Stepping-motor driving device and lens driving device using the same

A driving apparatus for a stepping motor using a micro step driving mode, where an exciting current, which is increased and decreased step-by-step, is energized to each phase, comprising:

• a driving control circuit, which causes a drive circuit to perform energization to each phase by selecting one of a predetermined first combination of the energization values to each phase and a predetermined second combination of the energization values to each phase, which has a greater amount of energization compared to an amount of energization of the first combination,
• wherein one of the first combination and the second combination is selected depending upon a number of driving steps of the stepping motor.

A driving apparatus for a stepping motor using a micro step driving mode, where an exciting current, which is increased and decreased step-by-step, is energized to each phase, comprising:

• a drive control circuit, which causes a drive circuit to perform energization to each phase by selecting either a first combination of PWM values energized to each phase or a second combination having a larger whole PWM value compared to the first combination,
• wherein one of the first combination and the second combination is selected depending upon a number of driving steps of the stepping motor.

A driving apparatus for a stepping motor using a micro step driving mode, where an exciting current, which is increased and decreased step-by-step, is energized, comprising:

• a drive control circuit, which sets a number of driving steps of the stepping motor and which causes a drive circuit to perform energization by a predetermined first combination of the energization values,
• wherein said control circuit causes said drive circuit to perform energization by a predetermined second combination of the energization values, which has a greater amount of energization compared to an amount of energization of the first combination when the remaining number of driving steps of the stepping motor is equal to or less than a predetermined value.

A driving apparatus for a stepping motor using a micro step driving mode, where an exciting current, which is increased arid decreased step-by-step, is energized to each phase, comprising:

• a drive control circuit, which sets a number of driving steps of the stepping motor and which causes a drive circuit to perform energization to each phase by a predetermined first combination of the energization values to each phase,
• wherein said control circuit causes said drive circuit to perform energization to each phase by a predetermined second combination of the energization values to each phase, which has a greater amount of energization compared to an amount of energization of the predetermined first combination when the remaining number of driving steps of the stepping motor is equal to or less than a predetermined value.

A driving apparatus for a stepping motor using a micro step driving mode, where an exciting current, which is increased and decreased step-by-step, is energized to each phase, comprising:

• a drive control circuit, which sets a number of driving steps of the stepping motor and which causes a drive circuit to perform energization to each phase by a first combination of PWM values energized to each phase,
• wherein said control circuit causes said drive circuit to perform energization to each phase by a second combination having a larger whole PWM value compared to the first combination when the remaining number of driving steps of the stepping motor is equal to or less than a predetermined value.

A driving method for a stepping motor using a micro step driving mode where an exciting current, which is increased and decreased step-by-step, is energized to each phase, comprising:

• controlling a drive circuit to perform energization to each phase by selecting one of a predetermined first combination of the energization values to each phase and a predetermined second combination of the energization values to each phase, which has a greater amount of energization compared to an amount of energization of the first combination,
• wherein one of the first combination and the second combination is selected depending upon a number of driving steps of the stepping motor.

A driving method for a stepping motor using a micro step driving mode where an exciting current, which is increased and decreased step-by-step, is energized to each phase, comprising:

• controlling a drive circuit to perform energization to each phase by selecting either a first combination of PWM values energized to each phase or a second combination having a larger whole PWM value compared to the first combination,
• wherein one of the first combination and the second combination is selected depending upon a number of driving steps of the stepping motor.

A driving method for a stepping motor using a micro step driving mode, where an exciting current, which is increased and decreased step-by-step, is energized, comprising:

• setting in a drive control circuit a number of driving steps of the stepping motor and controlling a drive circuit to perform energization by a predetermined first combination of the energization values,
• wherein the drive control circuit causes the drive circuit to perform energization by a predetermined second combination of We energization values, which has a greater amount of energization compared to an amount of energization of the first combination when the remaining number of driving steps of die stepping motor is equal to or less than a predetermined value.

A driving method for a stepping motor using a micro step driving mode, where an exciting current, which is increased and decreased step-by-step, is energized to each phase, comprising:

• setting in a drive control circuit, a number of driving steps of the stepping motor and controlling a drive circuit to perform energization to each phase by a predetermined first combination of the energization values to each phase,
• wherein the drive control circuit causes the drive circuit to perform energization to each phase by a predetermined second combination of the energization values to each phase, which has a greater amount of energization compared to an amount of energization of the predetermined first combination when die remaining number of driving steps of the stepping motor is equal to or less than a predetermined value.