Coordinate computation device and sewing machine

摘要

A coordinate computation device includes a position indication portion, a detection portion, a processor, and a memory. The position indication portion includes an indicating portion, a switch, and a transmitter. The detection portion is configured to detect ultrasonic waves transmitted by the transmitter. The memory is configured to store computer-readable instructions. The computer-readable instructions cause the processor to perform processes that include computing sets of first coordinates, based on times when the detection portion detects the ultrasonic waves, computing a movement direction of the position indication portion on a plane, computing an angle formed between the plane and a direction in which the position indication portion is long, and computing a set of second coordinates, based on the computed movement direction, the computed angle, and a set of third coordinates among the sets of the computed first coordinates.

主权项

1. A coordinate computation device comprising:
a position indication portion that includes an indicating portion, a switch, and a transmitter, the indicating portion being configured to indicate a position on a plane, the transmitter being configured to transmit ultrasonic waves, and the position indication portion being long in a direction of a virtual straight line that passes through the indicating portion and the transmitter; a detection portion that is configured to detect the ultrasonic waves that are transmitted by the transmitter; a processor; and a memory that is configured to store computer-readable instructions, wherein the computer-readable instructions cause the processor to perform processes comprising:
computing sets of first coordinates, based on times when the detection portion detects the ultrasonic waves, the sets of the first coordinates respectively indicating positions on the plane that respectively correspond to positions of the transmitter at a time when the switch is turned on and at times before and after the switch is turned on;computing a movement direction of the position indication portion on the plane, based on at least one part of the sets of the computed first coordinates;computing an angle that is formed between the plane and the direction in which the position indication portion is long, based on at least one part of the sets of the computed first coordinates; andcomputing a set of second coordinates, based on the computed movement direction, the computed angle, and a set of third coordinates among the sets of the computed first coordinates, the set of the second coordinates indicating an indicated point on the plane, the indicated point being the position that is indicated by the indicating portion, and the set of the third coordinates indicating a position on the plane that corresponds to the position of the transmitter at the time when the switch is turned on.