JP3455151B2 - Endoscope device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an endoscope apparatus,
In particular, the present invention relates to an endoscope device characterized by a power supply circuit portion of a battery-type light source device that is detachable from the endoscope.

[0002]

2. Description of the Related Art At present, endoscope apparatuses are widely used in the medical field and the industrial field. In this endoscope apparatus, the site to be diagnosed or inspected is inside the living body, or inside the plant, equipment, etc., and therefore means for illuminating these site to be inspected is required. For this reason,
In a general endoscope device, a light source device is prepared as an external device of the endoscope, and illumination light from a light source lamp attached to a light source unit in the light source device is applied to a light guide fiber provided in the endoscope. It is configured to guide the light and emit the illumination light guided by the light guide fiber from the illumination window on the distal end side of the insertion portion to illuminate the inspection target site.

The above-mentioned light source device generally uses a power source supplied from a commercial power source to turn on a light source lamp inside the light source device.

On the other hand, for example, Japanese Patent Laid-Open No. 10-2249
The endoscope device described in Japanese Patent No. 26 is a device in which a battery-type light source device using a battery such as a dry battery as a power source is detachably attached to an operation portion of the endoscope. Such an endoscope device in which the battery-type light source device is detachably attached to the operation portion is easy to carry and can be used in a place without a power source, so that it is suitable for use in an emergency or outdoors. ing.

In the above-mentioned battery type light source device, the voltage supplied to the lamp in the device boosts the battery voltage and supplies an optimum and constant output voltage to the lamp. Therefore, when the battery is exhausted and the battery voltage drops, The input current must be increased in order to keep the output voltage constant, which causes a problem of stressing the circuit. Therefore, as the protection circuit, as is generally used in the protection circuit of a lithium-ion battery, the current is detected and the FET is used.
Is used to switch off.

[0006]

However, in the protection circuit which detects the current and switches off using the FET, the loss of the resistance for the current detection and the ON resistance of the FET becomes large, and the energy of the battery is efficiently saved. There is a problem that it cannot be used well.

The present invention has been made in view of the above circumstances, and protects the power supply circuit of the battery type light source device by detecting the voltage and shutting down the booster circuit when the battery capacity is exhausted. It is an object of the present invention to provide an endoscopic device that can be used.

[0008]

A first endoscope device of the present invention supplies an illumination light to an endoscope having a light guide capable of guiding the illumination light and an illumination light incident end of the light guide. And a battery type light source device that is detachably provided in the endoscope, having a power supply circuit that boosts the voltage of a battery that generates power for driving the lighting lamp and supplies power to the lighting lamp. And a detection circuit for detecting the exhausted state of the battery, and a protection circuit for shutting down and protecting the power supply circuit based on the detection result of the detection circuit. Second of the present invention
The endoscope device of No. 1 is characterized in that, in the first endoscope device, it is provided with a notifying unit for notifying the exhausted state of the battery before shutting down the power supply circuit by the protection circuit. A third endoscope device of the present invention includes an endoscope having a light guide capable of guiding illumination light, an illumination lamp for supplying illumination light to an illumination light incident end of the light guide, and power for the illumination lamp. battery and a battery-type light source device provided detachably to said endoscope has a capable of supplying a detection means for detecting a predetermined power consumption state of the battery, supply power of the battery to the illumination lamp Based on the detection result of the supply means and the detection means,
It is characterized by further comprising: control means for controlling the state of the amount of illumination light of the illumination lamp to be alternately repeated as a first state and a second state different from the first state .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 relate to a first embodiment of the present invention, FIG. 1 is a block diagram showing a configuration of an endoscope apparatus, and FIG. 2 is a configuration showing a configuration of a battery type light source apparatus of FIG. 3 is a block diagram showing a configuration of an internal circuit provided in the battery type light source device of FIG. 2, and FIG. 4 is a waveform diagram showing a time change of an input voltage and an input current supplied to the internal circuit of FIG. 5 is a block diagram showing the configuration of the DC / DC converter of FIG. 3, FIG. 6 is a block diagram showing the configuration of the protection circuit of FIG. 3, and FIG. 7 is a block diagram showing the internal configuration of the control circuit of FIG. 6 during PWM control. 8 is a block diagram showing an internal configuration of the control circuit of FIG. 6 during PFM control.

(Structure) As shown in FIG. 1, an endoscope apparatus 1 according to this embodiment is detachably connected to an endoscope 2 for observing a target site in a lumen. And a battery type light source device 5 that is used.

The endoscope 2 has an elongated insertion portion 11, an operation portion 12 also provided at a rear end of the insertion portion 11 and serving as a grip portion, and an eyepiece formed at a rear end of the operation portion 12. Part 13
And the light guide cap 14 projecting from the side of the operation unit 12.
The connection base 15 of the battery type light source device 5 can be detachably connected to the end portion of the light guide base 14. The light guide cap 14 may be configured to be selectively connected to the battery type light source device 5 and a light guide cable (not shown) so as to be connected to a light source device for commercial power source (not shown).

As shown in FIG. 2, the battery type light source device 5 comprises a lamp unit 20 and a battery unit 21, and the lamp unit 20 is loaded with a lamp 23 which emits illumination light held by a lamp holder 22. The battery unit 21 is equipped with a battery 24 that supplies power.

The battery 24 is, for example, a rechargeable nickel-metal hydride battery or a lithium battery. The battery 24 is charged into the battery unit 21 and then loaded into the battery unit 21. The power of the battery 24 is supplied to the circuit 31 (see FIG. 3), and a voltage for lighting the lamp 23 is supplied by the internal circuit 31 to illuminate the endoscope 2 through the connection base 15. It is configured to supply.

As shown in FIG. 3, the internal circuit 31 includes a rotary switch mechanism 32 for controlling lighting (ON / OFF control) of the lamp 23 by rotating the battery unit 21 around the lamp unit 20, and a battery. DC / DC converter 33 that boosts the voltage from 24 to supply the voltage to lamp 23, coil 34 that stores the power supplied from battery 24 as energy by the switching operation of DC / DC converter 33, and battery 24 A low-impedance capacitor 35 that absorbs the noise of the generated voltage as a filter, a diode 36 that performs a switching operation that discharges the energy stored in the coil 34 to the lamp 23 side as electrical energy, and a feedback unit of the DC / DC converter 33. Voltage dividing resistor 38 constituting 37,
39, a smoothing capacitor 40 that supplies a stable voltage from the diode 36, and a protection circuit 41 that shuts down the DC / DC converter 33. The protection circuit 41 monitors the voltage input to the IN terminal, DC /
A booster circuit using a DC converter 33 boosts the supply voltage from the battery 24 and supplies the boosted voltage to the lamp 23.

FIG. 4 is a graph showing changes with time in the input voltage and the input current supplied from the battery 24 to the internal circuit 31. The input voltage decreases with time and the input current increases with time. It shows that you are going.

The DC / DC converter 33 is composed of an IC, and as shown in FIG. 5, an IC power supply circuit 51 as a power supply for the IC, a reference generation circuit 52 for generating a reference signal, and a clock (CK). Clock generation circuit 53 and FB signal generation circuit 5 that generates an FB signal
4 and a control circuit 57 for controlling the ON / OFF switching operation of the P-channel FET 55 and the N-channel FET 56 based on the signals generated from each block.

Each input pin of the DC / DC converter 33 receives a power supply pin from the output side of the internal circuit and a voltage from the IC power supply circuit 51 as a threshold voltage, and Hi and LOW are inputted from the voltage. The reference signal is turned on and off via the logic circuit 58 and the reference signal to the control circuit unit 57, that is, DC.
ON terminal for turning on / off the / DC converter, and I
The voltage from the C power supply circuit 51 is set to the threshold voltage,
When Hi and Low are input from the voltage, the logic circuit 59
Hi and Low outputs are input to the control circuit unit 57 via
The voltage from the select (SEL) terminal for selecting pulse width modulation (PWM) or frequency modulation (PFM) and the feedback unit 37 outside the DC / DC converter 33 is FB.
The control circuit 5 receives the FB signal as input to the signal generator 54.
It is composed of an FB terminal input to 7, a POUT pin serving as a source of a P-channel FET 55 which is a MOS type FET and a P drain terminal of a drain, and a GND pin serving as a source of the N channel FET 56 and an N drain terminal of a drain. There is.

The DC / DC converter 33 has N channel OFF and N channel ON when the P channel is ON.
At this time, the P channel is turned off and P from the control circuit unit 57
The switching is performed by a pulse signal controlled by WM or PFM.

Here, the ON terminal and the SEL terminal output the logic circuit 58, and the logic circuit 58 outputs High when the input signal is High, and the shot down or high power P is performed.
The logic is such that the WM operates, but it goes without saying that the operation switching between High and Low can be adjusted depending on the logic setting.

The protection circuit 41 is composed of a reset IC, and as shown in FIG. 6, a comparator 61 which is a comparing means for monitoring the voltage of the input (IN) terminal and comparing it with a set voltage (reference), and an output of the comparator 61. The transistor 62 is configured to include a pull-up resistor 63 and a transistor 62 that is switched on and off depending on the state and outputs from an output (OUT) terminal to an ON terminal of the DC / DC converter 33. However, here, although an example of an output generally called an open collector output type is shown, a MOS type FE
There is no problem in using T.

FIG. 7 shows an internal circuit when the PWM of the control circuit 57 is selected. When PWM is selected from the SEL terminal, it operates at a fixed frequency generated by the clock generation circuit 53. The PWM control circuit includes a comparator 110 that monitors the current flowing through the N-channel FET 56, a multi-comparator 111 that compares the input FB signal, REF signal, and current value, and a flip-flop (FF) 112.

When the PWM operation is selected from the SEL terminal, the CK signal input from the clock generation circuit 53 operates at a fixed frequency.

The rising edge of the CK signal is FF112
Is set, and the N-channel FET 56 is turned on via the logic. Next, the multi-comparator 111 compares the input signals, resets the FF 111 via logic, and turns off the N-channel FET 56. Comparator 11
0 is a current limit, which detects an overcurrent and limits the current. The PWM operation is performed by the above configuration and action.

FIG. 8 shows the internal circuit of the PFM control of the control circuit 57. A comparator 114 that limits the current of the N-channel FET 56, a comparator 113 that compares each input signal, a flip-flop (FF) 116 that controls each channel, and a comparator 117 that monitors the current flowing in the P-channel FET 55. And a flip-flop (FF) 115 that controls the set signal from the comparator 113 by the output of the comparator 117. However, the set value of the current limit at the PFM is set lower than the set value of the current limit described in the circuit showing the PEM operation. When the PFM mode is selected from the SEL terminal and the output voltage monitored by the FB terminal goes out of the regulation range,
The comparator 113 sets the FF 116 and turns on the N-channel FET 56. When the fixed amount of energy stored in the coil 34 is stored by limiting the current flowing through the N-channel FET 56, the FET 114 is turned on by the comparator 114.
6 is reset, the N-channel FET 56 is turned off, and P
The channel FET 55 is turned on.

At that time, the comparator 117 does not input a signal to the FF 115 until the current of the P-channel FET 55 decreases to the set value, the FF 115 prohibits the next switching cycle by the comparator 113, and the energy stored in the coil 34 is stored. Do not turn on the N-channel FET 56 until is released.

When the current of the P-channel FET 55 decreases to the set value, a signal is input from the comparator 117 to the FF 117 and the prohibited switching cycle is released. The above operation enables low current operation with frequency modulation.

(Operation) The operation of the present embodiment having such a configuration will be described. The battery type light source device 5 with the battery 24 loaded is attached to the endoscope 2, and the distal end portion of the insertion portion 11 is inserted into an observation site and used for endoscopic examination.

The battery unit 21 is replaced with the lamp unit 2
The rotary switch mechanism 32 is turned on by the rotating operation of rotating it around 0. As a result, in the internal circuit 31,
The voltage supplied from the battery 24 is boosted by the switching operation of the DC / DC converter 33, and a voltage that provides optimum brightness is supplied to the lamp 23.

The switching operation of the DC / DC converter 33 is as follows. First, when the N-channel FET 56 is turned on, the N-channel FET 56 is connected to GND, the voltage between the coil 34 and the diode 36 becomes 0 V, and the current flowing through the coil 34 becomes linear. Energy, and energy can be stored in the magnetic field. At this time, the diode 36 has a reverse voltage and no current flows to the output side.

Second, the N-channel FET 56 of the DC / DC converter 33 is turned off and the P-channel FET 56 is turned on.
When 55 is turned on, the voltage across the diode 36 is changed, the voltage across the coil 34 is reversed, and the current flowing through the diode 36 and the P-channel FET 55 causes the energy stored in the coil 34 to flow to the lamp 23. Boost by.

In the DC / DC converter 33, when the ON terminal is set to Low, the reference signal is input from the reference generation circuit 52 to the control circuit unit 57 via the logic circuit 58, the CK signal is generated from the CK generation circuit 53, and selected. By switching Hi / Low of the (SEL) terminal, the output from the logic circuit 59 is input to the control circuit 57, and the pulse width modulation (PWM) operating at the maximum output and the frequency modulation (PFM) operating in the low power mode are operated. Switch over.

The voltage from the voltage dividing resistors 38 and 39 forming the FB voltage setting feedback section 37 connected to the outside of the DC / DC converter 33 is input, and the FB signal is sent from the FB signal generating circuit 54 to the control circuit section. 57 is input. The IC power supply circuit 51 is connected to each generation circuit,
The above operation is performed.

The signals input to the control circuit unit 57 from the respective generation circuits are compared inside the control circuit unit 57 and P
A constant output voltage is supplied to the lamp 23 by modulating the switching pulse width and frequency of the channel FET 16 and the N-channel FET 17.

As shown in FIG. 4, the battery 24 is exhausted as time passes during the endoscopic examination, and the voltage of the battery 24 sharply drops after a certain period of time. However, since the DC / DC converter 33 continues to supply the constant voltage set on the output side by the PWM operation, the input current rapidly increases as the voltage of the battery 24 drops. Therefore, stress is applied to the DC / DC converter 33 of the internal circuit 31.

In the present embodiment, the protection circuit 41 uses a reset IC. As shown in FIG. 6, when the voltage drop of the battery 24 is detected and the voltage drops below a certain voltage (REF), the comparator 61 is detected. Output goes low, transistor 62 turns off, output goes high, and DC
It is output to the ON terminal of the / DC converter 33.

By switching the voltage of the ON terminal of the DC / DC converter 33 from Low to High, DC
/ DC converter 33 is shut down.

(Effect) As described above, in this embodiment, the protection circuit 41 detects the voltage drop of the battery 24 and shuts down the DC / DC converter 33 when the voltage drops below a certain voltage (REF). The stress on the / DC converter 33 can be eliminated.

Further, by shutting down the DC / DC converter 33, the loss of the power supply line from the battery 24 to the output side can be minimized and the internal circuit 31 can be protected.

That is, the power line loss is DC / DC
The boosting efficiency of the converter 33 is greatly affected, and the battery 24
Needless to say, the duration of time is affected, but in the present embodiment, due to the above operation, stable boosting is performed, the energy of the battery 24 can be used without waste, and the internal circuit 3
1 can be protected.

9 to 11 relate to the second embodiment of the present invention, FIG. 9 is a block diagram showing the configuration of an internal circuit provided in the battery type light source device, and FIG. 10 is a battery using the internal circuit of FIG. FIG. 11 is a waveform diagram showing the voltage drop due to the passage of time, and FIG. 11 is a waveform diagram of the blinking signal output from the CPU of FIG.

Since the second embodiment is almost the same as the first embodiment, only different points will be described, the same components will be denoted by the same reference numerals, and description thereof will be omitted.

FIG. 9 shows a circuit diagram of the second embodiment, in which the CPU 71 detects the voltage of the battery 3 on the input side,
When the voltage becomes lower than a certain voltage, the CPU 71 causes FET7
A blinking signal (High, Low
Output).

The CPU 71 is composed of a detection terminal for detecting the voltage of the battery 24, a power supply terminal, a GND terminal, and an output terminal for outputting a blinking signal to the FET 72.

Further, the feedback section 3 of the present embodiment
Reference numeral 7 is composed of voltage dividing resistors 73a, 73b and 73c, and when the FET 72 is repeatedly turned on and off, D
The voltage dividing resistance of the feedback unit 37 of the C / DC converter 33 is changed, and the two types of set voltages are alternately supplied to the lamp 23 so that the lamp blinks.

FIG. 10 is a graph showing the voltage drop of the battery 24 with the passage of time. Before the shutdown shown in the first embodiment is performed, a blinking time of the lamp is set so that the surgeon can make a battery charge. It means to announce the consumption of.

FIG. 11 shows a blinking signal from the CPU 71. In normal use, in this embodiment, it is High.
With the (H) output, the FET 72 is turned on, and the higher output voltage is output as the output voltage. When the CPU 71 detects the set voltage, High (H), Low (L)
A pulse signal for sequentially switching is generated, and when it is High, the FET 72 is turned on and the higher output voltage, and when it is Low, the FET 72 is turned off and the voltage dividing resistor 73c is added to obtain the lower output voltage.

The pulse signal from the CPU 71 is DC / DC
It is output until the converter 33 shuts down, and at the same time as the shutdown, the boosting is stopped, the power supply voltage of the CPU 71 is insufficient, and the CPU 71 is also turned off. Other configurations are the same as those in the first embodiment.

(Operation) With the above configuration, the battery 24 is consumed during the endoscopic inspection, the voltage of the battery 24 becomes low during the endoscopic inspection, and the CPU 71 causes the DC / DC converter 33 to operate.
When a voltage higher than the shutdown voltage of 7 is detected, a blinking signal is output to the FET 72, a lamp blinks during observation to notify the operator of the exhausted state of the battery 24, and after blinking for a certain period of time, the DC / DC converter Shut down 33. Other functions are the same as those in the first embodiment.

(Effect) As described above, in this embodiment, in addition to the effects of the first embodiment, in the first embodiment, the output voltage depends on the PWM of the DC / DC converter 5 or the PFM operation. Since a constant voltage is supplied, the brightness of the lamp 11 does not change so much, and if the voltage of the battery 24 becomes low during use in endoscopy, the battery shuts down abruptly during observation. In the form, the lamp can be blinked during observation to notify the operator of the exhausted state of the battery 24.

12 and 13 relate to the third embodiment of the present invention. FIG. 12 is a block diagram showing the configuration of an internal circuit provided in the battery type light source device, and FIG. 13 is a function of the internal circuit of FIG. FIG. 6 is a waveform diagram for explaining FIG.

Since the third embodiment is almost the same as the first embodiment, only different points will be described, the same components will be denoted by the same reference numerals, and description thereof will be omitted.

(Structure) In this embodiment, as shown in FIG. 12, the output (OUT) terminal of the protection circuit 41 is DC /
The DC / DC converter 33 is connected to the SEL terminal instead of the ON terminal.
The logic output is input to the control circuit unit 57 by the High and Low signals input to the terminal, and the PWM and PFM modes can be selected. Other configurations are the same as those in the first embodiment.

(Operation) In the present embodiment, the protection circuit 41
Detects the voltage drop of the battery 24 and detects a certain voltage (RE
F), the SE of the DC / DC converter 33
By switching the voltage of the L terminal from High to Low, the DC / DC converter 33 is set to P in the maximum output mode.
Switch from WM operation to PFM operation in low power mode.

FIG. 13A shows the time variation of the battery voltage of the battery 24 when the DC / DC converter 33 is shut down as shown in the first embodiment.
3 (b) shows the operation of the PWM operation in the maximum output mode to the low power mode P before the shutdown according to the present embodiment.
The time change of the battery voltage of the battery 24 in the FM operation is shown, and by switching from the PWM operation of the maximum output mode to the PFM operation of the low power mode,
It indicates that the power consumption of the battery is reduced and the lamp usage time is extended. Other functions are the same as those in the first embodiment.

(Effect) As described above, in this embodiment, in addition to the effects of the first embodiment, the voltage of the battery 24 is exhausted, a certain constant voltage is detected, and the DC / DC converter 3
The voltage of the SEL terminal of 3 is switched and P of the maximum output mode is set.
By switching from the WM operation to the PFM operation in the low power mode, the light amount of the lamp 23 can be reduced and the energy used by the battery 24 can be reduced to extend the usage time.

14 and 15 relate to the fourth embodiment of the present invention, FIG. 14 is a block diagram showing the configuration of an internal circuit provided in the battery type light source device, and FIG. 15 is the DC / DC converter of FIG. 3 is a block diagram showing the configuration of FIG.

Since the fourth embodiment is almost the same as the second embodiment, only different points will be described, the same components will be denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, as shown in FIG.
The DC / DC converter 33a capable of mode selection by current limitation is used, and the output (OUT) terminal of the protection circuit 41 is connected to the SEL terminal instead of the ON terminal of the DC / DC converter 33a here. In the converter 33a, High, L input to the SEL terminal
The current mode of power output and the burst mode of low power can be selected by the ow signal.

As shown in FIG. 15, the DC / DC converter 33a inputs the voltage signal of the feedback section 37 from the FB terminal and generates the FB signal, and the FB signal generating circuit 10 is provided.
1, a reference signal generation circuit 102 that generates a reference signal from a power supply, a comparator 103 that compares an FB signal with a reference signal, and a comparator 103
The clock generation circuit 104 generates a clock (CK) signal based on the output of the above, a transistor 105 that performs a switching operation based on the clock (CK) signal, and a current flowing from the SW terminal by switching by the transistor 105 is detected to limit the upper limit. A current detection circuit 106,
The clock generation circuit 10 is controlled by the output of the current detection circuit 106.
4 is adjusted, that is, the comparator 107 that detects an overcurrent and limits the clock signal, and the output of the current detection circuit 106 is adjusted by the external Hi and Low signals (OUT terminal output of the protection circuit 41) from the SEL terminal.
It is composed of a transistor 108 that switches the 07 and CK signals between a high power power mode and a low power burst mode. Other configurations are the same as those in the second embodiment.

(Operation) In the present embodiment, the protection circuit 41
Detects the voltage drop of the battery 24 and detects a certain voltage (RE
F), the OUT terminal output of the protection circuit 41 becomes High, and the SEL of the DC / DC converter 33a becomes high.
High is input to the terminal, the transistor 108 does not operate, the current flowing through the transistor 105 is limited, and the burst mode (low current) mode is set.

In the normal high power mode, the OUT terminal output of the protection circuit 41 is Low and the SEL terminal is GND.
The level becomes high, and a part of the output of the current detection circuit 106 flows to the transistor 108. The current flowing to the transistor 105 increases correspondingly and the current flowing from the SW terminal increases, so that the output becomes high power. Other functions are the same as those in the second embodiment.

(Effects) As described above, in this embodiment, in addition to the effects of the second embodiment, when the battery 24 is exhausted, D
Since the C / DC converter 33a is set to the low power mode (burst mode), current limitation is performed inside the DC / DC converter 33a, the output voltage is limited to reduce the light amount of the lamp 23, and the energy consumption of the battery 24 is reduced. By reducing it, the usage time can be extended.

Needless to say, if the output of the reset IC is connected to the ON terminal of the DC / DC converter 33a, the lamp can blink when the battery 24 is exhausted and then shut down.

[0065]

As described above, according to the present invention, when the capacity of the battery is exhausted, the voltage detection is performed and the booster circuit is shut down, so that the power supply circuit of the battery type light source device can be protected. effective.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an endoscope apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of the battery-type light source device of FIG.

3 is a block diagram showing a configuration of an internal circuit provided in the battery-type light source device of FIG.

FIG. 4 is a waveform diagram showing changes with time of an input voltage and an input current supplied to the internal circuit of FIG.

5 is a block diagram showing the configuration of the DC / DC converter of FIG.

6 is a block diagram showing a configuration of a protection circuit of FIG.

7 is a block diagram showing the internal configuration of the control circuit of FIG. 6 during PWM control.

8 is a block diagram showing an internal configuration of the control circuit of FIG. 6 during PFM control.

FIG. 9 is a block diagram showing a configuration of an internal circuit provided in a battery type light source device according to a second embodiment of the present invention.

FIG. 10 is a waveform diagram showing the voltage drop of a battery over time due to the internal circuit of FIG.

11 is a waveform diagram of a blinking signal output from the CPU of FIG.

FIG. 12 is a block diagram showing a configuration of an internal circuit provided in a battery type light source device according to a third embodiment of the present invention.

FIG. 13 is a waveform diagram illustrating the operation of the internal circuit of FIG.

FIG. 14 is a block diagram showing a configuration of an internal circuit provided in a battery type light source device according to a fourth embodiment of the invention.

15 is a block diagram showing the configuration of the DC / DC converter of FIG.

[Explanation of symbols]

1 ... Endoscopic device 2 ... Endoscope 5 ... Battery-type light source device 11 ... insertion part 12 ... Operation part 13 ... Eyepiece 14 ... Light guide base 15 ... Connection base 20 ... Lamp unit 21 ... Battery unit 22 ... Lamp holder 23 ... Lamp 24 ... Battery 31 ... Internal circuit 32 ... Rotary switch mechanism 33 ... DC / DC converter 34 ... Coil 35, 40 ... Capacitor 36 ... Diode 37 ... Feedback section 38, 39 ... Dividing resistance 41 ... Protection circuit 51 ... IC power supply circuit 52 ... Reference generation circuit 53 ... Clock generation circuit 54 ... FB signal generation circuit 55 ... P-channel FET 56 ... N-channel FET 57 ... Control circuit 58, 59 ... Logic circuit 61 ... Comparator 62 ... Transistor 63 ... pull-up resistor

Continuation of front page (56) Reference JP-A-11-164814 (JP, A) JP-A-7-299030 (JP, A) JP-A-5-159885 (JP, A) JP-A-11-192207 (JP , A) JP 9-308608 (JP, A) JP 7-325633 (JP, A) JP 11-136929 (JP, A) JP 10-14217 (JP, A) JP 6-351156 (JP, A) JP 2000-56239 (JP, A) JP 3-118758 (JP, A) Actual development Sho 53-72436 (JP, U) (58) Fields investigated (Int.Cl) . ⁷ , DB name) A61B 1/00-1/32 H02M 3/00-3/44

Claims (3)

(57) [Claims] 1. An endoscope having a light guide capable of guiding illumination light, an illumination lamp for supplying illumination light to an illumination light incident end of the light guide, and electric power for driving the illumination lamp. A battery-type light source device that has a power supply circuit that boosts the voltage of a battery and supplies electric power to the illumination lamp, and is detachably attached to the endoscope; a detection unit that detects a consumed state of the battery; An endoscope apparatus comprising: a protection circuit that shuts down and protects the power supply circuit based on a detection result of the means. 2. The endoscope apparatus according to claim 1, further comprising a notifying unit for notifying a consumed state of the battery before the protection circuit shuts down the power supply circuit. 3. An endoscope having a light guide capable of guiding illumination light, an illumination lamp for supplying illumination light to an illumination light incident end of the light guide, and a battery capable of supplying power to the illumination lamp. /> and the battery-type light source device provided detachably to said endoscope and a re, a detecting means for detecting a predetermined power consumption state of the battery, the supply of feed provided the power of the battery to the illumination lamp means and, based on a detection result of said detecting means, a first state the first Jo state of the light amount of the illumination light of the illumination lamp alternately
An endoscope apparatus comprising: a control unit configured to control the second state to be repeated as a second state different from the first state.