OPTICAL ELEMENT AND IMAGING APPARATUS

1 . An optical element comprising:

a transparent substrate configured to transmit light;

a resin layer provided on one surface of the transparent substrate, and configured to transmit light; and

a first antireflection film formed on the resin layer.

2 . The optical element according to claim 1 ,

wherein the transparent substrate is a glass substrate.

3 . The optical element according to claim 1 ,

wherein a refractive index of the resin layer for light with a wavelength of 550 nm is greater than 1.2 but less than or equal to 1.8.

4 . The optical element according to claim 1 ,

wherein a difference in refractive index Δn between the transparent substrate for light with a wavelength of 550 nm and the resin layer for light with a wavelength of 550 nm satisfies 0≦Δn<0.2.

5 . The optical element according to claim 1 ,

wherein a difference in refractive index Δn between the transparent substrate for light with a wavelength of 550 nm and the resin layer for light with a wavelength of 550 nm satisfies 0.2 Δn, and

wherein a product of a thickness t of the resin layer and the difference in refractive index Δn satisfies Δn×t≦300 nm.

6 . The optical element according to claim 1 ,

wherein a thickness of the resin layer is greater than or equal to 10 nm but less than or equal to 50 μm.

7 . The optical element according to claim 1 ,

wherein when light, wavelength of which is in a range of greater than or equal to 480 nm but less than or equal to 600 nm, enters from a side having the first antireflection film, a reflectance at the first antireflection film is less than or equal to 2%.

8 . The optical element according to claim 1 ,

wherein the transparent substrate includes a strengthened glass.

9 . The optical element according to claim 1 ,

wherein a thickness of the transparent substrate is greater than or equal to 0.1 mm but less than or equal to 1 mm.

10 . The optical element according to claim 1 ,

wherein the first antireflection film is a dielectric multi-layer film formed of an inorganic material.

11 . The optical element according to claim 1 ,

wherein the resin layer includes a resin material with a glass-transition temperature of greater than or equal to 35° C.

12 . The optical element according to claim 1 ,

wherein the resin layer includes any one of an acrylic resin, an epoxy resin, a polyester resin, and a silicone resin.

13 . The optical element according to claim 1 ,

wherein the resin layer is provided on another surface of the transparent substrate.

14 . The optical element according to claim 1 ,

wherein a second antireflection film is provided on another surface of the transparent substrate.

15 . The optical element according to claim 14 ,

wherein an antifouling film formed of a material including fluorine is provided on the second antireflection film.

16 . The optical element according to claim 1 further comprising:

a light-shielding film configured to shield a part of light that enters the transparent substrate.

17 . An imaging apparatus comprising:

the optical element according to claim 1 ; and

a solid-state imaging element.

18 . The imaging apparatus according to claim 17 ,

wherein a surface of the optical element on which the first antireflection film is formed and the solid-state imaging element are arranged so as to oppose to each other.

19 . The imaging apparatus according to claim 17 further comprising:

a lens between the optical element and the solid-state imaging element.