Electronic endoscope provided with a sample-hold circuit

Details Electronic endoscope provided with a sample-hold circuit Electronic endoscope provided with a sample-hold circuit

1989-06-08

1991-05-21

Sikes, William L.

Illumination

Supported by vehicle structure

Condition responsive

362279, G02B 2326

Patent

active

050169750

ABSTRACT:
An electronic endoscope having a light emitting unit for emitting illuminating light from the tip of the insertable part, a solid state imaging device at the tip for receiving an illuminated light image, a sample-holding circuit for sample-holding an output signal from the solid state imaging device, a light source for such light emitting unit and an iris device in such light source, the iris device comprising a diaphragm device for preventing the spectral characteristics of the endoscope from being changed due to the amount of light reduction which consists of a diaphragm assembly consisting of two dimensionally diaphragm units which consists of light passing openings with small sectional area and light shading parts formed by tubular surfaces surrounding the side surfaces of the openings, positioned in the beam emitted from illuminating lamp, and provided with means for turning diaphragm assembly from a position where the tubular surfaces are in parallel with the axis of the illumination beam to a position where the axes are at an angle.

REFERENCES:
patent: 1335889 (1920-04-01), Fulton
patent: 1467194 (1923-09-01), Petersen
patent: 1659409 (1928-02-01), Porter
patent: 1703668 (1929-02-01), Grosius

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