JPH0316136U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the sequential operation of the shutter of the present invention. FIG. 2 is a schematic explanatory diagram showing the main parts of the shutter of the present invention. FIG. 3 is a schematic explanatory diagram showing a state in which the opening degree of the shutter blade of the shutter shown in FIG. 2 is defined. 1... Drive ring, 5... Lens setting ring, 8... Lens stop lever, 10, 11...
Shutter blade, 13... Opening/closing lever, 16...
Opening locking lever, 20...Opening locking claw.

Claims (1)

[Scope of utility model registration request] The driving ring is rotated forward and backward by a stepping motor energized by a command from the sequential operation control circuit of the camera. a lens setting ring that is interlocked with the photographic lens so as to set the lens to the normal rotation position; a lens stop lever that releasably locks the lens setting ring in the normal rotation position; and an opening/closing lever that controls the opening degree of the shutter blade. an opening/closing lever that releasably locks the opening/closing lever in the shutter blade closed position during normal rotation of the drive ring; an opening locking pawl provided on the opening locking lever and a cam protrusion provided on the drive ring that cooperate to enable the opening/closing lever to operate in the shutter blade open position; a sloped cam formed on the opening/closing lever that engages with the opening/closing lever operating protrusion of the drive ring to set the shutter blades at a predetermined shutter blade opening position during reversal of the shutter; When the shutter blade is brought to the shutter blade opening position, the stepping motor is rotated in the normal direction again by a command from the sequential operation control circuit, so that the opening/closing lever can be rotated to the shutter blade fully open position. The operating step is set at an electrically stable point, thereby doubling the stopping position of the stepping motor;
The shape of the slope cam is such that after the drive ring is brought to the predetermined shutter blade opening position, the drive ring is rotated in the forward direction to a position corresponding to each predetermined half-step of the stepping motor. said opening/closing lever is shaped so as to be able to position said opening/closing lever so as to define a respective predetermined stage of shutter blade opening when said opening/closing lever comes into contact with said inclined cam; The drive ring reverses the drive lever again after an exposure time defined based on the signal from the automatic exposure control circuit of the camera by the trigger signal from the sequential operation control circuit, and operates the opening/closing lever to the shutter blade closed position. Finally, the lens setting ring and the opening/closing lever are returned to their initial positions by further reversing of the driving ring, and the sequential operation control circuit causes the driving ring to correspond to the fully open position of the opening/closing lever. By operating the drive ring to a position corresponding to a predetermined maximum opening limit position of the opening/closing lever, the drive ring can be selectively operated as a program shutter, or as an aperture priority shutter by operating the drive ring to a position corresponding to a predetermined maximum opening limit position of the opening/closing lever. A shutter with a lens drive device characterized by: