Imaging lens and manufacturing method of light-shielding element
An imaging lens including an aperture and a lens with refractive power arranged from a zoom-in side to a zoom-out side along an optical axis is provided. The aperture includes a substrate and a light-shielding layer. The substrate includes a first middle region and a first outer edge region surrounding the first middle region. The first outer edge region allows visible light and infrared light to substantially pass therethrough. The light-shielding layer includes a second middle region and a second outer edge region surrounding the second middle region. The second outer edge region allows infrared light to substantially pass therethrough and substantially shields visible light. A thickness of the aperture is between 0.01 mm and 0.3 mm along a direction of an optical axis. Furthermore, an imaging lens and a manufacturing method of a light-shielding element are also provided.
1. An imaging lens, comprising:
the following that are sequentially arranged from a zoom-in side to a zoom-out side:
an aperture, comprising:
a substrate, comprising a first outer edge region and a first middle region, wherein the first outer edge region surrounds the first middle region, and the first outer edge region allows visible light and infrared light to substantially pass therethrough; and
a light-shielding layer, disposed on the substrate and comprising a second outer edge region and a second middle region, wherein the second outer edge region surrounds the second middle region, and the second outer edge region allows infrared light to substantially pass therethrough and substantially shields visible light; and
a lens with refractive power;
wherein a thickness of the aperture is between 0.01 mm and 0.3 mm along a direction of an optical axis.
2. The imaging lens according to claim 1 , wherein the substrate has a transmittance of more than 70% to both rays with a wavelength of 800 nm and a wavelength of 530 nm, and the light-shielding layer has a transmittance of more than 70% to a ray with a wavelength of 800 nm and a transmittance of less than 30% to a ray with a wavelength of 530 nm.
3. The imaging lens according to claim 1 , wherein an outer contour and an inner contour of the first outer edge region of the substrate are substantially aligned with an outer contour and an inner contour of the second outer edge region of the light-shielding layer.
4. The imaging lens according to claim 1 , wherein the first middle region and the second middle region are both through holes and do not comprise any solid material.
5. The imaging lens according to claim 1 , wherein the imaging lens has different F-number under an infrared light band and a visible light band.
6. The imaging lens according to claim 1 , wherein the light-shielding element has a transmittance of more than 70% to a ray with a wavelength of 800 nm and a transmittance of less than 30% to a ray with a wavelength of 530 nm.
7. The imaging lens according to claim 1 , wherein the aperture or the light-shielding element is shaped as a hollow circular ring.