Variable illuminating angle mechanism for a flash unit

Details Variable illuminating angle mechanism for a flash unit Variable illuminating angle mechanism for a flash unit

1996-07-23

1999-03-02

Metjahic, Safet

Photography

With object illumination for exposure

Variable illumination angle

396178, G03B 1505

Patent

active

058782915

ABSTRACT:
A variable illuminating angle mechanism which can vary the illuminating angle of a flash unit. The variable illuminating angle mechanism includes a device which prevents a light emitting body or an illuminating lens from being moved in excess of a range of normal movement. The variable illuminating angle mechanism includes a drive shaft having a screw thread formed on a circumferential surface of the drive shaft and a drive device to rotationally drive the drive shaft. A transmission member in threaded connection to the drive shaft is moved by rotation of the drive shaft, and a transmission device moves the light emitting unit or the illuminating lens via movement of the transmission member. An escape device is positioned at at least one end of the drive shaft to disconnect the transmission member from the drive shaft when the transmission member is moved beyond a normal operating range of the light emitting unit or illuminating lens. When the escape device disconnects the drive shaft from the transmission member, the drive shaft rotates without driving the transmission member to prevent the variable illuminating angle mechanism from locking and causing damage to the variable illuminating angle mechanism components.

REFERENCES:
patent: 4423940 (1984-01-01), Kashihara et al.
patent: 5040007 (1991-08-01), Hagiuda
patent: 5280315 (1994-01-01), Nomura et al.
patent: 5363162 (1994-11-01), Kaihara et al.
patent: 5384612 (1995-01-01), Kaihara et al.
patent: 5502530 (1996-03-01), Kaihara et al.

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