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US 5,539,622 AGranted
Strobe device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTuyoshi Ishikawa
Life of this patent
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Abstract
A strobe device is provided, including a light source and a reflector which reflects part of the light emitted from the light source. The reflector is provided with a reflecting surface that is shaped to form virtual images of the light source behind the reflecting surface.
Claims8
A strobe device, comprising:
- a light source for emitting light;
- and a reflector which reflects light emitted from said light source, said reflector comprising reflecting surface means for forming virtual images of said light source behind said reflector;
- said light source comprising a light emitting tube;
- said reflecting surface means comprising a substantially arch-shaped first reflecting portion provided on at least one of an outer and inner surface of said light emitting tube and substantially planar second reflecting portions which are connected at one end to said first reflecting portion and defined by tangential planes of a circle defined by the outer surface of said light emitting tube;
- and
- wherein the following relationship exists:
- sin(A).apprxeq.{r+{r.sup.2 +8e.sup.2).sup.1/2 }/4e
- e.apprxeq.d.multidot.tan(A)
- wherein e designates a half value of a length of an opening defined by another end of said second reflecting portions;
- r designates a radius of the light emitting tube;
- d designates a distance between a center of the light emitting tube and the opening along an optical axis of the strobe device;
- and, A designates an angle between one of the second reflecting portions and a line normal to the optical axis.
9 more elements
A strobe reflecting mirror for reflecting light emitted from a light source of a strobe, said light source comprising a light emitting tube, said reflecting mirror comprising:
- a first reflecting portion, provided in the vicinity of said light source, which is shaped to cover at least a portion of said light source and to form a real image of said light source at a light emitting point of said light source;
- and,
- second reflecting portions which are connected to said first reflecting portion and positioned in such a manner that a virtual image of said light source is formed behind said second reflecting portions;
- wherein the following relationship exists:
- sin(A).apprxeq.{r+(r.sup.2 +8e.sup.2).sup.1/2 }/4e
- e.apprxeq.d.multidot.tan(A)
- wherein e designates a half value of a length of an opening defined by said second reflecting portions;
- r designates a radius of the light emitting tube;
- d designates a distance between a center of the light emitting tube and the opening along an optical axis of the strobe;
- and, A designates an angle between one of the second reflecting portions and a line normal to the optical axis.
7 more elements
Dependencies are inferred from the claim text.