Samsung Patents a Folded Zoom Camera Design That Captures Sharper Distant Shots
Getting a powerful zoom camera into a phone thin enough to pocket means bending light sideways and stacking precisely shaped lenses in a very small space. Samsung's latest patent locks down the exact optical recipe for doing that.
What Samsung's folded-zoom lens rules actually control
Imagine you're taking a photo of something far away with your phone, and the camera actually zooms in rather than just cropping the image. To pull that off in a device thinner than a finger, phone makers use a trick called a periscope camera: a mirror inside the phone bounces light sideways so a long row of lenses can sit horizontally rather than sticking straight out the back.
The challenge is that every lens in that row has to be shaped just right or the image comes out blurry, distorted, or washed out. Samsung's patent lays down a strict set of rules for how those lenses must be curved and what materials they must be made from, so the whole system stays compact while still producing a sharp image.
Think of it like a recipe: the patent specifies that the first lens light hits must curve outward (convex), and further lenses must curve inward (concave) in specific ways. It also sets mathematical limits on the ratio of the camera's focal length to its total physical length, and on the angle of view the camera can capture. All of those constraints working together keep the lens stack short enough to fit inside your phone.
… the plurality of lenses comprises: a first lens that is farthest from the image sensor among the plurality of lenses and has a positive refractive power, wherein the first lens comprises a first surface of the first lens facing away from the image sensor and a second surface of the first lens facing the image sensor …
Translation: The camera uses a specific arrangement of lenses where the outermost lens is shaped to focus light toward the sensor.
How the lens shapes and optical limits work together
The patent describes a lens assembly built around a reflective member (a mirror or prism that folds the optical path) combined with a row of lenses aligned along a single axis. This folded arrangement is what lets a zoom camera live inside a slim phone body.
The claim imposes three hard numerical limits on any lens system that falls under it:
- Abbe number of the first lens between 65 and 81, the Abbe number measures how much a lens material splits white light into colors (like a prism). A high Abbe number means less color fringing, so Samsung is requiring the outermost lens to be made from a low-dispersion glass or plastic.
- EFL/OTTL ratio between 0.56 and 1.33, EFL is the effective focal length (how much the system magnifies), and OTTL is the total physical length of the lens stack from front to back. Keeping this ratio in range means the camera has meaningful zoom power without the lens barrel growing too long to fit in the phone.
- Field of view between 5 and 28 degrees, this brackets the camera as a telephoto (narrow-angle, far-reaching) lens rather than a wide-angle one.
Beyond the numbers, the patent requires the front lens to have a convex first surface (curving toward the scene) and uses aspherical surfaces (non-spherical curves that correct distortion more precisely than simple spheres) on key lenses. The first lens with negative refractive power (one that spreads light rather than focusing it) must have a concave rear surface, a shape that helps counteract the aberrations introduced by the convex front lens.
An electronic device includes a lens assembly including a plurality of lenses aligned along an optical axis, an image sensor including an imaging plane configured to form an image, and a reflective member …
Translation: The device uses a series of lenses and a mirror to direct light onto a sensor to capture a digital image.
What this means for Samsung's thin-phone zoom cameras
For Samsung, periscope cameras are a premium differentiator, appearing in the Galaxy S and Galaxy Z lines to enable 3x, 5x, and 10x optical zoom without a camera bump that dominates the back of the phone. A patent like this, built around precise numerical bounds rather than a broad concept, is the kind of filing that protects a specific engineering solution: the exact combination of lens curvatures, materials, and proportions that Samsung's optical team has worked out to make their particular zoom module perform.
Because the claim is narrow (it only covers assemblies that satisfy all three numerical conditions simultaneously, along with the specific surface shapes), it is less a fence around an entire technology category and more a lock on one carefully tuned implementation. That narrowness limits how much it could block a competitor who simply adjusts the focal-length ratio or uses a slightly different Abbe number material. Still, for readers tracking camera optics, this sits alongside other interesting tech patents in the periscope-lens space, where Samsung, Apple, and others are all filing detailed optical specifications as smartphone zoom races on.
That makes this Samsung's 96th filing we've tracked since May in our camera sensor work, following applications like one on charge-storage pixel design and one on flicker detection.
Claim 1 stacks five conditions that must all be true at once: the front-most lens curves outward and focuses light inward, the first inward-focusing lens behind it has at least one non-perfectly-round curved surface, and three specific numerical ranges are all satisfied together, covering glass purity, how the focal length compares to the total tube length, and how wide the camera can see.
That combination works as a narrow fence around one finished design. Any competing product that falls outside even a single numerical window avoids the claim entirely, which means a rival manufacturer can sidestep it by adjusting lens proportions or glass composition without rebuilding the camera from scratch.
The patent protects a specific, already-realized zoom system and would block copies of that system. It would not stop the broader market from building compact zoom cameras tuned to different optical specifications.
There are more where this came from
We read every patent application Big Tech publishes and send you the ones worth knowing. Plain English, free, every week.
The drawings
23 drawing sheets from US 2026/0251887 A1 · click any drawing to enlarge
Want this weekly breakdown for a company we don't cover? Patentlyze Pro →