DEPTH IMAGING DEVICE AND DEPTH IMAGING DEVICE INTERFERENCE FILTER HAVING REDUCED CROSSTALK RESULTING FROM ANGLE OF INCIDENCE

摘要

The present invention relates to a depth imaging device to be used for a time of flight (TOF) camera or a light detection and ranging (LIDAR) device, and a depth imaging device interference filter. The present invention provides a depth imaging device comprising a light transmitter for transmitting a source light and a light receiver for receiving reflected light of the source light, and comprising: a center wavelength monitoring device for measuring a change in the center wavelength of the source light; an interference filter which is arranged on the front end of the light receiver and which includes a first reflective layer and a second reflective layer facing the first reflective layer, wherein the wavelength of light escaping after being incident on the interference filter is adjusted according to the interval between the first reflective layer and the second reflective layer; an interval adjusting mechanism formed so as to be able to adjust the interval between the first reflective layer and the second reflective layer; and a controller for adjusting the interval between the first reflective layer and the second reflective layer by controlling the interval adjusting mechanism in response to a change in the center wavelength of the source light measured by the center wavelength monitoring device.