Products

Quality Control
We are actively taking measures to improve product quality levels.

Applications

Why Hamamatsu?

Support

Our company

( )

Select your region and country.

HPK_08_Auto wiper-kv_xx

Automatic wiper

The automatic wiper is a function that operates the wiper automatically when it starts to rain. It uses a raindrop detection sensor (rain sensor) to control the wiper.
Normally a rain sensor is installed near the windshield, and combines near-infrared light and Si photodiode to detect raindrops. Hamamatsu offers optical semiconductor devices including infrared LEDs and Sihotodiodes, which can be configured in rain sensors.

In recent years, it is also necessary to make rain sensors more compact and integrated with other sensors that monitor external environment such as sunlight detectors and light and dark detectors, with consideration for the interior design of vehicles when increasing the number of sensors installed in them. Hamamatsu can also provide optical semiconductor devices with custom specifications that meet such requirements.

Mechanism of rain sensor

When there are no raindrops on the windshield, infrared light emitted from the LED is reflected off the windshield surface and strikes the Si photodiode. When there are raindrops on the windshield, less infrared light strikes the Si photodiode, because infrared light has to pass through the raindrops. The principle of this mechanism is to identify whether or not there are raindrops (water). It also distinguishes between heavy rain and light rain based on the amount of light inputting to the Si photodiode, and in order to automatically control the speed of the wiper.

auto_wiper_structure_en.svg

Recommended products

Photosensors (Si photodiodes)

■ Features
・Wide photosensitive area
・Wide temperature range, high reliability
・Low price

s9674_xx.jpg

Si photodiode S9674

A Si photodiode that is applicable to lead-free solder reflow. It features wide operating/storage temperature (-40 to +125 ℃). Photosensitive area: 2 × 2 mm.

s9981-01ct_xx.jpg

Si photodiode S9981-01CT

A Si photodiode that is applicable to lead-free solder reflow. It features wide operating/storage temperature (-40 to +125 ℃). Photosensitive area: 1.3 × 1.3 mm.

 

 

Light emitter (Infrared LED)

■ Features
・High light output
・Wide temperature range, high reliability
・Low price

l9725-01_xx.jpg

Infrared LED L9725-01

A compact, high output infrared LED. Peak emission wavelength: 870 nm.

l9726_xx.jpg

Infrared LED L9726

A compact, high output infrared LED. Peak emission wavelength: 945 nm.

l12171-0087g_xx.jpg

Infrared LED L12171-0087G

A compact COB type high output infrared LED. Peak emission wavelength: 870 nm.

Contact us for more information.

  • Literature
  • Price
  • Delivery
  • Custom order
  • Support
  • Other

Contact us