CN202495989U - Facsimile apparatus - Google Patents

Abstract

The utility model relates to a facsimile machine, it includes: the fax machine comprises a fax machine main body, a first connecting interface and an electrostatic discharge protection unit. The fax machine can be connected to the central office through the first connection interface and the first telephone line. The fax machine main body is used for responding to fax requirements and executing fax operation. The electrostatic discharge protection unit is coupled between the fax machine main body and the first connection interface and used for discharging an electrostatic discharge current corresponding to an electrostatic discharge event when the electrostatic discharge event occurs, so that the fax machine main body is protected from being damaged due to the influence of the electrostatic discharge event.

Description

fax machine

technical field

The utility model relates to a communication device, in particular to a communication device capable of transmitting still images.

Background technique

Fax is a means of communication that transmits text, charts, images, etc. recorded on paper from the sending end by scanning, and reproduces them on the recording paper at the receiving end. In other words, facsimile communication is actually a "recorded communication" that transmits still images, and some people call it "remote copying". Also because of this, the facsimile machine (fax machine) with multiple advantages such as convenience, quickness, accuracy and low communication cost has become one of the requisite communication equipments of major enterprises and institutions or families. However, when some electrostatic discharge event (ESD event) occurs, such as an instantaneous lightning strike with a large electrostatic discharge energy (ESD energy), the internal circuit of the fax machine may suffer from the flow of electrostatic discharge current and be damaged. Damaged, resulting in the loss of the original function of the fax machine.

Utility model content

In view of this, the utility model provides a facsimile machine, which can solve the problems mentioned in the prior art.

The utility model provides a facsimile machine, which comprises a facsimile machine main body, a first connection interface, and an electrostatic discharge protection unit. Wherein, the facsimile machine can be connected to the central office through the first connection interface and the first telephone line. The main body of the facsimile machine is used to respond to the facsimile demand and execute the facsimile operation. The electrostatic discharge protection unit is coupled between the main body of the fax machine and the first connection interface, and is used for discharging the electrostatic discharge current corresponding to the electrostatic discharge event when an electrostatic discharge event occurs, so as to protect the main body of the fax machine from being subjected to the electrostatic discharge event damaged by the influence.

In an embodiment of the present invention, the mentioned facsimile machine may further include a second connection interface, and the facsimile machine may be connected to a local telephone through the second connection interface and the second telephone line.

In an embodiment of the present invention, both the first connection interface and the second connection interface can be RJ-45 connection interfaces. Based on this, the first telephone line includes a tip and a ring, and the first connection interface includes a first connection end and a second connection end. Wherein, the first connection end corresponds to the terminal line of the first telephone line, and the second connection end corresponds to the ring line of the first telephone line.

In an embodiment of the present invention, the ESD protection unit includes a first diode and a second diode. Wherein, the cathode of the first diode is coupled to the first connection point of the first connection interface, and the anode of the first diode is coupled to the ground potential. The cathode of the second diode is coupled to the second connection point of the first connection interface, and the anode of the second diode is coupled to the ground potential.

In an embodiment of the present invention, both the first diode and the second diode can be transient voltage suppression diodes (TVS diodes).

In an embodiment of the present invention, the electrostatic discharge protection unit may further include a first overcurrent protection element and a second overcurrent protection element. Wherein, the first overcurrent protection element is coupled between the cathode of the first diode and the first connection point of the first connection interface. The second overcurrent protection element is coupled between the cathode of the second diode and the second connection point of the first connection interface.

In an embodiment of the present invention, both the first overcurrent protection element and the second overcurrent protection element have self-restorable capability.

In an embodiment of the present invention, the main body of the facsimile machine may include a data input and output configuration element, a data chip, a switching unit, and a control core. Among them, the data input and output configuration element is used as an isolation and conversion interface between the fax machine and the central office. The data chip is coupled to the data input/output configuration element and is used as the data processing core of the fax machine. The switching unit is used for determining to connect the central office to the main body of the facsimile machine or the local telephone in response to a switching signal. The control core is coupled to the switching unit, and is used for sending the switching signal to the switching unit when the remote phone dials to the local phone, so as to connect the central office to the local phone.

In an embodiment of the present utility model, the control core can also be coupled to the data chip for sending the switching signal to the switching unit when the fax data from the remote phone is sent to the local phone, so as to connect the local end to the main body of the fax machine .

In an embodiment of the present invention, the main body of the facsimile machine may further include a printing unit, a transmission mechanism, and a storage unit. The printing unit, the transmission mechanism and the storage unit are respectively coupled to the control core, and the control core cooperatively controls the printing unit, the transmission mechanism and the storage unit to print the data faxed by the remote phone.

In an embodiment of the present invention, the main body of the facsimile machine may further include a man-machine interface and a scanning unit. Wherein, the man-machine interface and the scanning unit are respectively coupled to the control core, and the control core responds to the input of the man-machine interface to cooperatively control the scanning unit, the transmission mechanism and the storage unit, so as to execute the scanning of the data to be faxed by the local telephone.

Based on the above, the utility model adds an electrostatic discharge protection unit inside the facsimile machine between the connection interface (RJ-45) of the access office end and the main body of the facsimile machine, so as to release the possible leakage from the connection interface of the access office end. Electrostatic discharge current, so as to avoid the facsimile machine being damaged by certain electrostatic discharge events (ESD events) (such as lightning strikes with relatively large electrostatic discharge energy).

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with accompanying drawings.

Description of drawings

The accompanying drawings below are a part of the specification of the present utility model, showing exemplary embodiments of the present utility model, and together with the description of the specification, the accompanying drawings illustrate the principle of the present utility model.

FIG. 1 is a schematic diagram of a facsimile system according to an embodiment of the present invention.

FIG. 2 shows a block diagram of the facsimile machine of FIG. 1 .

FIG. 3 is a schematic diagram of the ESD protection unit in FIG. 2 .

FIG. 4 is a schematic diagram of a layout of diodes associated with an ESD protection unit according to an embodiment of the present invention.

Description of main component symbols:

10: Fax system

101: Fax machine

103: Local call

105: Remote phone call

107: Central office (public switched telephone network)

201: Fax machine main body

203: Electrostatic discharge protection unit

205: Data entry and exit configuration element

207: Data chip

209: Switch unit

211: control core

213: Man-machine interface

215: scanning unit

217: printing unit

219: transmission mechanism

221: storage unit

F1, F2: connection interface

T1, T2, R1, R2: connection terminals

L 1, L2: telephone line

TL1, TL2: terminal line

RL 1, RL2: Loop

P1, P2: overcurrent protection components

D1: D2: diode

SS: switching signal

Detailed ways

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements/components using the same reference numerals in the drawings and embodiments represent the same or similar parts.

Fig. 1 shows the schematic diagram of the facsimile system (fax system) 10 of an embodiment of the present utility model; Fig. 2 shows the block diagram of the facsimile machine 101 of Fig. 1; And Fig. 3 shows the schematic diagram of the electrostatic discharge protection unit 203 of Fig. 2 . Please refer to FIG. 1 to FIG. 3 together. From the perspective of the structure of the facsimile system 10, it can be roughly divided into a local end, a remote end, and a central office end. Wherein, the local end includes a fax machine (fax machine) 101 and a local telephone (local telephone) 103; the far end includes a far-end telephone (far-end telephone) 105 with a fax function; and the central office is, for example, a public switched telephone network ( public switched telephone network, PSTN) 107, but not limited thereto.

In addition, the fax machine 101 may include a fax-machine body 201 , connection interfaces F1 and F2 , and an ESD protection unit 203 . Wherein, the facsimile machine main body 201 is used to respond to the facsimile demand and execute the facsimile operation, and it includes a data access arrangement (data access arrangement, DAA) component 205, a data chip (modem chip) 207, a switching unit (switching unit) 209, a control Core (control core) 211, man-machine-interface (man-machine-interface, MMI) 213, scanning unit (scanning unit) 215, printing unit (print unit) 217, transmission mechanism (transmission mechanism) 219, and storage unit (memory unit) 221.

In this embodiment, the facsimile machine 101 can be connected to a telephone line L1 (which has a terminal line (tip) TL1 and a ring line (ring) RL1) through a connection interface F1 (such as an RJ-45 connection interface, but not limited thereto) and connected to the central office (that is, the public switched telephone network (PSTN) 107); in addition, the facsimile machine 101 can also be connected to the telephone line L2 ( It also has a tip TL2 and a ring RL2) to connect to the local telephone 103.

The electrostatic discharge protection unit 203 is coupled between the main body 201 of the facsimile machine and the connection interface F1, and is used for discharging the electricity corresponding to the electrostatic discharge event (lightning strike) when an electrostatic discharge event (such as a lightning strike, but not limited thereto) occurs. The electrostatic discharge current (ESD current) is used to protect the facsimile machine main body 201 from being damaged by the electrostatic discharge event (lightning strike).

In this embodiment, the connection interface F1 may include a connection terminal T1 corresponding to the terminal line TL1 of the telephone line L1, and a connection terminal R1 corresponding to the ring line RL1 of the telephone line L1. Similarly, the connection interface F2 may also include a connection terminal T2 corresponding to the terminal line TL2 of the telephone line L2, and a connection terminal R2 corresponding to the ring line RL2 of the telephone line L2.

Based on this, the ESD protection unit 203 may include diodes D1 and D2 and over-current protection elements P1 and P2. Wherein, the cathode of the diode D1 is coupled to the connection terminal T1 of the connection interface F1 through the overcurrent protection element P1, and the anode of the diode D1 is coupled to the ground potential GND. In addition, the cathode of the diode D2 is coupled to the connection terminal R1 of the connection interface F1 through the overcurrent protection element P2, and the anode of the diode D2 is coupled to the ground potential GND. In other words, the overcurrent protection element P1 is coupled between the cathode of the diode D1 and the connection terminal T1 of the connection interface F1; and the overcurrent protection element P2 is coupled between the cathode of the diode D2 and the connection terminal R1 of the connection interface F1.

In this embodiment, both the diodes D1 and D2 can be transient voltage suppression diodes (TVS diodes), but are not limited thereto. In addition, both the overcurrent protection elements P1 and P2 can have self-restorable capabilities, for example, they can be self-restorable elements (self-restorable) based on conductive polymer (positive temperature coefficient (PTC)) thermistors. -restorable polyswitch).

On the other hand, the Data Access Arrangement (DAA) component 205 is used as an isolation and conversion interface between the facsimile machine 101 and the central office (ie, the Public Switched Telephone Network (PSTN) 107 ). In fact, the Federal Communications Commission (FCC) of the United States requires 1500 volts (V) isolation between the fax machine 101 and the central office (i.e., the public switched telephone network (PSTN) 107) to protect the central office (i.e., the public switched telephone network) (PSTN) 107) from being damaged by malfunctioning or abnormal facsimile machine 101. In addition, the Data Access Arrangement (DAA) component 205 can also convert (for example, convert between digital and analog signals) the signal transmitted by the remote telephone 105 through the central office (i.e., the public switched telephone network (PSTN) 107), or Convert the signal that the local end wants to fax to the remote end (such as the conversion between digital and analog signals).

The data chip 207 is coupled to the data access arrangement (DAA) component 205 and used as a data processing core (data processing core) of the facsimile machine 101 . The switching unit 209 responds to a switching signal S S from the control core 211 to determine to connect the central office (that is, the public switched telephone network (PSTN) 107) to the fax machine main body 201 or the local telephone 103.

More clearly, the control core 211 is coupled to the switch unit 209, and is used for sending a switch signal S S to the switch unit 209 when the remote phone 105 dials (dial) to the local phone 103, so as to switch the central office (i.e. A public switched telephone network (PSTN) 107) is connected to the local telephone 103. In this way, the local phone 103 and the remote phone 105 can communicate through the central office (that is, the public switched telephone network (PSTN) 107 ).

In addition, the control core 211 can also be coupled to the data chip 207, and is used for sending a switching signal SS to the switching unit 209 when the remote phone 105 faxes data to the local phone 103, so as to switch the central office (that is, the public switched telephone network (PST) PSTN) 107) is connected to the main body 201 of the facsimile machine. In this way, the remote phone 105 can fax data to the fax machine 101 through the central office (that is, the public switched telephone network (PSTN) 107 ).

Furthermore, the man-machine interface 213 , the scanning unit 215 , the printing unit 217 , the transmission mechanism 219 and the storage unit 221 can be respectively coupled to the control core 211 . When the facsimile machine 101 intends to print out the data faxed by the remote phone 105, the control core 211 will first send a switching signal SS to connect the local end (that is, the public switched telephone network (PSTN) 107) to the facsimile machine main body 201, and then Then coordinately control the printing unit 217, the transmission mechanism 219 and the storage unit 221, so as to perform the printing of the data faxed by the remote phone 105 (that is, after being converted by the data input and output configuration (DAA) interface 205 and transmitted to the control through the data chip 207 Core 211 data is printed out).

Conversely, when the local telephone 103 wants to fax data to the remote telephone 105, the control core 211 will send a switching signal SS to connect the central office (that is, the public switched telephone network (PSTN) 107) to the fax machine main body 201, and then The scanning unit 215 , the transmission mechanism 219 and the storage unit 221 are coordinated to control the scanning unit 215 , the transmission mechanism 219 and the storage unit 221 in response to the input of the man-machine interface 213 (that is, the user's operation on the facsimile machine 101 ), so as to scan the data to be faxed by the local telephone 103 . Afterwards, the control core 211 will transmit the scanned data to the data chip 207 to be converted by the data input and output configuration (DAA) component 205, and then transmitted to the remote end through the central office (that is, the public switched telephone network (PSTN) 107) Call 105.

Here, it can be seen from the content described in the prior art that when some electrostatic discharge events (ESDevent) occur, such as an instantaneous lightning strike with relatively large electrostatic discharge energy (ESD energy), the internal circuits of the facsimile machine may be damaged. It is damaged by the flow of electrostatic discharge current, which leads to the loss of the original function of the fax machine.

In view of this, the present embodiment particularly utilizes the ESD protection unit 203 so that when an ESD event (lightning strike, but not limited thereto) occurs, the (transient voltage suppression, TVS) diodes D1 and D2 may discharge from the The electrostatic discharge current that enters into the connection interface F1 of the local terminal 107 is connected. In this way, the problem of damage to the facsimile machine 101 caused by electrostatic discharge events (lightning strikes) can be avoided.

On the other hand, in order to further protect (Transient Voltage Suppression, TVS) diodes D1 and D2 from being destroyed by a considerable ESD energy. In this embodiment, especially between the connection terminal T1 of the connection interface F1 and the cathode of the diode D1, and between the connection terminal R1 of the connection interface F1 and the cathode of the diode D2, a self-restorable function) overcurrent protection elements P1, P2. In this way, if the electrostatic discharge energy caused by an instantaneous lightning strike or other factors is too large, the overcurrent protection elements P1 and P2 will be in an open state, thereby protecting the diodes D1 and D2 from being damaged, thereby blocking the electrostatic discharge current from escaping. Enter the facsimile machine main body 201. Moreover, since the overcurrent protection elements P1 and P2 have a self-resetting function, they will return from the open circuit state to the short circuit state after a period of time, so as to restore the original function of the electrostatic discharge protection unit 203, that is, discharge is possible The electrostatic discharge current that enters from the connection interface F1 of the access terminal 107 .

Furthermore, when the electrostatic discharge protection unit 203 is actually applied to the facsimile machine 101, certain preset design conditions must be established, but not absolute, for example:

1. When the electrostatic discharge protection unit 203 is laid out on the hard brush circuit board (PCB), the angles at which the diodes D1 and D2 are placed on the surface of the layout element must be 45° relative to the X axis (as shown in Figure 4 shown), instead of the traditional 90° or 180°;

2. The cathodes of the diodes D1 and D2 are respectively connected to the connection terminals T1 and R1 of the connection interface F1, and the length of the layout trace (layout trace) must be less than 13mm;

3. The line width of the ground trace connected to the anodes of diodes D1 and D2 must be greater than 6mm; and

4. The overcurrent protection element P1 must be arranged between the cathode of the diode D1 and the connection terminal T1 of the connection interface F1, and the overcurrent protection element P2 must be arranged between the cathode of the diode D2 and the connection terminal R1 of the connection interface F1.

In summary, the utility model adds an electrostatic discharge protection unit inside the facsimile machine between the connection interface (RJ-45) of the access office end and the main body of the facsimile machine, so as to release the possible discharge from the connection interface of the access office end. The intruded electrostatic discharge current avoids the problem that the facsimile machine is damaged due to the occurrence of certain electrostatic discharge events (ESD events) (such as lightning strikes with relatively large electrostatic discharge energy).

Although the utility model has been disclosed above with the embodiment, it is not intended to limit the creation. Any person skilled in the art can make appropriate changes and equivalent replacements without departing from the spirit and scope of the creation. Therefore, this The protection scope of the utility model shall be defined by the claims of the present application. In addition, any embodiment of the utility model or the application claims do not need to achieve all the purposes or advantages or features disclosed in the utility model. In addition, the abstract part and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present utility model.

Claims (12)

1. A facsimile machine, characterized in that, comprising: A facsimile machine main body, used to respond to a facsimile demand and execute a facsimile operation; a first connection interface, wherein the facsimile machine is connected to a central office through the first connection interface and a first telephone line; and An electrostatic discharge protection unit, coupled between the main body of the facsimile machine and the first connection interface, is used to discharge an electrostatic discharge current corresponding to the electrostatic discharge event when an electrostatic discharge event occurs, so as to protect the fax machine The body of the machine is protected from being damaged by the electrostatic discharge event. 2. The facsimile machine according to claim 1, further comprising: A second connection interface, wherein the facsimile machine is connected to a local telephone through the second connection interface and a second telephone line. 3. The facsimile machine according to claim 2, wherein both the first connection interface and the second connection interface are RJ-45 connection interfaces. 4. The facsimile machine according to claim 3, wherein the first telephone line comprises a terminal line and a ring line, and the first connection interface comprises: a first connection terminal corresponding to the terminal line; and A second connection end, which corresponds to the loop line. 5. The facsimile machine according to claim 4, wherein the electrostatic discharge protection unit comprises: a first diode, the cathode of which is coupled to the first connection point and the anode of which is coupled to a ground potential; and A second diode, the cathode of which is coupled to the second connection point, and the anode of which is coupled to the ground potential. 6. The facsimile machine according to claim 5, wherein both the first diode and the second diode are transient voltage suppression diodes. 7. The facsimile machine according to claim 5, wherein the electrostatic discharge protection unit further comprises: a first overcurrent protection element coupled between the cathode of the first diode and the first connection point; and A second overcurrent protection element is coupled between the cathode of the second diode and the second connection point. 8 . The facsimile machine according to claim 7 , wherein both the first overcurrent protection element and the second overcurrent protection element have self-resetting capability. 9. The facsimile machine according to claim 2, wherein the main body of the facsimile machine comprises: A data input and output configuration element, used as an isolation and conversion interface between the facsimile machine and the central office; A data chip, coupled to the data input and output configuration element, is used as a data processing core of the facsimile machine; a switching unit, used to determine to connect the central office to the facsimile main body or the local telephone in response to a switching signal; and A control core, coupled to the switching unit, is used to send the switching signal to the switching unit when a remote phone dials to the local phone, so as to connect the central office to the local phone. 10. The facsimile machine according to claim 9, wherein the control core is further coupled to the data chip for sending the switching signal to the switching unit when the remote phone faxes data to the local phone , so as to connect the central office to the main body of the facsimile machine. 11. The facsimile machine according to claim 10, wherein the facsimile machine body further comprises: a printing unit; a transmission mechanism; and a storage unit, Wherein, the printing unit, the transmission mechanism and the storage unit are respectively coupled to the control core, and the control core cooperatively controls the printing unit, the transmission mechanism and the storage unit to execute the data faxed by the remote phone. Print. 12. The facsimile machine according to claim 11, wherein the facsimile machine body further comprises: a man-machine interface; and a scanning unit, Wherein, the man-machine interface and the scanning unit are respectively coupled to the control core, and the control core responds to the input of the man-machine interface to cooperatively control the scanning unit, the transmission mechanism and the storage unit, so as to execute the local Scanning of the data to be faxed by the phone.

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