- Contrinex AG
 - Manufacturer of inductive and photo-electric proximity switches. - Electro-Optical Systems
- Manufacturer of infrared detectors, photodiodes, quadrant detectors, receiver modules, and position sensors for the UV/vis to infrared spectrum.
- Elesta optosensorics
- Offers standard sensors, customer adapted sensors, and more.
- International Light Inc
- Light Measurement Instruments: light meters, radiometers, photometers, spectroradiometers, UV detectors.
- Kolmar Technologies
- Manufactures infrared detectors and amplifiers for laboratory and industrial instruments.
- Molectron Detector, Inc.
- Laser power and energy meters incorporating patented pyroelectric and thermopile sensor technology.
- OmniVision Technologies (1)
- Opto Technology
- Light sensing and emmiting electronics.
- Panavision SVI, LLC
- Makers of ACS CMOS image sensors and camera modules in both line scan and multi-megapixel 2D arrays.
- Pantron Automation
- Photoelectric sensors and controls designed for automation in harsh environments.
- Peripheral Imaging Corporation
- Designer and manufacturer of contact image sensor modules and CMOS image sensor ICs.
- Photobit Corporation
- Designers of CMOS active pixel sensor (APS) electronic image capture technologies.
- Sensoptic SA
- Manufactures optical sensors for dimensional measurements.
- Sick Optic-Electronic, Inc.
- Photoelectric sensors, industrial sensors, safety controls, and environmental monitors.
- Sofradir
- Infrared detectors and sensors for military, space, and commercial applications.
- Solartech, Inc.
- Features hand-held digital ultraviolet meters.
- Tri-Tronics Co Inc.
- Manufacturer of photoelectric sensors, fibre-optics and controls.
- Wavelength Electronics
- Manufacturer of laser diode drivers and thermoelectric control products
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