Using our unique semiconductor process technology, we manufacture high sensitivity, low noise, highly reliable photodiodes that are suitable photosensors for encoders. We also have a proven track record of manufacturing numerous industrial photodiodes.
We can manufacture photodiodes with high sensitivity for the wavelength of the light source to be used, from visible light to infrared light. A higher signal-to-noise ratio can be expected by optimizing the photodiode's sensitivity for the LED used in the optical encoder.
We supply products in various package types for many applications including automotive, industrial and consumer. We can offer a wide variety of mounting solutions, including miniature photodiode packages and a single package combining an LED and photodiode.
Through-holes can be formed on Si photodiode chips by applying MEMS technology. This allows a confinement type LED used in reflective encoders and the like to be mounted inside the hole of a Si photodiode chip. Further, the chip's thickness can be adjusted to align the height of the LED emitter to that of the photosensitive area of the Si photodiode.
Example: LED is mounted inside a through-hole of a Si photodiode
It is possible to mount a Hamamatsu fiber optic plate (FOP) to the photosensitive area of a Si photodiode. Combining an FOP and Si photodiode allows the lens to focus at a position that is higher by the amount of the FOP thickness than the normal photosensitive surface. This makes it easier to mount a slip plate or other components closer to the photosensitive surface. Moreover, the photosensitivity directivity can be adjusted by using an FOP with a low NA.
Example: Si photodiode with an FOP
The reflectance of metal wiring and components other than the photosensitive area can be reduced by applying a light-shielding film to the surface of the Si photodiode through special processing. Improvement to the signal-to-noise ratio can be expected.
Reflectance vs. wavelength (reference value)
The reflectance of near-infrared light often used in optical encoders is reduced significantly.
Example: Si photodiode with a light-shielding film
Silicon photodiodes and fiber optic mounting plate for encoders.
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