Position detecting signal generator

Apparatus for generating a phase signal corresponding to a reference phase of a movable body relative to a stationary body, comprising:

• position signal generating means associated with at least one of said movable body and said stationary body for generating a position signal corresponding to the position of said movable body relative to said stationary body;
• speed signal generating means associated with at least one of said movable body and said stationary body for generating a speed signal corresponding to the speed of movement of said movable body relative to said stationary body, said speed signal generating means including a speed signal generating medium mounted on one of said movable body and said stationary body and having a plurality of spaced light reflecting portions, and speed signal detecting means mounted on the other of said movable body and said stationary body and associated with said speed signal generating medium for generating an output signal corresponding to the speed of movement of said movable body relative to said stationary body, said speed signal detecting means including optical detecting means for producing said output signal in response to relative movement between said spaced light reflecting portions and said optical detecting means;
• differentiating means for differentiating one of said position signal and said speed signal to produce a differentiated signal;
• and
• phase signal generating means for generating said phase signal corresponding to a reference phase of said movable body relative to said stationary body in response to said differentiated signal and the other of said position signal and said speed signal.

Apparatus for generating a phase signal corresponding to reference phase of a movable body relative to a stationary body, comprising:

• position signal generating means associated with at least one of said movable body and said stationary body for generating a position signal corresponding to the position of said movable body relative to said stationary body;
• speed signal generating means associated with at least one of said movable body and said stationary body for generating a speed signal comprised of a plurality of successive speed pulses and corresponding to the speed of movement of said movable body relative to said stationary body said speed signal generating means including a speed signal generating medium mounted on one of said movable body and said stationary body, speed signal detecting means mounted on the other of said movable body and said stationary body and associated with said speed signal generating medium for generating an output signal corresponding to the speed of movement of said movable body relative to said stationary body, operational amplifier means having an input supplied with said output signal and an output for generating said speed signal in response to said output signal from said speed signal detecting means, and offset means for changing the duty cycle of said plurality of successive speed pulses of said speed signal;
• differentiating means for differentiating one of said position signal and said speed signal to produce a differentiated signal;
• and
• phase signal generating means for generating said phase signal corresponding to a reference phase of said movable body relative to said stationary body in response to said differentiated signal and the other of said position signal and said speed signal.

Apparatus for generating a phase signal corresponding to a reference phase of a movable body relative to a stationary body, comprising:

• position signal generating means associated with at least one of said movable body and said stationary body for generating a position signal corresponding to the position of said movable body relative to said stationary body;
• speed signal generating means associated with at least one of said movable body and said stationary body for generating a speed signal corresponding to the speed of movement of said movable body relative to said stationary body, in which one of said position signal and said speed signal has a period greater than the period of the other of said position signal and said speed signal;
• differentiating means for differentiating one of said position signal and said speed signal to produce a differentiated signal;
• and
• phase signal generating means for generating said phase signal corresponding to a reference phase of said movable body relative to said stationary body in response to said differentiated signal and the other of said position signal and said speed signal.

Apparatus for generating a phase signal corresponding to a reference phase of a movable body relative to a stationary body, comprising:

• position signal generating means associated with at least one of said movable body and said stationary body for generating a position signal corresponding to the position of said movable body relative to said stationary body;
• speed signal generating means associated with at least one of said movable body and said stationary body for generating a speed signal corresponding to the speed of movement of said movable body relative to said stationary body;
• differentiating means for differentiating one of said position signal and said speed signal to produce a differentiated signal;
• and
• phase signal generating means for generating said phase signal corresponding to a reference phase of said movable body relative to said stationary body in response to said differentiated signal and the other of said position signal and said speed signal, said phase signal generating means including logical product means for generating said phase signal in response to the logical product of the differentiated signal and the other of said position signal and said speed signal.