Illumination – Revolving
Patent
1981-06-19
1983-11-15
Lechert, Jr., Stephen J.
Illumination
Revolving
362276, 362321, 362802, 362804, F21V 704
Patent
active
044159528
ABSTRACT:
A light source unit for an endoscope is provided with a light-emitting element and a light receiving element which are provided in an eyepiece section of an endoscope. The light-emitting element is supplied with current modified by a specific frequency from an oscillating circuit and produces a light-intensity modulated light. An output signal from the light receiving element is supplied to a filter circuit and a signal of the specific frequency component is taken out from the filter circuit to be compared with a reference voltage in a Schmidt circuit. When an operator approaches to the light receiving element and enters a range within a predetermined distance from the light receiving element, a light intensity of the light which is emitted from the light emitting element toward the operator, reflected from the operator, and is incident on the light receiving element, becomes large. As a result, a signal level supplied to the Schmidt circuit exceeds a predetermined value. At this time, a signal for turning on a light source is produced from the Schmidt circuit to energize a relay and to close a contact of the relay. Then, electric power is supplied from a power source to the light source to turn on the light source. As a result, an illuminating light is supplied from the light source to a light guide of the endoscope, whereby an area of an objective portion can be observed through an image guide of the endoscope.
REFERENCES:
patent: 3594061 (1971-07-01), Selvage
patent: 3760798 (1973-09-01), Edinger
patent: 3863243 (1975-01-01), Skolnick et al.
patent: 4053756 (1977-10-01), Takahashi
patent: 4209225 (1980-06-01), Kumiomi et al.
patent: 4356534 (1982-10-01), Hattori
Hattori Shin-ichiro
Inoue Yasuo
Lechert Jr. Stephen J.
Olympus Optical Co,. Ltd.
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