Projection lens and projection device
The projection lens includes: a third optical system that projects an image light toward a screen and that includes an emission lens located on a most projection surface side; and a light receiver. The light receiver receives an optical signal from the remote controller. The light receiver is attached to a position capable of receiving the optical signal transmitted through an emission lens, specifically, to a holding frame, and more specifically, to a first surface of the holding frame.
1 . A projection lens that projects an image light onto a projection surface, the projection lens comprising:
an optical system including a first lens located on a most projection surface side;
a light receiver that receives an optical signal from a remote controller, the light receiver being disposed at a position capable of receiving the optical signal transmitted through the first lens; and
a holding frame that holds the first lens,
wherein the light receiver is attached to the holding frame,
wherein the optical system includes a second lens disposed on a side opposite to the projection surface of the first lens, the second lens having a lens surface with a radius smaller than a radius of a lens surface of the first lens,
wherein the holding frame has
a first surface facing an end portion of the first lens,
a second surface facing an end portion of the second lens, and
an intermediate surface extending in a radial direction and interconnecting the first surface and the second surface, and
wherein the light receiver is attached to at least one of the first surface, the second surface, or the intermediate surface.
2 . The projection lens according to claim 1 ,
wherein the optical system is a magnifying optical system that magnifies and projects the image light toward the projection surface.
3 . The projection lens according to claim 1 ,
wherein the light receiver is attached to the first surface or the intermediate surface.
4 . The projection lens according to claim 3 , further comprising:
a circuit board on which a control circuit that controls an operation of the light receiver is mounted,
wherein the light receiver is disposed on a side of the first surface, the second surface, or the intermediate surface, and
the circuit board is disposed on a side of a surface of the holding frame, which is on a side opposite to the first surface, the second surface, or the intermediate surface.
5 . The projection lens according to claim 3 ,
wherein in a case where the radius of the lens surface of the first lens is denoted by G1 and the radius of the lens surface of the second lens is denoted by G2, a value of G1/G2 is 1.7 or more, and
the light receiver is attached to the intermediate surface.
6 . The projection lens according to claim 3 ,
wherein the first lens or the second lens has a recess portion provided in a surface on the side opposite to the projection surface, and
the light receiver is disposed in the recess portion.
7 . The projection lens according to claim 1 , further comprising:
a circuit board on which a control circuit that controls an operation of the light receiver is mounted,
wherein the light receiver is disposed on a side of the first surface, the second surface, or the intermediate surface, and
the circuit board is disposed on a side of a surface of the holding frame, which is on a side opposite to the first surface, the second surface, or the intermediate surface.
8 . The projection lens according to claim 7 ,
wherein in a case where the radius of the lens surface of the first lens is denoted by G1 and the radius of the lens surface of the second lens is denoted by G2, a value of G1/G2 is 1.7 or more, and
the light receiver is attached to the intermediate surface.
9 . The projection lens according to claim 1 ,
wherein in a case where the radius of the lens surface of the first lens is denoted by G1 and the radius of the lens surface of the second lens is denoted by G2, a value of G1/G2 is 1.7 or more, and
the light receiver is attached to the intermediate surface.
10 . The projection lens according to claim 1 ,
wherein the first lens or the second lens has a recess portion provided in a surface on the side opposite to the projection surface, and
the light receiver is disposed in the recess portion.
11 . The projection lens according to claim 10 ,
wherein the first lens or the second lens is made of a resin, and
the recess portion is formed by an ejector pin used in a case where the first lens or the second lens is extruded from a mold.
12 . The projection lens according to claim 1 ,
wherein the first lens has a straight end part and a curved end part, and
the light receiver is disposed at a position facing the straight end part.
13 . The projection lens according to claim 1 , further comprising:
a connection portion that is electrically connected to a projection device including an image forming unit that forms the image light,
wherein the light receiver transmits the optical signal to the projection device via the connection portion.
14 . The projection lens according to claim 13 ,
wherein the projection lens is attachable to and detachable from the projection device through the connection portion.
15 . The projection lens according to claim 1 , wherein the remote controller is operated toward the first lens, and the optical signal emitted from the remote controller is transmitted through the first lens and received by the light receiver.
16 . A projection device comprising:
the projection lens according to claim 1 ; and
an image forming unit that forms the image light projected onto the projection surface through the projection lens.