It is easy to think, "In winter, blood vessels may shrink or blood flow may become poor."
In an environment where frostbite or frostbite occurs, blood flow may fluctuate, but in general, there is no major change in blood flow and the certification rate is not affected.
As a case where it is not possible to authenticate successfully in the winter, if you perform finger vein authentication immediately after entering the room from the outside where the temperature is low , even if you intend to hold your finger straight over the authentication device, your hand will be inserted and your fingertips will be slightly inside. It is assumed that there is a "bent" .
If authentication is not successful due to such reasons,
- Clap your hands and applause a few times before you authenticate.
- Alternatively, if you use a fist, your fingers will be easier to stretch straight.