113results about How to "Shorter overall optical length" patented technology

Provided are a wafer scale lens, which is so short in an optical total length with respect to an image height that it can correct an aberration satisfactory, and an optical system including the wafer scale lens and having a thin lens element on the side closest to the image. The optical system includes a first lens having a positive refractive power relative to an object, and a second lens arranged on the side of the image of the first lens and having a recessed shape on the side of the object. At least one lens is arranged on the side of the second lens. When that one of the lenses arranged on the side of the image of the second lens, which is arranged on the side closest to the image, is an i-th lens (i>3), this i-th lens includes an i-th lens flat plate and is formed on the object side of the i-th lens flat plate but has a refractive index different from that of the i-th lens flat plate, and a lens element having a convex shape on the object side where the main light ray of the maximum image height passes. Moreover, the ratio between the optical axial distance (or the lens distance) between a (i−1)-th lens and the i-th lens and the optical axis distance (or the optical total length) from the object side face of the first lens to the image face is 0.01 to 0.15.

An optical lens assembly for image taking, sequentially arranged from an object side to an image side, comprising: the first lens element with positive refractive power having a convex object-side surface; the second lens element with negative refractive power having a convex object-side surfaces and a concave image-side surface; the third lens element with positive refractive power having a convex image-side surface; the fourth lens element with refractive power having two aspheric optical surfaces; the fifth lens element with refractive power having a concave object-side surface and both aspheric optical surfaces; an image sensor disposed on an image plane and a stop provided for imaging a photographed object; specific relations being satisfied. Thereby, the optical lens assembly for image taking has good aberration correction, and can shorten the total length for use in compact cameras and mobile phones requiring high resolution.

The invention discloses an optical imaging lens comprising a first lens which has positive refractive power and a convex object side surface; a second lens which has negative refractive power and a convex object side surface and a concave image side surface; a third lens which has positive refractive power; a fourth lens which has negative refractive power; a fifth lens which has positive refractive power, wherein the position of the object side surface close to the optical axis is a convex surface and the area away from the optical axis is a concave surface, the object side surface is provided with at least one point of inflexion, the position of the image side surface close to the optical axis is a convex surface and the object side surface and the image side surface are aspheric surfaces; and a sixth lens which has negative refractive power, wherein the positions of the object side surface and the image side surface close to the optical axis are concave surfaces, the image side surface is provided with at least one point of inflexion and the object side surface and the image side surface are aspheric surfaces. According to the optical imaging lens, miniaturizing and lightweightand thinning can be met and the aberration and astigmatism can be reasonably corrected so that the imaging frame has low distortion and high definition. The invention also discloses photographing equipment comprising the optical imaging lens.

The invention discloses an imaging optics lens group which sequentially comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power and a fifth lens from an object side to an image side, wherein the object side surface of the first lens is a convex surface; the objectside surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a concave surface, and the object side surface and the image side surface of the fourth lens are both aspheric surfaces; and the image side surface of the fifth lens is a concave surface, and the object side surface and the image side surface of the fifth lens are both aspheric surfaces. The imaging optics lens group is additionally provided with an aperture and an electronic photosensing unit for imaging a shot object, wherein the aperture is arranged between the shot object and the second lens, and the electronic photosensing unit is arranged at an imaging surface. Through the arrangement way of the lens group in the invention, the volume of the lens group can be effectively reduced, the sensitiveness of an optics system can be lowered, and higher resolution can be obtained.

A zoom lens system comprising a first lens unit of negative power, a second lens unit of positive power and a third lens unit of positive power, wherein in zooming, the lens units move respectively along an optical axis so that an interval of first lens unit and second lens unit decreases while an interval of second lens unit and third lens unit changes with variable magnification, the first lens unit comprises one object side negative lens element and one image side positive lens element, which have an aspheric surface, and the conditions: n 12>1. 88, ν12<26 and 5.0<αi_W<20.0 (ω_W>30, n12 and ν12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit, αi _W is an incident angle of the principal ray onto the image sensor at the maximum image height at a wide-angle limit) are satisfied.

The invention discloses a photographing optical lens. The optical lens comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with the positive refractive power and a fourth lens with the negative refractive power from an object side to an image side in turn and is provided with a diaphragm, wherein an object side surface of the first lens is a convex surface; an image side surface of the second lens is a concave surface; an image side surface of the fourth lens is a concave surface, and an object side surface and the image side surface of the fourth lens are aspheric surfaces; and the diaphragm is arranged between the first lens and the second lens. In the invention, four lenses with refractive power are arranged in the photographing optical lens.

The invention discloses an optical shot for image capture. The optical shot comprises five lenses with refractive power, which, from an object side to an image side, are sequentially a first lens with positive refractive power, a second lens with negative refractive power, a third lens, a fourth lens with positive refractive power and a fifth lens with negative refractive power, wherein the object side surface of the first lens is a convex surface; the object side surface of the second lens is a concave surface; the object side surface of the fourth lens is a convex surface, and at least one surface of the object side surface and the image side surface of the fourth lens is an aspheric surface; and the object side surface of the fifth lens is a concave surface, and at least one inflectionpoint is formed on the image side surface of the fifth lens. The optical shot for image capture is also provided with an aperture and an electric photosensitive element for imaging a photographed object; and the aperture is arranged between the photographed object and the second lens. Through the mode of configuring the lens group, the shot volume can be effectively reduced, the sensitivity of anoptical system can be reduced, and higher resolution power can be acquired.

An optical image stabilizer includes an optical system including at least one image shake counteracting optical element movable in a plane orthogonal to an optical axis; at least one stepping motor for moving the image shake counteracting optical element in the plane; at least one shake velocity sensor which senses the speed of shake applied to the optical system; and a controller which calculates the number of driving pulses for the stepping motor based on shake speed information output from the shake velocity sensor, and drives the stepping motor so that the image shake counteracting optical element moves in the plane to counteract image shake on an imaging surface of the optical system. The controller changes power supplied to the stepping motor in accordance with the shake speed information when driving the stepping motor.

The present invention relates to an imaging lens with an F-number in the range 2.0 to 4.0, configured from only two lenses, with a short lens optical length, and with sufficiently high image contrast so that sharp images are obtained. The imaging lens is configured by positioning, in order from an object side to an image side, an aperture diaphragm, a first lens, a second diaphragm, and a second lens, satisfying the following conditions. The first lens and second lens are both meniscus-shaped with convex surface facing the object side, and have positive refractive power.

0.3<f₁/f₂<1.0   (1)

0.4<b_f/f<0.5   (2)

1.0<d/f<1.3   (3)

0.12<D₂/f<0.30   (4)

2.0<F_no<4.0   (5)

Here f is the combined focal length of the imaging lens, f₁ is the focal length of the first lens, f₂ is the focal length of the second lens, b_f is the distance (in air) from the image-side surface of the second lens to the image plane, d is the distance (in air) from the object-side surface of the first lens to the image plane, D₂ is the interval between the first lens and the second lens, and F_no is the F-number.

The invention provides an image capturing lens group, from an object side to an image side, which orderly comprises a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein the first lens has positive refractive power, and an object side surface of the first lens is a convex surface; the second lens has negative refractive power; the third lens has the positive refractive power, and the object side surface of the third lens the concave surface while an image side surface thereof is the convex surface, and the object side surface and the image side surface of the third lens are both aspheric surfaces; the fourth lens has the negative refractive power, the image side surface of the fourth lens is the concave surface provided with at least one inflection point, and the object side surface and the image side surface of the fourth lens are both aspheric surfaces; and the aperture is located between a photographed object and the first lens. Only four of the lenses of the image capturing lens group have the refractive power. With the configuration mode of the lens group, volume of a camera lens can be reduced, sensitivity of an optical system is reduced, and higher resolving power can be obtained.

The invention discloses an optical photographic system, which comprises four lenses with refracting power, sequentially comprising a first lens, a second lens with a positive refracting power, a third lens with a negative refracting power and a forth lens with a positive refracting power from the object side to the image side, wherein at least one of an object side surface and an image side surface of the second lens is an aspheric surface; an object side surface of the third lens is a concave surface; an image side surface of the third lens is a convex surface; the object side surface and the image side surface of the third lens are aspheric surfaces respectively; an object side surface and an image side surface of the fourth lens are aspheric surfaces respectively; and the optical photographic system also comprises an aperture which is arranged between an photographed object and the second lens. In the configuration mode of the lens group, the total length of the lenses can be effectively shortened, a wider viewing angle is provided and favorable imaging quality can be obtained.