Optical: systems and elements – Barrel end eye guard
Reexamination Certificate
2001-01-17
2001-12-25
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Barrel end eye guard
C359S409000, C359S507000, C359S511000
Reexamination Certificate
active
06332685
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an, in particular, ergonomically shaped eyepiece cup for binoculars.
2. Background Art
Eyepiece cups of the generic type have a human face contact area matched to the shape of the head in the vicinity of the eyes so that as close as possible a contact is attained, preventing scattered or extraneous light that might interfere with observation from entering. A close contact of this type, advantageous per se, is accompanied with the undesired side effect that the space between the eyepiece cup, the eye and the eyepiece is closed outwardly almost hermetically, there being the risk of fogging of the eyepiece lens.
SUMMARY OF THE INVENTION
It is an object of the invention to embody an ergonomically shaped eyepiece cup such that this fogging is largely prevented.
According to the invention this object is attained by air admission holes being formed on the eyepiece cup for ventilation of the interior.
Preferably it is provided that the air admission holes are distributed around the eyepiece cup at a distance from each other in the area above the eyepiece, the air current that enters through the air admission holes being deviated. In this way it is attained that no light can penetrate through the air admission holes and that the admitted air does not hit the eye of the user.
By advantage it can be provided that the admitted air current is deviated onto the inside of the eyepiece lens so that the lens is reliably kept non-fogging and the air current is guided away from the user's eye.
For optimal contact of the eyepiece cup with the user's face to be ensured in spite of adjustment of the eyepiece, the eyepiece cup may be pivotal relative to the eyepiece.
If binoculars with eyepiece cups according to the invention are used in the open air, the available blast will as a rule be sufficient to produce a satisfactory air current.
As compared to this, controlled ventilation may be provided in order to meet the requirements in very humid regions or in closed rooms as for example in watchtowers.
Such a controlled ventilation can be put into practice by a sort of a fan or by pumping action caused by the intrinsic elasticity of the eyepiece cups.
Details of the invention will become apparent from the ensuing description of a preferred embodiment, taken in conjunction with the drawing.
REFERENCES:
patent: 1965755 (1934-07-01), Warmisham
patent: 2919622 (1960-01-01), Hensoldt
patent: 4698857 (1987-10-01), Kastendieck et al.
patent: 4971429 (1990-11-01), Ishido et al.
patent: 20185 (1899-09-01), None
patent: 14224 (1907-04-01), None
Browdy and Neimark
Nguyen Thong
Steiner-Optik GmbH
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