Anti-shake apparatus
View Patent ↗An anti-shake apparatus of a photographing apparatus comprises a photometric switch for a photometric operation, a release switch for a photographing operation, and a controller. The controller performs the photographing operation without an anti-shake operation when the release switch is set to the ON state and when it is determined that either a first elapsed time from the point when the main power supply is set to the ON state is not greater than a first time, or a second elapsed time from the point when the photometric switch is set to the ON state for the photometric operation is not greater than a second time.
1. An anti-shake apparatus of a photographing apparatus, comprising:
a photometric switch that is manipulated to perform a photometric operation;
a release switch that is manipulated to perform a photographing operation;
a controller that performs said photographing operation without an anti-shake operation when said release switch is set to an ON state and when it is determined that either a first elapsed time from a time when a main power supply is set to an ON state does not exceed a first time, or a second elapsed time from a time when the photometric switch is set to a ON state for said photometric operation does not exceed a second time;
an angular velocity sensor that is used to calculate a hand-shake quantity for said anti-shake operation; and
a high-pass filter that reduces a low frequency component of an output from said angular velocity sensor, said first time being equal to a length of a charging period of said high-pass filter, said second time being equal to an interval preceding a convergence of a variance between a real reference value for a high-pass filter operation of said high-pass filter and an ideal reference value for the high-pass filter operation of said high-pass filter, an occurrence of the variance being based on a drift effect.
2. The anti-shake apparatus of claim 1 , wherein electrical power is supplied to said angular velocity sensor and said high-pass filter after said main power supply is set to the ON state,
calculation of said hand-shake quantity commences after said photometric switch is set to the ON state; and
said anti-shake operation based on calculation of said hand-shake quantity commences after said release switch is set to the ON state.
3. The anti-shake apparatus of claim 1 , further comprising:
a finder that has a finder display,
wherein a photographic subject image can be optically observed by said finder, and
wherein said controller indicates a state of said anti-shake operation on said finder display.
4. The anti-shake apparatus of claim 1 , further comprising:
a mover that has a movable area on an xy plane that is perpendicular to an optical axis of a camera lens of said photographing apparatus,
said mover being fixed to a center of a range of movement of said mover when said photographing operation is performed without said anti-shake operation.
5. The anti-shake apparatus of claim 1 , further comprising:
an anti-shake switch that is used for ON/OFF control of said anti-shake operation,
said controller performing said photographing operation without said anti-shake operation when said release switch is set to the ON state and it is determined that either said first elapsed time does not exceed said first time, or said second elapsed time does not exceed said second time, even if said anti-shake switch is set to the ON state.
6. A photographing apparatus, comprising:
a shutter mechanism that is open during a time of exposure for a photographing operation;
a finder;
an anti-shake apparatus that has a photometric switch, a release switch, and a controller that performs said photographing operation without an anti-shake operation when said release switch is set to an ON state, and it is determined that either a first elapsed time from a time when a main power supply is set to an ON state does not exceed a first time, or a second elapsed time from a time when said photometric switch is set to an ON state does not exceed a second time;
an angular velocity sensor that is used to calculate a hand-shake quantity for said anti-shake operation; and
a high-pass filter that reduces a low frequency component of an output from said angular velocity sensor, said first time being equal to a length of a charging period of said high-pass filter, said second time being equal to an interval preceding a convergence of a variance between a real reference value for a high-pass filter operation of said high-pass filter and an ideal reference value for the high-pass filter operation of said high-pass filter, an occurrence of the variance being based on a drift effect, wherein a photographic subject image can be optically observed by said finder.