Light emitting module and light receiving module

A light emitting module comprising a light source and a lens element for changing a light from the light source so as to have a predetermined direction, the lens element comprising:

• a plurality of first refraction surfaces, located on an emission surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract the light which is emitted from the light source at an emission angle θ, ranging from zero to θ0, so as to emit the light at a predetermined angle,
• a refraction section operable to refract, to the emission surface of the lens element, the light emitted from the light source at an emission angle θ, larger than θ0,
• a plurality of second refraction surfaces, provided on the emission surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract the light refracted by the refraction section, so as to emit the light at a predetermined angle,
• a reflector for directing, to the refraction section, light emitted from the light source at an emission angle θ larger than θ0, wherein
• θ represents an angle between the optical axis and a direction in which the light is emitted from the light source, and wherein
• the refraction section is a plurality of refraction surfaces provided on an incident surface of the lens element so as to form concentric circles having the optical axis at the center thereof, and having diameters different from each other, and
• the plurality of refraction surfaces interact with the plurality of second refraction surfaces in a substantially one-to-one corresponding manner.

A light emitting module comprising a light source and a lens element for changing a light from the light source so as to have a predetermined direction, the lens element comprising:

• a plurality of first refraction surfaces, located on an emission surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract the light which is emitted from the light source at an emission angle θ, ranging from zero to θ0, so as to emit the light at a predetermined angle,
• a light direction section operable to direct, to the emission surface of the lens element, the light emitted from the light source at an emission angle θ, larger than θ0, and
• a plurality of second refraction surfaces, provided on the emission surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract the light directed by the light direction section, so as to emit the light at a predetermined angle, wherein
• θ represents an angle between the optical axis and a direction in which the light is emitted from the light source,
• the plurality of second refraction surfaces and the plurality of first refraction surfaces are alternately provided on the emission surface of the lens element, and
• the plurality of second refraction surfaces have such a shape as to remove, from the emission surface of the lens element, an invalid portion for preventing emission of an emission light emitted by the light source.

A light receiving module comprising a light receiving element and a lens element for collecting a light on the light receiving element, the lens element comprising:

• a plurality of first refraction surfaces, located on an incident surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract a first incident light so as to collect the first incident light on the light receiving element,
• a plurality of second refraction surfaces, located on the incident surface of the lens element so as to form concentric circles of different diameters with each concentric circle having an optical axis at the center of the lens element, operable to refract a second incident light, and
• a light direction section, located at a position to collect on the light receiving element, the second incident light refracted from the plurality of second refraction surfaces, wherein
• the light direction section does not interfere with the first incident light refracted by the plurality of first refraction surfaces, and
• the plurality of second refraction surfaces and the plurality of first refraction surfaces are alternately positioned on the incident surface of the lens element.