CN115529393A - Low-leakage fax machine - Google Patents
Low-leakage fax machine Download PDFInfo
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- CN115529393A CN115529393A CN202211129670.4A CN202211129670A CN115529393A CN 115529393 A CN115529393 A CN 115529393A CN 202211129670 A CN202211129670 A CN 202211129670A CN 115529393 A CN115529393 A CN 115529393A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00519—Constructional details not otherwise provided for, e.g. housings, covers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00976—Arrangements for regulating environment, e.g. removing static electricity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Environmental & Geological Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to a low-leakage fax machine, which comprises a fax machine body, a first shielding device, a second shielding device and a third shielding device, wherein the first shielding device is arranged on the fax machine body; the first shielding device is used for shielding a power supply board of the fax machine main body; the second shielding device is used for shielding the main control board of the fax machine main body; the third shielding device is used for shielding the operating mechanism of the fax machine main body. The first shielding device, the second shielding device and the third shielding device are arranged to respectively realize shielding treatment of the power supply board, the main control board and the operating mechanism, and information leakage caused by electromagnetic wave radiation is avoided.
Description
Technical Field
The invention relates to the technical field of electromagnetic wave information protection of fax machines, in particular to a low-leakage fax machine.
Background
With the acceleration of the informatization process, the application of information processing equipment is more and more extensive, and when the information processing equipment works, the information processing equipment can not only generate electromagnetic radiation, but also generate electromagnetic information leakage, so that confidential information is stolen and restored, and a divulgence event is caused. The electromagnetic protection level of the common fax machine is not high, a large amount of electromagnetic wave leakage is accompanied during working, the radiation frequency is from low frequency to high frequency, and the wave source comprises magnetic field waves, electric field waves and electromagnetic waves. Research shows that the electromagnetic wave radiated by the existing fax machine during operation can be intercepted and restored within one kilometer, and if high-sensitivity equipment is used, the maximum intercepted distance is far.
Disclosure of Invention
In view of this, the present invention provides a low-leakage fax machine to avoid the problem of information leakage caused by electromagnetic wave radiation and improve the security of the fax machine.
In order to achieve the purpose, the invention provides the following scheme:
a low-leakage fax machine comprises a fax machine body, a first shielding device, a second shielding device and a third shielding device;
the first shielding device is used for shielding a power supply board of the fax machine main body;
the second shielding device is used for shielding the main control board of the fax machine main body;
the third shielding device is used for shielding the operating mechanism of the fax machine main body.
Optionally, the first shielding device includes a shielding tray and a first shielding cover;
the power supply board is arranged in a first shielding cavity formed by connecting the shielding tray and the first shielding cover;
aluminum foil conductive foam is arranged at the contact position between the shielding tray and the first shielding cover;
a plurality of openings are formed in the shielding tray, and the openings are used for enabling a plurality of groove-shaped photoelectric sensors of the power supply board to be positioned outside the shielding tray and the first shielding cover;
the shielding tray and the first shielding cover are made of cold-rolled steel plates;
the power line connected with the power supply board is a shielding cable;
and an EMI filter is arranged at the input end of the power interface of the fax machine body.
Optionally, the shielding tray is provided with a plurality of cold air inlets, and the first shielding cover is provided with a plurality of hot air outlets;
the diameters of the cold air inlet and the hot air outlet are both 2.5mm;
the distance between two adjacent cold air inlets and the distance between two adjacent hot air outlets are both 5mm.
Optionally, the second shielding device includes: the main control board box body and the second shielding case;
the main control board is arranged in a second shielding cavity formed by connecting the main control board box body and the second shielding cover;
aluminum foil conductive foam is arranged at the contact position between the main control board box body and the second shielding case;
the main control board box body and the second shielding case are made of aluminum materials.
Optionally, an annular fixing block is further disposed on the second shielding cover, and the connector socket on the main control board is located in the annular fixing block;
after the power supply board and the main control board are assembled, a connector plug on the power supply board is connected with a connector socket on the main control board, and the annular fixing block is fastened with a first shielding cover in a first shielding device;
and the contact position between the annular fixed block and the second shielding case and the contact position between the annular fixed block and the first shielding case are both provided with aluminum foil conductive foam.
Optionally, copper plating layers are arranged around the microswitch on the main control board and the periphery of the external interface, and the copper plating layers are lapped with the second shielding case; through holes are formed in the corresponding positions of the micro switch and the external interface on the second shielding cover.
Optionally, the third shielding device comprises a third shielding can and a metal conductive mesh film;
the operating mechanism comprises an operating control panel and an operating panel;
the operation control panel is fixed on the back of the operation panel, and the back of the operation panel is coated with silver-copper conductive paint;
the third shielding cover is bonded with the operation panel through aluminum conductive cloth; the third shielding cover is in contact with the back conductive paint of the operation panel;
the metal conductive net film is adhered to the display window of the operation panel through aluminum conductive cloth;
the operation panel and the function keys on the operation panel are made of ABS materials, and the back surfaces of the function keys are coated with silver-copper conductive paint.
Optionally, silver-copper conductive paint is sprayed inside the casing of the fax machine main body, the main machine casing of the telephone and the handle casing cover;
the telephone line of the telephone is a shielding cable; the outgoing line position of the host of the telephone is provided with omnibearing conductive foam;
and a feed-through filter is arranged at the input end of the connecting wire interface of the telephone receiver of the telephone.
Optionally, the handle case cover, the first shielding device, the second shielding device, and the third shielding device of the host casing are all grounded.
Optionally, an air outlet is arranged on a bracket of the transmission mechanism of the fax machine main body, and an air outlet fan is mounted in the air outlet.
Optionally, an EMI filter is disposed at an input end of the power interface of the fax machine body.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a low-leakage fax machine, which comprises a fax machine body, a first shielding device, a second shielding device and a third shielding device, wherein the first shielding device is arranged on the fax machine body; the first shielding device is used for shielding a power supply board of the fax machine main body; the second shielding device is used for shielding the main control board of the fax machine main body; the third shielding device is used for shielding the operating mechanism of the fax machine main body. The first shielding device, the second shielding device and the third shielding device are arranged to respectively realize shielding treatment of the power supply board, the main control board and the operating mechanism, so that information leakage caused by electromagnetic wave radiation is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic three-dimensional explosion diagram of a facsimile machine host provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first shielding apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second shielding apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a shielding structure of an operation control board in a third shielding apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a shielding structure of a liquid crystal display in a third shielding device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an assembly relationship between a telephone and a housing according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a shielding structure of a telephone host according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a shielding structure of a transmission mechanism according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a positioning boss provided in an embodiment of the present invention;
description of the reference numerals:
1. a switch mode power supply, 2, a main control panel, 3, a fax image input mechanism, 4, a telephone, 5, a case, 6, a fax image output mechanism, 7, a transmission mechanism, 8, a high-performance EMI filter, 9, a paper feeding box, 10, an operation mechanism, 11, a first shielding case, 12, a power supply board, 13, a shielding tray, 14, aluminum foil conductive foam, 15, a groove type photoelectric sensor, 16, a main control panel box, 17, a main control circuit, 18, a second shielding case, 19, an external interface, 20, a micro switch, 21, a connector plug, 22, a connector socket, 23, a ring fixing block, 24, a threaded hole, 25, an operation panel, 26, a function key, 27, an operation control panel, 28, a third shielding case, 29, a liquid crystal display, 30, a metal conductive net film, 31, an aluminum conductive cloth, 32, a telephone host, 33, a telephone handle, 34, an omnibearing conductive foam, 35, a main machine case, 36, a handle case cover, 37, a receiver connecting wire interface, 38, a filter, a transmission mechanism, a fan bracket, 39, a fan bracket, a fan bracket, a positioning boss, a fan and a drum positioning boss.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a low-leakage fax machine, which is used for avoiding the problem of information leakage caused by electromagnetic wave radiation and improving the safety of the fax machine.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment of the invention provides a low-leakage fax machine which comprises a fax machine body, a first shielding device, a second shielding device and a third shielding device.
As shown in fig. 1, the fax machine body comprises a switching power supply 1, a main control panel 2, a fax image input mechanism 3, a telephone 4, a casing 5, a fax image output mechanism 6, a transmission mechanism 7, a high-performance EMI filter 8, a paper feeding box 9, an operating mechanism 10, and a power supply panel 12 arranged in the switching power supply 1.
The switch mode power supply 1 provides energy for the whole machine. The switch mode power supply 1 comprises a power supply board 12, wherein the power supply board 12 is provided with an input filter rectification circuit, a control drive circuit, a switch circuit, a 5V output circuit, a +/-12V output circuit (or a 24V output circuit) and a protection circuit. The switch type power supply can output smooth and stable voltage for normal work of all board cards, modules and mechanisms of the whole machine, the average power output by the power supply is 200W, the standby power is 15W, and the maximum power can reach 500W during work.
The characteristics of analysis power supply board 12, adopt whole shielding to power supply board 12, as shown in fig. 2, design first shield assembly including shielding tray 13 and first shield cover 11, install the cotton 14 of aluminium foil electrically conductive bubble between shielding tray 13 and the first shield cover 11 with the screw-up fixed, satisfy the electric continuity through the extrusion deformation to the cotton 14 of aluminium foil electrically conductive bubble, the effectual electromagnetic wave that blocks power supply board 12 and produce, make power supply board 12 be in an independent shielding cavity (first shielding cavity), reach the requirement of shielding efficiency. When the first shielding case 11 is designed, the groove-shaped photoelectric sensor 15 on the power supply board 12 is independently shielded, the groove-shaped photoelectric sensor 15 is used for detecting and controlling the state of the fax machine, the normal function of the low-leakage fax machine is ensured after independent shielding, and the shielding effectiveness requirement of the low-leakage fax machine is also ensured.
The power supply board 12 generates low frequency electromagnetic waves whose energy is basically composed of magnetic field energy, and in this case, the magnetic field component of the electromagnetic waves should be shielded. The magnetic shield has the function of preventing interference of a low-frequency magnetic field, and the shield body adopts a high-permeability and high-saturation magnetic material to absorb or lose an electromagnetic field so as to achieve the purpose of shielding. High magnetic permeability is important as well as high electric conductivity, and cold-rolled steel is a good conductor, and the magnitude of magnetic permeability is satisfactory, and it is also a relatively inexpensive material that can provide great mechanical strength, so the shielding tray 13 and the first shielding case 11 of the power supply board are made of cold-rolled steel, and satisfactory shielding effectiveness is obtained inexpensively.
For the heat dissipation design of the power supply board 12, a cold air inlet is designed on the shielding tray 13, the size of the hole is a round hole with the diameter of 2.5mm, a hot air outlet is designed on the first shielding cover 11, the size of the hole is a round hole with the diameter of 2.5mm, and when the size of the hole is larger than the wavelength corresponding to the highest interference frequency, electromagnetic waves can pass through without attenuation; the smaller the size of the hole is, the stronger the hole attenuates electromagnetic waves; due to the superposition effect of interference, the shielding effectiveness is worse when the number of holes is more; the smaller the spacing between adjacent holes, the poorer the shielding effectiveness. The design of holes on the shielding tray 13 and the first shielding cover 11 can ensure timely emission of work heat of internal components while meeting shielding efficiency.
The main control board 2 is provided with a main control circuit 17 and a transmission control circuit. The main control circuit 17 controls the operation mode and the state of the facsimile machine. The main control circuit 17 controls the content mainly of sending and receiving fax operations, wherein the sending fax operation comprises fax image scanning input, image data transmission, image data processing and modulation output; the fax receiving operation comprises fax signal receiving, demodulation, storage and output. When the facsimile machine is operated, the main control circuit 17 reads out the program from the ROM and stores the data in the RAM. The transmission control circuit consists of a programmable IO interface and a programmable DMA controller, and has the main function of completing signal transmission by matching with the main control circuit 17.
For the shielding design of the main control board 2, the main control board 2 is integrally shielded. As shown in fig. 3, the second shielding device is designed to include a main control board box 16, the main control board 2 is screwed and fixed on the main control board box 16 by three combination screws, the micro switch 20 and the external interface 19 are welded on the main control board 2, and a copper plating layer with a width of 3mm is designed around the micro switch 20 and the external interface 19. According to the characteristics of the devices on the main control board 2, the second shielding cover 18 with the corresponding shape is designed, and the effective lap joint of the second shielding cover 18 and the copper plating layer on the main control board 2 is ensured. Meanwhile, the aluminum foil conductive foam 14 is additionally arranged between the second shielding cover 18 and the main control board box body 16, the second shielding cover 18 and the main control board box body 16 are screwed and fixed through countersunk screws, the electric continuity is met through the extrusion deformation of the aluminum foil conductive foam 14, and the electromagnetic wave generated by the main control board 2 is effectively blocked, so that the main control board is positioned in an independent shielding cavity (second shielding cavity), the requirement on shielding efficiency can be met, and the functional requirement of the fax machine is met.
The main body of the fax machine supplies power for a main control circuit 17 on a main control panel 2 through a power supply panel 12, a connector plug 21 is arranged on the power supply panel 1, and a connector socket 22 is designed on the main control panel 2. According to the characteristics of the connector socket 22 on the main control board 2, the annular fixing block 23 is designed, the aluminum foil conductive foam 14 is adhered to the front side and the back side of the annular fixing block 23, the annular fixing block 23 and the second shielding case 18 are locked and fixed through countersunk screws, after the power supply board 1 and the main control board 2 are assembled, the aluminum foil conductive foam 14 on the back side of the annular fixing block 23 is ensured to be in close contact with the first shielding case 11, meanwhile, the annular fixing block 23 and the first shielding case 11 are locked through three combined screws, and the electromagnetic shielding requirements of a connection interface of the power supply board 1 and the main control board 2 are met.
Aiming at the interference of a high-frequency electromagnetic field generated by the main control board 2, the shield body is made of a low-resistance metal material, and the shielding metal is used for absorbing and reflecting the electromagnetic field so as to achieve the purpose of shielding. The high frequency (above 1 MHz) electromagnetic wave has not only the electromagnetic induction characteristic of the low frequency electromagnetic wave but also the refractivity and reflectivity of the low frequency electromagnetic wave, and the main control board box 16 and the second shielding cover 18 are made of aluminum with good conductivity.
According to the shielding processing method of the cable, the power line is designed to be a shielding cable, common mode interference current injected into the cable can be guided to the ground through grounding of the shielding layer, signals and cable interfaces in the shielding layer are protected from external interference, the telephone line is designed to be a shielding cable, EMI signals in the telephone line are surrounded in the shielding layer, and the fact that no EMI common mode current exists on the shielding layer of the signal cable is guaranteed.
The casing 5 is made of high-strength, good-toughness and impact-resistant ABS materials and is quickly formed through a 3D printing technology, and the style is attractive. High-quality silver-copper conductive paint is sprayed inside the casing 5, the thickness of the silver-copper conductive paint is 40-60 um, the silver-copper conductive paint is dried at 60 ℃, and the inside of the casing 5 is lapped into a shielding body. The shell 5 and the internal modules are fixed by three combined screws, the contact surface of the three combined screws and the shell is additionally provided with the silver-plated conductive rubber gasket, and the silver-plated conductive rubber gasket is combined with the surface coating on the shell 5, so that good electrical continuity can be provided between the modules, the impedance of the contact point is reduced to the minimum, and the shielding effect of the shell is improved. On the premise that the housing 5 is well shielded, the shielding effect can be achieved only by being matched with grounding for use.
As shown in fig. 1, a high-performance EMI filter 8 is designed at the input terminal of the power interface, which can significantly reduce the level of conducted interference, and prevent various circuits from interfering with each other during the operation of the facsimile machine, so that they can operate compatibly with each other.
As shown in fig. 1, the facsimile image input mechanism 3 is like a scanner, and performs facsimile scanning input and image data processing under the control of signals sent from the main control circuit 17. The facsimile input mechanism consists of facsimile manuscript input transmission mechanism, photoelectric image sensor, analog signal processor, A/D converter and grey correction circuit, gate array, binary system and half tone ROM and memory. When fax is transmitted, a fax draft enters from the transmission mechanism, the photoelectric image sensor converts an image signal on the fax draft into an analog electric signal, the analog electric signal is sent to the analog signal processor for processing, the processed analog electric signal is sent to the A/D converter to be converted into a digital signal, the digital signal is sent to the gate array, and the digital signal is output under the control of an effective line processing signal and a reading processing signal sent by the main control circuit 17.
As shown in fig. 1, the facsimile image output section 6 performs printing and output of the received facsimile document as a printer. The invention exemplarily adopts laser printing which is composed of a laser, a laser lens group, a polygonal rotating mirror and the like. The laser printing process is mainly carried out around the photosensitive drum, and a row of light-emitting LEDs are tightly attached to the photosensitive drum for imaging, so that the cost is reduced. The polygonal rotating prism adopts a quadrangular prism, the highest rotating speed is 2 ten thousand revolutions per minute, the outer surface of the photosensitive drum is a layer of photosensitive material, the material has high resistance in the dark and is insulating, and when light irradiates, the resistance can be sharply reduced to form a conductor. The laser printing process is divided into six steps: charging, exposure, development, transfer, fixing, cleaning. The shell of the fax image output mechanism 7 is sprayed with high-quality silver-copper conductive paint, so that electromagnetic waves generated by the output mechanism 6 are effectively blocked.
As shown in fig. 4, the user observes and operates the operating mechanism 10 to control the working state of the fax machine, and the fax machine operating panel 25 and the function keys 26 are both made of high-strength, good-toughness and impact-resistant ABS material and are rapidly molded by 3D printing technology, so that the fax machine is beautiful in appearance. The hole diameters of the function keys 26 are reduced to an allowable range, and high-quality silver-copper conductive paint is sprayed on the back surfaces of the operation panel 25 and the function keys 26, so that the conductivity inside the operation panel 25 meets the shielding requirement. The operating mechanism 10 is mainly composed of an operation control panel 27, function keys 26 and a liquid crystal display 29.
As shown in fig. 4, for the shielding design of the operation control board 27, an integral shield is adopted for the operation control board 27 inside the operation mechanism 10. The operation control panel 27 is fixed on the back of the operation panel 25 by three combined screws in a screw-mounting manner, and the third shielding cover 28 is designed to ensure that the operation control panel 27 is located in an independent shielding cavity by adhering the aluminum conductive cloth 31 around after the third shielding cover 28 is tightly contacted with the silver-copper conductive paint on the back of the operation panel 25, so that the requirement on shielding effectiveness can be met, and the requirement on the key function of the fax machine can be met. Abundant function button provides convenient for user's operation. Such as multi-level volume adjustment, typing, etc.
As shown in fig. 5, for the shielding design of the liquid crystal display panel 29, a high-transparency metal conductive mesh film 30 is mounted on the display window on the back of the operation panel 25, and the metal conductive mesh film 30 is adhered around an aluminum conductive cloth 31 under the condition of ensuring that the display area is not shielded, so that the electromagnetic emission or the related interference of the circuit of the liquid crystal display panel 29 is reduced, and the related electromagnetic emission cannot be identified even if the related electromagnetic emission leaks. Finally, the liquid crystal display screen 29 is assembled, and the liquid crystal display screen 29 is fixed through the buckles on the periphery of the display window. The liquid crystal display screen 29 increases readability, and meanwhile, a user can conveniently recognize the current machine state, for example, various alarm information such as no paper, paper jam and opening of a top cover can be prompted through the liquid crystal display screen 29, and meanwhile, the machine can give out alarm buzzing sound by alarming and flickering, so that the man-machine interaction feeling is enhanced.
As shown in fig. 6, the facsimile telephone set is composed of a telephone set main body 32, a telephone handle 33, and a telephone line. The telephone line is designed as a shielded cable. The customized omnibearing conductive foam 34 is arranged at the outgoing line position of the telephone host 32, the telephone host 32 is fixed on the shell 5 by a three-combination screw in a screwing way, the omnibearing conductive foam 34 is compressed while the screw is fixed, the electric continuity is met by the extrusion deformation of the omnibearing conductive foam 34, and the requirement of shielding efficiency is met.
For the shielding design of the telephone main unit, as shown in fig. 7, high-quality silver-copper conductive paint is uniformly sprayed inside the main unit housing 35 and the handle housing cover 36 of the telephone, and the two are fixed by the screw thread through the screw hole 24, so that an independent shielding cavity is ensured inside the telephone main unit 32. The headphone cable interface 37 is a dedicated interface with a shielding function, and a feed-through filter 38 is added to an input end of the headphone cable interface 37 to process an input signal and prevent an interference signal from being introduced.
As shown in fig. 8, the transmission mechanism 7 of the low-leakage facsimile machine drives the printing roller, the pressure roller, and the heating roller to rotate, thereby completing the operations of the input mechanism and the output mechanism. An air outlet hole is designed on the transmission mechanism bracket 39, and an air outlet fan 40 is installed, so that the heat inside the low-leakage fax machine can be timely dissipated, and the normal work of the low-leakage fax machine is ensured.
The grounding treatment is an important component of the electromagnetic compatibility design of the electronic equipment, and the good grounding treatment can effectively inhibit an external electromagnetic field and simultaneously protect equipment and personnel safety, so that the electromagnetic compatibility of the electronic equipment is improved, and the normal and reliable work of the electronic equipment is ensured. In order to prevent various circuits from interfering with each other during the operation of the facsimile machine and to enable the various circuits to operate compatibly with each other, the housing of the transmission motor and the support which plays a role in fixing in the equipment are grounded after being perfectly lapped, and the terminal of the AC power supply line is grounded.
The device may be connected to a channel encryption engine for encrypted communication. The cartridge 41 of the low-leakage facsimile machine employs a memoryless chip, and thus does not retain any trace of information. The special machine is special, hidden danger of secret divulgence caused by the multifunctional all-in-one machine is reduced, and daily management is facilitated. The paperless receiving function can be selected to be turned on or turned off in the menu according to needs, and hidden danger of disclosure is reduced.
The internal modular design of the fax machine host is that each module (the first shielding device, the second shielding device, the third shielding device and the like) is an independent component. As shown in fig. 9, each module is independently provided with a positioning boss 42, the modules are fixed to each other by the positioning bosses 42, and then the modules are locked and fixed to each other by three combined screws. The low-leakage fax machine is light, flexible, easy to disassemble and assemble and convenient to carry, and can meet the relevant requirements of vehicle-mounted vibration.
According to the low-leakage fax machine, the components are subjected to shielding treatment measures such as type selection, overlapping of the shell and the like, so that the low-leakage fax machine has excellent shielding efficiency in all wave bands, information leakage can be effectively prevented, and security of confidential information is guaranteed.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (10)
1. A low-leakage fax machine comprises a fax machine body, a first shielding device, a second shielding device and a third shielding device;
the first shielding device is used for shielding a power supply board of the fax machine main body;
the second shielding device is used for shielding the main control board of the fax machine main body;
the third shielding device is used for shielding the operating mechanism of the fax machine main body.
2. The low-leakage fax machine according to claim 1, wherein said first shielding means comprises a shielding tray and a first shielding cage;
the power supply board is arranged in a first shielding cavity formed by connecting the shielding tray and the first shielding cover;
aluminum foil conductive foam is arranged at the contact position between the shielding tray and the first shielding cover;
a plurality of openings are formed in the shielding tray, and the openings are used for enabling a plurality of groove-shaped photoelectric sensors of the power supply board to be positioned outside the shielding tray and the first shielding cover;
the shielding tray and the first shielding cover are made of cold-rolled steel plates;
the power line connected with the power supply board is a shielding cable;
and an EMI filter is arranged at the input end of the power interface of the fax machine body.
3. The low-leakage fax machine according to claim 2, wherein a plurality of cold air inlets are formed in the shielding tray, and a plurality of hot air outlets are formed in the first shielding cover;
the diameters of the cold air inlet and the hot air outlet are both 2.5mm;
the distance between two adjacent cold air inlets and the distance between two adjacent hot air outlets are both 5mm.
4. The low-leakage fax machine according to claim 1, wherein said second shielding means comprises: the main control board box body and the second shielding case;
the main control board is arranged in a second shielding cavity formed by connecting the main control board box body and the second shielding case;
aluminum foil conductive foam is arranged at the contact position between the main control board box body and the second shielding case;
the main control board box body and the second shielding case are made of aluminum materials.
5. The low-leakage fax machine according to claim 4, wherein said second shield shell is further provided with an annular securing block in which connector receptacles on said main control board are located;
after the power supply board and the main control board are assembled, a connector plug on the power supply board is connected with a connector socket on the main control board, and the annular fixing block is fastened with a first shielding cover in a first shielding device;
and the contact position between the annular fixed block and the second shielding case and the contact position between the annular fixed block and the first shielding case are both provided with aluminum foil conductive foam.
6. The low-leakage fax machine according to claim 4, wherein copper plating is provided around the micro switches on the main control board and around the external interface, and the copper plating overlaps with the second shield case; through holes are formed in the corresponding positions of the micro switch and the external interface on the second shielding cover.
7. The low-leakage fax machine according to claim 1, wherein said third shielding means comprises a third shielding cage and a metal conductive mesh film;
the operating mechanism comprises an operating control panel and an operating panel;
the operation control panel is fixed on the back of the operation panel, and the back of the operation panel is coated with silver-copper conductive paint;
the third shielding cover is bonded with the operation panel through aluminum conductive cloth; the third shielding cover is in contact with the back conductive paint of the operation panel;
the metal conductive net film is adhered to the display window of the operation panel through aluminum conductive cloth;
the operation panel and the function keys on the operation panel are made of ABS materials, and the back surfaces of the function keys are coated with silver-copper conductive paint.
8. The low-leakage fax machine according to claim 1, wherein the interior of the casing of the fax machine body, the main machine casing of the telephone and the handle casing cover are sprayed with silver-copper conductive paint;
the telephone line of the telephone is a shielding cable; the outgoing line position of the host of the telephone is provided with omnibearing conductive foam;
and a feed-through filter is arranged at the input end of the connecting wire interface of the telephone receiver of the telephone.
9. The low-leakage fax machine according to claim 8, wherein said main housing said handle case cover, said first shielding means, said second shielding means and said third shielding means are all grounded.
10. The low-leakage fax machine according to claim 1, wherein an air outlet is provided in a support of a transmission mechanism of the fax machine main body, and an air outlet fan is mounted in the air outlet.
Priority Applications (1)
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| CN216268259U (en) * | 2021-11-26 | 2022-04-12 | 东莞日精电子有限公司 | Printer touch screen operation panel |
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| JP2003274069A (en) * | 2002-03-15 | 2003-09-26 | Canon Inc | Image processing apparatus |
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