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US 7,701,650 B2Granted
Wide-angle lens module and endoscope
AssigneeHon Hai Precision Industry Co., Ltd.
InventorChun-Ling Lin
Life of this patent
Estimating the term…
Abstract
A wide-angle lens module includes a first lens and a second lens with negative refracting power, a third lens with positive refracting power, a fourth lens with negative refracting power, a fifth lens with positive refracting power, a sixth lens with positive refracting power, and a seventh lens with negative refracting power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are disposed in order from an object side to an image side.
Claims19
A wide-angle lens module comprising:
- a first lens group with negative refracting power;
- and
- a second lens group with positive refracting power, the first lens group and the second lens group being disposed in order from an object side to an image side, the first lens group and the second lens group satisfying:
- −35<f12/f<−10, and 3.5<f14/f<3.9, wherein f12 is an effective focal length of the first lens group, f14 is an effective focal length of the second lens group, and f is a focal length of the wide-angle lens module.
1 more element
An endoscope comprising:
- at least a lamp configured for emitting light beams to illumine a body's internal organ;
- and
- a wide-angle lens module for capturing images of the body's internal organ by receiving light beams reflected from the body's internal organ, the wide-angle lens module including:
- a first lens group with negative refracting power;
- and
- a second lens group with positive refracting power, the first lens group and the second lens group being disposed in order from an object side to an image side, the first lens group and the second lens group satisfying:
- −35<f12/f<−10, 3.5<f14/f<3.9, wherein f12 is an effective focal length of the first lens group, f14 is an effective focal length of the second lens group, and f is a focal length of the wide-angle lens module.
4 more elements
A wide-angle lens module comprising:
- a first lens with negative refracting power;
- a second lens with negative refracting power;
- a third lens with positive refracting power;
- a fourth lens with negative refracting power;
- a fifth lens with positive refracting power;
- a sixth lens with positive refracting power;
- and
- a seventh lens with negative refracting power, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens being disposed in order from an object side to an image side of the wide-angle lens module
- wherein the wide-angle lens module satisfies:
- −0.5<D1/f12<−0.2, and n1>1.8, wherein D1 is an effective light aperture of the first lens, n1 is a refractive index of the first lens, and f12 is an effective focal length of the first lens, the second lens and the third lens.
7 more elements
Dependencies are inferred from the claim text.