Patent ID: 8570148

Claim:
A biological information acquiring apparatus that acquires biological information of a living body by irradiating a light onto the body, the biological information acquiring apparatus comprising: light source units configured to irradiate light onto the body; a light receiving unit including a light receiving element, the light receiving element including pixels, each of the pixels receiving at least one of a transmission light and a reflection light by irradiating the light from the light source units onto the body, the transmission light transmitting through the body, the reflection light reflected from the body; and a nonuniform filter disposed on the light receiving unit and on a light path of at least one of the transmission light and the reflection light, the nonuniform filter having a light transmittance that varies with area of the nonuniform filter, and wherein the light source units are disposed around the light receiving unit discretely and the light transmittance of the nonuniform filter is set so that a light intensity of at least one of the transmission light and the reflection light is uniform over an entire surface of the light receiving element, each of the light source units includes LEDs, and the number of the light source units is determined based on a difference of the light intensity between a first area of the light receiving unit and a second area of the light receiving unit in comparison with a threshold value of the difference of the light intensity, the light intensity in the first area is smallest in the light receiving unit, the light intensity in the second area is largest in the light receiving unit, and the light intensity is calculated based on a temporarily defined number of light source units, an area of the light receiving unit, coordinates of the LED when a center of the light receiving unit is defined as an origin, a reduced scattering coefficient of the living body, an absorption coefficient of the body, and a formula for computation of a light intensity distribution of a diffusively reflected light.