Depth imaging device and angular crosstalk reduced bandpass filter for depth imaging device

摘要

The present invention relates to a depth imaging device used in a time of flight (TOF) camera or a light detection and ranging (LIDAR) device, and an interference filter for the depth imaging device. The present invention provides a depth imaging apparatus comprising an optical transmitter configured to transmit source light and an optical receiver configured to receive reflected light of the source light, comprising: a center wavelength monitoring device for measuring a change in a center wavelength of the source light; An interference filter disposed at the front end of the optical receiver and having a first reflective layer and a second reflective layer facing the first reflective layer, wherein the wavelength of light that enters the interference filter and exits is determined by the first reflective layer and the second reflective layer an interference filter adjusted according to the spacing between the reflective layers; a spacing adjustment mechanism configured to adjust the spacing between the first reflective layer and the second reflective layer; and a controller for adjusting the spacing between the first reflective layer and the second reflective layer by controlling the spacing adjusting mechanism in response to a change in the central wavelength of the source light measured from the central wavelength monitoring device. provide the device.