JP3772153B2 - Endoscope device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope apparatus, and more particularly to an endoscope apparatus characterized by a power supply circuit portion of a battery-type light source device that is detachably attached to the endoscope.
[0002]
[Prior art]
At present, endoscope apparatuses are widely used in the medical field and the industrial field. In this endoscope apparatus, since the diagnostic or examination target part is inside a living body or inside a plant, equipment, etc., means for illuminating these examination target parts is necessary. For this reason, in a general endoscope apparatus, a light source device is prepared as an external device of the endoscope, and a light provided in the endoscope with illumination light from a light source lamp attached to a light source unit in the light source device The light is guided to the guide fiber, and the illumination light guided by the light guide fiber is emitted from the illumination window on the distal end side of the insertion portion to illuminate the inspection target part.
[0003]
The light source device generally turns on a light source lamp inside the light source device using a power source supplied from a commercial power source.
[0004]
On the other hand, for example, in an endoscope apparatus described in Japanese Patent Laid-Open No. 10-224926, a battery-type light source device using a battery such as a dry battery as a power source is detachably attached to an operation unit of the endoscope. Is. Such an endoscope device in which the battery-type light source device is detachably attached to the operation unit is easy to carry and can be used in places where there is no power source, so it is suitable for use in an emergency or outdoors. ing.
[0005]
In the battery-type light source device, the voltage supplied to the lamp in the device boosts the battery voltage and supplies the lamp with an optimal and constant output voltage. Therefore, when the battery is consumed and the battery voltage drops, the output voltage In order to keep the current constant, the input current has to be increased, and the circuit is stressed. Therefore, as the protection circuit, a method of detecting the current and switching off using the FET is generally used, as used in the protection circuit of the lithium ion battery.
[0006]
[Problems to be solved by the invention]
However, in a protection circuit that detects current and switches off using an FET, there is a problem that the loss of current detection resistance and the ON resistance of the FET becomes large and the battery energy cannot be used efficiently. is there.
[0007]
The present invention has been made in view of the above circumstances. When the capacity of the battery is exhausted, the voltage is detected and the booster circuit is switched to the low power mode, thereby reducing the power consumption of the battery and using the lamp. An object of the present invention is to provide an endoscope apparatus capable of extending the time.
[0008]
[Means for Solving the Problems]
An endoscope apparatus according to the present invention includes an endoscope having a light guide capable of guiding illumination light, an illumination lamp capable of supplying illumination light to an illumination light incident end of the light guide, and driving the illumination lamp A battery-type light source device that is detachably provided on the endoscope, and is provided in the battery-type light source device, boosts the voltage of the battery and supplies power to the illumination lamp. A power supply circuit comprising: a first operation mode that can be supplied; and a second operation mode in which the voltage of the battery can be boosted with less power than the first operation mode and power can be supplied to the illumination lamp; It is characterized by comprising detection means for detecting a depletion state of the battery and operation control means for controlling the operation mode of the power supply circuit based on the detection result of the detection means.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
Prior to describing an embodiment of the present invention, an example serving as a reference for the embodiment will be described.
[0011]
First, a first example (first reference example) serving as a reference for the embodiment will be described.
[0012]
1 to 8 relate to a first reference example of the present invention, FIG. 1 is a configuration diagram showing a configuration of an endoscope apparatus, FIG. 2 is a configuration diagram showing a configuration of the battery type light source device of FIG. 1, and FIG. FIG. 4 is a block diagram showing the configuration of an internal circuit provided in the battery type light source device of FIG. 2, FIG. 4 is a waveform diagram showing temporal changes in input voltage and input current supplied to the internal circuit of FIG. 3, and FIG. FIG. 6 is a block diagram showing the configuration of the protection circuit of FIG. 3, FIG. 7 is a block diagram showing the internal configuration during PWM control of the control circuit of FIG. 6, and FIG. FIG. 7 is a block diagram showing an internal configuration during PFM control of the control circuit of FIG. 6.
[0013]
(Constitution)
As shown in FIG. 1, an endoscope apparatus 1 according to a first reference example includes an endoscope 2 for observing a target site in a lumen, and a battery-type light source that is detachably connected to the endoscope 2. The apparatus 5 is comprised.
[0014]
The endoscope 2 includes an elongated insertion portion 11, an operation portion 12 that also serves as a grip portion provided at the rear end of the insertion portion 11, and an eyepiece portion 13 formed at the rear end of the operation portion 12. A light guide base 14 projecting from the side of the operation unit 12, and a connection base 15 of the battery-type light source device 5 can be detachably connected to an end of the light guide base 14. . The light guide base 14 may be configured to be connected to a light source device for commercial power source (not shown) by selectively connecting a light guide cable (not shown) to the battery type light source device 5.
[0015]
As shown in FIG. 2, the battery-type light source device 5 includes a lamp unit 20 and a battery unit 21. The lamp unit 20 is loaded with a lamp 23 that emits illumination light held by a lamp holder 22, and the battery unit. A battery 24 for supplying power is loaded in 21.
[0016]
The battery 24 is, for example, a rechargeable nickel-metal hydride battery or a lithium battery, and after charging the battery 24, the battery 24 is loaded into the battery unit 21, thereby providing an internal circuit 31 (described later) provided in the battery-type light source device 5. 3), the battery 24 is supplied with power, the internal circuit 31 supplies a voltage for turning on the lamp 23, and the illumination light is supplied to the endoscope 2 through the connection base 15. It has become.
[0017]
As shown in FIG. 3, the internal circuit 31 includes a rotary switch mechanism 32 that performs lighting control (on / off control) of the lamp 23 by rotating the battery unit 21 around the lamp unit 20, and a battery 24 A DC / DC converter 33 that boosts the voltage and supplies the voltage to the lamp 23, a coil 34 that stores power supplied from the battery 24 by the switching operation of the DC / DC converter 33 as energy, and a voltage supplied from the battery 24 The low-impedance capacitor 35 that absorbs the noise as a filter, the diode 36 that performs the switching operation for discharging the energy stored in the coil 34 to the lamp 23 side as electric energy, and the feedback unit 37 of the DC / DC converter 33 are configured. The voltage divider resistors 38 and 39 and the diode 36 And a protective circuit 41 for shutting down the DC / DC converter 33. The protective circuit 41 monitors the voltage input to the IN terminal and uses the DC / DC converter 33. The boosting circuit boosts the supply voltage from the battery 24 and supplies it to the lamp 23.
[0018]
FIG. 4 is a graph showing changes in the input voltage and input current supplied from the battery 24 to the internal circuit 31 with time. The input voltage decreases with time and the input current increases with time. Is shown.
[0019]
The DC / DC converter 33 is composed of an IC. As shown in FIG. 5, an IC power supply circuit 51 serving as a power supply for the IC, a reference generation circuit 52 for generating a reference signal, and a clock generation circuit for generating a clock (CK). 53, an FB signal generation circuit 54 for generating an FB signal, and a control circuit 57 for controlling on / off switching operations of the P-channel FET 55 and the N-channel FET 56 based on the signals generated from the respective blocks. ing.
[0020]
Each input pin of the DC / DC converter 33 is a logic circuit when a power supply pin to which power is input from the output side of the internal circuit and a voltage from the IC power supply circuit 51 are set as threshold voltages, and Hi and LOW are input from the voltages. The reference signal is input to the control circuit unit 57 by turning ON / OFF the reference generation via 58, that is, the ON terminal that turns ON / OFF the DC / DC converter, and the voltage from the IC power supply circuit 51 is made a threshold voltage, and the voltage When Hi and Low are input, Hi and Low outputs are input to the control circuit unit 57 via the logic circuit 59, and a select (SEL) terminal for selecting pulse width modulation (PWM) or frequency modulation (PFM), The voltage from the feedback unit 37 outside the DC / DC converter 33 is input to the FB signal generation unit 54 and the FB signal is output. FB terminal input to the control circuit 57, POUT pin and drain P drain terminal serving as the source of the P-channel FET 55 which is a MOS type FET, GND pin and drain N drain terminal serving as the source of the N-channel FET 56 It is configured.
[0021]
The DC / DC converter 33 is configured to switch the P channel OFF by a PWM or PFM-controlled pulse signal from the control circuit unit 57 when the P channel is ON, the N channel is OFF, and the N channel is ON.
[0022]
Here, when the input signal is High, the ON terminal and the SEL terminal are logics that the logic circuit 58 and logic circuit 58 output High and perform a shot down or high power PWM operation, but depending on the logic setting, the High, Needless to say, the operation switching by Low can be adjusted.
[0023]
The protection circuit 41 includes a reset IC, and as shown in FIG. 6, the comparator 61 is a comparison unit that monitors the voltage of the input (IN) terminal and compares it with a set voltage (reference), and is turned on by the output state of the comparator 61. , OFF switching and a transistor 62 that outputs from the output (OUT) terminal to the ON terminal of the DC / DC converter 33, and a pull-up resistor 63. However, although an example of an output generally called an open collector output type is shown here, there is no problem even if a MOS type FET is used.
[0024]
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.
[0025]
When the PWM operation is selected from the SEL terminal, it operates at a fixed frequency by the CK signal input from the clock generation circuit 53.
[0026]
The rising edge of the CK signal is set to FF112, and the N-channel FET 56 is turned on via logic. Next, the multi-comparator 111 compares the inputted signals, resets the FF 111 via logic, and the N-channel FET 56 is turned off. The comparator 110 is a current limit, detects an overcurrent, and limits the current. The PWM operation is performed by the above configuration and operation.
[0027]
FIG. 8 shows an internal circuit of 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 through the P-channel FET 55. And a flip-flop (FF) 115 that controls the set signal from the comparator 113 based on the output of the comparator 117. However, the set value of the current limit during 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, the comparator 113 sets the FF 116 and turns on the N-channel FET 56 when the output voltage monitored by the FB terminal is out of the regulation range. When the current flowing through the N-channel FET 56 is limited and a fixed amount of energy stored in the coil 34 is stored, the comparator 114 resets the FET 116 to turn off the N-channel FET 56 and turn on the P-channel FET 55.
[0028]
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, and the FF 115 prohibits the next switching cycle by the comparator 113 and the energy stored in the coil 34 is released. The N-channel FET 56 is not turned ON until
[0029]
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. By the above operation, a low current operation in which the frequency is modulated becomes possible.
[0030]
(Function)
The operation of the first reference example configured as described above will be described. A battery-type light source device 5 loaded with a battery 24 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.
[0031]
The rotary switch mechanism 32 is turned on by a rotating operation for rotating the battery unit 21 around the lamp unit 20. As a result, in the internal circuit 31, the supply voltage 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.
[0032]
The switching operation of the DC / DC converter 33 is firstly connected to GND when the N-channel FET 56 is turned on, the voltage between the coil 34 and the diode 36 becomes 0V, and the current flowing through the coil 34 increases linearly. 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.
[0033]
Second, when the N-channel FET 56 of the DC / DC converter 33 is turned off and the P-channel FET 55 is turned on, the voltage across the diode 36 is changed, the voltage across the coil 34 is reversed, and the current flows between the diode 36 and the P-channel. The voltage is boosted when the energy stored in the coil 34 flows to the lamp 23 through the FET 55.
[0034]
When the ON terminal is set to Low, the DC / DC converter 33 inputs a reference signal from the reference generation circuit 52 to the control circuit unit 57 via the logic circuit 58, generates a CK signal from the CK generation circuit 53, and selects (SEL). By switching the terminal Hi / Low, the output from the logic circuit 59 is input to the control circuit 57, and switching between pulse width modulation (PWM) operating at the maximum output and frequency modulation (PFM) operating at the low power mode is performed. .
[0035]
The voltage from the voltage dividing resistors 38 and 39 constituting the feedback unit 37 of the FB voltage setting connected to the outside of the DC / DC converter 33 is input, and the FB signal is input from the FB signal generation circuit 54 to the control circuit unit 57. Is done. The IC power supply circuit 51 is connected to each generation circuit and performs the above operation.
[0036]
Signals input from the respective generation circuits to the control circuit unit 57 are compared inside the control circuit unit 57, and the pulse width and frequency of switching of the P-channel FET 16 and the N-channel FET 17 are modulated to obtain a constant output voltage. Supply to the lamp 23.
[0037]
As shown in FIG. 4, the battery 24 is consumed as the in-use time elapses in the endoscopic examination, and the voltage of the battery 24 rapidly decreases after a certain period of time. However, since the DC / DC converter 33 continues to supply a 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.
[0038]
In the first reference example, the protection circuit 41 uses a reset IC. As shown in FIG. 6, when the voltage drop of the battery 24 is detected and becomes lower than a certain voltage (REF), the output of the comparator 61 is output. Becomes Low, the transistor 62 is turned OFF, the output becomes High, and is output to the ON terminal of the DC / DC converter 33.
[0039]
The DC / DC converter 33 is shut down by switching the voltage of the ON terminal of the DC / DC converter 33 from Low to High.
[0040]
(effect)
Thus, in the first reference example, 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). Such stress can be eliminated.
[0041]
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.
[0042]
In other words, the loss of the power supply line greatly affects the boosting efficiency of the DC / DC converter 33 and affects the duration of the battery 24. Therefore, the energy of the battery 24 can be used without waste and the internal circuit 31 can be protected.
[0043]
9 to 11 relate to a second reference example related to the embodiment of the present invention, FIG. 9 is a block diagram showing a configuration of an internal circuit provided in the battery type light source device, and FIG. 10 is a block diagram of a battery by the internal circuit of FIG. FIG. 11 is a waveform diagram showing a blinking signal output from the CPU of FIG. 9.
[0044]
Since the second reference example is almost the same as the first reference example, only different points will be described, and the same reference numerals will be given to the same components and description thereof will be omitted.
[0045]
FIG. 9 shows a circuit diagram of the second reference example. When the voltage of the battery 3 on the input side is detected by the CPU 71 and becomes lower than a certain voltage, the CPU 71 causes the FET 72 to turn on and off repeatedly (High, Low output) is input.
[0046]
The CPU 71 includes a detection terminal that detects the voltage of the battery 24, a power supply terminal, a GND terminal, and an output terminal that outputs a blinking signal to the FET 72.
[0047]
Further, the feedback unit 37 of the second reference example is configured by voltage dividing resistors 73a, 73b, 73c, and the voltage dividing resistor of the feedback unit 37 of the DC / DC converter 33 is obtained when the FET 72 is repeatedly turned on and off. Is changed, and two kinds of set voltages are alternately supplied to the lamp 23, whereby the lamp blinks.
[0048]
FIG. 10 is a graph showing a voltage drop over time of the battery 24. Before the shutdown shown in the first reference example is performed, a lamp blinking time is provided to notify the operator of battery consumption. Represents what to do.
[0049]
FIG. 11 shows a blinking signal from the CPU 71. During normal use, in the first reference example, the FET 72 is turned on with a High (H) output, and the output voltage with the higher set voltage is output. Yes. When the CPU 71 detects the set voltage, it generates a pulse signal for sequentially switching between High (H) and Low (L). When it is High, the FET 72 is turned on and the output voltage is higher, and when it is Low, the FET 72 is turned off. A voltage dividing resistor 73c is added to obtain a lower output voltage.
[0050]
The pulse signal from the CPU 71 is output until the DC / DC converter 33 is shut down, and at the same time as the shutdown, there is no boost, 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 of the first reference example.
[0051]
(Function)
With the above configuration, when the battery 24 is consumed during the endoscopic examination, the voltage of the battery 24 is lowered during use in the endoscopic examination, and the CPU 71 detects a voltage that is somewhat higher than the shutdown voltage of the DC / DC converter 33. The blinking signal is output to the FET 72, the lamp blinks during observation, the operator is informed of the exhausted state of the battery 24, blinks for a certain period, and then the DC / DC converter 33 is shut down. Other operations are the same as those of the first reference example.
[0052]
(effect)
As described above, in the second reference example, in addition to the effect of the first reference example, in the first reference example, the output voltage is supplied with a constant voltage by PWM or PFM operation of the DC / DC converter 5. Therefore, the brightness of the lamp 11 does not change so much, so if the voltage of the battery 24 becomes low during use in an endoscopic examination, it will shut down suddenly during observation, but in the second reference example, Blinks to inform the operator of the exhausted state of the battery 24.
[0053]
Next, an embodiment of the present invention will be described.
[0054]
12 and 13 relate to one 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 waveform diagram for explaining the operation of the internal circuit of FIG. It is.
[0055]
The configuration of the present embodiment is almost the same as that of the first reference example described above, and only different points will be described here, and the same components are denoted by the same reference numerals and description thereof will be omitted.
[0056]
(Constitution)
In the present embodiment, as shown in FIG. 12, 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 33. In the DC / DC converter 33, the SEL terminal The logic output is input to the control circuit unit 57 by the High and Low signals input to the terminals, so that the PWM or PFM mode can be selected. Other configurations are the same as those of the first reference example.
[0057]
(Function)
In the present embodiment, when the protection circuit 41 detects a voltage drop of the battery 24 and becomes lower than a certain voltage (REF), the voltage of the SEL terminal of the DC / DC converter 33 is switched from High to Low, so that the DC The DC converter 33 is switched from the PWM operation in the maximum output mode to the PFM operation in the low power mode.
[0058]
FIG. 13 (a) shows the time change of the battery voltage of the battery 24 when the DC / DC converter 33 is shut down as shown in the first reference example, and FIG. 13 (b) is according to the present embodiment. It shows the time change of the battery voltage of the battery 24 when the PWM operation in the maximum output mode is changed to the PFM operation in the low power mode before performing the shutdown, and from the PWM operation in the maximum output mode to the PFM operation in the low power mode. It shows that by switching, the power consumption of the battery is reduced and the usage time of the lamp is extended. Other operations are the same as those of the first reference example.
[0059]
(effect)
As described above, in this embodiment, the voltage of the battery 24 is consumed, a certain voltage is detected, the voltage of the SEL terminal of the DC / DC converter 33 is switched, and the PWM operation in the maximum output mode is changed to the PFM in the low power mode. By switching to the operation, the usage time can be extended by reducing the light amount of the lamp 23 and reducing the energy used by the battery 24.
[0060]
14 and 15 relate to a third reference example of the above embodiment, FIG. 14 is a block diagram showing a configuration of an internal circuit provided in the battery type light source device, and FIG. 15 is a configuration of the DC / DC converter of FIG. FIG.
[0061]
Since the third reference example is almost the same as the second reference example, only different points will be described, and the same components are denoted by the same reference numerals and description thereof will be omitted.
[0062]
In the reference example of the third case, as shown in FIG. 14, a DC / DC converter 33a capable of mode selection by current limitation is used, and the output (OUT) terminal of the protection circuit 41 is ON of the DC / DC converter 33a here. The DC / DC converter 33a is capable of selecting a power output current mode and a low-power burst mode according to a High / Low signal input to the SEL terminal. .
[0063]
As shown in FIG. 15, the DC / DC converter 33a receives the voltage signal of the feedback unit 37 from the FB terminal and generates an FB signal, and a reference signal generation circuit 102 that generates a reference signal from a power source. A comparator 103 that compares the FB signal with the reference signal, a clock generation circuit 104 that generates a clock (CK) signal based on the output of the comparator 103, a transistor 105 that performs a switching operation based on the clock (CK) signal, and a transistor 105 The current flowing from the SW terminal by switching according to the current detection circuit 106, the current detection circuit 106 that limits the upper limit, and the comparator 107 that adjusts the clock generation circuit 104 by the output of the current detection circuit 106, that is, detects the overcurrent and limits the clock signal When A transistor 108 that adjusts the output of the current detection circuit 106 by the external Hi and Low signals (OUT terminal output of the protection circuit 41) from the SEL terminal and switches the comparator 107 and the CK signal between the high power power mode and the low power burst mode. It is configured. Other configurations are the same as those of the second reference example.
[0064]
(Function)
In the third reference example, when the protection circuit 41 detects a voltage drop of the battery 24 and becomes lower than a certain voltage (REF), the OUT terminal output of the protection circuit 41 becomes High, and the SEL of the DC / DC converter 33a. High is input to the terminal, the transistor 108 does not operate, the current flowing through the transistor 105 is limited, and a burst mode (low current) mode is set.
[0065]
In the normal high power mode, the OUT terminal output of the protection circuit 41 is Low, the SEL terminal is at the GND level, a part of the output of the current detection circuit 106 flows to the transistor 108, and the current flowing to the transistor 105 correspondingly. Increased current flowing from the SW terminal increases, resulting in high power output. Other operations are the same as those of the second reference example.
[0066]
(effect)
As described above, in the third reference example, in addition to the effects of the second reference example, when the battery 24 is consumed, the DC / DC converter 33a is set in the low power mode (burst mode). The current can be limited by limiting the output voltage to reduce the amount of light from the lamp 23 and reducing the energy used by the battery 24, thereby extending the usage time.
[0067]
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 be blinked when the battery 24 is exhausted and then shut down.
[0068]
【The invention's effect】
As described above, according to the present invention, when the battery capacity is exhausted, voltage detection is performed and the booster circuit is switched to the low power mode, thereby reducing battery power consumption and extending the lamp usage time. There is an effect that can be.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of an endoscope apparatus according to a first reference example of the present invention.
2 is a configuration diagram showing the configuration of the battery-type light source device of FIG. 1;
3 is a block diagram showing a configuration of an internal circuit provided in the battery-type light source device of FIG. 2;
4 is a waveform diagram showing temporal changes in input voltage and input current supplied to the internal circuit of FIG. 3;
5 is a block diagram showing a configuration of the DC / DC converter of FIG.
6 is a block diagram showing a configuration of the protection circuit of FIG. 3;
7 is a block diagram showing an internal configuration during PWM control of the control circuit of FIG. 6;
8 is a block diagram showing an internal configuration during PFM control of the control circuit of FIG. 6;
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 reference example of the present invention.
10 is a waveform diagram showing a voltage drop over time of the battery by the internal circuit of FIG. 9;
11 is a waveform diagram of a blinking signal output from the CPU of FIG. 9;
FIG. 12 is a block diagram showing a configuration of an internal circuit provided in the battery type light source device according to the embodiment of the invention.
13 is a waveform diagram for explaining 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 third reference example of the invention.
15 is a block diagram showing the configuration of the DC / DC converter of FIG. 14;
[Explanation of symbols]
1. Endoscope device
2. Endoscope
5 ... Battery type light source device
11 ... Insertion part
12 ... operation part
13 ... Eyepiece
14 ... Light guide cap
15 ... Connection base
20: Lamp unit
21 ... Battery unit
22 ... Lamp holder
23 ... Ramp
24 ... Battery
31 ... Internal circuit
32 ... Rotary switch mechanism
33 ... DC / DC converter
34 ... Coil
35, 40 ... Capacitors
36 ... Diode
37 ... Feedback section
38, 39 ... Divider 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

Claims (1)

An endoscope having a light guide capable of guiding illumination light;
A battery-type light source device having an illumination lamp capable of supplying illumination light to an illumination light incident end of the light guide and a battery capable of generating electric power for driving the illumination lamp, and is detachably provided on the endoscope When,
A first operation mode provided in the battery-type light source device, capable of boosting the voltage of the battery and supplying power to the illumination lamp; and boosting the voltage of the battery with lower power consumption than the first operation mode. A power supply circuit having a second operation mode capable of supplying power to the illumination lamp;
Detecting means for detecting a depleted state of the battery;
Operation control means for controlling the operation mode of the power supply circuit based on the detection result of the detection means;
An endoscope apparatus characterized by comprising:

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