CN217240747U - Camera lens filtering interference circuit and medical instrument equipment - Google Patents
Camera lens filtering interference circuit and medical instrument equipment Download PDFInfo
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- CN217240747U CN217240747U CN202220758621.6U CN202220758621U CN217240747U CN 217240747 U CN217240747 U CN 217240747U CN 202220758621 U CN202220758621 U CN 202220758621U CN 217240747 U CN217240747 U CN 217240747U
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Abstract
The utility model discloses a camera lens filtering interference circuit and medical instrument equipment. The filtering circuit comprises a first resistor, a first capacitor and a second capacitor, wherein one end of the first resistor is connected with a clock port of the lens acquisition equipment and one end of the first capacitor, the other end of the first resistor is connected with a clock port of the image processing equipment and one end of the second capacitor, and the other ends of the first capacitor and the second capacitor are grounded. The utility model discloses the scheme is simple, and it is convenient to realize, can effectively avoid electric fast transient pulse crowd or conduction to disturb the electromagnetic compatibility or the electric safety project production unusual influence to medical instrument.
Description
Technical Field
The utility model belongs to the technical field of electromagnetic compatibility, concretely relates to camera lens filtering interference circuit and medical instrument equipment.
Background
The electromagnetic compatibility standard of the medical equipment is in accordance with the requirements of YY 0505-2012. The electric fast transient pulse group project applies +/-2 KV/100k omega to the medical equipment on a power line, the conducted immunity project applies a test level of 3V (effective value) to the medical equipment, the frequency is 150kHz-80MHz on a power line and a signal line, and the function of the medical equipment cannot be influenced.
At present, the image video medical equipment of electronic endoscopes is sensitive in transmitted signals and easy to receive external interference, if the signals are not filtered and the interference is directly transmitted to a professional medical instrument detection mechanism for detection, problems occur, and if a circuit is added, the previous detected items can be rechecked and the design is changed, so that the problems are not compensated.
Because the medical equipment is the equipment concerning the life of the patient and the user, if the equipment is easily interfered, a doctor can generate image video abnormity due to interference of a high-frequency operation equipment and other strong interference sources to the electronic endoscope in the process of operating the patient, and further the operation is influenced.
The YY 0505-2012 of the medical equipment is forced to be executed now, that is, the medical equipment needs to detect the electric fast transient pulse group and the conduction immunity before sending the medical equipment to the professional medical equipment detection mechanism.
The electric fast transient pulse group test applies +/-2 KV/100k omega to medical equipment on a power line, and the electronic endoscope is not required to have abnormal influences on doctor operations such as screen blacking, screen splash, crash and the like.
Conducting immunity test, applying test level of 3V (effective value) and frequency of 150kHz-80MHz on a power line and a signal line to medical equipment, wherein the electronic endoscope does not have abnormal phenomena such as black screen, flower screen, dead halt, stripes and the like to influence the observation of doctor images; the conducted immunity test criteria are more stringent than the electrical fast transient burst test.
Therefore, how to measure the over-current fast transient pulse burst and the conduction immunity without generating abnormal influence on other items of electromagnetic compatibility and electrical safety of the equipment is a technical problem which needs to be solved urgently by the technical personnel in the technical field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the not enough that above-mentioned background art exists, provide a camera lens filtering interference circuit and medical instrument equipment, can be fast, effectual harass the interference of applying and eliminate electric fast transient pulse crowd or conduction, avoid causing the anomaly to the function of equipment.
The utility model adopts the technical proposal that: the utility model provides a camera lens filtering interference circuit, is including setting up the filtering circuit between camera lens collection equipment and image processing equipment, the filtering circuit includes first resistance, first electric capacity and second electric capacity, the clock port and the first electric capacity one end of camera lens collection equipment are connected to first resistance one end, and the clock port and the second electric capacity one end of image processing equipment are connected to the first resistance other end, the other end of first electric capacity and second electric capacity is all ground connection.
Further, the dimming circuit is arranged between the power supply and the lens lighting device.
Further, the dimming circuit comprises a second resistor, wherein one end of the second resistor is connected with the positive electrode of the power supply, and the other end of the second resistor is connected with the positive electrode of the lens lighting device.
Further, the resistance value of the first resistor is 0.1-1000 omega.
Further, the capacitance value of the first capacitor is 10 pF-100 nF.
Further, the capacitance value of the second capacitor is 10 pF-100 nF.
Further, the resistance value of the second resistor is 100-1200 omega.
Further, the lens is an OV69xx series lens.
The medical equipment comprises the electronic endoscope and the image processing equipment, wherein the lens interference filtering circuit is arranged at one end of the electronic endoscope, which is connected with the image processing equipment, as above.
The utility model discloses set up the circuit structure of the filtering interference of compriseing resistance, electric capacity between electronic endoscope's camera lens and electronic endoscope's image processing equipment, when the external interference source is applyed for equipment and is harassed for electric fast transient pulse crowd or conduction, through resistance absorption interference, electric capacity can filtering interference, and interfering signal can be led away fast to the ground connection in to external ground to reach the purpose of filtering interference. The scheme is simple, convenient to realize and capable of effectively avoiding the influence of the electric fast transient pulse group or the conducted disturbance source on the abnormity of the electromagnetic compatibility or the electric safety items of the medical apparatus.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Fig. 2 is not added the image of the medical apparatus and instrument equipment during the test of the electrical fast transient pulse group when the interference circuit of the lens filtering is applied.
Fig. 3 is an image added after the interference circuit of the lens filtering of the utility model is applied to the medical equipment during the test of the electrical fast transient pulse group.
Fig. 4 is an image of the medical equipment when applying the conduction disturbance test without adding the lens filtering disturbance circuit of the present invention.
Fig. 5 is an image of the medical equipment when applying the conduction disturbance test after adding the lens filtering disturbance circuit of the utility model.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
When an external electric fast transient pulse group or disturbance is applied to equipment, because signals of image and video equipment such as an electronic endoscope and the like are sensitive, an EFT interference signal of +/-2 KV/100k omega is applied to a power supply, the interference signal can generate high-potential and high-frequency interference signals in the direction of radiation and conduction respectively, and an accumulation effect can be generated if the interference signals are not released immediately. Conducted disturbance signals with a power supply and signal test level of 3V (effective value) and a frequency of 150kHz-80MHz can cause the disturbance signals to generate low-potential and wide-range frequency disturbance signals from the direction of radiation and conduction respectively, and can also generate accumulation effect if not released immediately.
In order to eliminate the effectual interference of exerting to electric fast transient pulse group or conduction harassment, as shown in fig. 1, the utility model provides a camera lens filtering interference circuit, the camera lens is OV69xx series camera lens, and it contains the camera lens collection equipment of gathering the image, and camera lens collection equipment includes a plurality of ports, specifically is clock port clk', output port out, add port, ground connection port GND. The filtering interference circuit comprises a filtering circuit arranged between the lens acquisition equipment and the image processing equipment, the filtering circuit comprises a first resistor, a first capacitor and a second capacitor, one end of the first resistor is connected with a clock port of the lens acquisition equipment and one end of the first capacitor, the other end of the first resistor is connected with a clock port of the image processing equipment and one end of the second capacitor, and the other ends of the first capacitor and the second capacitor are all grounded. The image processing apparatus is a conventional image processor.
The utility model discloses set up the circuit structure of the filtering interference of compriseing resistance, electric capacity between electronic endoscope's camera lens and electronic endoscope's image processing equipment, when the external interference source is applyed for equipment and is harassed for electric fast transient pulse crowd or conduction, through resistance absorption interference, electric capacity can filtering interference, and interfering signal can be led away fast to the ground connection in to external ground to reach the purpose of filtering interference.
In the above scheme, when the device applies interference externally, the first resistor can absorb the interference, but since the resistance of the resistor on clk is not too large, the resistance is selected to be 0.1 Ω -1000 Ω, the clk signal itself is distorted due to too large resistance, clk itself is a small signal, and the power is selected to be 0.1W-0.5W through testing. The first capacitor and the second capacitor can filter interference to the ground, the capacitance value of the capacitors is not suitable to be too large and is selected to be 10 pF-100 nF, clk signals are distorted due to too large capacitance value, clk is low-level signals, and the withstand voltage value is selected to be 12V-24V through tests.
In the above solution, the lens may also include a lens illumination device for illuminating the captured image, which is an LED lamp, and the lens illumination device has a positive port LED + 'and a negative port LED-' (the negative electrode is not shown in the figure). The filtering interference circuit further comprises a dimming circuit, and the dimming circuit is arranged between the power supply and the lens lighting equipment. The dimming circuit comprises a second resistor, one end of the second resistor is connected with the positive electrode of the power supply, and the other end of the second resistor is connected with the positive electrode of the lens lighting device. The second resistor is used for adjusting the illumination brightness of the OVxx series lens, and the value range of the second resistor is 100-1200 omega and the power is 0.3-0.6W because the power supply voltage is 6V, the current range of the led is 5-60 mA and the power of the led is 0.25W.
The utility model also provides a medical equipment, including electronic endoscope and image processing equipment, the one end that image processing equipment was connected to electronic endoscope's camera lens is equipped with as above camera lens filtering interference circuit.
The utility model discloses a resistance can absorb and come from the external world and apply electric fast transient pulse crowd and conduction disturbance, first electric capacity and second electric capacity can be filtered and come from the external world and apply electric fast transient pulse crowd and conduction noise immunity disturbance, the resistance can be passed through and do not exert influence to original signal by the interference of resistance low frequency part when bringing from the external electric fast transient pulse crowd who applys and conduction noise immunity disturbance, first electric capacity can be in OVxx series lens input acquisition signal and ground between form the route, the second electric capacity can form the route between OVxx series lens output signal and ground, ground includes clk _ GND, Vou _ GND, Add _ GND, GND, PGND and above-mentioned ground are parallelly connected together at last and form the ground network, impedance low itself can be fast with disturbing the external world and do not let the interference accumulate on medical instrument and then produce unusual influence to the function. Compare fig. 2 and fig. 3, fig. 4 and fig. 5, can obviously see out, increase on the medical instrument equipment the utility model discloses a behind the camera lens filtering interference circuit, exert external electric fast transient pulse crowd and conduction harass to it, the image quality on the display has obvious promotion.
The circuit of the utility model is a linear circuit, and does not increase the high-frequency circuit so that the electromagnetic compatibility to the whole medical equipment can not affect basically.
The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered within the protection scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A lens interference filtering circuit is characterized in that: including setting up the filtering circuit between camera lens collection equipment and image processing equipment, the filtering circuit includes first resistance, first electric capacity and second electric capacity, the clock port and the first electric capacity one end of camera lens collection equipment are connected to first resistance one end, and the clock port and the second electric capacity one end of image processing equipment are connected to the first resistance other end, the other end of first electric capacity and second electric capacity is ground connection all.
2. The lens interference rejection circuit according to claim 1, wherein: the resistance value of the first resistor is 0.1-1000 omega.
3. The lens interference rejection circuit according to claim 1, wherein: the capacitance value of the first capacitor is 10 pF-100 nF.
4. The lens interference rejection circuit according to claim 1, wherein: and the capacitance value of the second capacitor is 10 pF-100 nF.
5. The lens interference rejection circuit according to claim 1, wherein: the dimming circuit is arranged between the power supply and the lens lighting equipment.
6. The lens interference rejection circuit according to claim 5, wherein: the dimming circuit comprises a second resistor, one end of the second resistor is connected with the positive electrode of the power supply, and the other end of the second resistor is connected with the positive electrode of the lens lighting device.
7. The lens interference rejection circuit according to claim 6, wherein: the resistance value of the second resistor is 100-1200 omega.
8. The lens interference rejection circuit according to claim 1, wherein: the lens is OV69xx series lens.
9. A medical instrument device comprising an electronic endoscope and an image processing device, characterized in that: the end of the electronic endoscope connected with the image processing equipment is provided with the lens interference filtering circuit according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220758621.6U CN217240747U (en) | 2022-03-30 | 2022-03-30 | Camera lens filtering interference circuit and medical instrument equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220758621.6U CN217240747U (en) | 2022-03-30 | 2022-03-30 | Camera lens filtering interference circuit and medical instrument equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217240747U true CN217240747U (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220758621.6U Active CN217240747U (en) | 2022-03-30 | 2022-03-30 | Camera lens filtering interference circuit and medical instrument equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217240747U (en) |
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2022
- 2022-03-30 CN CN202220758621.6U patent/CN217240747U/en active Active
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