Patent ID: 11960678
Assignee: ALPINE ELECTRONICS, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 4:
5. The proximity detection device according to claim 3, further comprising
a plurality of light detectors that are arrayed along the first side as the light detector,
wherein the proximity detection unit detects the user's approach to the display surface when an intensity of reflected light of the infrared light, represented by a first detected reflection intensity of emitted light of each of the infrared light sources, exceeds a set threshold using the intensity of the reflected light of the infrared light emitted by the infrared light source, detected by the light detector at a position relatively close to the infrared light source having emitted the infrared light, as the first detected reflection intensity of the emitted light of the infrared light source, for each of the plurality of infrared light sources,
the relationship between the first-direction position and the sensitivity is defined as a relationship between the first-direction position and the threshold, and
the sensitivity setting unit
sets the threshold of the proximity detection unit to a threshold determined according to the estimated first-direction position and a preset relationship between the first-direction position and the threshold, and
sets the threshold of the proximity detection unit to a threshold obtained by adjusting the threshold to a smaller threshold, instead of the threshold determined according to the relationship when both an intensity of reflected light of infrared light emitted by an infrared light source near a driver's seat, detected by a light detector relatively far from the infrared light source near the driver's seat, and the first detected reflection intensity of the infrared light source near the driver's seat are larger than a predetermined level.