Method of conveying product, product conveyance apparatus, method of producing optical element, optical element production apparatus, and non-transitory computer-readable medium

A product conveyance apparatus comprising:

• an actuator configured to hold a product;
• a movement portion configured to move the actuator;
• a first position detection portion configured to detect a position of the actuator;
• a second position detection portion configured to detect a position of the product held by the actuator;
• and
• a controller configured to control the actuator, the movement portion, the first position detection portion, and the second position detection portion,
• wherein the controller is configured to perform
• a process of causing the actuator not holding the product to move to a predetermined position, detecting the position of the actuator by the first position detection portion, and storing the position detected by the first position detection portion as a first position,
• a process of causing the actuator to move on a basis of a movement instruction value that is stored in advance and hold the product, causing the actuator holding the product to move to the predetermined position, detecting the position of the product held by the actuator by the second position detection portion, and storing the position detected by the second position detection portion as a second position, and
• a process of correcting and updating the movement instruction value on a basis of difference between the first position and the second position.

An optical element production apparatus comprising:

• an actuator configured to hold an optical blank;
• a movement portion configured to move the actuator;
• a camera;
• a shaping portion configured to subject the optical blank to a shaping process;
• and
• a controller configured to control the actuator, the movement portion, the camera, and the shaping portion,
• wherein the controller performs
• a process of causing the actuator not holding the optical blank to move to a predetermined image capturing position, causing the camera to capture an image of the actuator, and storing a position of the actuator as a first position on a basis of the captured image of the actuator,
• a process of causing the actuator to move on a basis of a movement instruction value that is stored in advance and hold the optical blank, causing the actuator holding the optical blank to move to the predetermined image capturing position, causing the camera to capture an image of the optical blank held by the actuator, and storing a position of the optical blank as a second position on a basis of the captured image of the optical blank, and
• a process of correcting and updating the movement instruction value on a basis of difference between the first position and the second position, and causing the actuator to move on a basis of the updated movement instruction value, hold the optical blank, and convey the held optical blank to the shaping portion.