Optical: systems and elements – Glare or unwanted light reduction – Directional or angular discrimination
Reexamination Certificate
2002-02-22
2004-03-02
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Glare or unwanted light reduction
Directional or angular discrimination
C359S399000, C359S297000, C359S601000, C250S2140VT
Reexamination Certificate
active
06698904
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a safety device for a telescope, and more specifically to a safety device for a telescope that prevents the eyes of an observer from being damaged when a strong light-generating object such as the sun enters the field of vision.
BACKGROUND ART
Sight-seeing telescopes that can be used by inserting a coin are frequently provided to enable a distant view to be enjoyed at sight-seeing resorts having a sweeping view. If the sun is erroneously observed through such sight-seeing telescopes, the eyes can suffer major damage from the energy involved. To prevent such accidents, a notice is attached warning against viewing the sun.
However, it is difficult to completely exclude such a risk using just a warning notice. Such an accident would successfully be prevented if a warning could be emitted, closing the optical path of the telescope or attenuating the quantity of light when it seems that the sun is going to enter the telescope's field of vision.
Taking such facts into account, the present invention intends to provide a safety device for a telescope that can prevent the eyes of an observer from being damaged when a strong light-generating object such as the sun enters the field of vision.
SUMMARY OF THE INVENTION
To achieve this object, the present invention employs an arrangement having means for measuring a quantity of light incident into a field of vision that is a predetermined angle larger than the telescope's actual field of vision, and means for closing the telescope's optical path or attenuating the quantity of light to a safe level when the quantity of light is larger than a predetermined quantity of light.
REFERENCES:
patent: 3273458 (1966-09-01), Kohler
patent: 3602576 (1971-08-01), Kohler et al.
patent: 5729010 (1998-03-01), Pinkus et al.
patent: 2 043 944 (1980-10-01), None
patent: 7-27983 (1995-01-01), None
patent: 7-19718 (1995-04-01), None
patent: 10-153740 (1998-06-01), None
Goto Yoshihide
Iiyama Shiroh
Niino Masao
Adams & Wilks
Kowa Kabushiki Kaisha
Nguyen Thong
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