31results about How to "Wide field angle" patented technology

A zoom lens system includes a first lens group which has a negative refractive power, a second lens group which has a positive refractive power, and a third lens group which has a positive refractive power in this order from the object side and changes the distances among these lens groups to vary the power from the wide-angle end to the telephoto end. The second lens group has a three-element cemented lens including a positive lens c1, a negative lens c2, and a positive lens c3.

A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a rear unit including one or more lens units, which are arranged in order from the object side to the image side. The zoom lens performs zooming by changing distances between the first, second, and rear lens units. A first focusing unit and a second focusing unit which move independently of each other during focusing are provided. The first and second focusing units are adequately set.

A zoom lens including a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power and a fifth lens group having a negative refractive power, in an order from an object; wherein a variable power from a wide angle end to a telephoto end is performed by changing distances among the respective lens groups, and the fourth lens group comprises a three cemented lens comprising a positive c1 lens, a negative c2 lens, and a positive c3 lens from an order from the object.

A zoom lens includes a negative first lens group, a positive second lens group, and a positive third lens group; wherein, when changing power from a wide-angle end state to a tele end state, the first lens group moves such that air space between the first lens group and the second lens group decreases, and air space between the second lens group and the third lens group increases, and the second lens group moves toward the object side; and wherein the first lens group includes a negative lens with both faces formed aspherically and the concave face facing the image side, and a positive meniscus lens with at least one face formed aspherically and the convex face facing the object side, satisfying2.8<|f1 / fw|<3.3where f1 represents the focal length of the first lens group, and fw represents the entire focal length in the wide-angle end state.

The present invention discloses a short-range optical amplification module, which includes, sequentially from the image side to the object side, a reflective polarizing plate, a first phase delay plate, a third lens and a second phase delay plate, wherein the short-range optical amplification module further includes a first lens and / or a second lens that are / is located on either side of any one of the reflective polarizing plate, the first phase delay plate, the third lens and the second phase delay plate. In the third lens, the optical surface adjacent to the second phase delay plate is a transflective optical surface; the reflection surface-containing focal length f3 of the third lens meets the following condition: 1F≤f3≤2F, wherein F is the focal length of the short-range optical amplification module. By performing parameter refining on the f3 that influences the optical amplification effect, the module can keep a small overall thickness while obtaining a large optical amplification effect and it can be applied in a small-size VR device, so that the VR device can realize a wide field angle, a large eyebox and high-quality imaging effect, and hence a better user experience.