Optical device, light-source device, detector, and electronic device

A light-source device comprising:

• an optical device including
• a first substrate having a first plane and a plurality of elements, the plurality of elements being disposed on the first substrate to emit or receive light in a direction intersecting with the first plane, and
• a second substrate having a second face that faces the first plane, the second substrate being provided with a plurality of lenses disposed to correspond to the plurality of elements, the second substrate extending in a first direction parallel to the second face to contact the first plane, the second substrate having a joint used to determine spacing between the first substrate and the second substrate, the joint contacting the first substrate with an area smaller than a maximum size of cross-sectional area parallel to the second face of the joint;
• and
• a driver configured to drive the optical device,
• wherein each one of the plurality of elements is an element to emit light.