Endoscope light source device and endoscope system

Abstract

The utility model provides an endoscope light source device and endoscope system.The endoscope light source device comprises a light machine module and a constant power control panel, the light machine module comprises a light machine shell, a light source emitting plate and a light source receiving plate, the light source emitting plate and the light source receiving plate are arranged on the light machine shell, and the constant power control panel is connected with the light source emitting plate and the light source receiving plate. The light source emitting plate is driven to emit light based on a received current signal, the light source receiving plate obtains part of light signals and converts the light signals into voltage feedback signals, and the constant power control plate receives the voltage feedback signals and adjusts the input current of the light source emitting plate based on the voltage feedback signals, so that constant power adjustment is achieved. The size of the current signal is indirectly determined by obtaining the size of the light signal, feedback adjustment is achieved, the accuracy of current control is improved, and then it is guaranteed that light emitted by the endoscope light source device is constant.

Description

Technical Field

[0001] This utility model belongs to the field of endoscope technology, and particularly relates to an endoscope light source device and an endoscope system. Background Technology

[0002] An endoscope system mainly consists of an endoscope light source device, an electronic endoscope, and an image processor. The endoscope light source device generates illumination, which is then transmitted through a medium within the electronic endoscope onto the specimen. The endoscope's imaging unit captures the specimen's signals and generates image information, which is transmitted to the image processor for further processing and display. With the development of LEDs, endoscope light source devices often choose LEDs as their light source. In endoscope applications, when the distance between the endoscope and the tissue being examined is constant, it is necessary to ensure a constant LED light output for image observation. Traditional LED driving methods primarily use constant current control circuits to drive the LEDs, thereby controlling the LED's light output power.

[0003] like Figure 1 As shown, this is a conventional LED constant current control circuit. It uses an operational amplifier AMP1 for current control. The LED current flows through a sampling resistor R1 to form a terminal voltage. The operational amplifier AMP1 compares this terminal voltage with a reference voltage and outputs a comparison signal to adjust the output current of the power transistor M1, thus achieving feedback regulation. Ultimately, the LED current value is the ratio of the reference voltage to the resistance, achieving constant current control. However, because the resistor is in the current drive circuit, the resistor heats up when a high-power current flows through it, causing a change in its resistance value. This, in turn, causes a change in the LED drive current, affecting the accuracy of current control and leading to unstable LED light output. Furthermore, changes in ambient temperature directly affect the LED junction temperature, thus impacting the LED's luminous efficiency and causing unstable LED light output under constant current conditions.

[0004] Therefore, traditional constant current control methods cannot achieve stable light emission from the light source. Utility Model Content

[0005] The purpose of this invention is to provide an endoscope light source device that solves the problem that traditional constant current control methods cannot achieve stable light emission.

[0006] The first aspect of this utility model provides an endoscope light source device, including: an optomechanical module and a constant power control board;

[0007] The optomechanical module includes an optomechanical housing, a light source emitting plate and a light source receiving plate disposed in the optomechanical housing, and the optomechanical housing has an inlet and an outlet for light signals to be incident and emitted.

[0008] The light source emitting plate is disposed at the light inlet, and the light source emitting plate is used to emit a light signal that changes accordingly based on the received current signal;

[0009] The light source receiving board is disposed inside the optomechanical housing. The light source receiving board is used to receive part of the optical signal and convert it into a voltage feedback signal.

[0010] The constant power control board is separately disposed from the optomechanical module and is connected to the light source emitting board and the light source receiving board respectively via signal lines. The constant power control board is used to adjust the current signal based on the voltage feedback signal to drive the light source emitting board with constant power.

[0011] Optionally, the light source emitting plate includes multiple light source emitting plates, and the light source receiving plate includes multiple light source receiving plates;

[0012] The plurality of light source emitting boards and the plurality of light source receiving boards are arranged in a one-to-one correspondence.

[0013] Optionally, the constant power control board includes a first circuit board and a plurality of constant power control circuits disposed on the first circuit board, each of the constant power control circuits being connected to a light source emitting board and a light source receiving board respectively.

[0014] Optionally, the constant power control circuit includes a first operational amplifier and a power transistor;

[0015] The non-inverting input terminal of the first operational amplifier is used to input the reference voltage, the inverting input terminal of the first operational amplifier is used to input the voltage feedback signal, the output terminal of the first operational amplifier is connected to the control terminal of the power transistor, the first terminal of the power transistor is used to input the operating voltage, and the second terminal of the power transistor is used to output the current signal.

[0016] Optionally, the constant power control board further includes:

[0017] Controller, used to output voltage regulation signals;

[0018] The voltage output circuit is connected to the controller and several constant power control circuits respectively. The voltage output circuit outputs several reference voltages of corresponding voltage magnitudes to several constant power control circuits based on the voltage regulation signal.

[0019] Optionally, the light source emitting plate includes a second circuit board and light-emitting diodes disposed on the second circuit board.

[0020] Optionally, the light source receiving board includes a third circuit board and a photoelectric conversion circuit disposed on the third circuit board.

[0021] Optionally, the photoelectric conversion circuit includes a photodiode, a resistor unit, and a second operational amplifier;

[0022] The anode of the photodiode, the first end of the resistor unit, and the inverting input of the second operational amplifier are connected. The cathode of the photodiode is connected to the non-inverting input of the second operational amplifier and grounded. The second end of the resistor unit and the output of the second operational amplifier are connected to form the output of the photoelectric conversion circuit. The resistor unit has a preset impedance.

[0023] Optionally, the light source receiving plate includes N;

[0024] Each of the resistor units of the N light source receiving boards is an adjustable resistor circuit, and the adjustable resistor circuit is also connected to the constant power control board.

[0025] Alternatively, each of the resistor units of the N-1 light source receiving boards is an adjustable resistor circuit, and the adjustable resistor circuit is also connected to the constant power control board; N is a positive integer greater than 1;

[0026] The adjustable resistor circuit has a variety of switchable impedance values.

[0027] Optionally, the adjustable resistor circuit includes multiple resistors and a multiplexer switch. The first ends of the multiple resistors are connected together to form the first end of the adjustable resistor circuit. The second ends of the multiple resistors are connected to the multiple first ends of the multiplexer switch. The second end of the multiplexer switch forms the second end of the adjustable resistor circuit. The first end and the second end of the adjustable resistor circuit are respectively connected to the inverting input and output of the second operational amplifier.

[0028] A second aspect of this utility model provides an endoscope system, including an image processing device, an endoscope, and an endoscope light source device as described above.

[0029] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The above-mentioned endoscope light source device includes an optomechanical module and a constant power control board. The optomechanical module includes an optomechanical housing, a light source emitting board and a light source receiving board disposed in the optomechanical housing. The constant power control board is connected to the light source emitting board and the light source receiving board respectively. The light source emitting board drives light emission based on the received current signal. The light source receiving board acquires part of the light signal and converts it into a voltage feedback signal. The constant power control board receives the voltage feedback signal and adjusts the input current of the light source emitting board based on the voltage feedback signal, thereby realizing constant power adjustment. By acquiring the magnitude of the light signal, the magnitude of the current signal is indirectly determined and feedback adjustment is realized, which improves the accuracy of current control and thus ensures constant light output of the endoscope light source device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a circuit diagram of a traditional constant current drive circuit;

[0032] Figure 2 A schematic diagram of a first structure of an endoscope light source device provided in an embodiment of this utility model;

[0033] Figure 3 A second structural schematic diagram of the endoscope light source device provided in an embodiment of this utility model;

[0034] Figure 4 A third structural schematic diagram of the endoscope light source device provided in this embodiment of the utility model;

[0035] Figure 5 This is a fourth structural schematic diagram of the endoscope light source device provided in an embodiment of the present utility model;

[0036] Figure 6 This is a fifth structural schematic diagram of the endoscope light source device provided in an embodiment of the present utility model;

[0037] Figure 7 A sixth structural schematic diagram of the endoscope light source device provided in an embodiment of this utility model;

[0038] Figure 8 A first circuit diagram of an endoscope light source device provided in an embodiment of this utility model;

[0039] Figure 9 A second circuit diagram of the endoscope light source device provided in an embodiment of this utility model;

[0040] Figure 10 This is a seventh structural schematic diagram of the endoscope light source device provided in the embodiments of this utility model. Detailed Implementation

[0041] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] The first aspect of this utility model provides an endoscope light source device, such as... Figures 2 to 4 As shown, in this embodiment, the endoscope light source device includes an optomechanical module 100 and a constant power control board 200.

[0046] The optomechanical module 100 includes an optomechanical housing 10, a light source emitting plate 20 disposed on the optomechanical housing 10, and a light source receiving plate 30. The optomechanical housing 10 has an inlet port 11 and an outlet port 12 for the input and output of light signals.

[0047] The light source emitting plate 20 is disposed at the light inlet 11, and the light source emitting plate 20 is used to emit a light signal that changes accordingly based on the received current signal;

[0048] The light source receiving board 30 is disposed inside the optomechanical housing 10. The light source receiving board 30 is used to receive part of the optical signal and convert it into a voltage feedback signal.

[0049] The constant power control board 200 is set separately from the optomechanical module 100 and is connected to the light source emitting board 20 and the light source receiving board 30 respectively through signal lines. The constant power control board 200 is used to adjust the current signal based on the voltage feedback signal to drive the light source emitting board 20 with constant power.

[0050] In this embodiment, the light source emitting plate 20 can be partially embedded in the optomechanical housing 10, or it can be disposed outside or inside the optomechanical housing 10, for example... Figure 3 As shown, the light source emitting plate 20 is disposed outside the optical engine housing 10 and attached to the optical engine housing 10. The light emission position of the light source emitting plate 20 is set relative to the light inlet 11, or as shown in the figure. Figure 4 As shown, the optical engine housing 10 is also provided with a receiving cavity 13, which is connected to the light inlet 11, and the light source emitting plate 20 is disposed in the receiving cavity 13.

[0051] The light source receiving plate 30 can be partially embedded in the optomechanical housing 10 or disposed inside the optomechanical housing 10. In an optional embodiment, the outer wall of the optomechanical housing 10 may be provided with a receiving groove 14 for accommodating the light source receiving plate 30. The receiving groove 14 is connected to the light inlet 11 so that the light signal emitted by the light source emitting plate 20 enters the receiving groove 14. The receiving groove 14 is a space formed by the inward indentation of the outer wall of the optomechanical housing 10.

[0052] The optical engine housing 10 also includes a receiving space 15 that connects the light inlet 11 and the light outlet 12. The receiving space 15 and the receiving slot 14 are set independently of each other. The receiving slot 14 does not occupy the internal space of the receiving space 15. The receiving space 15 can also be equipped with a corresponding lens module to realize the transmission and processing of optical signals.

[0053] The constant power control board 200 is used to control the light source of the optomechanical module 100 to output a constant light power. The constant power control board 200 is set outside the optomechanical housing 10 and transmits current signals and receives voltage feedback signals through signal lines.

[0054] When the endoscope light source device is working, the constant power control board 200 first outputs a current signal to the light source emitting board 20. After receiving the current signal, the light source emitting board 20 emits a light signal that changes in a positive correlation with the current signal. The intensity of the light signal indirectly represents the magnitude of the current signal, but it is not a strictly proportional relationship.

[0055] On the one hand, the light signal enters through the light inlet 11 and exits through the light outlet 12. On the other hand, a portion of the light signal emitted by the light source emitting plate 20 is emitted to the light source receiving plate 30 in the receiving slot. This portion of the light signal may be part of the scattered light emitted by the light source emitting plate or part of the light signal obtained by beam splitting. The light source receiving plate 30 performs photoelectric conversion, converting part of the light signal into a voltage feedback signal. The magnitude of the voltage feedback signal is positively correlated with the light signal and the current signal of the light source emitting plate 20. That is, when the current signal increases, the light signal becomes stronger and the voltage feedback signal becomes larger; when the current signal decreases, the light signal becomes weaker and the voltage feedback signal becomes smaller.

[0056] Correspondingly, the constant power control board 200 receives the voltage feedback signal and compares it with the reference voltage Vref to achieve constant power control. When the voltage feedback signal is detected to be greater than the reference voltage Vref, the current signal is reduced, thereby reducing the light output. When the voltage feedback signal is detected to be less than the reference voltage Vref, the current signal is increased, thereby increasing the light output. The light output is constant until the voltage feedback signal is equal to the reference voltage Vref.

[0057] Where Vfb=P0×K1×K2;

[0058] Vfb is the voltage feedback signal, P0 is the total light output power of the light source emitting board 20, K1 is the ratio of the partial light signal to the total light signal emitted by the light source emitting board 20, and K2 is the photoelectric conversion ratio of the light source receiving board 30.

[0059] When the voltage feedback signal is equal to the reference voltage Vref, the total output power of the light source emitting plate 20 is P0 = Vref / (K1×K2), where K1×K2 is a fixed value. When the reference voltage Vref remains unchanged, the total output power of the light source emitting plate 20 remains constant, thus ensuring a constant output light quantity.

[0060] By directly sampling the light emitted from the light source emitting board 20, there is no need to set a resistor in the current loop of the light source emitting board 20, thus avoiding temperature changes caused by the resistor bearing high power or by changes in ambient temperature, and ensuring stable light output.

[0061] Furthermore, by configuring the corresponding voltage feedback signal into the feedback loop, when the light source unit of the light source emitting board 20 ages or its luminous efficiency changes, the constant power control board 200 can perform real-time compensation of the light signal, realize real-time feedback and adjustment at the circuit hardware level, keep the effective power of the light source emitting board 20 stable in real time, and realize real-time and stable control of the light output.

[0062] In this embodiment, the light source emitting board 20 uses LEDs as the light source, and the light source receiving board 30 can use corresponding circuit boards and photoelectric receiving circuits, conversion circuits, etc. In one optional embodiment, such as... Figure 5 As shown, the light source emitting board 20 includes a second circuit board 21 and a light-emitting diode D1 disposed on the second circuit board 21, and the light source receiving board 30 includes a third circuit board 31 and a photoelectric conversion circuit 32 disposed on the third circuit board 31.

[0063] The second circuit board 21 is also provided with an interface and / or wiring for connecting the constant power control board 200 and the light-emitting diode D1. The wiring can be a connecting wire or a copper foil wiring on the second circuit board 21. The constant power control board 200 outputs a current signal to the light-emitting diode D1, and the light-emitting diode D1 emits a light signal that changes in a positive correlation.

[0064] The third circuit board 31 is also provided with an interface and / or wiring connecting the constant power control board 200 and the photoelectric conversion circuit 32. The wiring can be a connecting wire or a copper foil wiring on the third circuit board 31. The photoelectric conversion circuit 32 receives part of the light signal emitted by the light-emitting diode D1, performs photoelectric conversion, and outputs a voltage feedback signal. The constant power control board 200 receives the voltage feedback signal output by the photoelectric conversion circuit 32 through the signal line, and adjusts the current signal based on the voltage feedback signal. When the voltage feedback signal increases, the output current signal decreases, thereby reducing the light output. When the voltage feedback signal decreases, the output current signal increases, thereby increasing the light output, thus achieving constant output light power.

[0065] The photoelectric conversion circuit 32 can employ photosensitive elements such as photodiodes (PDs) and photoresistors, as well as corresponding current-to-voltage conversion circuits. In an optional embodiment, such as... Figure 9 As shown, the photoelectric conversion circuit 32 includes a photodiode PD, a resistor unit 321, and a second operational amplifier AMP2;

[0066] The anode of the photodiode PD is connected to the first terminal of the resistor unit 321 and the inverting input terminal of the second operational amplifier AMP2. The cathode of the photodiode PD is connected to the non-inverting input terminal of the second operational amplifier AMP2 and grounded. The second terminal of the resistor unit 321 is connected to the output terminal of the second operational amplifier AMP2 to form the output terminal of the photoelectric conversion circuit 32. The resistor unit 321 has a preset impedance.

[0067] In this embodiment, after the photodiode PD acquires the optical signal, it converts it into a sampling current. The resistor unit 321 and the second operational amplifier AMP2 form a transimpedance amplifier and perform current-to-voltage conversion on the sampling current, outputting a voltage feedback signal. The ratio of the voltage feedback signal to the sampling resistor is the impedance of the resistor unit 321. The magnitude of the sampling current is the product of the photoelectric conversion sensitivity of the photodiode PD and the magnitude of the optical signal.

[0068] Correspondingly, Vfb = P0 × K1 × K3 × R0;

[0069] Vfb is the voltage feedback signal, P0 is the total light output power of the light source emitting board 20, K1 is the ratio of the partial light signal to the total light signal emitted by the light source emitting board 20, K3 is the photoelectric conversion sensitivity of the photodiode PD, and R0 is the resistance value of the resistor unit 321.

[0070] When the voltage feedback signal is equal to the reference voltage Vref, the total output power P0 of the light source emitting plate 20 is P0 = Vref / (K1 × K3 × R0), where K1 × K3 × R0 is a fixed value. When the reference voltage Vref remains unchanged, the total output power of the light source emitting plate 20 remains constant, and the light output of the light source emitting plate 20 is constant.

[0071] The light source emitting plate 20 and the light source receiving plate 30 can be configured as one or more according to the working requirements of the optomechanical module 100. In an optional embodiment, such as Figure 4 As shown, there are multiple light source emitting plates 20 and multiple light source receiving plates 30, and the multiple light source emitting plates 20 and the multiple light source receiving plates 30 are arranged in a one-to-one correspondence.

[0072] Each light source emitting plate 20 can generate light signals of different colors and wavelengths, such as red light, green light, blue light, and violet light. Each light source emitting plate 20 is correspondingly set with the first light source receiving plate 30. The light source receiving plate 30 receives the light signal emitted by the matched light source emitting plate 20 and converts it into a voltage feedback signal.

[0073] The constant power control board 200 can independently control the output of light signals of each color, thereby changing the proportion of each color component in the illumination light, and thus adjusting the color temperature of the illumination light and adjusting it for clinical diagnosis, etc.

[0074] When multiple light source emitting boards 20 and light source receiving boards 30 are provided, one or more constant power control boards 200 can be provided. To reduce design costs, in an optional embodiment, such as... Figure 5 and Figure 6 As shown, the constant power control board 200 includes a first circuit board 210 and a plurality of constant power control circuits 220 disposed on the first circuit board 210. Each constant power control circuit 220 is connected to a light source emitting board 20 and a light source receiving board 30, respectively.

[0075] When the light source emitting plate 20 and the light source receiving plate 30 are a set, the constant power control circuit 220 includes one. When the light source emitting plate 20 and the light source receiving plate 30 include multiple sets, the number of constant power control circuits 220 is set to be the same as the number of light source emitting plates 20.

[0076] Each constant power control circuit 220 receives voltage feedback signals and performs constant power control of current signals on the light source emitting board 20 and light source receiving board 30 connected to it.

[0077] The constant power control circuit 220 can adopt structures such as operational amplifiers and comparators. In an optional embodiment, such as... Figure 8 As shown, the constant power control circuit 220 includes a first operational amplifier AMP1 and a power transistor M1;

[0078] The non-inverting input of the first operational amplifier AMP1 is used to input the reference voltage Vref, and the inverting input of the first operational amplifier AMP1 is used to input the voltage feedback signal. The output of the first operational amplifier AMP1 is connected to the control terminal of the power transistor M1. The first terminal of the power transistor M1 is used to input the operating voltage, and the second terminal of the power transistor M1 is used to output the current signal.

[0079] The power transistor M1 can be a corresponding switching transistor. In an optional embodiment, the power transistor M1 is an NMOS transistor.

[0080] When the constant power control circuit 220 is working, it receives the voltage feedback signal output by the light source receiving board 30 and compares it with the reference voltage Vref. The first operational amplifier AMP1 outputs a voltage comparison signal to the power transistor M1, and the power transistor M1 outputs a positively correlated current signal according to the voltage comparison signal.

[0081] When the current signal increases, the light signal increases, and the voltage feedback signal increases. At this time, the voltage comparison signal output by the first operational amplifier AMP1 decreases, thereby reducing the current signal. Conversely, when the current signal decreases, the light signal decreases, and the voltage feedback signal decreases. At this time, the voltage comparison signal output by the first operational amplifier AMP1 increases, thereby increasing the current signal, until the voltage feedback signal equals the reference voltage Vref, ultimately achieving constant light output from the light source emitting plate 20.

[0082] Furthermore, under different requirements, a single light source emitting panel 20 can emit light signals of varying intensities, or multiple light source emitting panels 20 can adjust the proportion of light signal emission levels under different light emission modes to meet different light color requirements. In an optional embodiment, such as... Figure 7 As shown, in order to achieve the adjustment of the optical signal magnitude, the constant power control board 200 also includes:

[0083] Controller 230 is used to output voltage regulation signals;

[0084] The voltage output circuit 240 is connected to the controller 230 and several constant power control circuits 220 respectively. The voltage output circuit 240 outputs several reference voltages Vref of corresponding voltage magnitudes to several constant power control circuits 220 based on the voltage regulation signal.

[0085] In this embodiment, the voltage output circuit 240 can be a voltage source, power conversion circuit, etc., and can output one or more reference voltages Vref.

[0086] The controller 230 can be connected to corresponding touch screens, buttons and other input modules, and adjust the output of different voltage regulation signals according to the parameter settings. The voltage output circuit 240 outputs one or more reference voltages Vref of different magnitudes based on different voltage regulation signals.

[0087] For example, assuming that the light source emitting plate 20 and the light source receiving plate 30 include four groups, and the constant power control circuit 220 includes four groups, the endoscope system has multiple light output modes. In each light output mode, the light output ratio of multiple groups is different. Assuming that the light output ratio of each group is 1:1:1:1, under the same structure of each component on the light source emitting plate 20 and the light source receiving plate 30, the voltage output circuit 240 can be configured to output four reference voltages Vref of equal magnitude to the four constant power control circuits 220. When the reference voltage Vref changes, the total light output power of the light source emitting plate 20 changes, and four light signals with a light output ratio of 1:1:1:1 are output.

[0088] Alternatively, when the light output ratio of each group is 1:2:3:4, with the same structure of each component on the light source emitting board 20 and the light source receiving board 30, the voltage output circuit 240 can be configured to output four reference voltages Vref with a ratio of 1:2:3:4 to four constant power control circuits 220. When the reference voltage Vref changes, the total light output power of the light source emitting board 20 changes, and four optical signals with a light output ratio of 1:2:3:4 are output.

[0089] Based on the formula P0 = Vref / (K1×K3×R0) for the total light output power of the light source emitting plate 20, it can be seen that the resistance of the resistor unit 321 can also be adjusted to change the total light output power of the light source emitting plate 20. Correspondingly, in an optional embodiment, the light source receiving plate 30 includes N, where N is a positive integer greater than 1, that is, both the light source receiving plate 30 and the light source emitting plate 20 include multiples.

[0090] The adjustable resistor circuit can be connected to the constant power control board 200 or other control modules, and output impedances of different values ​​based on the received resistance adjustment signal, thereby changing the total light output power P0 of the light source emitting board 20.

[0091] To simplify the structure of the endoscope light source device, in an optional embodiment, the adjustable resistor circuit is connected to the constant power control board 200 and to the controller 230 on the constant power control board, and the controller 230 outputs a corresponding resistance adjustment signal.

[0092] The adjustable resistor circuit adjusts the signal output of resistors with different resistance values ​​based on different resistance values, and sends them to the inverting input and output terminals of the second operational amplifier AMP2. When the adjustable resistor circuit switches the output resistance value to increase, the total light output power P0 of the light source emitting board 20 decreases and the light signal becomes stronger. When the adjustable resistor circuit switches the output resistance value to decrease, the total light output power P0 of the light source emitting board 20 increases and the light signal becomes weaker.

[0093] In addition, each resistor unit 321 of the multiple light source receiving boards 30 can be selected and set as an adjustable resistor circuit or a fixed value according to the light output requirements. In an optional embodiment, all resistor units 321 of the N light source receiving boards 30 are adjustable resistor circuits, or each resistor unit 321 of the N-1 light source receiving boards 30 is an adjustable resistor circuit.

[0094] Therefore, in different light emission modes, when the light emission ratios of multiple groups are different, the impedance of each resistor unit 321 on the N light source receiving boards 30 can be adjusted accordingly to change the total light emission power of each light source emitting board 20.

[0095] Alternatively, the resistor unit 321 on one of the light source receiving boards 30 can be kept at a fixed resistance value, while the resistance value of the resistor unit 321 on the remaining light source receiving boards 30 can be adjusted. This allows the total light output power of one of the light source emitting boards 20 to remain constant, and the total light output power of the remaining light source emitting boards 20 to be adjusted to achieve a relative light output ratio.

[0096] For example, assuming that the light source emitting board 20 and the light source receiving board 30 include four groups, and the constant power control circuit 220 includes four groups, the endoscope system has multiple light output modes. In each light output mode, the light output ratio of multiple groups is different. Assuming that the light output ratio of each group is 1:1:1:1, when all the components on the light source emitting board 20 are the same and the reference voltage Vref on each constant power control board 200 is the same, different resistance adjustment signals can be configured to switch the output, thereby configuring four resistors of equal size to be output to the inverting input and output terminals of four second operational amplifiers AMP2. When the resistance value of the resistor unit 321 changes, the total light output power of the light source emitting board 20 changes, and four light signals with a light output ratio of 1:1:1:1 are output.

[0097] Alternatively, when the light output ratio of each group is 1:2:3:4, and all components on the light source emitting board 20 are the same and the reference voltage Vref on each constant power control board 200 is the same, different resistance adjustment signals can be configured to be switched to output. This allows four resistors with a ratio of 4:3:2:1 to the inverting input and output terminals of the four second operational amplifiers AMP2. When the resistance value of the resistor unit 321 changes, the total light output power of the light source emitting board 20 changes, and four light signals with a light output ratio of 1:2:3:4 are output. When switching from a light output ratio of 1:1:1:1 to 1:2:3:4, the resistance values ​​of the four resistor units 321 on the four light source receiving boards 30 can be changed to switch their resistance ratio to 4:3:2:1, thereby changing the light output ratio of the total light output power of the four light source emitting boards 20 to 1:2:3:4.

[0098] Alternatively, the resistance value of one of the resistor units 321 can be kept constant and set to a fixed resistance value, while the other three are set as adjustable resistor circuits with variable impedance. The resistance values ​​of the remaining three resistor units 321 can be changed to switch the resistance ratio of the resistors to the fixed resistance unit 321 to 4:3:2:1, thereby changing the total light output power ratio of the four light source emitting plates 20 to 1:2:3:4.

[0099] The adjustable resistor circuit can be composed of a resistor array, a switch array, or a sliding rheostat, a variable resistor, etc. In an optional embodiment, such as... Figure 10 As shown, the adjustable resistor circuit includes multiple resistors and a multiplexer Q1. The first ends of the multiple resistors R2 are connected together to form the first end of the adjustable resistor circuit. The second ends of the multiple resistors R2 are connected to the multiple first ends of the multiplexer Q1. The second end of the multiplexer Q1 forms the second end of the adjustable resistor circuit. The first end and the second end of the adjustable resistor circuit are respectively connected to the inverting input and output of the second operational amplifier AMP2.

[0100] Among them, the resistance values ​​of multiple resistors R2 are different. When switching to different resistors R2, the adjustable resistor circuit switches the output of resistors R2 with different resistance values ​​to the inverting input and output terminals of the second operational amplifier AMP2, thereby adjusting the light output power and light output size of the light source emitting board 20 in reverse.

[0101] The switching device Q1 can be a switching device with controlled on / off states, such as a transistor or MOSFET, and the specific structure is not limited.

[0102] Furthermore, a corresponding lens can be installed between the light inlet and the light outlet 12 inside the optical engine housing 10 for focusing, emission, etc. Figure 4 As shown, in an optional embodiment, the housing also has an accommodating space 15 communicating with the light inlet 11 and the light outlet 12.

[0103] The optical engine module 100 also includes:

[0104] Several incident lens groups 40 are disposed in the accommodating space. Each incident lens group 40 corresponds to the emitting end of each light source emitting plate 20. The incident lens group 40 is used to converge the light signal emitted from the corresponding light source emitting plate 20 to the main optical path.

[0105] The coupling mirror assembly 50 is disposed within the accommodating space and corresponds to the light output port 12.

[0106] The number of incident lens groups 40 is matched with the number of light source emitting plates 20. The incident lens groups 40 are housed within the accommodating space and correspond to the exiting ends of the light source emitting plates 20. The incident lens groups 40 are used to converge the light beam emitted from the exiting ends of the light source emitting plates 20 into the main optical path. The incident lens groups 40 can be collimating lens groups, or other optical lens elements with collimation functions. Alternatively, the incident lens groups 40 can also be diffusing or converging lens groups, in which case the diffused or converged light beams are nearly parallel, resulting in a high utilization rate of the light beam in the main optical path.

[0107] The light beam emitted from the emitting end of the light source emitting plate 20 converges at the coupling mirror group 50 after passing through the incident lens group 40. Therefore, the light beam emitted from the light source emitting plate 20 passes through the incident lens group 40 and the coupling mirror group 50 in sequence. At the same time, the optical path transmitted between the incident lens and the coupling mirror group 50 is the main optical path.

[0108] Near the coupling lens group and the light outlet, corresponding lenses 60 can also be installed to achieve functions such as windproof, dustproof, and waterproof.

[0109] The light source receiving board 30 can be set on the side of the main optical path to receive a portion of the optical signal. The portion of the optical signal can be a stray optical signal or a portion of the optical signal formed by beam splitting.

[0110] In an alternative embodiment, such as Figure 10 As shown, the optomechanical module 100 also includes:

[0111] Several beam splitter groups 70 are arranged in the accommodating space and located on the light output path of each light source emitting plate 20. The beam splitter group 70 is used to split the light signal emitted from the corresponding light source emitting plate 20, and output part of the light signal to the coupling mirror group 50 and output part of the light signal to the light source receiving plate 30.

[0112] The beam splitter group 70 can be a beam splitter, a reflector, etc. The beam splitter group 70 splits part of the optical signal to the light source receiving plate 30 and splits the main optical signal to the main optical path.

[0113] The number of beam splitter groups 70 is set according to the corresponding settings of the light source emitting plate 20. The beam splitter group 70 can be set between each group of light source emitting plate 20 and light source receiving plate 30, or between one or more groups of light source emitting plate 20 and light source receiving plate 30. The specific number of beam splitter groups 70 is unlimited.

[0114] Furthermore, when the light source emitting board 20 includes multiple light source receiving boards 30, the optomechanical module 100 includes multiple optical signals. In order to achieve converged output of the optical signals, in an optional embodiment, such as... Figure 4 As shown, the optomechanical module 100 also includes a two-way mirror group 80, which is disposed in the accommodating space. The two-way mirror group 80 is used to converge the light signals emitted from several incident lens groups 40 and transmit them to the coupling mirror group 50. The light beam emitted from the emitting end of the light source emitting plate 20 passes through the corresponding incident lens group 40 and the two-way mirror group 80 and then converges at the coupling mirror group 50.

[0115] The two-way mirror group 80 is used to converge the light beams emitted from the emitting ends of each light source emitting plate 20 and transmit the finally converged light beam to the coupling mirror group 50.

[0116] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The above-mentioned endoscope light source device includes an optical engine module 100 and a constant power control board 200. The optical engine module 100 includes an optical engine housing 10, a light source emitting plate 20 and a light source receiving plate 30 disposed on the optical engine housing 10. The constant power control board 200 is connected to the light source emitting plate 20 and the light source receiving plate 30 respectively. The light source emitting plate 20 is driven to emit light based on the received current signal. The light source receiving plate 30 acquires part of the light signal and converts it into a voltage feedback signal. The constant power control board 200 receives the voltage feedback signal and adjusts the input current of the light source emitting plate 20 based on the voltage feedback signal, thereby realizing constant power adjustment. By acquiring the magnitude of the light signal, the magnitude of the current signal is indirectly determined and feedback adjustment is realized, which improves the accuracy of current control and thus ensures that the light output of the endoscope light source device is constant.

[0117] The second aspect of this utility model provides an endoscope system, which includes an image processing device, an endoscope, and an endoscope light source device. The specific structure of the endoscope light source device is as described in the above embodiments. Since this endoscope system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0118] The endoscope light source device is used to generate a light source for illumination, which is then irradiated onto the specimen through the transmission medium in the endoscope. The imaging unit of the endoscope then captures the specimen signal and generates image information, which is transmitted to the image processing equipment for further processing of the image signal and displayed on the monitor.

[0119] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. An endoscope light source device, characterized in that, The application relates to a light machine module (100) and a constant power control board (200). The light machine module (100) comprises a light machine shell (10), a light source emitting plate (20) and a light source receiving plate (30) arranged on the light machine shell (10), and the light machine shell (10) has a light inlet (11) and a light outlet (12) for light signal incidence and emission. The light source emitting plate (20) is arranged at the light inlet (11), and the light source emitting plate (20) is used for emitting a relevant changed light signal based on a received current signal. The light source receiving plate (30) is arranged in the light machine shell (10), and the light source receiving plate (30) is used for receiving part of the light signal and converting the light signal into a voltage feedback signal. The constant power control board (200) is arranged separately from the light machine module (100) and is connected with the light source emitting plate (20) and the light source receiving plate (30) through signal lines, and the constant power control board (200) is used for adjusting the current signal based on the voltage feedback signal to drive the light source emitting plate (20) with constant power. The light source emitting plate (20) comprises a plurality of light source emitting plates (20), and the light source receiving plate (30) comprises a plurality of light source receiving plates (30).

2. The endoscope light source apparatus of claim 1, wherein The plurality of light source emitting plates (20) and the plurality of light source receiving plates (30) are arranged in one-to-one correspondence. The constant power control board (200) comprises a first circuit board (210) and a plurality of constant power control circuits (220) arranged on the first circuit board (210), and each constant power control circuit (220) is connected with one light source emitting plate (20) and one light source receiving plate (30).

3. The endoscope light source apparatus as claimed in claim 1 or 2, characterized by The constant power control circuit (220) comprises a first operational amplifier (AMP1) and a power tube (M1).

4. The endoscope light source apparatus of claim 3, wherein The non-inverting input end of the first operational amplifier (AMP1) is used for inputting a reference voltage, the inverting input end of the first operational amplifier (AMP1) is used for inputting the voltage feedback signal, the output end of the first operational amplifier (AMP1) is connected with the control end of the power tube (M1), the first end of the power tube (M1) is used for inputting a working voltage, and the second end of the power tube (M1) is used for outputting the current signal. The constant power control board (200) further comprises:

5. The endoscope light source apparatus of claim 4, wherein a controller (230) used for outputting a voltage adjusting signal; a voltage output circuit (240) connected with the controller (230) and the plurality of constant power control circuits (220), and the voltage output circuit (240) outputs a plurality of reference voltages with corresponding voltage sizes to the plurality of constant power control circuits (220) based on the voltage adjusting signal. The light source emitting plate (20) comprises a second circuit board (21) and a light emitting diode (D1) arranged on the second circuit board (21).

6. The endoscope light source apparatus of claim 1, wherein The light source receiving plate (30) comprises a third circuit board (31) and a photoelectric conversion circuit (32) arranged on the third circuit board (31).

7. The endoscope light source apparatus of claim 5, wherein ​ 8. The endoscope light source apparatus of claim 7, wherein The photoelectric conversion circuit (32) comprises a photodiode (PD), a resistance unit (321) and a second operational amplifier (AMP2). The anode of the photodiode (PD), the first end of the resistance unit (321) and the inverting input terminal of the second operational amplifier (AMP2) are connected, the cathode of the photodiode (PD) and the non-inverting input terminal of the second operational amplifier (AMP2) are connected and grounded, the second end of the resistance unit (321) and the output terminal of the second operational amplifier (AMP2) are connected to constitute the output terminal of the photoelectric conversion circuit (32), and the resistance unit (321) has a preset impedance.

9. The endoscope light source apparatus of claim 8, wherein The light source receiving plate (30) comprises N; Each resistance unit (321) of the N light source receiving plates (30) is a tunable resistance circuit, and the tunable resistance circuit is further connected with the constant power control plate (200); Alternatively, each resistance unit (321) of N-1 light source receiving plates (30) is a tunable resistance circuit, and the tunable resistance circuit is further connected with the constant power control plate (200); N is a positive integer greater than 1. The tunable resistance circuit has a plurality of switchable different impedance values.

10. The endoscope light source apparatus of claim 9, wherein The tunable resistance circuit comprises a plurality of resistors and a plurality of switching switches (K1), the first ends of the plurality of resistors (R2) are commonly connected to constitute the first end of the tunable resistance circuit, the second ends of the plurality of resistors (R2) are connected with the plurality of first ends of the plurality of switching switches (K1), the second end of the plurality of switching switches (K1) constitutes the second end of the tunable resistance circuit, and the first end and the second end of the tunable resistance circuit are respectively connected with the inverting input terminal and the output terminal of the second operational amplifier (AMP2).

11. An endoscope system characterized by comprising: The endoscope light source device as claimed in any one of claims 1 to 10. An image processing apparatus, an endoscope, and an endoscope light source device as claimed in any one of claims 1 to 10.

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