In the joints of machine tools and industrial robots, numerous motors are used to accurately control their operations. To accurately detect the rotation angle of those motors, optical rotary encoders are widely used. Hamamatsu manufacturers Si photodiodes, photo ICs, LEDs, and so on that are suitable for such encoders and also provides customization of these devices.
Rotary encoders can be classified into two types: magnetic/electric induction type and optical type. The optical type detects rotation angles by detecting the on/off signals of light. This is achieved by placing a code wheel with fine pitch slits between a light emitter (e.g., LED) and photosensor (e.g., photodiode) and blocking and transmitting light.
High accuracy detection requires several features. For the photosensor Si diode, which makes up the encoder, photo detecting chip arrangement that supports complicated slip patterns and high-speed response are required. For the light emitting LED, uniform irradiation is required. Hamamatsu provides light emitters and photo sensors for both transmissive and reflective encoders.
Through-holes can be formed on Si photodiode chips by applying MEMS technology. This allows a current confinement type LED used in reflective encoders and the like to be mounted inside a hole of a Si photodiode chip. Further, the thickness of Si photodiode chip can be adjusted to align the height of the LED emitter to that of the photosensitive area of the 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.
Patent: JP 6383460 B
Hamamatsu offers customization of photo ICs according to the specifications of the encoder the customer will structure. Below are examples of Hamamatsu’s initiatives and customizations of photo ICs for reflective encoders.
・ Monolithic structure of photodiode and peripheral circuit ⇒ Helps reduce the number of parts and mounting space on the customer side
・ Multifunctionalization using I2C ⇒ Enables multifunctionalization such as electron volume
・ Built-in LED and LED driver ⇒ Enables light receiving and emitting photo ICs with LEDs placed in the center of the chip
・ Compensation for variations in reference values (current, voltage) by trimming
Hamamatsu unique semiconductor process
Using on Hamamatsu unique semiconductor process technology, Hamamatsu manufacturers output, highly reliable LED that are suitable for light emitters for encoders.
Hamamatsu produces and provides various types of LEDs for a wide variety of applications including automotive, industrial, and consumer. For optical encoders, Hamamatsu provides collimated LEDs that can irradiate low-focus/dispersion, uniform collimated light suitable for constructing high accuracy encoders.
Operating temperature: -30 to +105 ℃
Storage temperature: -40 to +105 ℃
Packing method: 100 pcs/bag
Operating temperature: -30 to +85 ℃
Storage temperature: -40 to +100 ℃
Packing method: 2000 pcs/reel
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