Biometric capture device comprising: - an optical block integrating an acquisition surface on which a user places, in service, at least one body part having at least one print, - an optical acquisition system configured to acquire at least one image of at least one print of said body part through at least one face of the block, called exit face, the optical acquisition system being arranged such that a first light ray propagating, outside the optical block, along an optical axis of said optical acquisition system forms, on the acquisition surface, an angle β with respect to a normal to the acquisition surface with a value greater than a critical angle depending on the refractive indices of the optical block and of air, the optical acquisition system also being arranged such that the optical axis forms an angle with respect to a normal to the exit face less than said critical angle, - an illumination system configured to allow illumination of the acquisition surface, the illumination system generating a light beam defined by an illumination axis, a second light ray propagating along the illumination axis outside the optical block, then propagates in the optical block so as to form a given incident ray on the acquisition surface, which given incident ray is reflected from the acquisition surface so as thus to define a given reflected ray, characterized in that the illumination system and the optical acquisition system are arranged such that an angle Ω between: - the given reflected ray, if the given reflected ray belongs to a plane defined by the normal to the acquisition surface and the first ray, or the projection of the given reflected ray into said plane if not, and - the first ray is strictly greater than the angle β. - an optical block integrating an acquisition surface on which a user places, in service, at least one body part having at least one print, - an optical acquisition system configured to acquire at least one image of at least one print of said body part through at least one face of the block, called exit face, the optical acquisition system being arranged such that a first light ray propagating, outside the optical block, along an optical axis of said optical acquisition system forms, on the acquisition surface, an angle β with respect to a normal to the acquisition surface with a value greater than a critical angle depending on the refractive indices of the optical block and of air, the optical acquisition system also being arranged such that the optical axis forms an angle with respect to a normal to the exit face less than said critical angle, - an illumination system configured to allow illumination of the acquisition surface, the illumination system generating a light beam defined by an illumination axis, a second light ray propagating along the illumination axis outside the optical block, then propagates in the optical block so as to form a given incident ray on the acquisition surface, which given incident ray is reflected from the acquisition surface so as thus to define a given reflected ray, characterized in that the illumination system and the optical acquisition system are arranged such that an angle Ω between: - the given reflected ray, if the given reflected ray belongs to a plane defined by the normal to the acquisition surface and the first ray, or the projection of the given reflected ray into said plane if not, and - the first ray - the given reflected ray, if the given reflected ray belongs to a plane defined by the normal to the acquisition surface and the first ray, or the projection of the given reflected ray into said plane if not, and - the first ray