A fiberoptic bundle or liquid light guide for a borescope, fiberscope or videoscope is coupled to the light source using a light guide coupler having a plurality of air passages to vent excess heat. The illumination unit comprises a fan that draws cool air through the passages into the light source to remove excess heat from the light guide coupler. Heat radiators can be added to the coupler to increase its surface area and to improve heat dissipation. Air baffles can be added to optimize the ai...

The invention provides an ultraviolet remote visual inspection system which enables the operator to detect minute cracks and hairline flaws in normally inaccessible places of manufactured parts. The system includes a fiberscope in combination with a source of white light and ultraviolet light and a plurality of cannisters for holding dye penetrant and other materials which can be used to facilitate the inspection. The fiberscope includes an articulated probe having a working channel, an ultravio...

An angioscope has irrigation system with at least two presettable irrigant flow rates. A footswitch under manual control is operatively connected to a roller pump for switching from a high first flow rate to a low second flow rate. Upon an initial filling of a blood vessel under observation with clear irrigant at the high flow rate, the operator switches to the low flow rate. The rate of fluid flow may alternatively be continuously variable under manual control.

A system employing a stroboscopic light source permits an operator to remotely inspect and analyze high speed repetitive motion of machines. The system enables an operator to freeze motion or permit slow motion in either direction of moving parts in their natural environment. The system effectively shields the electronics incorporated in the light source by separating the electronics into sections and by utilizing a fiber optic cable to carry a control signal which control the firing of the flas...

Protective sleeve, into which a conventional fiberscope or videoscope is inserted, is mounted so as to extend into a high pressure or high/ultra-high vacuum chamber to permit inspections or monitoring therewithin. In a first embodiment the protective sleeve comprises first and second body portions, each comprised of bellows-like flexible stainless steel. The second section has a length substantially corresponding to the articulatable distal end of a fiberscope or videoscope to be articulatable t...

An objective lens includes a first lens unit with positive refracting power and a second lens unit on the specimen side of the first lens unit. The first lens unit has at least one lens and the second lens unit has at least one optical element, satisfying the following conditions: ##EQU1## where .nu..sub.dLD is the Abbe's number of glass material of the lens, .nu..sub.dHD is the Abbe's number of glass material of the optical element, .phi..sub.II1 is the refracting power of a first surface of th...

An electronic image pickup apparatus according to the present invention includes a holding barrel, a lens frame supported by guide shafts inside the holding barrel and slidable and moveable in a direction of an optical axis, a light beam adjusting unit including an aperture and/or shutter for mechanically adjusting a light beam passing through the lens frame, and an image pickup element for converting an object image passed through the light beam adjusting unit to an electrical signal. The light...

A variable resistance circuit and application circuits using the same capable of offsetting the variance in the manufacture of integrated circuit and the influence of ambient temperatures, including: a control circuit having a plurality of constant-current output terminals, with a constant current ratio of the output terminals varied by signals applied to a control terminal; an operational amplifier; a resistor; and a plurality of MOS transistors having the gates thereof connected in common; and...

A treatment apparatus to treat a tissue in a body cavity is disclosed. The apparatus comprises a base disposed in the vicinity of a tip-end portion of an endoscope, and an in-tissue inserting portion including a base end supported by the base and a tip end insertable in the tissue in the body cavity in a direction substantially parallel to the surface of the tissue, and extending to the tip end from the base end in a tapered shape. The in-tissue inserting portion has an inner side disposed in th...

There is disclosed an optical encoder in which a scale can be displaced to cross a first light beam emitted from a first light source, and has a first light modulation region formed of a predetermined-period optical pattern irradiated with the first light beam to generate a diffraction pattern. First photodetector has a light receiving surface for receiving the first light beam transmitted through the first light modulation region of the scale, and has a single or a plurality of light receiving ...