Samsung Patents a Compact Camera Lens Design That Makes Phone Zoom Thinner
Getting a powerful zoom lens into a phone without a chunky camera bump is one of the trickiest problems in phone design. Samsung's latest patent describes a lens system that literally bends the path of light to make the whole thing flatter.
What Samsung's light-folding zoom lens actually does
You're taking a photo of something far away, and your phone's zoom camera just isn't cutting it. Better zoom usually means a longer lens, and a longer lens means a thicker phone or a bigger bump on the back.
Samsung's patent describes a camera system that gets around this by folding the path of light inside the phone. Instead of traveling in a straight line from the lens to the image sensor, light passes through the lenses and then hits a reflective surface, like a mirror or prism, that redirects it at an angle. The light can be bounced once or twice before it reaches the sensor. That lets engineers fit what would otherwise be a long optical tube into a much shorter physical space.
The specific lens arrangement Samsung describes is carefully tuned so that the first lens (made of plastic, which is lighter than glass) bends light inward, the second corrects for color distortion, and the final lens cleans up the image before it lands on the sensor. The result is a compact zoom camera that Samsung hopes can deliver better image quality without forcing the phone to be thicker.
… a reflective member between the lens group and the image sensor and configured to change a path of light passing through the lens group once or twice …
Translation: A mirror or prism bends the light path inside the phone to save space.
How the mirror bounces light through the lens stack
The patent covers a lens assembly for an electronic device, most likely a smartphone, that uses a reflective member (a mirror or prism) placed between the main lens group and the image sensor to redirect light one or two times. This "folded optics" approach means the physical depth of the camera module doesn't have to match the full optical length of the lens system.
The lens group itself is precisely specified:
- The first lens (closest to the scene being photographed) is made of synthetic resin (plastic) and has positive refractive power, meaning it bends light inward to start focusing it. Its front surface curves outward toward the scene.
- The second lens has negative refractive power (it spreads light slightly to correct the focus), and at least one of its surfaces is aspherical (not a simple curve), which helps reduce distortion and color fringing.
- The final lens in the stack also uses aspherical surfaces and curves toward the scene on its front face, helping to direct light cleanly onto the sensor.
The patent also specifies numerical constraints on the Abbe number of the lenses (a measure of how much a material separates different colors of light). The first and second lenses must differ in Abbe number by between 25 and 60, and the final lens must have an Abbe number below 21. These constraints work together to keep color fringing in check across the folded optical path.
A first lens closest to the subject side includes a synthetic resin and has positive refractive power, and the subject-side surface of the first lens is convex toward the subject side.
Translation: The very first outer lens uses plastic and curves outward to focus incoming light.
What this means for thin phones with long-range zoom
For anyone who cares about phone thickness, this kind of design is directly relevant. The ongoing tension between "thinner phone" and "better zoom camera" has driven phone makers toward folded-optics systems for years, and this patent is Samsung's attempt to specify the exact lens recipe that makes the trade work well. If this design reaches a Galaxy device, you could get more zoom range with less physical bulk.
Samsung's long bet on folded optics suggests the company sees this as a durable approach rather than a stopgap. The Abbe number constraints in the claim are the kind of detail that shows an engineering team has worked through real-world color problems in a folded path, not just described a concept.
Samsung's 129th filing we've tracked since May in our camera sensor push work builds on the five-lens spacing patent and per-zone blur handling.
Plastic lenses expand slightly when warm, and after a few minutes of video or direct sunlight, that expansion can soften focus in ways a user will actually notice. Samsung's design says nothing about correcting for that drift, which matters more here because light travels a longer, folded path before reaching the sensor, giving small errors more distance to grow.
Bouncing light twice instead of once lets the camera fit inside a thinner phone, but each bounce steals a little brightness and adds a surface where scattered light can wash out a shot. Those are real costs, and a patent cannot promise the manufacturing precision needed to keep them small.
The detailed rules Samsung spells out for controlling color fringing suggest this is a finished optical design, not a placeholder. For most people in most lighting conditions, the tradeoffs look reasonable, and a thinner phone with better zoom is exactly what people keep asking for.
There are more where this came from
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The drawings
24 drawing sheets from US 2026/0276950 A1 · click any drawing to enlarge
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