Endoscope apparatus
First Claim
1. An endoscope apparatus configured for use in a potentially explosive environment, the endoscope apparatus comprising:
- a scope unit having a control unit;
an image pickup element disposed at a tip of the scope unit;
an insertion portion connected to the control unit;
a main unit connected to the scope unit and the control unit;
a barrier circuit disposed in the scope unit which uses a zener diode connected to ground so as to limit energy applied to a circuit; and
an image pickup element drive board disposed in the scope unit so as to produce various pulses for driving the image pick up element and to produce a power supply,wherein the barrier circuit is configured to pass an output signal to the image pickup element and an input signal from the image pickup element and the barrier circuit is further configured to limit an output signal from the image pickup element drive board, to an extent sufficient to eliminate the output signal as a factor in causing explosion in said potentially explosive environment, and;
wherein the barrier circuit includes a circuit device coated with an electrically insulating material.
3 Assignments
0 Petitions
Accused Products
Abstract
A scope unit 2 including a control unit 3 and an insertion portion 4 is attached to a main unit 1 via a scope connector 5. An optical adaptor 8 is attached to a tip of the insertion portion 4. The CCD 31, HICs 32, 33, and the thermistor 34 are attached to the tip of the insertion portion 4. A liquid crystal module 36 is attached to the optical adaptor 8. A barrier circuit 64 limits energy supplied to these components in a circuit disposed in the scope unit 2. By disposing the barrier circuit 64 in the scope connector 5, the portion extending from the barrier circuit 64 to, i.e., the control unit 3, the insertion portion 4, and the optical adaptor 8 are of the explosion-proof construction. Thus, these can be used in a hazardous explosive location. Thus, an endoscope apparatus that can be used in combustible gas or dust can be provided.
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Citations
22 Claims
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1. An endoscope apparatus configured for use in a potentially explosive environment, the endoscope apparatus comprising:
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a scope unit having a control unit; an image pickup element disposed at a tip of the scope unit; an insertion portion connected to the control unit; a main unit connected to the scope unit and the control unit; a barrier circuit disposed in the scope unit which uses a zener diode connected to ground so as to limit energy applied to a circuit; and an image pickup element drive board disposed in the scope unit so as to produce various pulses for driving the image pick up element and to produce a power supply, wherein the barrier circuit is configured to pass an output signal to the image pickup element and an input signal from the image pickup element and the barrier circuit is further configured to limit an output signal from the image pickup element drive board, to an extent sufficient to eliminate the output signal as a factor in causing explosion in said potentially explosive environment, and; wherein the barrier circuit includes a circuit device coated with an electrically insulating material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An endoscope apparatus configured for use in a potentially explosive environment, the endoscope apparatus comprising:
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a scope unit including a control unit; an image pickup element disposed at a tip of the scope unit; an insertion portion connected to the control unit; a main unit connected to the scope unit and the control unit; a barrier circuit disposed in the scope unit which includes a zener diode connected to ground and configured to limit energy applied to a circuit, to an extent sufficient to eliminate the energy as a factor in causing explosion in said potentially explosive environment, and an image pickup element drive board disposed in the scope unit so and configured to produce various pulses for driving the image pick up element and to produce a power supply, wherein the barrier circuit is configured to pass an output signal to the image pickup element and an input signal from the image pickup element, the barrier circuit is further configured to limit an output signal from the image pickup element drive board, to an extent sufficient to eliminate the output signal as a factor in causing explosion in said potentially explosive environment, and the barrier circuit includes a circuit device coated with an electrically insulating coating material so as to shorten a distance between circuit patterns of the barrier circuit. - View Dependent Claims (22)
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Specification