Illumination – Light source and modifier – Plural serial lens elements or components
Patent
1976-09-10
1978-07-18
Gonzales, John
Illumination
Light source and modifier
Plural serial lens elements or components
362293, 362296, A61B 106
Patent
active
041019571
ABSTRACT:
An illuminating lamp for use in dentistry or medical clinic which provides for varying both the intensity of light output and the size of the illuminated area while maintaining a substantially constant color temperature. In this illuminating lamp, a light source consisting of a high intensity halogen bulb positioned horizontally at the inner focus of an ellipsoidal reflector projects through the aperture of a radiation reflecting disc; the light beam then converges at the external conjugating focus before reaching an optical zoom unit consisting of a heat absorbing filter positioned between one fixed and one movable lens. The beam intensity and its projected illumination area are manipulated with the zoom mechanism while the light beam spectral color temperature is controlled by the characteristics of a heat absorbing filter in conjunction with a spectral correction coating on the backside of the front covering glass. In addition, a special electrical circuit has been provided to eliminate the "cold-shock" to the filament of the halogen bulb in order to prolong its service life, along with an surge interruptor for the on-off switch in order to eliminate the possibility of a fire hazard throughout the electrical power system.
REFERENCES:
patent: 1695556 (1928-12-01), McGunnigle
patent: 3469145 (1969-09-01), Ralke et al.
patent: 3711700 (1973-01-01), Westlund et al.
patent: 3930149 (1975-12-01), French
Gonzales John
Lojacono Francis X.
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