Distance measurement device, distance measurement control method, and distance measurement control program

A distance measurement control method for a distance measurement device including a light receiving section that receives reflective light from a subject as a subject image through an image formation optical system, an emission unit that has a light emitting element emitting directional light which is light having directivity, and emits the directional light toward the subject, a detection unit that detects variation exerted on the device, an optical path forming unit that forms a common optical path on which an optical axis of the image formation optical system coincides with an optical axis of the directional light, a reflective light optical path which branches off from the common optical path and guides the reflective light to the light receiving section, and a directional light optical path which joins the common optical path and guides the directional light to the common optical path, a common reduction unit that is disposed on the common optical path, reduces, based on a detection result of the detection unit, influence of variation of the optical axis of the image formation optical system on the subject image received as light by the light receiving section, and reduces variation of the optical axis of the directional light with respect to the subject based on the detection result of the detection unit, and an auxiliary reduction unit that auxiliarily reduces at least one of influence of variation of the optical axis of the image formation optical system on the subject image received as light by the light receiving section or variation of the optical axis of the directional light with respect to the subject, the method comprising:

• in a case of operating the common reduction unit and the auxiliary reduction unit included in the distance measurement device at the same time, controlling the common reduction unit and the auxiliary reduction unit to reduce variation of an irradiation position of the directional light in the subject image received as light by the light receiving section.

A non-transitory computer readable medium storing a program that causes a computer to execute a process to control a distance measurement device,

• the distance measurement device including a light receiving section that receives reflective light from a subject as a subject image through an image formation optical system, an emission unit that has a light emitting element emitting directional light which is light having directivity, and emits the directional light toward the subject, a detection unit that detects variation exerted on the device, an optical path forming unit that forms a common optical path on which an optical axis of the image formation optical system coincides with an optical axis of the directional light, a reflective light optical path which branches off from the common optical path and guides the reflective light to the light receiving section, and a directional light optical path which joins the common optical path and guides the directional light to the common optical path, a common reduction unit that is disposed on the common optical path, reduces, based on a detection result of the detection unit, influence of variation of the optical axis of the image formation optical system on the subject image received as light by the light receiving section, and reduces variation of the optical axis of the directional light with respect to the subject based on the detection result of the detection unit, and an auxiliary reduction unit that auxiliarily reduces at least one of influence of variation of the optical axis of the image formation optical system on the subject image received as light by the light receiving section or variation of the optical axis of the directional light with respect to the subject,
• the process comprising:
• in a case of operating the common reduction unit and the auxiliary reduction unit included in the distance measurement device at the same time, controlling the common reduction unit and the auxiliary reduction unit to reduce variation of an irradiation position of the directional light in the subject image received as light by the light receiving section.