Curved prism array applied to an infrared sensor

A curved prism array applied to an infrared sensor which comprises at least an infrared sensing element which is used in detecting infrared signals within a solid-angled FOV and installed inside the curved prism array, wherein the curved prism array comprises:

• an incident focal plane;
• and
• a plurality of emergent focal planes facing toward the infrared sensing element,
• wherein each of the emergent focal planes and the incident focal plane, both of which form an optical focusing structure with an uneven thickness, are not parallel to each other such that the infrared sensing element features an expanded solid-angled FOV;
• the incident focal plane contacted by an incident infrared ray beyond the solid-angled FOV refracts the incident infrared ray, which is subject to a focusing direction of the incident focal plane, at a specific angle such that an internal infrared ray entering a space between the incident focal plane and an emergent focal plane is guided to the emergent focal plane and further refracted at another specific angle under the effect of a focusing direction of the emergent focal plane for development of an emergent infrared ray that emits toward the infrared sensing element for an expanded solid-angled FOV of the infrared sensing element,
• wherein each of the emergent focal planes has a first endpoint and a second endpoint, both of which are opposite to the incident focal plane, and a distance from the first endpoint to the incident focal plane is greater than another distance from the second endpoint to the incident focal plane such that the emergent focal plane and the incident focal plane are not parallel to each other, and
• wherein a thickness from the second endpoint to the incident focal plane is greater than 0.25 mm.