Voice coil actuator with integrated LVDT
First Claim
Patent Images
1. A device for focusing a laser comprising:
- a housing;
a voice coil having a longitudinal axis mounted in the housing;
a linear voltage displacement transducer (“
LVDT”
) mounted in the housing and having a longitudinal axis, the LVDT mounted adjacent to the voice with the axis of the LVDT in axial alignment with the longitudinal axis of the voice coil;
an armature assembly centrally disposed in the housing and extending through the voice coil and LVDT, the armature assembly adapted for axial movement in response to energizing the voice coil, and the LVDT providing accurate positioning means for determining the location of the armature assembly;
a lens mounted at one end of an armature assembly;
a hollow bore extending through the armature from one end of the armature to the other;
whereby when a light beam passes through the hollow bore it can be focused by movement of the lens controlled by the voice coil and LVDT.
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Abstract
A device for focusing a laser in which a voice coil and LVDT are mounted in parallel alignment with each other and have a common centrally disposed armature. A central bore extends through the armature. A lens is mounted at one end of the armature and a laser is located at the opposite end. The laser beam passes through the central bore and is focused by the voice coil moving the armature which in turn moves the lens. The LVDT accurately positions the armature to focus the laser beam.
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Citations
12 Claims
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1. A device for focusing a laser comprising:
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a housing; a voice coil having a longitudinal axis mounted in the housing; a linear voltage displacement transducer (“
LVDT”
) mounted in the housing and having a longitudinal axis, the LVDT mounted adjacent to the voice with the axis of the LVDT in axial alignment with the longitudinal axis of the voice coil;an armature assembly centrally disposed in the housing and extending through the voice coil and LVDT, the armature assembly adapted for axial movement in response to energizing the voice coil, and the LVDT providing accurate positioning means for determining the location of the armature assembly; a lens mounted at one end of an armature assembly; a hollow bore extending through the armature from one end of the armature to the other; whereby when a light beam passes through the hollow bore it can be focused by movement of the lens controlled by the voice coil and LVDT. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A combination voice coil and LVDT comprising:
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a housing in which is mounted a voice coil and LVDT, the voice coil and LVDT in axial alignment with each other with one end of the voice coil adjacent to an end of the LVDT; a common armature assembly extending axially through the voice coil and LVDT, the armature assembly adapted for axial movement in response to energizing the voice coil with one end of the armature assembly extending out past the an end of the voice coil; a hollow bore extending through the armature from one end of the armature to the other; the LVDT providing accurate positioning means for determining the location of the armature assembly; a lens mounted on the end of the armature assembly that extends out past the end of the voice coil; whereby when a light beam passes through the hollow bore it can be focused by movement of the lens controlled by the voice coil and LVDT. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification