Driving apparatus that drives driven body using lead screw, and image pickup apparatus equipped with this driving apparatus
First Claim
1. A driving apparatus comprising:
- a driving source;
a lead screw that has a lead groove that is formed over at least a first member and a second member and has a first surface and a second surface that face to each other in a width direction, said lead screw being rotationally driven by said driving source;
a moving member that engages with the lead groove of said lead screw, and moves approximately parallel to said lead screw according to rotation of said lead screw;
a driven body that is displaced between a first position and a second position according to movement of said moving member; and
a first energization member that energizes said moving member to a side of the second surface at least when said moving member passes across a first junction that occurs at a boundary between the first member and the second member in a stroke where said moving member contacts with a drive surface of the first surface of the lead groove and moves in a direction from a first end to a second end of the lead groove,wherein there is a period during which said first energization member does not generate the energization force to said moving member in the stroke where said moving member moves in the direction from the first end to the second end of the lead groove until said moving member reaches the second end after said moving member finishes passing across the first junction.
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Accused Products
Abstract
A driving apparatus reduces degradation of driving performance and durability when a driven body is displaced using a lead screw. The lead screw has a lead groove that is formed over first and second members and has first and second surfaces that face to each other in a width direction. The lead screw is rotated by a driving source. A moving member engages with the lead groove, and moves parallel to the lead screw according to rotation of the lead screw. A driven body is displaced between first and second positions according to movement of the moving member. A first energization member energizes the moving member toward the second surface when the moving member passes across a first junction that occurs at a boundary between the first and second members in a stroke where the moving member contacts with a drive surface of the first surface to be moved.
10 Citations
16 Claims
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1. A driving apparatus comprising:
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a driving source; a lead screw that has a lead groove that is formed over at least a first member and a second member and has a first surface and a second surface that face to each other in a width direction, said lead screw being rotationally driven by said driving source; a moving member that engages with the lead groove of said lead screw, and moves approximately parallel to said lead screw according to rotation of said lead screw; a driven body that is displaced between a first position and a second position according to movement of said moving member; and a first energization member that energizes said moving member to a side of the second surface at least when said moving member passes across a first junction that occurs at a boundary between the first member and the second member in a stroke where said moving member contacts with a drive surface of the first surface of the lead groove and moves in a direction from a first end to a second end of the lead groove, wherein there is a period during which said first energization member does not generate the energization force to said moving member in the stroke where said moving member moves in the direction from the first end to the second end of the lead groove until said moving member reaches the second end after said moving member finishes passing across the first junction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An image pickup apparatus comprising:
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a driving apparatus comprising; a driving source; a lead screw that has a lead groove that is formed over at least a first member and a second member and has a first surface and a second surface that face to each other in a width direction, said lead screw being rotationally driven by said driving source; a moving member that engages with the lead groove of said lead screw, and moves approximately parallel to said lead screw according to rotation of said lead screw; a driven body that is displaced between a first position and a second position according to movement of said moving member; and a first energization member that energizes said moving member to a side of the second surface at least when said moving member passes across a first junction that occurs at a boundary between the first member and the second member in a stroke where said moving member contacts with a drive surface of the first surface of the lead groove and moves in a direction from a first end to a second end of the lead groove, wherein there is a period during which said first energization member does not generate the energization force to said moving member in the stroke where said moving member moves in the direction from the first end to the second end of the lead groove until said moving member reaches the second end after said moving member finishes passing across the first junction.
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Specification