CN219427752U

CN219427752U - Thermal printing device capable of carrying charge detection resistor

Info

Publication number: CN219427752U
Application number: CN202320416727.2U
Authority: CN
Inventors: 周祥岗; 永野真一郎; 孙华刚; 孙玉萌
Original assignee: Shandong Hualing Electronics Co Ltd
Current assignee: Shandong Hualing Electronics Co Ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-07-28
Anticipated expiration: 2033-03-08

Abstract

The utility model relates to the technical field of manufacturing of thermal printheads, in particular to a thermal printing device capable of effectively overcoming the influence of surge or voltage drop, improving printing quality, overcoming the negative influence of a capacitor device on resistance measurement precision and efficiency and improving resistance measurement efficiency and precision and provided with a capacitor resistance, which is characterized in that an anti-surge circuit connected with a heating unit in a heating resistor body is arranged, the anti-surge circuit comprises a capacitor, a relay and a triode, the capacitor is connected with the heating unit in parallel, one end of the capacitor is connected with a printing power supply signal VH through the relay, and the other end of the capacitor is grounded through a socket; the projecting pole of triode links to each other with printing power supply signal VH through the socket, and the collecting electrode of triode links to each other with the control end positive pole of relay, and the base of triode links to each other with the VDD end through the socket, and the control end negative pole of relay is through socket ground connection, compares with prior art, has rational in infrastructure, survey and hinder the precision height, can effectively overcome surge or pressure drop influence, improves advantages such as print quality.

Description

Thermal printing device capable of carrying charge detection resistor

Technical field:

the utility model relates to the technical field of manufacturing of thermal printheads, in particular to a thermal printing device with a chargeable capacitance resistor, which can effectively overcome the influence of surge or voltage drop, improve printing quality, overcome the negative influence of a capacitance device on the resistor measuring precision and efficiency and improve the resistor measuring efficiency and precision.

The background technology is as follows:

as is well known, in the thermal printing principle, a color-forming layer on the surface of a thermal medium is heated and developed by heating a heating resistor, and the printing effect is significantly affected by the resistance change of the heating resistor, so that the resistance test of the heating resistor is one of important means for judging the state of a thermal printing head. In the printing process, each heating unit in the thermal printing head needs to be rapidly and frequently switched in power on and off, the service life and the printing quality of the printing head can be seriously affected by caused surges and voltage drops, the problem can be solved by utilizing the charge-discharge characteristics of the capacitor, but simultaneously, when the capacitor is connected with the heating unit in parallel, the influence of charge-discharge of the capacitor on the resistance measurement result is large in the resistance measurement process, and the resistance measurement difficulty of the thermal printing head is increased.

In order to solve the above problems, in the prior art, a capacitor is charged before resistance measurement, and resistance value is tested after the charging is completed. Patent document CN 105339176B proposes to provide a test voltage supply device for testing a current flowing through a heating resistor to determine the resistance value of the heating resistor when the voltage across the capacitor reaches the test voltage and stabilizes. Therefore, in order to solve the problem of resistance measurement with a capacitor, the influence on the resistance measurement circuit is reduced mainly after the capacitor is fully charged and stabilized, however, due to the fact that a certain time is required for charging and discharging the capacitor, the efficiency of resistance measurement is reduced, and meanwhile, the accuracy of resistance measurement is also reduced.

The utility model comprises the following steps:

aiming at the defects and shortcomings in the prior art, the utility model provides the thermosensitive printing device with the chargeable capacitance resistor, which can effectively overcome the influence of surge or voltage drop, improve the printing quality, overcome the negative influence of a capacitance device on the resistor measuring precision and efficiency and improve the resistor measuring efficiency and precision.

The utility model is achieved by the following measures:

the thermal printing device with the capacitance resistance comprises a ceramic substrate and a PCB (printed circuit board) which are arranged on a radiating plate, wherein a wire electrode, a heating resistor body and a control IC (integrated circuit) are arranged on the ceramic substrate, the control IC is respectively connected with the wire electrode on the ceramic substrate and a circuit on the PCB, and a socket for connecting a printing power supply signal is also arranged; the emitter of the triode is connected with the printing power supply signal VH through the socket, the collector of the triode is connected with the positive electrode of the control end of the switching device, the base of the triode is connected with the VDD end through the socket, and the negative electrode of the control end of the switching device is grounded through the socket.

The switching device of the present utility model may employ a relay.

The heating resistor body comprises more than two heating units, each heating unit is connected with a printing power supply signal VH and a GND end through a control IC and a socket, and an anti-surge circuit correspondingly connected with the heating units is arranged correspondingly.

The triode adopts the PNP triode and is used for being matched with a relay to realize the connection of the capacitor and the VH end of the printing power supply signal, so that the resistance measurement efficiency and the resistance measurement precision are prevented from being influenced in the resistance measurement process.

The heating resistor body on the ceramic substrate is electrically connected with the electrode wire, the electrode wire is connected with the control IC, and the control IC is covered with the packaging adhesive layer.

In the utility model, the voltage of the power supply signal VH is larger than the voltage of the VDD signal during printing, the voltage of the power supply signal VH is smaller than the voltage of the VDD signal during resistance measurement, and further, the voltage of the printing power supply signal VH is 24V and the voltage of the VDD signal is 5V during printing.

According to the utility model, the anti-surge circuit is arranged, the voltage difference between the printing power supply signal VH and the VDD signal is utilized to control the on-off of the triode, the triode is conducted during normal printing, the relay is closed, the capacitor is connected with the heating resistor in parallel, so that the charge and discharge can be realized, the anti-surge effect is realized, and the printing effect is improved; when the resistance is measured, the triode is disconnected, the relay cuts off the connection between the capacitor and the printing power supply signal VH end, the influence of the capacitor on a resistance measuring loop is avoided, and the resistance measuring precision is improved.

Compared with the prior art, the utility model has the advantages of reasonable structure, high resistance measurement precision, capability of effectively overcoming the influence of surge or pressure drop, printing quality improvement and the like.

Description of the drawings:

fig. 1 is a schematic diagram of the structure of the present utility model.

Fig. 2 is a schematic diagram of one implementation of an anti-surge circuit of the present utility model.

Reference numerals: the heat dissipation plate 1, the ceramic substrate 2, the heating resistor body 3, the PCB 4, the control IC5, the packaging adhesive layer 6, the socket 7, the capacitor 8, the triode 9 and the relay 10.

The specific embodiment is as follows:

the utility model will be further described with reference to the drawings and examples.

As shown in fig. 1, the utility model provides a thermal printing device with capacitance measuring resistor, which comprises a ceramic substrate 2 and a PCB circuit board 4 which are arranged on a heat dissipation plate 1, wherein a lead electrode, a heating resistor body and a control IC5 are arranged on the ceramic substrate 2, the control IC5 is respectively connected with the lead electrode on the ceramic substrate 2 and a circuit on the PCB circuit board 4, a socket 7 for connecting a printing power supply signal VH is also arranged, an anti-surge circuit connected with a heating unit in the heating resistor body is also arranged, the anti-surge circuit comprises a capacitor 8, a switching device (a relay 10) and a triode 9, the capacitor is connected with the heating unit in parallel, one end of the capacitor is connected with the printing power supply signal VH through the relay 10, and the other end of the capacitor is grounded through the socket 7; the emitter of the triode 9 is connected with the printing power supply signal VH through the socket 7, the collector of the triode 9 is connected with the positive electrode of the control end of the switching device (relay 10), the base of the triode 9 is connected with the VDD end through the socket 7, and the negative electrode of the control end of the switching device (relay 10) is grounded through the socket 7.

The heating resistor body comprises more than two heating units, each heating unit is connected with a printing power supply signal VH and a GND end through a control IC5 and a socket 7, and an anti-surge circuit correspondingly connected with the heating unit is arranged correspondingly.

The triode 9 adopts a PNP triode and is used for being matched with the relay 10 to realize the connection between the capacitor and the VH end of the printing power supply signal, so that the resistance measurement efficiency and the resistance measurement precision are prevented from being influenced in the resistance measurement process.

The heating resistor body on the ceramic substrate 2 is electrically connected with the electrode wire, the electrode wire is connected with the control IC5, and the control IC5 is covered with the packaging adhesive layer 6.

Example 1:

as shown in fig. 1, this example provides a thermal printing device capable of carrying out capacitance resistance measurement, which is provided with a heat dissipation plate 1, wherein a ceramic substrate 2 and a PCB circuit board 4 are arranged on the heat dissipation plate 1, an anti-surge circuit composed of a socket 7, a capacitor 8, a PNP triode 9 and a relay 10 is arranged on the PCB circuit board 4, wherein a control IC5 is electrically connected with an electrode wire on the ceramic substrate 2 and an electrode on the PCB circuit board 4, and a layer of packaging adhesive layer 6 is covered on the control IC5 for protection;

in this example, as shown in fig. 2, one end of a capacitor (C) 8 is electrically connected with a VH signal on a socket 7 through a relay (KA) 10, the other end of the capacitor (C) 8 is electrically connected with a GND signal on the socket 7, an emitter of a triode (Q) 9 is electrically connected with the VH signal on the socket 7, a base of the triode (Q) 9 is electrically connected with a VDD signal on the socket 7, a collector of the triode (Q) 9 is electrically connected with a positive electrode of a control end of the relay 10, and a negative electrode of the control end of the relay 10 is electrically connected with the GND signal on the socket 7. The resistor R in fig. 2 represents each individual heat generating unit of the heat generating body 3, and is electrically connected to VH and GND signals on the socket through the control IC 5. VH is the power supply voltage of the thermal head, and VDD is the power supply voltage of the control IC 5.

When printing, the VH voltage is higher than the VDD voltage, in this example, VH 24v and VDD 5v are taken as examples, at this time, PNP triode 9 is turned on, and the control end of relay 10 is triggered by energization, so that one end of capacitor 8 is turned on with VH signal, and capacitor 8 and the heating resistor are connected in parallel in the circuit. The heating point needs to be powered on and off at high speed and frequently in the printing process, and voltage surge and voltage drop are generated; when the voltage suddenly rises, part of the charge can be absorbed by the charging characteristics of the capacitor 8; when the voltage drops, the heat generating resistor is supplied with power by the discharge characteristic of the capacitor 8. The voltage at the two ends of the heating resistor body R tends to be stable, and the printing effect is improved;

when the resistance is measured, the voltage VH is smaller than or equal to the voltage VDD, at the moment, the triode 9 is in a cut-off state, the control end of the relay 10 has no trigger signal, the relay cuts off the connection between the capacitor and the VH, the resistance measuring loop is not influenced by the capacitor 8 any more, and the accuracy of resistance measurement is improved.

Claims

1. The thermal printing device with the capacitance resistance comprises a ceramic substrate and a PCB (printed circuit board) which are arranged on a radiating plate, wherein a wire electrode, a heating resistor body and a control IC (integrated circuit) are arranged on the ceramic substrate, the control IC is respectively connected with the wire electrode on the ceramic substrate and a circuit on the PCB, and a socket for connecting a printing power supply signal is also arranged; the emitter of the triode is connected with the printing power supply signal VH through the socket, the collector of the triode is connected with the positive electrode of the control end of the switching device, the base of the triode is connected with the VDD end through the socket, and the negative electrode of the control end of the switching device is grounded through the socket.

2. The thermal printing device with capacitance measuring resistor according to claim 1, wherein the heating resistor body is composed of more than two heating units, each heating unit is connected with the printing power supply signal VH and GND terminal through a control IC and a socket, and an anti-surge circuit correspondingly connected with the heating unit is provided correspondingly.

3. The thermal printing device with capacitive sensing resistor of claim 1, wherein the transistor is a PNP transistor.

4. The thermal printing device with capacitance sensing resistor as claimed in claim 1, wherein the heating resistor on the ceramic substrate is electrically connected with an electrode wire, the electrode wire is connected with a control IC, and the control IC is covered with a packaging adhesive layer.

5. The thermal printing device with capacitive sensing resistor of claim 1, wherein the voltage of the power supply signal VH during printing is greater than the voltage of the VDD signal, and the voltage of the power supply signal VH during resistor sensing is less than the voltage of the VDD signal.