Lens system and image photographing apparatus and device

An image photographing apparatus, comprising:

• a photoreceptor, configured to capture light projected onto a surface of the photoreceptor;
• and
• a lens system, configured to refract light that comes from an object field located in front of the image photographing apparatus, to form an image of a scene on an imaging plane that is located on the surface of the photoreceptor,
• wherein the lens system comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens that are sequentially arranged in an optic axis direction from an object side to an image side, wherein the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a negative refractive power, the fourth lens has a positive refractive power, and the fifth lens has a negative refractive power and has a convex image-side surface, and
• wherein the first lens has a convex object-side surface, the second lens has a convex image-side surface and has a concave object-side surface, the third lens has a concave image-side surface, and the fourth lens has a convex image-side surface.

An image photographing device, comprising:

• a processor, a memory, and an image photographing apparatus, wherein the processor, the memory, and the image photographing apparatus are coupled and connected through a bus;
• the memory comprises one or more instructions that are executed by the processor to control an operation of the image photographing apparatus;
• and
• wherein the image photographing apparatus further comprises a photoreceptor and a lens system, wherein the photoreceptor is configured to capture light projected onto a surface of the photoreceptor, and the lens system is configured to refract light that comes from an object field located in front of the image photographing apparatus, to form an image of a scene on an imaging plane that is located on the surface of the photoreceptor,
• wherein the lens system comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens that are sequentially arranged in an optic axis direction from an object side to an image side, wherein the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a negative refractive power, the fourth lens has a positive refractive power, and the fifth lens has a negative refractive power and has a convex image-side surface, and
• wherein the first lens has a convex object-side surface, the second lens has a convex image-side surface and has a concave object-side surface, the third lens has a concave image-side surface, and the fourth lens has a convex image-side surface.