Back to results
US 12,596,241 B2Granted
Zoom lens and camera device with zoom lens
AssigneeBeijing Xiaomi Mobile Software Co., Ltd.
InventorYasuhiko Obikane
Life of this patent
Estimating the term…
Abstract
A zoom lens is retractable and includes a first lens group, a second lens group and a P-lens group from an object side to an image side along an optical axis, the first lens group has a negative refractive power, and the second lens group has a reflective optical element bending an optical axis. During retraction, the second lens group moves along the optical axis to an image side, and at least a part of the first lens group is retracted into a space generated by the movement of the second lens group.
Claims18
A zoom lens, the zoom lens being retractable, and comprising:
- a first lens group, a second lens group and a P-lens group sequentially from an object side to an image side along an optical axis,
- wherein the first lens group comprises a negative refractive power;
- the second lens group comprises a reflective optical element bending the optical axis;
- and
- during non-zooming retraction, the second lens group moves along the optical axis to the image side, and at least a part of the first lens group is retracted into a space generated by the movement of the second lens group,
- wherein the P-lens group comprises a positive refractive power;
- and when zooming from a wide-angle state to a telephoto state, the first lens group moves along the optical axis to reduce a spacing with the second lens group, the P-lens group moves to reduce a spacing with the second lens group, and a position of the second lens group relative to an image plane on the optical axis is fixed,
- wherein a focal length of the telephoto state is set to ft, a focal length of the wide-angle state is set to fw, a lateral magnification of the P-lens group in infinity focus at the telephoto state is set to bPt, and a lateral magnification of the P-lens group in infinity focus at the wide-angle state is set to bPw, satisfying:
- 0.200≤|(ft/fw)/(bPt/bPw)|≤4.000.
6 more elements
A camera device, comprising:
- a zoom lens, the zoom lens being retractable, and comprising a first lens group, a second lens group and a P-lens group sequentially from an object side to an image side along an optical axis, wherein the first lens group comprises a negative refractive power;
- the second lens group comprises a reflective optical element bending the optical axis;
- and during non-zooming retraction, the second lens group moves along the optical axis to the image side, and at least a part of the first lens group is retracted into a space generated by the movement of the second lens group;
- and
- an imaging element arranged at an image plane position of the zoom lens,
- wherein the P-lens group comprises a positive refractive power;
- and when zooming from a wide-angle state to a telephoto state, the first lens group moves along the optical axis to reduce a spacing with the second lens group, the P-lens group moves to reduce a spacing with the second lens group, and a position of the second lens group relative to an image plane on the optical axis is fixed,
- wherein a focal length of the telephoto state is set to ft, a focal length of the wide-angle state is set to fw, a lateral magnification of the P-lens group in infinity focus at the telephoto state is set to bPt, and a lateral magnification of the P-lens group in infinity focus at the wide-angle state is set to bPw, satisfying:
- 0.200≤|(ft/fw)/(bPt/bPw)|≤4.000.
6 more elements
Dependencies are inferred from the claim text.