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US 4,560,263 AGranted
Drive system for a vibration wave motor for lens control
AssigneeCanon Kabushiki Kaisha
InventorsMakoto Katsuma, Hiroyasu Murakami, Akira Hiramatsu
Life of this patent
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Abstract
In a drive system for a vibration wave motor for generating a travelling vibration wave by friction-contacting a vibration member to a movable member and by electro-mechanical energy conversion means contained in one of the vibration member and the movable member to friction-drive the movable member, a standing vibration wave is generated by the electro-mechanical energy conversion means prior to the start.
Claims23
A drive system for a vibration wave motor comprising:
- a pair of electrostrictive element groups arranged or polarized phase-differentially, said electrostrictive element groups each including at least one electrostrictive element;
- a vibration member for generating a travelling vibration wave when phase-differential voltages are applied to said pair of electrostrictive element groups;
- a movable member press-contacted to said vibration member to be friction-driven thereby;
- first means for converting a DC voltage to a pulse signal for application to one of said pair of electrostrictive element groups;
- second means for converting a DC voltage to a pulse signal for application to the other of said pair of electrostrictive element groups, said pulse signal of said second means having a phase difference from said pulse signal of said first means;
- and
- enabling means for enabling one or both of said first and second means, said enabling means including switching means to switch from the state in which one of said first and second means are enabled to the state in which both of said first and second means are enabled.
4 more elements
A vibration wave motor comprising:
- a vibration member;
- a movable member contacted to said vibration member to be friction-driven thereby;
- electro-mechanical energy conversion means capable of generating a travelling vibration wave and a standing vibration wave in said vibration member;
- first means for causing said conversion means to generate the standing vibration wave;
- second means for causing said conversion means to generate the travelling vibration wave;
- and
- switching means for enabling one or the other of said first and second means.
4 more elements
A lens drive unit having a vibration wave motor comprising:
- a pair of electrostrictive element groups arranged or polarized phase-differentially, said electrostrictive element groups each including at least one electrostrictive element;
- a vibration member for generating a travelling vibration wave when phase-differential voltages are applied to said pair of electrostrictive element groups;
- a movable member press-contacted to said vibration member to be friction-driven thereby, said movable member driving a lens;
- first means for converting a DC voltage to a pulse signal for application to one of said pair of electrostrictive element groups;
- second means for converting a DC voltage to a pulse signal for application to the other of said pair of electrostrictive element groups, said pulse signal of said second means having a phase difference from said pulse signal of said first means;
- and
- enabling means for enabling one or both of said first and second means, said enabling means including switching means to select a first state in which one of said first and second means are enabled or a second state in which both of said first and second means are enabled, said switching means selects said second state in an automatic lens drive mode and selects said first state in a manual lens drive mode.
4 more elements
A lens drive unit having a vibration wave motor comprising:
- a pair of electrostrictive element groups arranged or polarized phase-differentially, said electrostrictive element groups each including at least one electrostrictive element;
- a vibration member for generating a travelling vibration wave when phase-differential voltages are applied to said pair of electrostrictive element groups;
- a movable member press-contacted to said vibration member to be friction-driven thereby, said movable member driving a lens;
- first means for converting a DC voltage to a pulse signal for application to one of said pair of electrostrictive element groups;
- second means for converting a DC voltage to a pulse signal for application to the other of said pair of electrostrictive element groups, said pulse signal of said second means having a phase difference from said pulse signal of said first means;
- switching means for applying the DC voltage to said first means and said second means;
- signal generating means for generating a lens drive start signal;
- and
- enabling means for enabling one or both of said first and second means, said enabling means enabling one of said first and second means in response to the actuation of said switching means and enabling both of said first and second means in response to said lens drive start signal from said signal generating means.
6 more elements
A system of a vibration wave motor comprising:
- (a) vibration means comprising electro-mechanical energy conversion elements for generating a traveling wave or a standing wave by the vibration generated in said elements;
- (b) a driven member contacting said vibration means and friction-driven by said vibration member, the position of said driven member being relatively changed with respect to that of said vibration means;
- (c) applying means for applying a periodic signal to said electro-mechanical energy conversion elements, said applying means having a first state in which said applying means causes said vibration means to generate the traveling wave, and a second state in which said applying means causes said vibration member to generate the standing wave;
- and
- (d) switch-over means for switching over between said first state and said second state.
2 more elements
A lens drive apparatus having a vibration motor comprising:
- (a) a vibration member comprising electro-mechanical energy conversion elements for generating a traveling wave or a standing wave according to the vibration generated in said elements;
- (b) a driven member contacting said vibration member and friction-driven by said vibration member, the position of said vibration member being relatively changed with respect to that of said vibration member;
- and
- (c) switching-over means for switching over between a manual mode in which the standing wave is generated in said vibration member so that a photo-taking lens is driven by manual operation, and an auto mode in which the traveling wave is generated in said vibration member so that the photo-taking lens is driven by said traveling wave.
1 more element
A system comprising:
- (a) vibration means including electro-mechanical conversion elements, for generating a wave by the vibration generated in said elements;
- (b) a driven member contacting said vibration means, said member being supported such that the relative position of said member to that of said vibration is changed;
- (c) applying means for applying a periodic signal to said electro-mechanical energy conversion elements, said applying means having a first state in which said wave to be generated in said vibration means is generated so as to cause said wave to change the relative position, and a second state in which said wave to be generated in said vibration means is generated so as to cause said wave not to change the position of said drive member;
- and
- (d) operating means for operating either said first or second state of said applying means.
2 more elements
A lens drive apparatus comprising:
- (a) a vibration member including electro-mechanical energy conversion elements for generating a wave by the vibration generated in said elements;
- (b) a driven member contacted with said vibration member, the relative position of said driven member to that of said vibration wave being changed;
- (c) control means for applying a periodic signal to said electro-mechanical energy conversion elements, said control means having a first state in which said wave is generated so as to cause said wave to change said relative position, and a second state in which said wave is generated so as to cause said wave not to change said relative position;
- and
- (d) means for operating either said first or second state of said control means.
2 more elements
Dependencies are inferred from the claim text.