Endoscope light source device and endoscope system

Abstract

The present invention proposes an endoscope light source device and an endoscope system, wherein the endoscope light source device includes an optical-mechanical module and a constant power control board, the optical-mechanical module includes an optical-mechanical housing, a light source transmitting board and a light source receiving board arranged in the optical-mechanical housing, the constant power control board is respectively connected to the light source transmitting board and the light source receiving board, the light source transmitting board drives the light emission based on the received current signal, the light source receiving board obtains 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 transmitting board based on the voltage feedback signal, thereby realizing constant power regulation, indirectly determining the size of the current signal by obtaining the size of the light signal, and realizing feedback regulation, thereby improving the accuracy of current control, and further ensuring the constant light output of the endoscope light source device.

Description

Technical Field

[0001] The present invention belongs to the technical field of endoscopes, and in particular relates to an endoscope light source device and an endoscope system. Background Art

[0002] The endoscope system is mainly composed of an endoscope light source device, an electronic endoscope and an image processor. The endoscope light source device is used to generate a light source for illumination, and irradiates the light source onto the specimen through the transmission medium in the electronic endoscope, and then the imaging unit of the endoscope captures the specimen signal and generates image information, which is transmitted to the image processor for further processing of the image signal and displayed on the display. With the development of LED, endoscope light source devices often choose to use LED as a light source. In situations where endoscopes are used, when the distance between the scope and the detected tissue of the human body is certain, it is necessary to ensure that the light output of the LED is constant in order to observe the image. The traditional LED driving method mainly uses a constant current control circuit to drive the LED to emit light, thereby controlling the light output power of the LED.

[0003] like Figure 1 As shown, it is a conventional LED constant current control circuit, which uses operational amplifier AMP1 for current control. The current of the LED flows through the sampling resistor R1 to form a terminal voltage. The operational amplifier AMP1 compares the terminal voltage with the reference voltage, and outputs a comparison signal to adjust the output current of the power tube M1, thereby realizing feedback regulation, and finally making the current value of the LED the ratio of the reference voltage to the resistor, thereby realizing constant current control. However, since the resistor is in the current drive loop, the resistor heats up when a high-power current flows through the resistor, causing the resistance value of the resistor to change, and then causing the driving current of the LED to change, affecting the accuracy of the current control, and then causing the LED light to be unstable. In addition, when the ambient temperature changes, it will directly affect the junction temperature of the LED, thereby affecting the luminous efficiency of the LED, resulting in unstable LED light under constant current conditions.

[0004] Therefore, the traditional constant current control method cannot achieve stable light emission of the light source. Summary of the invention

[0005] The object of the present invention is to provide an endoscope light source device, aiming to solve the problem that the traditional constant current control method cannot achieve stable light emission of the light source.

[0006] A first aspect of an embodiment of the present invention provides an endoscope light source device, comprising: an optical-mechanical module and a constant power control board;

[0007] The optical machine module comprises an optical machine housing, a light source transmitting board and a light source receiving board arranged in the optical machine housing, and the optical machine housing has a light inlet and a light outlet for incident and emitted light signals;

[0008] The light source emitting board is arranged at the light entrance, and the light source emitting board is used to emit a light signal with relevant changes based on the received current signal;

[0009] The light source receiving board is arranged in the optical machine housing, and is used to receive part of the light signal and convert it into a voltage feedback signal;

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

[0011] Optionally, the light source emitting board includes a plurality of boards, and the light source receiving board includes a plurality of boards;

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

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

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

[0015] The non-inverting input terminal of the first operational amplifier is used to input a 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 tube, the first terminal of the power tube is used to input an operating voltage, and the second terminal of the power tube is used to output the current signal.

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

[0017] A controller, for outputting a voltage regulation signal;

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

[0019] Optionally, the light source emitting board includes a second circuit board and a light emitting diode arranged on the second circuit board.

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

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

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

[0023] Optionally, the light source receiving plates include N;

[0024] All the resistance units of the N light source receiving boards are adjustable resistance circuits, and the adjustable resistance circuits are also connected to the constant power control board;

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

[0026] The adjustable resistance circuit has multiple switchable impedances with different resistance values.

[0027] Optionally, the adjustable resistance circuit includes multiple resistors and a multi-way switch, the first ends of the multiple resistors are connected together to form the first end of the adjustable resistance circuit, the second ends of the multiple resistors are connected to the multiple first ends of the multi-way switch, the second end of the multi-way switch constitutes the second end of the adjustable resistance circuit, and the first end and the second end of the adjustable resistance circuit are respectively connected one by one to the inverting input end and the output end of the second operational amplifier.

[0028] A second aspect of an embodiment of the present invention provides an endoscope system, comprising an image processing device, an endoscope, and the endoscope light source device as described above.

[0029] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the above-mentioned endoscope light source device includes an optical-mechanical module and a constant power control board, the optical-mechanical module includes an optical-mechanical housing, a light source transmitting board and a light source receiving board arranged in the optical-mechanical housing, the constant power control board is respectively connected to the light source transmitting board and the light source receiving board, the light source transmitting board drives the light emission based on the received current signal, the light source receiving board obtains 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 transmitting board based on the voltage feedback signal, thereby realizing constant power regulation, indirectly determining the size of the current signal by obtaining the size of the light signal, and realizing feedback regulation, thereby improving the accuracy of current control, and thus ensuring the constant light output of the endoscope light source device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It 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 by an embodiment of the present invention;

[0033] Figure 3 A second structural schematic diagram of an endoscope light source device provided by an embodiment of the present invention;

[0034] Figure 4 A third structural schematic diagram of an endoscope light source device provided by an embodiment of the present invention;

[0035] Figure 5 A fourth structural schematic diagram of an endoscope light source device provided by an embodiment of the present invention;

[0036] Figure 6 A fifth structural schematic diagram of an endoscope light source device provided by an embodiment of the present invention;

[0037] Figure 7 A sixth structural schematic diagram of an endoscope light source device provided by an embodiment of the present invention;

[0038] Figure 8 A first circuit diagram of an endoscope light source device provided by an embodiment of the present invention;

[0039] Fig. 9 A second circuit diagram of an endoscope light source device provided by an embodiment of the present invention;

[0040] Fig.10 This is a seventh structural schematic diagram of the endoscope light source device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

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

[0043] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] A first aspect of an embodiment of the present invention provides an endoscope light source device, such as Figures 2 to 4 As shown, in this embodiment, the endoscope light source device includes an optical-mechanical module 100 and a constant power control board 200 .

[0046] The optical machine module 100 includes an optical machine housing 10, a light source emitting board 20 and a light source receiving board 30 disposed in the optical machine housing 10, and the optical machine housing 10 has a light inlet 11 and a light outlet 12 for incident and emitted light signals;

[0047] The light source emitting board 20 is disposed at the light entrance 11, and the light source emitting board 20 is used to emit a light signal with relevant changes based on the received current signal;

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

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

[0050] In this embodiment, the light source emitting board 20 may be partially embedded in the optical machine housing 10, or may be disposed outside or inside the optical machine housing 10, for example. Figure 3As shown, the light source emitting board 20 is arranged outside the optical machine housing 10 and attached to the optical machine housing 10, and the light emitting position of the light source emitting board 20 is arranged relative to the light inlet 11, or as shown in FIG. Figure 4 As shown, a receiving cavity 13 is further provided in the optical machine housing 10 . The receiving cavity 13 is communicated with the light inlet 11 , and the light source emitting board 20 is disposed in the receiving cavity 13 .

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

[0052] The optical machine housing 10 also includes a accommodating space 15 connecting the light inlet 11 and the light outlet 12. The accommodating space 15 and the accommodating groove 14 are independently arranged. The accommodating groove 14 does not occupy the internal space of the accommodating space 15. A corresponding lens module can also be arranged inside the accommodating space 15 to realize the transmission and processing of optical signals.

[0053] The constant power control board 200 is used to control the optical machine module 100 to output a light source with constant optical power. The constant power control board 200 is arranged outside the optical machine 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 strength of the light signal indirectly represents the size of the current signal, but it is not a strictly proportional relationship.

[0055] On the one hand, the optical signal is incident through the light inlet 11 and emitted from the light outlet 12. On the other hand, part of the optical signal is emitted from the light source emitting board 20 to the light source receiving board 30 in the receiving groove. Part of the optical signal may be part of the scattered light emitted by the light source emitting board or part of the optical signal obtained by splitting. The light source receiving board 30 performs photoelectric conversion to convert part of the optical signal into a voltage feedback signal. The size of the voltage feedback signal is positively correlated with the optical signal and the current signal of the light source emitting board 20, that is, when the current signal becomes larger, the optical signal becomes stronger and the voltage feedback signal becomes larger. When the current signal becomes smaller, the optical 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 it is detected that the voltage feedback signal is greater than the reference voltage Vref, the current signal is reduced, thereby reducing the light output. When it is detected that the voltage feedback signal is less than the reference voltage Vref, the current signal is increased, thereby increasing the light output. When the voltage feedback signal is equal to the reference voltage Vref, the light output is constant.

[0057] Wherein, Vfb=P0×K1×K2;

[0058] Vfb is a 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 light output power P0 of the light source emitting board 20 is Vref / (K1×K2), wherein K1×K2 is a fixed value. When the reference voltage Vref remains unchanged, the total light output power of the light source emitting board 20 remains constant, thereby making the light output constant.

[0060] By directly sampling the light emitted by 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, thereby avoiding temperature changes caused by the resistor being subjected to high power or changes in ambient temperature, thereby ensuring stable light emission.

[0061] And 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 the luminous efficiency changes, the constant power control board 200 can realize real-time compensation of the light signal, realize real-time feedback and adjustment at the circuit hardware level, and keep the effective power of the light source emitting board 20 stable in real time, so as to realize real-time and stable control of the light output.

[0062] The light source transmitting board 20 uses LED as the light source, and the light source receiving board 30 can use a corresponding circuit board and a photoelectric receiving circuit, a conversion circuit, etc. In an optional embodiment, 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 routing connecting the constant power control board 200 and the light-emitting diode D1. The routing may be a connecting wire or a copper foil routing 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 with positively correlated changes.

[0064] The third circuit board 31 is also provided with an interface and / or routing connecting the constant power control board 200 and the photoelectric conversion circuit 32. The routing may be a connecting line or a copper foil routing on the third circuit board 31. The photoelectric conversion circuit 32 receives part of the optical 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 performs feedback adjustment on the current signal based on the voltage feedback signal. When the voltage feedback signal becomes larger, the output current signal is reduced, thereby reducing the light output. When the voltage feedback signal becomes smaller, the output current signal is increased, thereby increasing the light output, thereby achieving constant output optical power.

[0065] The photoelectric conversion circuit 32 can use photodiodes PD, photoresistors and other photosensitive elements and corresponding current-to-voltage conversion circuits. In an optional embodiment, Fig. 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, the first end of the resistor unit 321 and the inverting input terminal of the second operational amplifier AMP2 are connected, the cathode of the photodiode PD is connected to the non-inverting input terminal of the second operational amplifier AMP2 and is grounded, the second end 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, and the resistor unit 321 has a preset impedance.

[0067] In this embodiment, after the photodiode PD obtains the light signal, it is converted into a sampling current. The resistance unit 321 and the second operational amplifier AMP2 form a transimpedance amplifier, and the sampling current is converted into voltage to output a voltage feedback signal. The ratio of the voltage feedback signal to the sampling resistance is the impedance of the resistance unit 321, and the sampling current is the product of the photoelectric conversion sensitivity of the photodiode PD and the size of the light signal.

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

[0069] Vfb is a 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 light output power P0 of the light source emitting board 20 is Vref / (K1×K3×R0), wherein K1×K3×R0 is a fixed value. When the reference voltage Vref remains unchanged, the total light output power of the light source emitting board 20 remains constant, and the light output of the light source emitting board 20 is constant.

[0071] The light source transmitting plate 20 and the light source receiving plate 30 can be provided with one or more according to the working requirements of the optical machine module 100. In an optional embodiment, Figure 4 As shown, the light source emitting panels 20 include a plurality, the light source receiving panels 30 include a plurality, and the plurality of light source emitting panels 20 and the plurality of light source receiving panels 30 are arranged in a one-to-one correspondence.

[0072] Each light source emitting board 20 can generate light signals of different colors and wavelengths, such as red light, green light, blue light, purple light, etc. Each light source emitting board 20 is arranged corresponding to the first light source receiving board 30. The light source receiving board 30 receives the light signal emitted by the matching light source emitting board 20 and converts it into a voltage feedback signal.

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

[0074] When multiple light source emitting boards 20 and light source receiving boards 30 are provided, one or more constant power control boards 200 may be provided. In order to reduce the design cost, in an optional embodiment, 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 , and each constant power control circuit 220 is connected to a light source transmitting board 20 and a light source receiving board 30 , respectively.

[0075] When the light source emitting board 20 and the light source receiving board 30 are both a group, the constant power control circuit 220 includes one; when the light source emitting board 20 and the light source receiving board 30 include multiple groups, the number of constant power control circuits 220 is set to the same number as the light source emitting board 20.

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

[0077] The constant power control circuit 220 may be an operational amplifier, a comparator, etc. In an optional embodiment, Figure 8 As shown, the constant power control circuit 220 includes a first operational amplifier AMP1 and a power tube M1;

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

[0079] The power tube M1 may be a corresponding switch tube. In an optional embodiment, the power tube M1 is an NMOS tube.

[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 tube M1, and the power tube M1 outputs a positively correlated current signal according to the voltage comparison signal.

[0081] When the current signal becomes larger, the light signal becomes larger, and the voltage feedback signal becomes larger. At this time, the voltage comparison signal output by the first operational amplifier AMP1 becomes smaller, thereby reducing the current signal. When the current signal becomes smaller, the light signal becomes smaller, and the voltage feedback signal becomes smaller. At this time, the voltage comparison signal output by the first operational amplifier AMP1 becomes larger, thereby increasing the current signal, until the voltage feedback signal is equal to the reference voltage Vref, and finally the light output of the light source emitting panel 20 is constant.

[0082] Furthermore, under different requirements, a single light source emitting board 20 can emit light signals of different strengths, or multiple light source emitting boards 20 can adjust the proportion of light output of different light signals under different light output modes and light output color requirements. In an optional embodiment, Figure 7 As shown, in order to adjust the size of the optical signal, the constant power control board 200 also includes:

[0083] A controller 230, configured to output a voltage regulation signal;

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

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

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

[0087] For example, assuming that the light source transmitting board 20 and the light source receiving board 30 include four groups, the constant power control circuit 220 includes four, and the endoscope system has multiple light output modes. In each light output mode, the light output ratios of the multiple groups are different. Assuming that the light output ratio of each group is 1:1:1:1, under the same structure of the components on the light source transmitting board 20 and the light source receiving board 30, the voltage output circuit 240 can be configured to output four reference voltages Vref of equal size to the four constant power control circuits 220. When the reference voltage Vref changes, the total light output power of the light source transmitting board 20 changes, and four optical 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, under the same structure of the components on the light source transmitting 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 transmitting board 20 changes, and four optical signals with a light output ratio of 1:2:3:4 are output.

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

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

[0091] In order to simplify the structure of the endoscope light source device, in an optional embodiment, the adjustable resistance 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 outputs resistors of different resistance values ​​to the inverting input and output ends of the second operational amplifier AMP2 based on different resistance adjustment signals. When the resistance value of the adjustable resistor circuit switching output becomes larger, the total light output power P0 of the light source emitting board 20 becomes smaller and the light signal becomes stronger. When the resistance value of the adjustable resistor circuit switching output becomes smaller, the total light output power P0 of the light source emitting board 20 becomes larger and the light signal becomes weaker.

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

[0094] Therefore, in different light emission modes, when the light emission ratios of the 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 resistance value of the resistor unit 321 on one of the light source receiving boards 30 is kept fixed, and the resistance value of the resistor unit 321 on the remaining light source receiving boards 30 is adjusted, so as to achieve a constant total light output power of one of the light source emitting boards 20, and adjust the total light output power of the remaining light source emitting boards 20 to achieve the adjustment of the 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, the constant power control circuit 220 includes four, and the endoscope system has multiple light output modes. In each light output mode, the light output ratios of the multiple groups are different. Assuming that the light output ratio of each group is 1:1:1:1, when the components on the light source emitting board 20 are the same and the reference voltages Vref on the constant power control boards 200 are the same, different resistance adjustment signals can be configured to be switched to output, thereby configuring the output of four resistors of equal size to the inverting input and output ends of the four second operational amplifiers AMP2. When the resistance value of the resistance unit 321 changes, the total light output power of the light source emitting board 20 changes, and four optical signals with a light output ratio of 1:1:1:1 are output.

[0097] Alternatively, when the light output ratio of each group is 1:2:3:4, when the components on the light source emitting board 20 are the same and the reference voltages Vref on the constant power control boards 200 are the same, different resistance adjustment signals can be configured to be switched to output, thereby configuring the output of four resistors with a ratio of 4:3:2:1 to the inverting input and output ends 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 optical signals with a light output ratio of 1:2:3:4 are output. When the light output ratio is switched from 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 so that their resistance ratio is switched 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 is kept unchanged and can be set to a fixed resistance value, and the remaining three are set to adjustable resistance circuits with variable impedance. The resistance values ​​of the remaining three resistor units 321 are relatively changed so that the resistance ratio of the resistor unit 321 with a fixed resistance value is switched to 4:3:2:1, thereby changing the light output ratio of the total light output power of the four light source emitting panels 20 to 1:2:3:4.

[0099] The adjustable resistance circuit may be composed of a resistance array, a switch array, a sliding rheostat, a variable resistor, etc. In an optional embodiment, Fig.10 As shown, the adjustable resistance circuit includes multiple resistors and a multi-way switch Q1, the first ends of the multiple resistors R2 are connected together to form the first end of the adjustable resistance circuit, the second ends of the multiple resistors R2 are connected to the multiple first ends of the multi-way switch Q1, the second end of the multi-way switch Q1 constitutes the second end of the adjustable resistance circuit, and the first end and the second end of the adjustable resistance circuit are respectively connected one by one to the inverting input end and the output end 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 resistance circuit switches to output resistors R2 with different resistance values ​​to the inverting input and output ends of the second operational amplifier AMP2, thereby reversely adjusting the light output power and light output size of the light source emitting panel 20.

[0101] The switch Q1 can be a switch device with controlled on-off, such as a triode, a MOS tube, etc., and the specific structure is not limited.

[0102] In addition, a corresponding lens may be disposed between the light entrance hole and the light exit port 12 in the optical machine housing 10 to perform light focusing and emission. Figure 4 As shown, in an optional embodiment, the housing further has an accommodating space 15 communicating with the light entrance 11 and the light exit 12 .

[0103] The optical machine module 100 further includes:

[0104] A plurality of incident lens groups 40, the incident lens groups 40 are arranged in the accommodation space, each incident lens group 40 corresponds to the emission end of each light source emitting board 20, and the incident lens group 40 is used to converge the light signal emitted by the corresponding light source emitting board 20 to the main light path;

[0105] The coupling lens assembly 50 is disposed in the accommodating space, and the coupling lens assembly 50 corresponds to the light outlet 12 .

[0106] The number of incident lens groups 40 matches the number of light source emitting boards 20, and the incident lens group 40 is arranged in the accommodating space, and the incident lens group 40 corresponds to the exit end of the light source emitting board 20. The incident lens group 40 is used to converge the light beam emitted from the exit end of the light source emitting board 20 to the main light path. The incident lens group 40 can be a collimating lens group, as well as other optical lens elements with a collimating function. Alternatively, the incident lens group 40 can also be a diffusion or convergence lens group, in which case the diffused light beam or the converged light beam is close to parallel, so that the utilization rate of the light beam in the main light path reaches a higher level.

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

[0108] A corresponding lens 60 may be arranged near the coupling lens group and the light outlet to achieve functions such as windproof, dustproof, and waterproof.

[0109] The light source receiving plate 30 may be disposed on the side of the main light path to receive a corresponding partial light signal, where the partial light signal may be a stray light signal or a partial light signal formed by light splitting.

[0110] In an alternative embodiment, if Fig.10 As shown, the optical machine module 100 also includes:

[0111] A plurality of beam splitter groups 70 are provided in the accommodating space and are located on the light output path of each light source emitting board 20. The beam splitter group 70 is used to split the light signal emitted by the corresponding light source emitting board 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 board 30.

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

[0113] The number of the beam splitter groups 70 is set based on the corresponding settings of the light source emitting plates 20, wherein the beam splitter group 70 can be set between each group of the light source emitting plates 20 and the light source receiving plates 30, or the beam splitter group 70 can be set between one or more groups of the light source emitting plates 20 and the light source receiving plates 30, and the specific number of settings is not limited.

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

[0115] The dichroic mirror assembly 80 is used to converge the light beams emitted from the emitting ends of the light source emitting panels 20 , and transmit the finally converged light beams to the coupling mirror assembly 50 .

[0116] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the above-mentioned endoscope light source device includes an optical machine module 100 and a constant power control board 200, the optical machine module 100 includes an optical machine housing 10, a light source emitting board 20 and a light source receiving board 30 arranged in the optical machine housing 10, the constant power control board 200 is respectively connected to the light source emitting board 20 and the light source receiving board 30, the light source emitting board 20 drives the light to emit light based on the received current signal, the light source receiving board 30 obtains 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 board 20 based on the voltage feedback signal, thereby realizing constant power regulation, indirectly determining the size of the current signal by obtaining the size of the light signal, and realizing feedback regulation, thereby improving the accuracy of current control, and thus ensuring the constant light output of the endoscope light source device.

[0117] The second aspect of an embodiment of the present invention proposes 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 refers to the above-mentioned embodiment. Since the endoscope system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0118] The endoscope light source device is used to generate light for illumination, and irradiate the light 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. The image information is transmitted to the image processing device for further processing of the image signal and displayed on the display.

[0119] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An endoscope light source device, characterized in that: include: Optical machine module (100) and constant power control board (200); The optical machine module (100) comprises an optical machine housing (10), a light source emitting board (20) and a light source receiving board (30) arranged on the optical machine housing (10); the optical machine housing (10) has a light inlet (11) and a light outlet (12) for incident and emitted light signals; The light source emitting board (20) is arranged at the light entrance (11), and the light source emitting board (20) is used to emit a light signal with a related change based on the received current signal; The light source receiving board (30) is arranged in the optical machine housing (10), and the light source receiving board (30) is used to receive part of the light signal and convert it into a voltage feedback signal; The constant power control board (200) is arranged separately from the optical machine module (100) and is respectively connected to the light source emitting board (20) and the light source receiving board (30) via signal lines. The constant power control board (200) is used to adjust the current signal based on the voltage feedback signal feedback, so as to drive the light source emitting board (20) with constant power.

2. The endoscope light source device according to claim 1, wherein: The light source emitting plates (20) include a plurality of plates, and the light source receiving plates (30) include a plurality of plates; The plurality of light source emitting panels (20) and the plurality of light source receiving panels (30) are arranged in one-to-one correspondence.

3. The endoscope light source device according to claim 1 or 2, characterized in that: 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 of the constant power control circuits (220) is respectively connected to a light source transmitting board (20) and a light source receiving board (30).

4. The endoscope light source device according to claim 3, characterized in that: The constant power control circuit (220) comprises a first operational amplifier (AMP1) and a power tube (M1); The non-phase input terminal of the first operational amplifier (AMP1) is used to input a reference voltage, the inverting input terminal of the first operational amplifier (AMP1) is used to input the voltage feedback signal, the output terminal of the first operational amplifier (AMP1) is connected to the control terminal of the power tube (M1), the first terminal of the power tube (M1) is used to input an operating voltage, and the second terminal of the power tube (M1) is used to output the current signal.

5. The endoscope light source device according to claim 4, characterized in that: The constant power control board (200) further comprises: A controller (230) for outputting a voltage regulation signal; The voltage output circuit (240) is respectively connected to the controller (230) and the plurality of constant power control circuits (220), and the voltage output circuit (240) outputs a plurality of reference voltages of corresponding voltage magnitudes to the plurality of constant power control circuits (220) based on the voltage regulation signal.

6. The endoscope light source device according to claim 1, wherein: The light source emitting board (20) comprises a second circuit board (21) and a light emitting diode (D1) arranged on the second circuit board (21).

7. The endoscope light source device according to claim 5, characterized in that: 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).

8. The endoscope light source device according to claim 7, characterized in that: The photoelectric conversion circuit (32) comprises a photodiode (PD), a resistor 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 end of the second operational amplifier (AMP2) are connected, the cathode of the photodiode (PD) and the non-inverting input end of the second operational amplifier (AMP2) are connected and grounded, the second end of the resistance unit (321) and the output end of the second operational amplifier (AMP2) are connected to form the output end of the photoelectric conversion circuit (32), and the resistance unit (321) has a preset impedance.

9. The endoscope light source device according to claim 8, characterized in that: The light source receiving plates (30) include N pieces; The resistance units (321) of the N light source receiving boards (30) are all adjustable resistance circuits, and the adjustable resistance circuits are also connected to the constant power control board (200); Alternatively, each of the resistance units (321) of the N-1 light source receiving panels (30) is an adjustable resistance circuit, and the adjustable resistance circuit is also connected to the constant power control panel (200); N is a positive integer greater than 1; The adjustable resistance circuit has multiple switchable impedances with different resistance values.

10. The endoscope light source device according to claim 9, wherein: The adjustable resistance circuit comprises a plurality of resistors and a multi-way switch (K1); the first ends of the plurality of resistors (R2) are connected together to form the first end of the adjustable resistance circuit; the second ends of the plurality of resistors (R2) are connected to the plurality of first ends of the multi-way switch (K1); the second end of the multi-way switch (K1) forms the second end of the adjustable resistance circuit; and the first end and the second end of the adjustable resistance circuit are respectively connected one by one to the inverting input end and the output end of the second operational amplifier (AMP2).

11. An endoscope system, characterized in that: The invention comprises an image processing device, an endoscope, and the endoscope light source device according to any one of claims 1 to 10.

Images