Wide-field imaging lens and optical image capturing device for electronic mobile devices

An optical image capturing device comprising a wide-field imaging lens, an infrared (IR) filter and a sensor that are optically coupled, wherein

• the wide-field imaging lens comprises an aperture stop, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element that are located along an optical axis in a sequence from an object side to an image side,
• each of the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element has an aspheric surface,
• the first lens element has a first positive refractive power, a first object-side surface, and a first image-side surface,
• the second lens element has a first negative refractive power, a second object-side surface that is convex in a paraxial region of the second object-side surface, and a second image-side surface that is concave in a paraxial region of the second image-side surface,
• the third lens element has a second positive refractive power, a third object-side surface that is convex in a paraxial region of the third object-side surface, and a third image-side surface that is convex in a paraxial region of the third image-side surface,
• the fourth lens element and the fifth lens element have opposite refractive powers,
• the fourth lens element has a fourth object-side surface that is concave in a paraxial region of the fourth object-side surface, and has a fourth image-side surface that is convex in a paraxial region of the fourth image-side surface, and
• the fifth lens element has a fifth object-side surface that is convex in a paraxial region of the fourth object-side surface, and has a fifth image-side surface of the fifth lens element that is concave in a paraxial region of the fifth image-side surface,
• the optical image capturing device satisfies [Equation 11] and [Equation 17],
• [Equation 11] is expressed as
• 0.32
• <
• BFL
• f
• <
• 0.33
• ,
• in which BFL denotes a back segment of a focal length measured from the fifth image-side surface of the fifth lens element to an image surface, without including a depth of the IR filter,
• [Equation 17] is expressed as
• 2.02
• <
• TTL
• ImgH
• <
• 2.13
• ,
• in which TTL denotes an axial distance between the first object-side surface of the first lens element and an image surface, and ImgH denotes one-half of a diagonal length of a resulting image.