a second light blocking wall and an optical axis of the reflective telephoto lens is smaller when a distance between the second light blocking wall and a center of the optical axis of the reflective telephoto lens is greater.

3 more elements

A lens hood that blocks unnecessary light to be incident on a telephoto lens, the lens hood comprising:

a first light blocking wall that forms a cylindrical outermost periphery;
and
a second light blocking wall that partitions an internal space of the first light blocking wall into a plurality of spaces,
wherein each of the first and second light blocking walls is provided in parallel to the traveling direction of a first effective light beam used to form a subject image within an angle of view of the telephoto lens, and blocks first unnecessary light other than the first effective light beam,
wherein the lens hood is applied to a multifocal lens that includes a wide-angle lens provided at a central portion and an annular telephoto lens provided at a peripheral portion of the wide-angle lens, and
the second light blocking wall is provided only in an annular internal space corresponding to the telephoto lens of the multifocal lens.

3 more elements

Dependencies are inferred from the claim text.

Lens hood and imaging device

Life of this patent

Lens hood and imaging device

Life of this patent

Abstract

Claims9