Camera having a shutter measuring apparatus

A camera having a shutter measuring apparatus, comprising:

• a shutter which makes an aperture portion openable and closable, said shutter being changeable to a transmitting state of admitting a transmission object light through said aperture portion and to an intercepting state of intercepting the transmission thereof;
• a driver which causes said shutter to open and close aperture portion by driving said shutter;
• a measuring unit which measures a state-of-transmission time of said shutter when driven by said driver;
• a setting unit which sets a time for which said shutter is to be in the transmitting state;
• and
• an inhibiting unit which is electrically connected to said setting unit and said measuring unit, and which inhibits an operation of said measuring unit if the time set by said setting unit is longer than a predetermined time.

A camera having a shutter measuring apparatus, comprising:

• a shutter device having shutter blades to make an aperture portion openable and closable with said shutter blades, said shutter device being changeable to a transmitting state of admitting a transmission object light through said aperture portion and to an intercepting state of intercepting the transmission thereof;
• a driving mechanism to cause said shutter blades to open and close said aperture portion by driving said shutter device;
• and
• a detecting device, having plural pairs of light projecting elements to project the light toward said shutter device and light receiving elements to receive the light reflected from said shutter device, said plural pairs of light projecting elements and light receiving elements being provided on a same side in relation to said shutter blades, to detect an operating state of said shutter device when driven by said driving mechanism on the basis of outputs of said plurality of light receiving elements.

A method of detecting a shutter driving state of a camera, comprising the steps of:

• driving a shutter having shutter blades by a shutter driving mechanism and causing said shutter to open and close an aperture portion on a shutter base with said shutter blades;
• changing over said shutter to a transmitting state of admitting a transmission of object light through said aperture portion and to a light intercepting state of intercepting the transmission thereof by opening and closing said aperture portion;
• projecting light toward said shutter;
• and
• measuring a state-of-transmission time of said shutter when driven by said shutter driving mechanism by receiving the light reflected from said shutter, wherein the light is projected from and received on a same side in relation to said shutter blades.

A method of detecting a shutter driving state of a camera, comprising the steps of:

• driving a shutter by a shutter driving mechanism and causing said shutter to open and close an aperture portion on a shutter base;
• changing over said shutter to a transmitting state of admitting a transmission of object light through said aperture portion and to a light intercepting state of intercepting the transmission thereof by opening and closing said aperture portion;
• setting a time for which said shutter is to be in the transmitting state;
• and
• inhibiting a measuring action of a state-of-transmission of said shutter when driven by said shutter driving mechanism if the set time is longer than a predetermined time.

A method of detecting a shutter driving state of a camera, comprising the steps of:

• driving a shutter having shutter blades by a shutter driving mechanism and causing said shutter to open and close an aperture portion on a shutter base with said shutter blades;
• changing over said shutter to a transmitting state of admitting a transmission of object light through said aperture portion and to a light intercepting state of intercepting the transmission thereof by opening and closing said aperture portion;
• projecting the light toward said shutter through a plurality of light projecting elements;
• and
• measuring a state-of-transmission time of said shutter when driven by the shutter driving mechanism in accordance with outputs of light receiving elements respectively corresponding to said light projecting elements, wherein said light projecting elements and said light receiving are provided on a same side in relation to said shutter blades.