This section provides overview, applications, and principles of photo ic. Also, please take a look at the list of 7 photo ic manufacturers and their company rankings.
A photo IC is an optical device that uses a light-receiving element. Photo IC is a device that incorporates a photosensor and signal processing circuit in a single package, and each product has various functions.
Photo ICs can be classified into monocyclic and hybrid types according to their structure. The mono-silicic type has a light-receiving part and a signal processing circuit on the same chip and is characterized by the absence of wiring between the light-receiving part and the signal processing part, making it highly resistant to noise.
The hybrid type has the photosensitive area and the signal processing circuit on separate chips and housed in a single package. The hybrid type has the advantage that it is easy to change the shape and sensitivity characteristics of the photosensitive area.
Photo ICs are used for light-based detection and have a variety of applications.
Photo ICs are used as illuminance detecting sensors to transmit/receive photo ICs for optical links used in optical fiber communications using plastic optical fibers, etc., photo ICs in encoder modules to detect the amount of movement and rotation angle, photo ICs that output RGB components to detect colors Photo ICs as color sensors, light modulation photo ICs for photoelectric switches to detect objects by light, and many other applications.
A photo IC diode used as an illuminance sensor consists of a photodiode that receives light and generates an electric current and a circuit that amplifies that current. The photovoltaic effect is used.
The photovoltaic effect is a phenomenon in which an electromotive force is generated when light is irradiated. Unlike photo IC diodes, there are also photo ICs whose output is based on frequency. They have a photo IC and a current-to-frequency conversion circuit inside. One of the characteristics of photo ICs is that they have a wide dynamic range.
Typical characteristics of photodiodes include V-I characteristics and spectral sensitivity.
The V-I characteristic of a photodiode is the same as that of a normal pn junction diode in the dark state, but when the photodiode receives light, the V-I characteristic shifts downward. The reverse current that flows at this time becomes the photocurrent used for detection.
Spectral sensitivity indicates how sensitive the photodiode is to the wavelength of light. Photodiodes have different outputs for different wavelengths, and different products have different spectral sensitivities.
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