WE CLAIM:
[Claim 1]
An elevator car position detection sensor comprising:
a first coil provided to one of an elevator car and a hoistway and configured to output an excitation magnetic field to a plate provided to the other of the elevator car and
the hoistway;
a second coil provided on an opposite side of the first coil relative to the plate;
a shield wall configured to shield an end portion of the plate located closer to one of the car and the hoistway; and
a determination circuit configured to determine a phase of an alternating-current voltage corresponding to a frequency of the excitation magnetic field output from the first coil at an alternating-current voltage generated across the second coil.
[Claim 2]
The elevator car position detection sensor according to Claim 1, wherein the shield wall shields an end portion of the plate located closer to one of the car and the hoistway at a side closer to the first coil, at a side closer to a tip end of the plate, and at a side closer to the second coil. [Claim 3]
The elevator car position detection sensor according to Claim 1, wherein the shield wall shields an end portion of the plate located closer to one of the car and the hoistway at a side closer to the first coil and at a side closer to a tip end of the plate, without shielding the end portion of the plate at a side closer to the second coil. [Claim 4]

The elevator car position detection sensor according to Claim 1, wherein the shield wall shields an end portion of the plate located closer to one of the car and the hoistway at a side closer to a tip end of the plate and at a side closer to second coil, without shielding the end portion of the plate at a side closer to the first coil. [Claim 5]
The elevator car position detection sensor according to Claim 1, wherein the shield wall shields an end portion of the plate located closer to one of the car and the hoistway at a side closer to a tip end of the plate, without shielding the end portion of the plate at a side closer to the first coil and at a side closer to the second coil. [Claim 6]
The elevator car position detection sensor according to any one of Claims 1 to 5, further comprising:
a first yoke provided on an inside of the first coil; and
a second yoke provided on an inside of the second coil. [Claim 7]
The elevator car position detection sensor according to any one of Claims 1 to 6, wherein the determination circuit determines a phase and an amplitude of the alternating-current voltage generated across the second coil.