Electrical shutter of electromagnetic release type for camera
AssigneeOlympus Optical Co., Ltd.
InventorKatsuhiko Tsunefuji
Life of this patent
Estimating the term…
Abstract
An electrical shutter includes a locating member which maintains a shutter drive member at rest at its start position and which is constrained in abutment against the drive member in conjunction with a charging member, which rotates in response to a film winding operation, as a prime mover spring is being charged, thus holding the drive member against inadvertent movement. The locating member also urges a detent member against an electromagnet which is operative to control the closing operation of a shutter. The electrical shutter also includes switches which are associated with a data entry unit and a strobo unit and which are closed in response to an opening operation of the shutter.
Claims8
An electrical shutter of the electromagnetic release type for a camera comprising shutter blades, a charging member adapted to rotate about a single shaft in response to a film winding operation to charge a prime mover spring which is used to drive the shutter, a shutter drive member responsive to an electromagnetic release by rotating through substantially one revolution under the resilience of the prime mover spring to open and close said shutter blades, a locating member for maintaining the shutter drive member at rest at its start position before the shutter is operated, detent means cooperating with the charging member to constrain the locating member during the time the prime mover spring is being charged to maintain the shutter drive member in engagement with the locating member, an electrical shutter circuit including a first shutter release electromagnet and a second electromagnet controlling the shutter closing operation for automatically controlling a period of time during which shutter blades are maintained in their open position as a result of rotation of the shutter drive member.
An electrical shutter of the electromagnetic release type for a camera comprising shutter blades, a charging member adapted to rotate about a single shaft in response to a film winding operation to charge a prime mover spring which is used to drive the shutter, a shutter drive member responsive to an electromagnetic release by rotating through substantially one revolution under the resilience of the prime mover spring to open and close said shutter blades, a locating member for maintaining the shutter drive member at rest at its start position before the shutter is operated, detent means cooperating with the charging member to constrain the locating member during the time the prime mover spring is being charged to maintain the shutter drive member in engagement with the locating member, an electrical shutter circuit including a first shutter release electromagnet and a second electromagnet controlling the shutter closing operation for automatically controlling a period of time during which shutter blades are maintained in their open position as a result of rotation of the shutter drive member;
- first and second normally-open switches which are respectively associated with a data entry unit and a strobo unit;
- means responsive to said shutter drive member for closing said first and second normally-open switches when said shutter blades are in a fully open position.
Dependencies are inferred from the claim text.