CN102508417A - Laser printer and modification method thereof - Google Patents

Laser printer and modification method thereof Download PDF

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Publication number
CN102508417A
CN102508417A CN201110364123XA CN201110364123A CN102508417A CN 102508417 A CN102508417 A CN 102508417A CN 201110364123X A CN201110364123X A CN 201110364123XA CN 201110364123 A CN201110364123 A CN 201110364123A CN 102508417 A CN102508417 A CN 102508417A
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CN
China
Prior art keywords
laser printer
electric contact
rectification module
electrically connected
contact
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CN201110364123XA
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Chinese (zh)
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CN102508417B (en
Inventor
苏健强
汪继忠
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Print Rite Unicorn Image Products Co Ltd
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Print Rite Unicorn Image Products Co Ltd
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Priority to CN201110364123.XA priority Critical patent/CN102508417B/en
Publication of CN102508417A publication Critical patent/CN102508417A/en
Priority to PCT/CN2012/084534 priority patent/WO2013071853A1/en
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Publication of CN102508417B publication Critical patent/CN102508417B/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/80—Details relating to power supplies, circuits boards, electrical connections
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1642—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements for connecting the different parts of the apparatus
    • G03G21/1652—Electrical connection means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
    • G03G21/1676—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the developer unit

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

The invention provides a laser printer and a modification method thereof. The laser printer is provided with a casing, a cavity is surrounded by the casing, an electric contact used for inputting development bias voltage is arranged on the inner surface of the cavity, a circuit board is mounted in the casing, a power supply circuit is arranged on the circuit board, and a power supply module is used for outputting development bias voltage to the electric contact, wherein the power supply circuit is further provided with a rectification module, which receives electric signals output by the power supply module and is provided with an output end electrically connected with the electric contact. The method for modifying the existing laser printer to the printer with the structure includes steps as follows: the electrical connection between the output end of the power supply circuit and the electric contact is cut off, the rectification module which receives the electric signals output by the power supply module is arranged on the power supply circuit, and the output end of the rectification module is electrically connected with the electric contact. The laser printer provided by the invention can meet the contact existing work requirements, the printing cost is lowered, and the laser printer is convenient for a user to modify and use at the user's discretion.

Description

Laser printer and method of modifying thereof
Technical field
The present invention relates to the electronic imaging device field, the method that especially relates to a kind of laser printer and existing laser printer repacked into this laser printer.
Background technology
Laser printer is a kind of common printer, for modern office provides great convenience.Referring to Fig. 1 and Fig. 2, existing laser printer has housing 10, and housing 10 comprises loam cake 11 and end cap 12, and housing 10 surrounds a cavity 13, and the inside surface of cavity 13 is provided with electric contact (invisible among Fig. 2).There are the circuit board 14 of laser printer, circuit board 14 to be provided with control circuit, feed circuit of laser printer etc. in the installed inside of end cap 12.And, handle box removably is installed in the cavity 13, the structural drawing of handle box is as shown in Figure 3.
Existing handle box 20 has a housing 21, and housing 21 is provided with a handle 22, and person easy to use holds.Referring to Fig. 4, the housing 21 of handle box 20 is made up of drum frame 23, carbon dust chamber framework 24 and two end caps 25,26, and wherein handle 22 is positioned on the drum frame 23.Carbon dust chamber framework 24 has a carbon dust chamber that is used to hold carbon dust, outside the carbon dust chamber, is provided with powder feeding roller 31, developer roll 32, powder delivery cutter 41.
Drum frame 23 has a useless powder chamber, is used to hold waste and old carbon dust, and useless powder chamber peripheral hardware has photosensitive drums 42, charging roller 43 and cleaning doctor 44.During the handle box assembling; Drum frame 23 is connected fixing with carbon dust chamber framework 24 through end covers at two sides 25,26; And drum frame 23, carbon dust chamber framework 24 and end cap 25,26 surround a cavity, and parts such as powder feeding roller 31, developer roll 32, powder delivery cutter 41, photosensitive drums 42, charging roller 43 and cleaning doctor 44 are positioned at this cavity.
Developer roll 32 has a metal mandrel 33, and mandrel 33 is wrapped with elastic layer 34, and like sponge, rubber etc., an end of mandrel 33 is connected with conducting strip 35, and conducting strip 35 outer ends extend to outside the end cap 26.Electric contact in conducting strip 35 and the laser printer cavity contact, thus being electrically connected of realization conducting strip 35 and electric contact.And, the voltage that conducting strip 35 receives from the supply of laser printer, this voltage is called the development bias voltage.During handle box 20 work, the outside surface of developer roll 32 and carbon dust are adsorbed on carbon dust on developer roll 32 outside surfaces through electrostatic interaction.
The carbon dust of developer roll 32 outside surfaces is transferred to the outside surface of photosensitive drums 42 through electric field force.During laser printer work, the carbon dust that is contained in the carbon dust chamber supplies to developer roll 32 outside surfaces through powder feeding roller 31, constantly rotates during powder feeding roller 31 work.
The abut outer surfaces of powder feeding roller 31 and developer roll 32, the carbon dust that therefore in powder feeding roller 31 rotary courses, will be adsorbed on outside surface is transferred to the outside surface of developer roll 32, also constantly rotation during developer roll 32 work.In developer roll 32 rotary courses, the unnecessary carbon dust of its outside surface will pass through striking off of powder delivery cutter 41, make developer roll 32 outside surface carbon dust layer thicknesses even.
And charging roller 43 makes photosensitive drums 42 outside surfaces electronegative equably to photosensitive drums 42 chargings.In laser printer when work,, laser instrument has the laser of image information to photosensitive drums 42 surface irradiations, and this process is an exposure process, forms latent images in irradiated zone, photosensitive drums 42 surfaces, and promptly the exposure area electric charge disappears, and is electric neutrality.
Because unexposed area is electronegative on the photosensitive drums 42; And the exposure area is an electric neutrality; And the carbon dust of developer roll 32 outside surfaces is also electronegative, according to electric charge in electric field principle, the carbon dust of developer roll 32 outside surfaces; To under the effect of electric field force, move to exposure area on the photosensitive drums 42 by developer roll 32 outside surfaces.And because the development bias voltage that the electric field force in territory, non-exposed area is higher than, so the carbon dust of developer roll 32 outside surfaces can not move to the territory, non-exposed area of photosensitive drums 42 outside surfaces, and this process is a developing process.
At last, from photosensitive drums 42 below processes, carbon dust will be transferred on the paper as the paper of print media, and on paper, accomplish by print job through heating back photographic fixing for carbon dust.
After photosensitive drums 42 is accomplished transfer process, cleaning doctor 44 will strike off the carbon dust that remains in photosensitive drums 42 outside surfaces, and useless pruinescence is collected and got into useless powder chamber, avoids influencing next print job cycle of photosensitive drums.
Existing laser printer is divided by its visualization way, can be divided into contact and develop and contactless development, and wherein contactless development also is called as great-jump-forward and develops, and the surface of developer roll 32 does not contact with the surface of photosensitive drums 42, but certain distance is arranged.The development bias voltage that using the laser printer of this visualization way provides to developer roll 32 is the alternating current that has DC component.
Referring to Fig. 5; The laser printer feed circuit of contactless development have power module; Comprise an alternating current source AC, and be provided with capacitor C 1, diode D1 and resistance R 1, R2, R3, wherein alternating current source AC one end is connected to the output terminal 48 of power module through resistance R 3; The output terminal 48 of power module also is the output terminal of feed circuit, is used for the electric contact output development bias voltage in cavity 13.
The anode of diode D1 is connected to output terminal 48 through resistance R 3, and negative electrode is through resistance R 2 ground connection.It is thus clear that the AC signal of alternating current source AC output can be directly through output terminal 48 outputs, and B point place AC signal is when being positive half cycle, and electric current can't be through diode D1 output, and when A point place AC signal is negative half period, electric current will export output terminal 48 to through diode D1.Therefore, the development bias voltage of output terminal 48 outputs includes AC compounent and DC component.
Under contactless development mode of operation; The development bias voltage that receives because of developer roll 32 has AC compounent; Therefore the electric field force direction that forms constantly changes; Carbon dust is being beated between developer roll 32 and photosensitive drums 42 surfaces under the effect of magnetic field force, and just carbon dust is to jump on the surface of photosensitive drums 42 under the effect of magnetic field force.Therefore, the carbon dust amount that this visualization way often consumes is bigger, and it is higher to print cost.
Under contact development mode of operation, the surface of the surface of developer roll 32 and photosensitive drums 42, the development bias voltage of laser printer conductive sheet 35 outputs only comprises DC component, and this DC component is to be lower than 0 volt voltage.Like this, carbon dust can not beated between developer roll 32 and photosensitive drums 42, so carbon dust directly is transferred to the surface of photosensitive drums 42 under the effect of electric field force, and the carbon dust amount that this visualization way consumes is less, and it is lower to print cost.
But because existing laser printer can only provide a kind of visualization way to the user, if laser printer is contactless development, the user can only use the handle box of contactless development, causes the printing cost high.Therefore; Notification number is that the Chinese utility model patent of CN201402372Y discloses the innovation and creation of a kind of " handle box " by name; Be provided with rectifier between the developer roll of this handle box and the conducting strip, the development bias voltage rectification that will have AC compounent forms and only comprises the voltage of DC component and provide developer roll to use.Like this, can the handle box that contact is developed be installed on the non-contact laser printer, save and print cost.
Yet, on each handle box, rectifier is installed, increase the production cost of handle box, it is higher still can to cause printing cost.And, if the user reequips handle box voluntarily, repack common handle box into this handle box, then when changing handle box, reequip operation at every turn, consume lot of manpower and material resources, be unfavorable for user's use.
Summary of the invention
Fundamental purpose of the present invention provides a kind of laser printer that can effectively reduce the printing cost and be user-friendly to.
Another object of the present invention provides and a kind ofly will have the method that the non-contact laser printer repacks the contact laser printer into now.
For realizing above-mentioned fundamental purpose, laser printer provided by the invention comprises housing, and housing surrounds cavity; The inside surface of cavity is provided with the electric contact that is used to export the development bias voltage, and circuit board is installed in the housing, and circuit board is provided with feed circuit; Feed circuit are provided with power module, and power module is used for to electric contact output development bias voltage, wherein; Feed circuit also are provided with rectification module, and rectification module receives the electric signal of power module output, and the output terminal of rectification module is electrically connected with electric contact.
Visible by such scheme, be provided with rectification module in the feed circuit of laser printer, can the electrical signal conversion that contain AC compounent be become only to comprise the electric signal of DC component; And export electric contact to as the development bias voltage; Like this, even rectifier is not set in the handle box, also can be installed in the laser printer and normal the use; And, can effectively reduce the printing cost with the work of contact visualization way.In addition, because handle box need not to be provided with rectifier, so commonly on the market be used for handle box that contact develops and also can be installed on the laser printer of the present invention and use, the user need not handle box is reequiped, and is easy to use.
A preferred scheme is; Feed circuit also are provided with double throw switch; The stiff end of double throw switch is electrically connected with power module outlet; An input end that is electrically connected to rectification module in the normally closed contact of double throw switch and the normally opened contact, the normally closed contact of double throw switch and in the normally opened contact another are electrically connected to electric contact.
This shows; The double throw switch of feed circuit setting is exported after can selecting the electric signal of power module output whether need pass through rectification module; If the user selects to use the work of contact visualization mode; Can press double throw switch, let double throw switch select the electric signal of power module to export, if the user selects to use contactless development through behind the rectification module; Then the user lets double throw switch select the electric signal of power module output directly to export electric contact to, can let user flexibility select the visualization way of laser printer easily like this.
Further scheme is, rectification module also is provided with voltage-stabilizing device, and voltage-stabilizing device is connected between rectifying device and the ground.
It is thus clear that, voltage-stabilizing device is set on rectification module, can guarantee that the direct-flow signal voltage of rectification module output is stable; Avoid the voltage fluctuation of direct current signal; Thereby guarantee to be carried in the voltage constant on the developer roll, formed magnetic field force is also stable, and then guarantees that carbon dust can be transferred on the photosensitive drums.
For realizing another above-mentioned purpose, in the laser printer method of modifying provided by the invention, this laser printer comprises housing; Housing surrounds cavity, and the inside surface of cavity is provided with the electric contact that is used to export the development bias voltage, and circuit board is installed in the housing; Circuit board is provided with feed circuit; Feed circuit are provided with power module, and the output terminal of feed circuit is electrically connected with electric contact, and this method comprises breaks off being electrically connected between feed circuit output terminal and the electric contact; The rectification module of the electric signal that receives power module output is set on feed circuit, is electrically connected the output terminal and the electric contact of rectification module.
Visible by such scheme, on feed circuit, set up rectification module, can make the development bias voltage of feed circuit output convert the direct current that only comprises DC component into, thereby satisfy the need of work that contact is developed by the alternating current that comprises DC component.The user can be installed to the handle box that contact is developed on the laser printer after the repacking, reduces and prints cost, and use also very convenient.
A preferred scheme is; After breaking off being electrically connected between feed circuit output terminal and the electric contact; Double throw switch also is set on feed circuit; The stiff end of double throw switch is electrically connected with power module outlet, an input end that is electrically connected to rectification module in the normally closed contact of double throw switch and the normally opened contact, and the normally closed contact of said double throw switch and in the normally opened contact another are electrically connected to electric contact.
This shows; Between power module and rectification module, double throw switch is set; Export after whether the electric signal that can select power module to export need pass through rectification module, the development bias voltage of feed circuit output can be to include DC component and AC compounent like this, also can be only to comprise DC component; Use contactless development and contact to develop respectively, help the user and select to use.
Description of drawings
Fig. 1 is the structural representation of existing laser printer.
Fig. 2 is the STRUCTURE DECOMPOSITION figure that existing laser printer has dwindled.
Fig. 3 is the structural drawing of existing handle box.
Fig. 4 is the STRUCTURE DECOMPOSITION figure that existing handle box has dwindled.
Fig. 5 is the electrical schematic diagram of existing laser printer feed circuit.
Fig. 6 is the electrical schematic diagram of feed circuit among laser printer first embodiment of the present invention.
Fig. 7 is the voltage oscillogram of power module outlet among laser printer first embodiment of the present invention.
Fig. 8 is the voltage oscillogram at diode anode place among laser printer first embodiment of the present invention.
Fig. 9 is the voltage oscillogram of rectification module output terminal among laser printer first embodiment of the present invention.
Figure 10 is the electrical schematic diagram of feed circuit among laser printer second embodiment of the present invention.
Figure 11 is the structural drawing of laser printer the 3rd embodiment of the present invention.
Figure 12 is the electrical schematic diagram of feed circuit among laser printer the 3rd embodiment of the present invention.
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Embodiment
Laser printer first embodiment:
Present embodiment has housing; Housing surrounds a cavity; A handle box removably is installed in the cavity, and handle box is equipped with developer roll, and developer roll comprises mandrel and is wrapped in the outer elastic layer of mandrel; And an end of mandrel is connected with conducting strip, and the part of conducting strip extends to outside the housing of handle box.
The inside surface of laser printer cavity is provided with an electric contact, and after handle box was installed to cavity, conducting strip contacted with electric contact, and electric contact is exported the development bias voltage through conducting strip to developer roll.And, in the laser printing engine housing, circuit board being installed, circuit board is provided with control circuit, feed circuit of laser printer etc.The difference of present embodiment and existing laser printer is that feed circuit are provided with rectification module.
Referring to Fig. 6; The feed circuit of present embodiment have power module 51 and rectification module 52; Power module 51 has alternating current source AC, and is provided with capacitor C 11, diode D11 and resistance R 11, R12, R13, and the electric signal of its output terminal output includes DC component and AC compounent; And DC component is lower than 0 volt, just is negative voltage.The voltage oscillogram of power module 51 output terminals is as shown in Figure 7, and it is a square wave, and the voltage mxm. is higher than 0 volt.
Rectification module 52 has diode D12, capacitor C 12, resistance R 14, R15 and voltage stabilizing diode ZD1, and wherein diode D12 is as the rectifying device of present embodiment, and the electric signal that power module 51 is exported carries out rectification.The negative electrode of diode D12 is connected with the output terminal of power module 51, and anode is connected with an end of resistance R 15.Because the negative electrode of diode D12 is connected with the output terminal of power module 51; Therefore the direct current of power module 51 outputs can pass through diode D12; Positive half cycle in the AC compounent can not pass through diode D12; But negative half period can pass through diode D12, so the signal on the diode D12 anode is to be lower than 0 volt direct current.
The voltage oscillogram at diode D12 anode place is as shown in Figure 8, and 0 volt the part of being higher than of power module 51 output is filtered, in the voltage waveform only a reservation be lower than 0 volt part.
Rectification module 52 also is provided with the capacitor C 12 that is connected between diode D12 and the ground, and capacitor C 12 is used for electric signal is carried out filtering as filtering device, guarantees that the direct-flow signal voltage waveform of rectification module 52 outputs is steady.
In addition, rectification module 52 also is provided with voltage stabilizing diode ZD1, and voltage stabilizing diode ZD1 is as the voltage-stabilizing device of present embodiment, and itself and resistance R 14 are connected in series, and are connected in then between diode D12 and the ground.Voltage stabilizing diode ZD1 can guarantee that the voltage of diode D12 anode is stable.
Rectification module 52 also is provided with swept resistance R15; The two ends of swept resistance R15 are connected to the anode and ground of diode D12 respectively; And the centre tap of swept resistance R15 is connected to the output terminal 53 of rectification module 52; Like this, through changing tapped position, the magnitude of voltage of scalable output terminal 53 outputs.Certainly, in the present embodiment, output terminal 53 also is the output terminal of feed circuit, and therefore, centre tap also is to be electrically connected with electric contact, thereby to electric contact output development bias voltage.
The electric signal of power module 51 output is through after the rectification of rectification module 52, only comprises the electric signal of DC component and as the output of development bias voltage from output terminal 53 outputs, and the development bias voltage is negative voltage, satisfies the need of work that contact is developed.And rectification module 52 also is provided with filtering device, voltage-stabilizing device, guarantees that the development bias voltage waveform of output terminal 53 outputs is steady, and output voltage stabilization, helps the work of handle box.The voltage oscillogram of rectification module 52 output terminals is as shown in Figure 9, under the effect of filtering device and voltage-stabilizing device, and rectification module 52 output voltage values galvanic currents.
Like this, the user can be installed to the handle box of contact on the laser printer of present embodiment and print work, thereby can save the printing cost.
Laser printer method of modifying first embodiment:
The laser printer of existing contactless development is repacked into the laser printer of the foregoing description; At first need be, and circuit board disassembled with the dismounting of the end cap of laser printing engine housing, break off being electrically connected of feed circuit and electric contact then; And on feed circuit, set up rectification module; Rectification module is arranged between the output terminal of power module and feed circuit, the particular circuit configurations of feed circuit and rectification module such as laser printer first embodiment introduction, repeat no more.
After setting up rectification module, the output terminal of rectification module with on electric contact is electrically connected, after at last circuit board and end cap being installed, can be used.After laser printer carried out above-mentioned repacking, the user can be installed to the handle box that contact is developed in the laser printer after the repacking, saves and prints cost.And the user only needs disposable laser printer is reequiped to get final product, and need not each handle box is reequiped, and greatly facilitates user's use.
Laser printer second embodiment:
Present embodiment has housing; Housing surrounds a cavity; A handle box removably is installed in the cavity, and handle box is equipped with developer roll, and developer roll comprises mandrel and is wrapped in the outer elastic layer of mandrel; And an end of mandrel is connected with conducting strip, and the part of conducting strip extends to outside the housing of handle box.The cavity inner surface of laser printer is provided with electric contact, and after handle box was installed to cavity, conducting strip was electrically connected with electric contact, and electric contact is exported the development bias voltage through conducting strip to developer roll.
In the housing of laser printer circuit board is installed; Circuit board is provided with control circuit, feed circuit of laser printer etc.; The electrical schematic diagram of feed circuit is shown in figure 10; It comprises power module 56 and rectification module 57, and power module 56 comprises alternating current source AC, capacitor C 21, diode D21 and resistance R 21, R22, R23, and the electric signal of its output comprises DC component and AC compounent.
The input end of rectification module 57 is electrically connected with the output terminal of power module 56, receives the electric signal of power module 56 outputs.Rectification module 57 has bridge rectifier circuit, and this rectification circuit is made up of four diode D22, D23, D24 and D25, and this bridge rectifier circuit constitutes the rectifying device of present embodiment, and an one of which output head grounding, another output terminal are the B point.
Visible by Figure 10, an end ground connection of bridge rectifier circuit output positive voltage, an end of output negative voltage is connected to the B point.And, be connected with capacitor C 22 between B point and the ground as filtering device, as the voltage stabilizing diode ZD2 of voltage-stabilizing device be connected between B point and the ground after resistance R 24 is connected.The two ends of swept resistance R25 are connected to B point and ground respectively, and centre tap is electrically connected with output terminal 58, thereby to electric contact output development bias voltage.Therefore, the output terminal 58 of rectification module 57 is lower than 0 volt negative voltage to electric contact output, to satisfy the need of work that contact is developed.
Like this, the user can be installed to the work that prints in the present embodiment with the handle box that contact is developed, and saves and prints cost.
Laser printer method of modifying second embodiment:
The laser printer of existing contactless development is repacked into the laser printer of the foregoing description; At first need be, and circuit board disassembled with the dismounting of the end cap of laser printing engine housing, break off being electrically connected of feed circuit and electric contact then; And on feed circuit, set up rectification module; Rectification module is arranged between the output terminal of power module and feed circuit, the particular circuit configurations of feed circuit and rectification module such as laser printer second embodiment introduction, repeat no more.At last, the output terminal of rectification module and electric contact in the electrical connection are with getting final product after circuit board and the end cap installation.
Laser printer the 3rd embodiment:
Referring to Figure 11, present embodiment has housing 61, and housing 61 comprises loam cake 62 and end cap 63, and loam cake 62 is provided with the press section of switch 64.Housing 61 surrounds a cavity; A handle box removably is installed in the cavity, and handle box is equipped with developer roll, and developer roll comprises mandrel and is wrapped in the outer elastic layer of mandrel; And an end of mandrel is connected with conducting strip, and the part of conducting strip extends to outside the housing of handle box.The cavity inner surface of laser printer is provided with electric contact, and after handle box was installed to cavity, conducting strip was electrically connected with electric contact, and electric contact is exported the development bias voltage through conducting strip to developer roll.
In the housing 61 circuit board is installed, circuit board is provided with control circuit, feed circuit of laser printer etc., and the electrical schematic diagram of feed circuit is shown in figure 12.Feed circuit are provided with power module 66 and rectification module 67; Be connected with switch 64 between the input end of the output terminal of power module 66 and rectification module 67; Switch 64 is a double throw switch; Its stiff end is electrically connected with the output terminal of power module 66, and normally opened contact is connected to the input end of rectification module 67, and normally closed contact is connected directly to the output terminal 68 of feed circuit.
Power module 66 alternating current source AC, capacitor C 31, diode D31 and resistance R 31, R32, R33, the electric signal of its output comprises DC component and AC compounent.Rectification module 67 has the diode D32 as rectifying device, and the negative electrode of diode D32 is connected with the normally opened contact of switch 64.Rectification module 67 also is provided with capacitor C 32 as filtering device, as the voltage stabilizing diode ZD3 of voltage-stabilizing device, voltage stabilizing diode ZD3 be connected between the anode and ground of diode D31 after resistance R 34 is connected.
Also be connected with swept resistance R35 between the anode of diode D32 and the ground, the centre tap of swept resistance R35 is connected to output terminal 68, the electric contact output development bias voltage in cavity.
Because rectification module 67 can carry out rectification with the electric signal of power module 66 output, and forms the electric signal output that only comprises DC component, and this electric signal is to be lower than 0 volt negative voltage, satisfies the need of work of contact development.The user promptly can be installed to the work that prints in the present embodiment with the handle box that contact is developed, and saves and prints cost.
And; Because present embodiment is provided with double throw switch, the user can select the visualization mode of laser printer according to the visualization way of handle box, if handle box is the handle box that contact is developed; Then can switch 64 be selected the position to normally opened contact; Output only comprises the electric signal of DC component, if handle box is the handle box of contactless development, then switch 64 is selected the position to normally closed contact; The electric signal of output terminal 68 outputs comprises DC component and AC compounent, can satisfy the need of work of contactless development.
Laser printer method of modifying the 3rd embodiment:
The laser printer of existing contactless development is repacked into the laser printer of the foregoing description; At first need be, and circuit board disassembled with the dismounting of the end cap of laser printing engine housing, break off being electrically connected of feed circuit and electric contact then; And on feed circuit, set up rectification module; Rectification module is arranged between the output terminal of power module and feed circuit, the particular circuit configurations of feed circuit and rectification module such as laser printer the 3rd embodiment introduction, repeat no more.
And, set up rectification module after, also need increase switch, this switch is a double throw switch, the connected mode of double throw switch such as laser printer the 3rd embodiment introduction.At last, the output terminal of rectification module and electric contact in the electrical connection certainly, also need be directly connected to the output terminal of power module on the electric contact.Like this, can let the user select the visualization mode of laser printer, more help the user freely select use.Certainly, the press section of switch need be arranged on the surface of shell of laser printer, with user friendly pressing operation.
Certainly, the foregoing description only is the preferable embodiment of the present invention, during practical application more variation can also be arranged, and for example, among the 3rd embodiment, the normally opened contact of double throw switch is electrically connected with output terminal, and normally closed contact is connected with the input end of rectification module; Perhaps, rectification module is not provided with filtering device, voltage-stabilizing device and swept resistance, directly exports electric signal to electric contact by diode, and such change can realize the object of the invention equally.
It is emphasized that at last to the invention is not restricted to above-mentioned embodiment, also should be included in the protection domain of claim of the present invention like the variations such as change of the particular circuit configurations change of rectification circuit, filtering device, voltage-stabilizing device.

Claims (10)

1. laser printer comprises
Housing, said housing surrounds cavity, and the inside surface of said cavity is provided with the electric contact that is used to export the development bias voltage;
Be installed in the circuit board in the said housing, said circuit board is provided with feed circuit, and said feed circuit are provided with power module, and said power module is used for to said electric contact output development bias voltage;
It is characterized in that:
Rectification module, said rectification module receive the electric signal of said power module output, and the output terminal of said rectification module is electrically connected with said electric contact.
2. laser printer according to claim 1 is characterized in that:
Double throw switch; The stiff end of said double throw switch is electrically connected with said power module outlet; An input end that is electrically connected to said rectification module in the normally closed contact of said double throw switch and the normally opened contact, the normally closed contact of said double throw switch and in the normally opened contact another are electrically connected to said electric contact.
3. laser printer according to claim 1 and 2 is characterized in that:
Said rectification module has rectifying device, and said rectifying device is lower than 0 volt d. c. voltage signal to said electric contact output.
4. laser printer according to claim 3 is characterized in that:
Said rectifying device is a diode, and the negative electrode of said diode is connected to the output terminal of said power module, and the anode of said diode is connected to said electric contact.
5. laser printer according to claim 3 is characterized in that:
Said rectification module also is provided with filtering device, and said filtering device is connected between said rectifying device and the ground.
6. laser printer according to claim 3 is characterized in that:
Said rectification module also is provided with voltage-stabilizing device, and said voltage-stabilizing device is connected between said rectifying device and the ground.
7. laser printer according to claim 3 is characterized in that:
Said rectification module also is provided with swept resistance, and the two ends of said swept resistance are connected to said rectifying device and ground respectively, and the centre tap of said swept resistance is electrically connected with said electric contact.
8. the method for modifying of laser printer, said laser printer has housing, and said housing surrounds cavity; The inside surface of said cavity is provided with the electric contact that is used to export the development bias voltage; In the said housing circuit board is installed, said circuit board is provided with feed circuit, and said feed circuit are provided with power module; The output terminal of said feed circuit is electrically connected with said electric contact, it is characterized in that: this method comprises
Break off being electrically connected between said feed circuit output terminal and the said electric contact, the rectification module of the electric signal that receives said power module output is set on said feed circuit, be electrically connected the output terminal and the said electric contact of said rectification module.
9. laser printer method of modifying according to claim 8 is characterized in that:
This method also comprises:
After breaking off being electrically connected between said feed circuit output terminal and the said electric contact; On said feed circuit, double throw switch is set; The stiff end of said double throw switch is electrically connected with said power module outlet; An input end that is electrically connected to said rectification module in the normally closed contact of said double throw switch and the normally opened contact, the normally closed contact of said double throw switch and in the normally opened contact another are electrically connected to said electric contact.
10. it is characterized in that according to Claim 8 or 9 described laser printer method of modifying:
Said rectification module has rectifying device, and said rectifying device is lower than 0 volt d. c. voltage signal to said electric contact output.
CN201110364123.XA 2011-11-16 2011-11-16 Laser printer and modification method thereof Active CN102508417B (en)

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