3D Sensing & Time-of-Flight Patents

3D sensing patents cover structured-light innovations; time-of-flight (dToF/iToF) sensor innovations; illuminator (VCSEL/dot-projector) innovations; and depth-processing and module innovations — with IP held by smartphone giants, image-sensor leaders, and optics/illuminator firms (in a field giving devices depth perception for face recognition, AR, and robotics). MAJOR 3D-SENSING PATENT HOLDERS: APPLE: Face ID STRUCTURED LIGHT (projecting ~30,000 infrared dots and reading the pattern's distortion for a depth map — built on PrimeSense, which Apple acquired) and the rear LiDAR Scanner (direct time-of-flight) — a deep 3D-sensing estate. SONY: the leading depth-sensor manufacturer — direct-ToF (dToF) and indirect-ToF (iToF) CMOS sensors and stacked SPAD (single-photon-avalanche-diode) arrays (Sony supplies depth sensors broadly). STMICROELECTRONICS: FlightSense ToF (SPAD-based proximity/ranging, in many phones) and SPAD technology. ams OSRAM and LUMENTUM and II-VI(Coherent): VCSEL (vertical-cavity surface-emitting laser) illuminators and diffractive dot projectors (Lumentum supplied the Face ID VCSEL). OTHERS: Infineon (REAL3 iToF), Microsoft (Azure Kinect ToF), Himax and Orbbec (structured light), PMD (iToF), and Texas Instruments. Structured light, dToF/iToF sensors, and VCSEL illuminators are the core 3D-sensing patent domains.

Structured-light pattern and triangulation innovations; direct-ToF and SPAD innovations; indirect-ToF phase innovations; and depth-computation and accuracy innovations represent core 3D-sensing patent domains — and the two fundamental depth methods (project-and-triangulate vs. time-the-light) define the field. STRUCTURED-LIGHT PATENTS: projecting a known infrared pattern (a dense dot pattern or coded pattern) and computing depth from how the pattern deforms on the 3D scene (triangulation) — pattern design (random/coded dots for unambiguous correspondence — the PrimeSense/Apple lineage), projector-camera geometry, and the depth-from-pattern computation; structured light gives high accuracy at close range (good for face recognition). DIRECT-TOF (dToF) PATENTS: measuring the actual round-trip flight time of a light pulse to each point using SINGLE-PHOTON AVALANCHE DIODES SPADs (which can time individual photons) and time-to-digital converters, histogramming photon arrivals, and SPAD-array readout — dToF gives true distance and works at longer range (Apple LiDAR Scanner, automotive). INDIRECT-TOF (iToF) PATENTS: measuring depth from the PHASE shift of modulated continuous light (not pulse timing) — demodulation pixels, multi-frequency phase unwrapping (resolving range ambiguity), and motion/multipath correction; iToF gives dense, lower-cost depth (Microsoft Kinect, Infineon). DEPTH-COMPUTATION / ACCURACY PATENTS: depth-map processing, calibration, ambient-light rejection, and multipath/motion artifact correction (these algorithm claims are most defensible tied to the specific sensor). SPAD-based dToF and structured-light pattern/computation are high-value; iToF demodulation/phase-unwrapping is a distinct domain.

VCSEL-laser-illuminator innovations; diffractive dot-projector and optics innovations; module-integration innovations; and eye-safety and power innovations represent additional 3D-sensing patent domains — and the active infrared illuminator (and its optics) is as critical as the sensor. VCSEL-ILLUMINATOR PATENTS: vertical-cavity surface-emitting laser VCSEL arrays as the infrared light source (typically 940 nm, beyond visible and a solar-spectrum dip for outdoor use) — VCSEL array design, power/efficiency, beam quality, addressable/multi-zone VCSELs (illuminating only regions of interest to save power), and on-chip optics. DOT-PROJECTOR / OPTICS PATENTS: diffractive optical elements DOEs and microlens arrays that turn a VCSEL array into the structured dot pattern (the 'dot projector' — replicating a seed pattern into thousands of dots), flood illuminators (for iToF/dToF), collimation, and optical efficiency. MODULE-INTEGRATION PATENTS: integrating illuminator + sensor + optics into a compact module (the Face-ID 'TrueDepth' module), co-packaging, thermal/optical alignment, and miniaturization for phones/wearables. EYE-SAFETY / POWER PATENTS: laser eye-safety (class-1 compliance — interlocks detecting a cracked diffuser that could concentrate the beam, fail-safe monitoring), and low-power operation for always-on/mobile use. SENSOR-FUSION PATENTS: fusing 3D depth with RGB and IMU. VCSEL illuminator design (especially addressable/efficient) and the diffractive dot-projector optics, plus eye-safety interlocks, are the highest-value 3D-sensing illumination IP because the illuminator determines range, power, and safety.

3D sensing startup IP strategy must navigate Apple's structured-light/PrimeSense and LiDAR estate, Sony/STMicroelectronics SPAD/ToF sensor patents, ams/Lumentum VCSEL and dot-projector patents, decades of structured-light, ToF, and SPAD prior art, foundry/sensor-supplier dependencies, a §101 constraint on depth algorithms, and a landscape where module integration, cost, power, and accuracy decide adoption; understand that the basic methods (structured light, dToF, iToF) are well-trodden, so the durable IP is in specific SPAD/sensor designs, VCSEL illuminators (addressable/efficient), dot-projector optics, module integration, eye-safety, and sensor-coupled depth processing, and that manufacturability, cost, and power matter as much as patents; identify whitespace in efficient/addressable VCSELs, high-resolution SPAD dToF, low-power iToF, module miniaturization, and automotive/AR/robotics applications. 3D-SENSING STARTUP IP STRATEGY: BASIC METHODS ARE WELL-TRODDEN — SENSORS, ILLUMINATORS, OPTICS, AND MODULES ARE THE IP: structured light, dToF, and iToF are established (Apple/Sony/ST), so patent specific SPAD/sensor designs, addressable/efficient VCSEL illuminators, dot-projector optics, module integration, and eye-safety — not a generic depth method; EFFICIENT/ADDRESSABLE VCSELs AND SPAD dToF ARE HIGHEST-VALUE WHITESPACE: addressable VCSELs (illuminate only regions of interest, saving power) and high-resolution SPAD direct-ToF (longer range, true distance) are the most differentiated, power/range-decisive IP; MODULE INTEGRATION, COST, AND POWER ARE THE ADOPTION LEVERS: compact, low-cost, low-power 3D modules unlock phones/wearables/robots — patent the integration/miniaturization; EYE-SAFETY INTERLOCKS ARE PATENTABLE AND REQUIRED: class-1 laser safety (cracked-diffuser detection, fail-safe) is both a regulatory requirement and patentable design; DEPTH PROCESSING MUST BE TIED TO THE SENSOR (§101): claim depth/multipath/calibration algorithms with the specific sensor/illuminator, not as bare methods; APPLICATIONS BEYOND PHONES ARE OPEN: automotive in-cabin/exterior, AR/VR, robotics, and industrial 3D are growing application whitespace; WHEN TO PATENT: NOVEL SENSOR/MODULE WITH MEASURED PERFORMANCE: file once a system shows measured results (depth accuracy/precision + range + resolution + power + outdoor/ambient performance + module size + frame rate) vs. structured-light/ToF baselines — measured depth accuracy, range, resolution, power, and module size are the critical 3D-sensing IP metrics; KEY FTO CHECKLIST: Apple Face ID structured-light dot-pattern + PrimeSense + LiDAR dToF + TrueDepth module; Sony stacked SPAD dToF/iToF CMOS depth sensor; STMicroelectronics FlightSense SPAD; ams/Lumentum/Coherent VCSEL + diffractive dot-projector (940nm); Infineon/PMD/Microsoft iToF demodulation phase-unwrapping; structured-light coded-pattern triangulation; SPAD array + time-to-digital histogramming dToF; addressable/multi-zone VCSEL; eye-safety class-1 interlock cracked-diffuser detection; depth-map/multipath/calibration (§101-tied-to-sensor); sensor fusion RGB/IMU.