Abstract: The present invention is directed to a light transmitting lens for transmitting substantially all of the light emitted by a light source, such as a light emitting diode. The light transmitting lens includes a light transmitting structure having an outer surface disposed between first and second sides. Located on the first side is a tubular concave surface, preferably terminated by a hemispherical convex lens. Located on the second side is an opening, preferably a spherical surface. Located within the opening, preferably at the center of the spherical surface, is the light source, preferably a light emitting diode. Some of the light emitted by the light source is captured by the convex lens and transmitted thereby. The light emitted by the light source but not captured by the convex lens is reflected off the outer surface of the structure and thereby transmitted.

Abstract: A photoelectric sensor comprises a thin plate-shaped optical body, a circuit block and a tubular casing for incorporating therein the optical body and the circuit block. A signal light incoming through a transparent protector of the casing is reflected upon a first reflective mirror of the optical body. Following this first reflection, a second reflection is made upon a second reflective mirror thereof. The light having passed through a light collecting lens is received by a photoelectric converting element and converted into electric signals for output. Since the optical body comprises a plurality of reflective surfaces, an optical path up to the photoelectric converting element can be incorporated compactly within the thin plate-shaped optical body.