Endoscope light source capable of finely adjusting light under low brightness

Abstract

The utility model provides an endoscope light source capable of fine dimming under low brightness, which comprises an LED light source and a control panel, and the emergent end of the LED light source is sequentially provided with a first convergent lens, a collimating lens, a photoelectric atomization slide and a second convergent lens; the control panel comprises an LED light source driving module, a dimming glass voltage adjusting module and a control module, and the LED light source driving module and the dimming glass voltage adjusting module are electrically connected with the control module; the photoelectric atomization slide is provided with a voltage regulation electrode, and the voltage regulation electrode is electrically connected with the dimming glass voltage regulation module. With the adoption of the technical scheme, high-precision and high-stability dimming under the condition of low brightness is realized by combining current regulation of the LED light source and voltage regulation of the photoelectric atomization slide, so that the requirement of a doctor on fine dimming in endoscopy is met; light source stability is enhanced, and light intensity fluctuation is reduced.

Description

Technical Field

[0001] This utility model relates to a dimming device, and more particularly to an endoscope light source that can be finely dimmed under low brightness. Background Technology

[0002] As an important tool in modern medical diagnosis, the light source system of endoscopes directly affects the doctor's observation effect and diagnostic accuracy. Most existing endoscope light source dimming systems use mechanical light shields or single LED current adjustment methods. These methods have significant shortcomings in terms of adjustment accuracy, response speed, and low brightness stability, especially in achieving fine dimming under low brightness conditions (such as below 5%).

[0003] Currently, there are some endoscope light source systems on the market that adjust brightness by changing the LED light source current. However, when it is necessary to adjust to extremely low brightness (such as below 5%), simply adjusting the current is insufficient to meet the requirements of high-precision dimming, because the output characteristics of the LED light source may become unstable at low current, and there is a minimum operating current limitation. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model discloses an endoscope light source capable of finely adjusting brightness under low-brightness conditions, achieving high-precision and high-stability dimming. Here, "low brightness" refers to brightness below 5%.

[0005] The technical solution of this utility model is as follows:

[0006] An endoscope light source with fine dimming capability under low brightness includes an LED light source and a control board. The emitting end of the LED light source is sequentially provided with a first converging lens, a collimating lens, a photoelectric atomizing glass slide, and a second converging lens. The control board includes an LED light source driving module, a dimming glass voltage adjustment module, and a control module. The LED light source driving module, the dimming glass voltage adjustment module, and the control module are electrically connected. The photoelectric atomizing glass slide is provided with a voltage regulating electrode, which is electrically connected to the dimming glass voltage adjustment module.

[0007] Using this technical solution, when the brightness is high, the light intensity can be adjusted by adjusting the LED current. When the brightness is low, such as below 5%, the transmittance can be adjusted by adjusting the voltage of the dimming glass to achieve fine adjustment of the light intensity. Combining these two strategies achieves full coverage and high-precision control of brightness adjustment.

[0008] As a further improvement of this utility model, the photoelectric atomizing glass slide is provided with two voltage regulating electrodes, which are symmetrically located at the upper and lower parts of the photoelectric atomizing glass slide, respectively.

[0009] As a further improvement of this utility model, the dimming glass voltage adjustment module includes a full-bridge drive circuit, a voltage regulation circuit, and a step-down circuit. The voltage regulation circuit includes a transformer T1 and a common-mode inductor L2. The L_VS and R_VS terminals of the full-bridge drive circuit are electrically connected to the primary winding of the transformer T1. The secondary winding of the transformer T1 is electrically connected to the two input terminals of the common-mode inductor L2. The two output terminals of the common-mode inductor L2 are connected in parallel with capacitors C5, C4, and C3, and are electrically connected to the voltage regulation electrode. The two ends of capacitor C3 are respectively connected to the input terminals of the diode rectifier bridge. The output terminals of the diode rectifier bridge are respectively connected to the two ends of potentiometer Rp1 through resistors R22 and R23. One end of potentiometer Rp1 is grounded. The variable resistance output terminal of potentiometer Rp1 is grounded through capacitor C6. The variable resistance output terminal of potentiometer Rp1 is electrically connected to the control module. The step-down circuit is electrically connected to the control module.

[0010] As a further improvement of this utility model, the control module includes a control chip M1, which includes a V_FB terminal. The variable resistor output terminal of the potentiometer Rp1 is electrically connected to the V_FB terminal of the control chip M1. Using this technical solution, by inputting a signal and controlling the voltage at the V_FB terminal through the control chip, the voltage of the dimming glass can be adjusted. This allows for high-precision adjustment of the endoscope light source brightness as needed, for example, when the brightness is below 5%.

[0011] As a further improvement of this utility model, the LED light source driving module includes a boost circuit, a white LED driving circuit, and an LED dimming circuit. The boost circuit includes a boost chip TPS43060RTER, the white LED driving circuit includes a buck chip TPS92640PWPR, and the LED dimming circuit includes a PWM dimming module.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The technical solution of this utility model combines LED light source current adjustment and photoelectric atomizing glass slide voltage adjustment to achieve high-precision and high-stability dimming under low brightness conditions, so as to meet the fine dimming needs of doctors in endoscopic examinations; enhance the stability of the light source and reduce light intensity fluctuations; simplify the system structure, reduce complexity and cost, and improve the reliability and maintainability of the equipment. Attached Figure Description

[0014] Figure 1 This is an optical path diagram of an endoscope light source that can be finely dimmed under low brightness, according to an embodiment of this utility model.

[0015] Figure 2 This is a circuit diagram of the voltage regulation circuit according to an embodiment of the present invention.

[0016] Figure 3 This is a circuit diagram of the full-bridge drive circuit according to an embodiment of the present invention.

[0017] Figure 4 This is a circuit diagram of the step-down circuit and control module according to an embodiment of the present invention.

[0018] Figure 5 This is a circuit diagram of the boost circuit according to an embodiment of the present invention.

[0019] Figure 6 This is a circuit diagram of a white LED driving circuit according to an embodiment of the present invention.

[0020] Figure 7 This is a circuit diagram of the LED dimming circuit according to an embodiment of the present invention.

[0021] Figure 8 This is a circuit diagram of the reverse connection protection circuit according to an embodiment of the present invention.

[0022] Figure 9 This is a circuit diagram of the 5V module according to an embodiment of the present invention.

[0023] The reference numerals in the figures include:

[0024] 1-LED light source, 2-first converging lens, 3-collimating lens, 4-photoelectric atomizing glass plate, 5-second converging lens, 6-voltage regulating electrode. Detailed Implementation

[0025] The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, an endoscope light source with fine dimming capability under low brightness includes an LED light source 1 and a control board. The emitting end of the LED light source 1 is sequentially provided with a first converging lens 2, a collimating lens 3, a photoelectric atomizing glass slide 4, and a second converging lens 5. The control board includes an LED light source 1 driving module, a dimming glass voltage adjustment module, and a control module. The LED light source 1 driving module, the dimming glass voltage adjustment module, and the control module are electrically connected. The photoelectric atomizing glass slide 4 is provided with a voltage regulating electrode 6, which is electrically connected to the dimming glass voltage adjustment module. Further, the photoelectric atomizing glass slide 4 is provided with two voltage regulating electrodes 6, which are symmetrically located at the upper and lower parts of the photoelectric atomizing glass slide 4, respectively. The LED light source 1 driving module uses a circuit from the prior art.

[0027] The dimming glass voltage regulation module includes a full-bridge drive circuit, a voltage regulation circuit, and a step-down circuit. The voltage regulation circuit includes a transformer T1 and a common-mode inductor L2. The L_VS and R_VS terminals of the full-bridge drive circuit are electrically connected to the primary winding of the transformer T1. The secondary winding of the transformer T1 is electrically connected to the two input terminals of the common-mode inductor L2. The two output terminals of the common-mode inductor L2 are connected in parallel with capacitors C5, C4, and C3, and are electrically connected to the voltage regulation electrode. The two ends of capacitor C3 are respectively connected to the input terminals of the diode rectifier bridge. The output terminals of the diode rectifier bridge are respectively connected to the two ends of potentiometer Rp1 through resistors R22 and R23. One end of potentiometer Rp1 is grounded. The variable resistance output terminal of potentiometer Rp1 is grounded through capacitor C6. The variable resistance output terminal of potentiometer Rp1 is electrically connected to the control module. The step-down circuit is electrically connected to the control module and provides power to the control module. The full-bridge drive circuit, voltage regulation circuit, buck circuit, and control module circuitry utilize existing technology; see details below. Figures 2-4 As shown.

[0028] The control module includes a control chip M1, which has a V_FB terminal. The variable resistor output terminal of the potentiometer Rp1 is electrically connected to the V_FB terminal of the control chip M1. The control chip M1 is model EGS002.

[0029] The LED light source driving module includes a boost circuit, a white LED driving circuit, an LED dimming circuit, a reverse connection protection circuit, and a 5V module. Each circuit utilizes existing technology, as detailed below. Figures 5-9 As shown. The boost circuit includes a boost chip TPS43060RTER, the white LED driver circuit includes a buck chip TPS92640PWPR, and the LED dimming circuit includes a PWM dimming module. A 12V power supply is input from the Vin & GND terminals, boosted to 16.5V by the TPS43060RTER, and then stepped down to 13.5V by the TPS92640PWPR to drive the LED. LED dimming methods include PWM dimming and potentiometer dimming.

[0030] This embodiment can achieve high-precision dimming at low brightness in the following way:

[0031] Initial light source adjustment: The operating current of the LED light source is adjusted by the LED light source driver module to achieve initial brightness adjustment.

[0032] Optical collimation: By using converging lenses and collimating lenses, LED light is converted into parallel light, ensuring the stability of light transmission.

[0033] High to medium brightness adjustment: The LED current is adjusted by the LED light source driver module to meet the adjustment requirements of medium or high brightness.

[0034] Fine dimming at low brightness: When low brightness is required, such as below 5%, the voltage at the output of the variable resistor of potentiometer Rp1 is adjusted by controlling the V_FB terminal of the control chip M1. The voltage applied to the dimming glass controls its light transmittance, thus achieving high-precision dimming at low brightness.

[0035] Final convergence: The adjusted light is focused onto the end of the beam guide by a second converging lens and finally output by the beam guide.

[0036] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "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.

[0037] 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.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the shape and structure of this utility model are within the protection scope of this utility model.

Claims

1. An endoscope light source with finely adjustable brightness under low light conditions, characterized in that: It includes an LED light source and a control board. The emitting end of the LED light source is provided with a first converging lens, a collimating lens, a photoelectric atomizing glass plate, and a second converging lens in sequence. The control board includes an LED light source driving module, a dimming glass voltage adjustment module, and a control module. The LED light source driving module, the dimming glass voltage adjustment module, and the control module are electrically connected. The photoelectric atomizing glass plate is provided with a voltage regulating electrode, which is electrically connected to the dimming glass voltage adjustment module.

2. The endoscope light source with fine dimming capability under low brightness according to claim 1, characterized in that: The photoelectric atomizing glass slide is provided with two voltage regulating electrodes, which are symmetrically located at the upper and lower parts of the photoelectric atomizing glass slide, respectively.

3. The endoscope light source with fine dimming capability under low brightness according to claim 2, characterized in that: The dimming glass voltage regulation module includes a full-bridge drive circuit, a voltage regulation circuit, and a step-down circuit. The voltage regulation circuit includes a transformer T1 and a common-mode inductor L2. The L_VS and R_VS terminals of the full-bridge drive circuit are electrically connected to the primary winding of the transformer T1, and the secondary winding of the transformer T1 is electrically connected to the two input terminals of the common-mode inductor L2. The two output terminals of the common-mode inductor L2 are connected in parallel with capacitors C5, C4, and C3, and are electrically connected to the voltage regulating electrode. The two ends of capacitor C3 are respectively connected to the input terminals of the diode rectifier bridge. The output terminals of the diode rectifier bridge are respectively connected to the two ends of potentiometer Rp1 through resistors R22 and R23. One end of potentiometer Rp1 is grounded. The variable resistance output terminal of potentiometer Rp1 is grounded through capacitor C6. The variable resistance output terminal of potentiometer Rp1 is electrically connected to the control module. The step-down circuit is electrically connected to the control module.

4. The endoscope light source with fine dimming capability under low brightness according to claim 3, characterized in that: The control module includes a control chip M1, which includes a V_FB terminal. The variable resistor output terminal of the potentiometer Rp1 is electrically connected to the V_FB terminal of the control chip M1.

5. The endoscope light source with fine dimming capability under low brightness according to claim 4, characterized in that: The LED light source driving module includes a boost circuit, a white LED driving circuit, and an LED dimming circuit. The boost circuit includes a boost chip TPS43060RTER, the white LED driving circuit includes a buck chip TPS92640PWPR, and the LED dimming circuit includes a PWM dimming module.

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