Optical sensor module including an interferometric sensor and extended depth of focus optics

A hand-held input device, comprising:

• an elongate housing having a surface contact end;
• a set of one or more interferometric sensors mounted to the elongate housing, an interferometric sensor in the set of one or more interferometric sensors including,
• a light source configured to generate and emit a beam of light;
• and
• at least one detector configured to generate an interferometric signal in a set of one or more interferometric signals, the interferometric signal based on an at least partially coherent mixing of light that is generated and received by the interferometric sensor;
• a set of one or more optical elements including a zone plate, the zone plate configured to, for the interferometric sensor and simultaneously,
• direct a first portion of the emitted beam of light toward a first focus area within a first depth of focus near the surface contact end of the elongate housing;
• direct a second portion of the emitted beam of light toward a second focus area within a second depth of focus near the surface contact end of the elongate housing;
• and
• direct portions of the emitted beam of light returned from a surface toward the interferometric sensor;
• the zone plate having,
• a first zone that directs the first portion of the emitted beam of light toward the first focus area;
• and
• a second zone, different from the first zone, that directs the second portion of the emitted beam of light toward the second focus area;
• and
• a processor mounted within the elongate housing and configured to identify an input provided by a user on a surface contacted by the surface contact end of the elongate housing, the input identified at least in part based on the set of one or more interferometric signals generated by the set of one or more interferometric sensors.

A wearable device, comprising:

• a wearable housing;
• a set of one or more interferometric sensors mounted to the wearable housing, an interferometric sensor in the set of one or more interferometric sensors including,
• a light source configured to generate and emit a beam of light from the wearable housing;
• and
• at least one detector configured to generate an interferometric signal in a set of one or more interferometric signals, the interferometric signal based on at least partially coherent mixing of light that is generated and received by the interferometric sensor;
• and
• a set of one or more optical elements including a zone plate, the zone plate configured to, for the interferometric sensor and simultaneously,
• direct a first portion of the emitted beam of light toward a first focus area within a first depth of focus;
• direct a second portion of the emitted beam of light toward a second focus area within a second depth of focus;
• and
• direct portions of the emitted beam of light returned from one or more objects, in the first depth of focus or the second depth of focus, toward the interferometric sensor;
• the zone plate having,
• a first zone that directs the first portion of the emitted beam of light toward the first focus area;
• and
• a second zone, different from the first zone, that directs the second portion of the emitted beam of light toward the second focus area.

An optical sensor module, comprising:

• an interferometric sensor including,
• a light source configured to generate and emit a beam of light;
• and
• at least one detector configured to generate an interferometric signal, the interferometric signal based on an at least partially coherent mixing of light that is generated and received by the interferometric sensor;
• and
• a set of one or more optical elements including a zone plate, the zone plate configured to simultaneously,
• direct a first portion of the beam of light emitted by the light source toward a first focus area within a first depth of focus;
• direct a second portion of the beam of light emitted by the light source toward a second focus area within a second depth of focus;
• and
• direct portions of the emitted beam of light that are returned from one or more objects within the first depth of focus or the second depth of focus toward the interferometric sensor;
• the zone plate having,
• a first set of zones that directs the first portion of the emitted beam of light toward the first focus area;
• and
• at least a second zone, different from the zones in the first set of zones, that directs the second portion of the emitted beam of light toward the second focus area.