Optical: systems and elements – Lens – With viewed object or viewed field illumination
Patent
1991-02-22
1993-03-09
Henry, Jon W.
Optical: systems and elements
Lens
With viewed object or viewed field illumination
359724, 359821, 359827, G02B 2720, G02B 2700
Patent
active
051930315
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an optical device intended to be combined with a laser beam type target marker in order to improve the visibility of a target inside a dim building by means of light intensifying goggles (commonly known as night vision goggles).
A laser beam type target marker comprises a laser generator which generally emits radiation within the infrared range and is provided with a collimator which produces a narrow beam having very slight divergence which gives, for example, a circle of light of 35 millimeters at a distance of 100 meters. Although apparatus of this type is obviously effective for night observation, the lighting power of the beam inside a very dim building is so intense over a small area that it produces a dazzling halo of light round the light spot, which gives the operator the impression of working in fog and makes it impossible for him to discern the target correctly.
The present invention overcomes this drawback by means of an optical device which is characterised by a divergent lens perforated in its centre by a small diameter hole and intended to be placed opposite the aperture of a laser beam type marker in order to pick up the laser beam comprising substantially parallel rays from the marker, the lens deflecting the laser rays which reach it round the central hole in order to produce a divergent beam while the rays which reach the central hole pass through it without being deflected so as to form a fine pencil of light of higher intensity which serves to mark a target.
The divergent lens can be mounted in an aperture provided in a body which is intended to be slid on and to cover the head of a laser beam type target marker. It can also be mounted in the head of a laser beam type target marker at the location of the usual aperture.
The device according to the invention is described hereinafter with reference to the accompanying drawings.
FIG. 1 is a perspective view of an example of a divergence device according to the invention.
FIG. 2 shows the device in FIG. 1 positioned on an example of a laser beam type marker.
FIG. 3 shows an axial section through a variation of the device in FIG. 1.
FIG. 4 shows an example of a laser beam type marker with an axial section through the head of the marker.
FIG. 5 is an axial section of the device in FIG. 3 positioned on the laser beam type marker shown in FIG. 4.
FIG. 6 shows the use of the device shown in FIG. 5 to operate outside.
FIG. 7 shows the head of an example of a laser beam type marker in which a divergence device according to the invention is incorporated.
FIGS. 8 and 9 show two variations of the divergent lens according to the invention incorporated into the head of a laser beam type marker.
FIG. 1 shows an embodiment of the divergence device according to the invention. This is a device in the form of a cap intended to be fitted on the head of a laser beam type marker, as shown in FIG. 2. A laser beam type marker is an apparatus generally mounted on a firearm to render a target visible or more visible in the obscurity. The divergence device according to the invention, designated in its entirety by reference numeral 1, comprises a hollow body 2 of general cylindrical shape which is open at one end and closed at its opposite end by an aperture 3 equipped with a divergent lens 4 perforated in its centre by a hole 5 having a very small diameter, for example of 0.5 millimeters. The body can be produced from synthetic or natural material. The divergent lens 4 can be produced from organic or mineral material and it can be given a non-reflective and/or non-scratch treatment.
The aperture 3 with the divergent lens 4 is preferably separable from the body 2 to facilitate its use on a marker, as will be seen hereinafter. In the embodiment shown in FIG. 1, the aperture 3 is attached to the body 2 by a flexible cord 7 which prevents it from being lost when it is separated from the body. The stud 8 is provided to receive the aperture 3 when the divergent lens 4 is not used. In a further embodiment, a fixed, inseparable aperture 3
REFERENCES:
patent: 3947093 (1976-03-01), Goshima et al.
patent: 4256370 (1981-03-01), Gold
patent: 4429957 (1984-02-01), King
patent: 4897536 (1990-01-01), Miyoshi
patent: 4920053 (1990-08-01), Inoue et al.
International Defense Review, vol. 21, No. 10, "Eyes Like a Hawk . . . With Owl", p. 1291 (Oct. 1988).
Henry Jon W.
Meroni, Jr. Charles F.
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