Optical measuring device with positional displacement detection

An optical measuring device comprising:

• a light projecting unit configured to project light into a measurement space in which a measurement object is to be placed, the light being projected in parallel to a first direction;
• a first light receiving unit and a second light receiving unit each configured to output a signal indicating a received light amount;
• a first optical system having a first focus within the measurement space, and configured to direct the light projected from the light projecting unit and passing through the measurement space toward the first light receiving unit;
• a second optical system having a second focus within the measurement space, and configured to direct the light projected from the light projecting unit and passing through the measurement space toward the second light receiving unit, the second focus being at a position different from a position of the first focus in the first direction;
• and
• a control unit configured to calculate a position of the measurement object in a second direction based on the signal outputted from the first light receiving unit, the second direction intersecting the first direction, wherein
• the control unit determines whether the measurement object is in a first state, a second state, or a third state based on the signals outputted from the first light receiving unit and the second light receiving unit, the first state being a state in which the measurement object is positioned on a side closer to the light projecting unit with respect to the first focus in the first direction, the second state being a state in which the measurement object is positioned on a side away from the light projecting unit with respect to the first focus, the third state being a state in which the measurement object is positioned at the first focus.