Patent ID: 8144938
Filing Date: 2012-03-27
Classification: A61B

Abstract:
1. A biological information acquisition device that acquires information from a biological body by irradiating the biological body with light, the device comprising: a light source irradiating the biological body with light; a light receiver including a plurality of light receiving elements that are arranged in two dimensions, the plurality of light receiving elements receiving one of passed light and reflected light from the biological body irradiated with light by the light source; and an inhomogeneous neutral density filter disposed on the plurality of light receiving elements and on a light path of one of the passed light and the reflected light, wherein an optical transmittance of the inhomogeneous neutral density filter is set so that a plurality of intensities of each light component received by light receiving elements are evened out as a whole, wherein the light source is disposed around a perimeter of the light receiver.