Optical adaptor for endoscope and endoscope apparatus

1. An optical adaptor for endoscope comprising, in an outer casing:

at least one light emitter, having positive and negative electrodes, and serving as a light source for illumination;

two terminals connected between the positive and negative electrodes of the light emitter to be externally projected from the inside of the outer casing; and

a first and a second means for protecting the light emitter from static electricity, the first means for protecting being the outer casing to which static electricity escapes, and the second means for protecting being static-electricity protecting means that is arranged between the positive and negative electrodes of the light emitter and prevents the static electricity from being applied to the light emitter,

wherein the outer casing contains metal, and

wherein the static-electricity protecting means is a parallel circuit comprising two of a diode, a zener diode, and a varistor.

2. An optical adaptor for endoscope comprising, in an outer casing:

at least one light emitter, having positive and negative electrodes, and serving as a light source for illumination;

two terminals connected between the positive and negative electrodes of the light emitter to be externally projected from the inside of the outer casing; and

a first and a second means for protecting the light emitter from static electricity, the first means for protecting being the outer casing to which static electricity escapes, and the second means for protecting being static-electricity protecting means that is arranged between the positive and negative electrodes of the light emitter and prevents the static electricity from being applied to the light emitter,

wherein the outer casing contains metal, and

wherein the static-electricity protecting means is a normally-closed switch.

3. An optical adaptor for endoscope according to claim 2 , wherein the two terminals are caved in the outer casing from a surface of the outer casing.

4. An optical adaptor for endoscope according to claim 2 , wherein the light emitter is a light-emission diode.

5. An optical adaptor for endoscope comprising, in an outer casing:

at least one light emitter, having positive and negative electrodes, and serving as a light source for illumination;

two terminals connected between the positive and negative electrodes of the light emitter to be externally projected from the inside of the outer casing; and

a first and a second means for protecting the light emitter from static electricity, the first means for protecting being the outer casing to which static electricity escapes, and the second means for protecting being static-electricity protecting means that is arranged between the positive and negative electrodes of the light emitter and prevents the static electricity from being applied to the light emitter,

wherein the outer casing contains metal, and

wherein a cylindrical protecting member communicated with the inside and the outside of the outer casing is connected to the outer casing to be externally projected from the inside of the outer casing, and

the two terminals are caved in the protecting member from a surface of the projected protecting member,

the cylindrical protecting member being a third means for protecting the light emitter from static electricity.

6. An optical adaptor for endoscope according to claim 5 , wherein the protecting member contains metal.

7. An endoscope apparatus comprising:

an optical adaptor for endoscope comprising, in an outer casing, the outer casing containing metal, at least one light emitter, having positive and negative electrodes, and serving as a light source for illumination, two terminals connected to the positive and negative electrodes of the light emitter to be externally projected from the inside of the outer casing, and a first and a second means for protecting the light emitter from static electricity, the first means for protecting being the outer casing to which static electricity escapes, and the second means for protecting being static-electricity protecting means that is arranged between the positive and negative electrodes of the light emitter and prevents the static electricity from being applied to the light emitter; and

an endoscope insertion portion comprising two terminals that electrically come into contact with the two terminals of the optical adaptor for endoscope, when being attached to the optical adaptor for endoscope, and

wherein the static-electricity protecting means of the optical adaptor for endoscope is a normally-closed switch.

8. An endoscope apparatus according to claim 7 , wherein the two terminals are caved in the outer casing from a surface of the outer casing.

9. An endoscope apparatus according to claim 8 , wherein the endoscope insertion portion comprises two terminals that electrically come into contact with the two terminals in the outer casing, caved in the outer casing, when being attached to the optical adaptor for endoscope.

10. An endoscope apparatus comprising:

an optical adaptor for endoscope comprising, in an outer casing, the outer casing containing metal, at least one light emitter, having positive and negative electrodes, and serving as a light source for illumination, two terminals connected to the positive and negative electrodes of the light emitter to be externally projected from the inside of the outer casing, and a first and a second means for protecting the light emitter from static electricity, the first means for protecting being the outer casing to which static electricity escapes, and the second means for protecting being static-electricity protecting means that is arranged between the positive and negative electrodes of the light emitter and prevents the static electricity from being applied to the light emitter; and

an endoscope insertion portion comprising two terminals that electrically come into contact with the two terminals of the optical adaptor for endoscope, when being attached to the optical adaptor for endoscope, and

wherein a cylindrical protecting member communicated with the inside and the outside of the outer casing is connected to the outer casing to be externally projected from the inside of the outer casing, and

the two terminals are caved in the protecting member from a surface of the projected protecting member.

11. An endoscope apparatus according to claim 10 , wherein the endoscope insertion portion comprises two terminals that electrically come into contact with the two terminals in the protecting member, caved in the protecting member, when being attached to the optical adaptor for endoscope.

12. An endoscope apparatus comprising:

an optical adaptor for endoscope comprising, in an outer casing, the outer casing containing metal, at least one light emitter, having positive and negative electrodes, and serving as a light source for illumination, two terminals connected to the positive and negative electrodes of the light emitter to be externally projected from the inside of the outer casing, and a first and a second means for protecting the light emitter from static electricity, the first means for protecting being the outer casing to which static electricity escapes, and the second means for protecting being static-electricity protecting means that is arranged between the positive and negative electrodes of the light emitter and prevents the static electricity from being applied to the light emitter; and

an endoscope insertion portion comprising two terminals that electrically come into contact with the two terminals of the optical adaptor for endoscope, when being attached to the optical adaptor for endoscope,

wherein the static-electricity means of the optical adaptor for endoscope is a normally-closed switch, and

wherein the endoscope insertion portion has, at its distal end, a projected portion that opens the normally-closed switch, when being attached to the optical adaptor for endoscope.