JP2012011143A5

JP2012011143A5 -

Info

Publication number: JP2012011143A5
Application number: JP2010153458A
Authority: JP
Filing date: 2010-07-05
Publication date: 2013-07-11
Anticipated expiration: 2030-07-05

Description

本発明の一態様にかかる内視鏡装置は、LED駆動用電源と、照明用のLEDのアノード側接片、及びカソード側接片の２つの接片を、先端部に有する挿入部と、前記挿入部の基端側において、前記アノード側接片に接続された信号線と前記LED駆動用電源との間の第１の電圧を監視するための電圧監視回路と、前記LEDへ電力供給するための定電流回路と、前記電圧監視回路によって監視された前記第１の電圧と、所定の閾値とを比較する機能を備え、前記第１の電圧と、所定の閾値との比較結果に基づいて、前記LEDのアノード側接片、又は前記LEDのカソード側接片の少なくともいずれか一方の短絡を検知するための制御回路と、を有する。 An endoscope apparatus according to one aspect of the present invention includes an LED drive power source, an insertion portion having two contact pieces , an anode side contact piece and a cathode side contact piece of an LED for illumination, at the proximal end side of the insertion portion, the first voltage monitoring circuit for monitoring the voltage between the signal line connected to the anode side contact piece and the LED driving power supply, for supplying power to the LED A constant current circuit, and a function of comparing the first voltage monitored by the voltage monitoring circuit with a predetermined threshold, based on a comparison result between the first voltage and the predetermined threshold, and a control circuit for detecting the anode side contact piece, or at least one of a short circuit of the cathode-side contact piece of the LED of the LED.

Claims

LED drive power supply,
An insertion portion having two contact pieces , an anode side contact piece and a cathode side contact piece of an LED for illumination, at a tip portion;
A voltage monitoring circuit for monitoring a first voltage between the signal line connected to the anode-side contact piece and the LED driving power source on the proximal end side of the insertion portion;
A constant current circuit for supplying power to the LED;
Said first voltage monitored by the voltage monitoring circuit has a function of comparing the predetermined threshold value, said first voltage, based on a comparison result between a predetermined threshold value, the anode side contact of the LED a control circuit for detecting pieces, or at least one of a short circuit of the cathode-side contact piece of the LED,
An endoscope apparatus characterized by comprising:

The endoscope apparatus according to claim 1, wherein the predetermined threshold is a value determined based on a line resistance of the insertion portion and a driving voltage of the LED.

The predetermined threshold is:
Smaller than the voltage between the signal line connected to the anode side contact and the LED driving power source when the LED is driven in a state where there is no short circuit in either of the two contact pieces, and A first threshold value greater than a voltage between a signal line connected to the anode-side contact piece and the LED driving power source when there is a short circuit between the two contact pieces is included. The endoscope apparatus according to claim 2.

The predetermined threshold is:
When the LED is driven in a state where only the anode-side contact piece is short-circuited, the voltage is lower than the voltage between the signal line connected to the anode-side contact piece and the LED driving power source, and is larger than 0. The endoscope apparatus according to claim 3, further comprising a second threshold value.

The voltage monitoring circuit is for monitoring a second voltage between the signal line connected to the cathode side contact piece and the constant current circuit on the proximal end side of the insertion portion,
Wherein the control circuit, by comparing the been the first monitoring a second voltage with a predetermined threshold by the voltage monitoring circuit, used for detecting at least one of a short circuit of the two contact pieces The endoscope apparatus according to claim 4, wherein the endoscope apparatus is provided.

The predetermined threshold is based on a voltage between the signal line connected to the cathode side contact and the constant current circuit when the LED is driven in a state where neither of the two contact is short-circuited. The endoscope apparatus according to claim 5, wherein the endoscope apparatus is also small.

2. The control circuit according to claim 1, wherein when the short circuit is detected, the control circuit has a function of cutting off an output of the LED driving power source or reducing an output of the LED driving power source . Endoscopic device.