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US 6,282,380 B1Granted
Position control apparatus, focus adjustment apparatus and camera
AssigneeCanon Kabushiki Kaisha
InventorHarushige Yamamoto
Life of this patent
Estimating the term…
Abstract
A position control apparatus includes a stepping motor, a lead screw arranged to be rotated by the stepping motor being driven, a moving member arranged to move according to rotation of the lead screw, a first detecting device which detects that the moving member passes a particular position, a second detecting device which detects that the lead screw passes a particular rotating position, and a determination device which determines an amount of deviation of the moving member from a reference position on the basis of outputs from the first detecting device and the second detecting device.
Claims30
A position control apparatus comprising:
- a) a stepping motor;
- b) a lead screw arranged to be rotated by said stepping motor being driven;
- c) a moving member arranged to move according to rotation of said lead screw;
- d) a first detecting device which detects that said moving member passes a particular position;
- e) a second detecting device which detects that said lead screw passes a particular rotating position;
- and
- f) a determination device which determines an amount of deviation of said moving member from a reference position on the basis of outputs from said first detecting device and said second detecting device.
4 more elements
A position control apparatus comprising:
- a) a stepping motor;
- b) a lead screw arranged to be rotated by said stepping motor being driven;
- c) a moving member arranged to move according to rotation of said lead screw;
- d) a first detecting device which detects a position of said moving member;
- e) a second detecting device which detects a rotating position of said lead screw;
- and
- f) a determination device which determines an amount of deviation of said moving member from a reference position on the basis of outputs from said first detecting device and said second detecting device.
4 more elements
A focus adjustment apparatus comprising:
- a) a stepping motor;
- b) a lead screw arranged to be rotated by said stepping motor being driven;
- c) a lens holding member arranged to hold a lens for focus adjustment and to move according to rotation of said lead screw;
- d) a first detecting device which detects that said lens holding member passes a particular position;
- e) a second detecting device which detects that said lead screw passes a particular rotating position;
- and
- f) a determination device which determines an amount of deviation of said lens holding member from a reference position on the basis of outputs from said first detecting device and said second detecting device.
4 more elements
A focus adjustment apparatus comprising:
- a) a stepping motor;
- b) a lead screw arranged to be rotated by said stepping motor being driven;
- c) a lens holding member arranged to hold a lens for focus adjustment and to move according to rotation of said lead screw;
- d) a first detecting device which detects a position of said lens holding member;
- e) a second detecting device which detects a position of said lead screw;
- and
- f) a determination device which determines an amount of deviation of said lens holding member from a reference position on the basis of outputs from said first detecting device and said second detecting device.
4 more elements
A camera comprising:
- a) a stepping motor;
- b) a lead screw arranged to be rotated by said stepping motor being driven;
- c) a lens holding member arranged to hold a lens for focus adjustment and to move according to rotation of said lead screw;
- d) a first detecting device which detects that said lens holding member passes a particular position;
- e) a second detecting device which detects that said lead screw passes a particular rotating position;
- and
- f) a determination device which determines an amount of deviation of said lens holding member from a reference position on the basis of outputs from said first detecting device and said second detecting device.
4 more elements
A camera comprising:
- a) a stepping motor;
- b) a lead screw arranged to be rotated by said stepping motor being driven;
- c) a lens holding member arranged to hold a lens for focus adjustment and to move according to rotation of said lead screw;
- d) a first detecting device which detects a position of said lens holding member;
- e) a second detecting device which detects a position of said lead screw;
- and
- f) a determination device which determines an amount of deviation of said lens holding member from a reference position on the basis of outputs from said first detecting device and said second detecting device.
4 more elements
Dependencies are inferred from the claim text.