Patent ID: 9057683
Filing Date: 2015-06-16
Classification: B60R,B60S,G01N,G01W,G06K,H04N

Abstract:
1. An image pickup unit comprising: a light source that emits light toward a transparent member from a side of one surface of the transparent member; an image pickup lens having a focal length that is set far from a position of the transparent member; an image sensor that includes plural pixels arranged two-dimensionally; and an image pickup device that is put on the side of the transparent member the same as that of the light source, wherein the image pickup device takes an image of reflected light that includes regular reflection of the emitted light reflected by an interface between an adhered object that adheres to the other surface of the transparent member and air by using the image sensor, and the light source is put in a position such that in a case where an incident angle of the emitted light on the transparent member when the light reflected in a regular reflection manner by the other surface of the transparent member is incident on the image pickup lens is θs, an incident angle of a typical light beam of the emitted light on the transparent member falls within a range θs−30 deg through θs and an incident angle of a main element of the emitted light on the transparent member is less than θs.