Optical sensor

摘要

A monitor-light-emitting device and multiple light-emitting devices are mounted on a board, and a light-guiding member is disposed in front of these devices. Monitor light emitted from the monitor-light-emitting device is directly supplied to a light receiving device. Part of light emitted from the multiple light-emitting devices is incident on the light-guiding member and is used as reference light. The reference light is received by the light receiving device. Reflected detection light that has been reflected off a target object located in front of the optical sensor is transmitted through the light-guiding member and is received by the light receiving device. A condenser is disposed in front of the light receiving device and the reference light or the reflected detection light is efficiently supplied to the light receiving device.

主权项

1. An optical sensor comprising:
a monitor-light-emitting device that emits light at a first timing; an emitting device that emits light at a second timing different from the first timing; a light receiving device arranged adjacent to the monitor-light-emitting device and the light-emitting device; and a light-guiding member disposed in front of the light-emitting device and the light receiving device; wherein reference light corresponding to the light emitted from the light-emitting device propagates through the light-guiding member and is received by the light receiving device; wherein light emitted from the light-emitting device is transmitted through the light-guiding member, and is reflected by a target object located in front of the optical sensor, and is guided back by the light-guiding member to the light receiving device; wherein a visor portion is disposed between the monitor-light-emitting device and the light-guiding member, such that light emitted from the monitor-light-emitting device is directly incident on the light receiving device; and wherein presence or absence of target object is determined based on a measured amount of light received by the light receiving device when the light-emitting device emits light and a measured amount of light received by the light receiving device when the monitor-light-emitting device emits light.