Seiko Precision Inc.

Osamu Miyauchi

Chiaki Nemoto

Makoto Mikami

Kunioki Takahashi

To prevent a front end of a slit forming sector of one of an open shutter sector group and a close shutter sector group from colliding with an upper edge portion of a partition opening of a partition plate and preventing leakage of light, a partition plate is provided with a partition plate opening and a projection is formed on the partition plate for preventing sector collision. The projection is formed slightly lower than the level of the upper edge portion of the partition plate opening so that immediately before a slit forming sector of the close shutter sector group comes into contact with the upper edge portion of the partition plate opening, a front end of the slit forming sector rides over the projection and is displaced from the upper edge portion of the partition plate opening. When the slit forming sector is fully closed, a lower face of the front end of the slit forming sector is separated from the projected portion and is brought into close contact with the partition plate by its own elastic force.

Focal-plane shutter for camera

A shutter for a camera has a film advance mechanism for advancing film past a shutter opening and a stroboscope for emitting light. The shutter has a base plate having the shutter opening, opening sectors for undergoing opening movement in an operational state to open the shutter opening during a shutter release operation, and closing sectors for undergoing closing movement in an operational state to close the shutter opening during the shutter release operation. A first detecting device detects the operational state of the opening sectors and outputs a signal to the stroboscope to emit light. A second detecting device detects the operational state of the closing sectors and outputs a signal for winding up the film. A non-opened state of the shutter opening is detected after the shutter release operation when the second detecting device detects the operational state of the closing sectors before the first detecting device detects the operational state of the opening sectors.

Growing community of inventors

Narashino, Japan

Osamu Miyauchi