Variable emission angle strobe light and control method therefor

Details Variable emission angle strobe light and control method therefor Variable emission angle strobe light and control method therefor

1997-05-29

1999-06-08

Gray, David M.

Photography

Flash system responsive to focal length or distance

Illumination angle responds to focal length or distance

396175, 362 18, G03B 1724

Patent

active

059110856

ABSTRACT:
In order to vary a light emission angle, a light source is moved so that its position relative to a reflector is varied. In one mode, by compulsively moving the light source to one end of a movement range of the light source, the one end is set as an original position. In another mode, after the light source is compulsively moved to the one end, by detecting that the light source has reached a position preset in the movement range while the light source is being moved to the other end of the movement range, a distance by which the light source is moved from the one end to the preset position is detected and stored as control information. The subsequent operation to move the light source to a desired control position is controlled based on the original position which is the one end or based on the control information.

REFERENCES:
patent: 4730201 (1988-03-01), Sasagaki
patent: 5486886 (1996-01-01), Vaynshteyn
patent: 5734934 (1998-03-01), Horinishi et al.

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