CN1241157A - Polymeric processing system for producing ophthalmic lenses - Google Patents
Polymeric processing system for producing ophthalmic lenses Download PDFInfo
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- CN1241157A CN1241157A CN 97180884 CN97180884A CN1241157A CN 1241157 A CN1241157 A CN 1241157A CN 97180884 CN97180884 CN 97180884 CN 97180884 A CN97180884 A CN 97180884A CN 1241157 A CN1241157 A CN 1241157A
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Abstract
A lens making system for producing ophthalmic lenses using a combination of heat and light to polymerize a liquid resin has a personal computer-based architecture. Electronic ballasts modulate the light from a light source in the system. All of the cooling necessary for the system is provided by a cooling fan of the power supply of the system. A bar code-reading pen checks compatibility between materials and resin and ensures that appropriate cure cycles are activated, and a modem allows for remote accessing of the system to facilitate automatic reordering and inventory control of the system.
Description
By resin film being solidificated on optics preform, wafer or the single focal lense method and apparatus of making ophthalmic lens is known, as U.S. Patent No. 5,219,497 introduced like that.The method of selecting the position of additional eyeglass and cured lens material is at United States Patent (USP) 5,178, discusses in 800.And using light and heat also is the monomer resin layers of polymer known on haplopia power lens, as at United States Patent(USP) Nos. 5,470, discussed in 892 and 5,147,585 like that.All these patents are enrolled this specification for your guidance.
In conjunction with controlled heating curve, the duration of the light that lens manufacturing system control is provided by cure lamp and fluorescent lifetime are so that make ophthalmic lens.Usually, use mechanical shutter to modulate described light so that the control radiant exposure.Yet mechanical shutter can not be by accurately control light modulation of expectation.And the machine components that constitute shutter damage easily, therefore may bring the integrity problem of lens manufacturing system.And some lens manufacturing systems are used LCD space light modulator (LCSLMs), because their intrinsic limited transparencies under pure state, described LCD space light modulator (LCSLMs) is easy to generate heat in system work process.
And the heat energy utilization rate of known lens manufacturing system is quite low.Therefore, the lens manufacturing system need use a plurality of fans and/or circulating pump additionally to cool off usually.
Another problem that lens maker ran into of actual optist and use known lens manufacturing system is to preserve the stock of a large amount of single focal lenses and other optics preforms, and, always worry in the selection of the relevant cure cycle of multiple lens material, resin and system, may have problems.
Therefore, need a kind of improved ophthalmic lens manufacturing system.
Therefore, the invention provides a kind of improved ophthalmic lens manufacturing system, this system is reduced to minimum design for the shortcoming prior art.This system comprises unique parts combination, so that realize utilizing heat and ultraviolet and/or visible light that resin bed is solidificated on the single focal lense, thereby makes ophthalmic lens fast and efficiently.Specifically, the invention provides can be in the lens manufacturing system of office operation, and very short hardening time is made high-quality ophthalmic lens in this system's utilization, between 15 to 40 minutes, decides according to the composition of optical resin usually.This system is particularly suitable for making bifocus and multifocal eye section lens, but also can be used for even resin bed is solidificated in single focal lense.
This system is controlled by microprocessor, allows exploitation to have the lens manufacturing system of utilizing personal computer architecture.Use utilizes the system of personal computer to be convenient to realize two key characters of the present invention.Provide optical scanner or bar code recognition pen or light pen so that read in automatically, allowed handled all quality requirements of system keeps track system about pitch tube with about the information of haplopia lens envelope.Enter this information scanning also to allow microprocessor to check compatibility between material and the resin, so that guarantee to start suitable cure cycle.
In addition, this system has modem, so that allow the remote information that obtains to be stored in the system.Having modem in the system is very easy to automatically order again and stores the lens manufactured materials subsequently.
This system provides high stability heat and ultraviolet and/or visible radiation, and this radiation produces highly reproducible cured product.By lamp and curing room being separated and the air flow design that keeps the lamp cooling being provided, make that the source efficiency of system is the highest, thereby improve described cured product.Particularly, utilize the thermantidote of system power supply to provide system required whole coolings basically.Eliminate the necessity of additional thermantidote or circulating pump like this, and had the good attendant advantages of system's noise reduction.
This system also provides and has been used for the mechanism of temporary transient modulation from the light of cure lamp, and the power supply that is used to control the electronic ballast device of cure lamp by control is realized.Use the electric ballast modulated light source overcome with prior art in the relevant problem of modulator approach used, for example mechanical shutter and LCSLMs.
System also provides unique and has utilized the method for heat energy efficiently, has low-down energy consumption.As the part of heat utilization system, the shunting forced air-ventilating system is arranged in the curing room of device, and hot-air that enters from heating element heater and the air that returns that flows out curing room are separated.The shunting forced air-ventilating system can be arranged in the curing room so that the indoor temperature balance.
With reference to below in conjunction with the detailed description of accompanying drawing, these and other feature and advantage of the present invention will become better understood, so that understand these and other feature and advantage of the present invention.
Fig. 1 is the perspective schematic view according to lens manufacturing system of the present invention;
Fig. 2 is the electronic block diagram of the electronic system of the lens manufacturing system among Fig. 1;
Fig. 3 is the schematic front view of the light and heat system of the lens manufacturing system among Fig. 1;
Fig. 4 is the side cross-sectional view of the curing room of the lens manufacturing system among Fig. 1;
Fig. 5 is the section front view of the curing room of the lens manufacturing system among Fig. 1;
Fig. 6 is the back sectional view of the lens manufacturing system among Fig. 1;
Fig. 7 is the selection thermal characteristics curve of the lens manufacturing system among Fig. 1, comprises furnace temperature, mold temperature and light temperature, and the lamp work period of representing cure cycle; And
Fig. 8 is the automatic stock of the lens manufacturing system among Fig. 1 and the schematic diagram of processing parameter feature;
With reference now to accompanying drawing,, the most preferred embodiment of lens manufacturing system is shown among Fig. 1 at present.System 10 has the structure of utilizing computer, and comprises and be used to make the especially curing room of bifocus and multi-focus lens of ophthalmic lens, utilizes the light and heat radiation, and especially ultraviolet and/or visible light are solidificated in resin bed on the single focal lense.Curing room comprises adiabatic stove 12 and is positioned at the ultraviolet and/or the visible light source 14 (Fig. 3) of stove 12 tops.Light source 14 provides ultraviolet and/or visible light to the inside of stove, and mould pallet 16 is positioned at the inside of stove.As what below will describe in detail, be provided with electric ballast 18 so that the control light source offers the light of curing room.
The mould that will be cured to the resin on the haplopia power lens is housed to be placed on the mould pallet 16.Dispenser device 20 permission resins are distributed in the mould inside on the mould pallet automatically.In present most preferred embodiment, dispenser device 20 comprises stepper motor 22 (Fig. 2) and resin is discharged into the plunger of internal system from disposable syringe.Stepper motor 22 preferably can become to be 0.01 millimeter as far as possible resin distribution meticulously.Can add additional allocation device 24 so that improve the distribution capability of system.
These elements are contained in the shell 11 of system 10, and shell 11 is preferably made by cold-rolled steel, also can for example aluminium or plastics are made by other materials that are fit to.
The state of back illumination LCD 26 indication mechanisms, and the permission system is to user prompt information.The other system information for example state of light irradiation time, solid state and stove is presented at light emitting diode 28 (LED ' s), and light emitting diode 28 is along the front portion of the state indication panel 30 of system.Keyboard 29 on the system front allows system operator to select different operations and input data.
Optical pickocff or bar code scanning identification pen 31 are realized automatically the information of relevant lens processing parameter being input in the system, for example resin and lens material data.In addition, the modem 33 (Fig. 2) of internal system realizes that employed material is ordered goods and storage subsequently, for example haplopia power lens, wafer and resin automatically again in the ophthalmic lens manufacture process.System 10 also comprises floppy disk 32, is used for the installation and upgrade systems soft ware.
With reference now to Fig. 2,, shows the most preferred embodiment of electronic control system.The core of electronic system of the present invention is a motherboard 34, preferably is equipped with Intel386,486 or 586 microprocessors.Use motherboard 34 to make the lens manufacturing system have the structure based on personal computer (PC-based), this structure relatively has several significant advantages with present other unfavorable lens manufacturing systems with computer.For example, utilize the structure of personal computer to make it possible to high-level language for example C or C
++Exploitation and maintenance system software.Another advantage of utilizing the structure of personal computer is to use the additional and additional hardware that designs as personal computer.By module " plug and play " technology of utilizing personal computer to use, can be by minimum development time and relevant input, can add new key character on the manufacturing system bar code scanning identification pen 31 and the modem 33 of for example communicating by letter with motherboard 34.
Interface board 36 is set up communication link by standard A T bus between motherboard 34 and other parts of system.The main purpose of interface board 36 is the logical links that provide necessary between AT-bus and system element.Interface board 36 provides Digital Logic to a series of switch electronic circuits 38, wherein other part optics isolation of logic level and Digital Electrical Circuitry of the power supply that is useful on conversion.For example, use optics driver for isolating 40,42 to open and close power transistors, metal oxide semiconductor field effect tube (MOSFETs) for example is so that switch on and off the 12VDC power supply of electric ballast 18.
The heating element heater 44 usefulness 115VAC of stove 12 or 240VAC power supply, and by having the TRIAC optics isolating switch control of intrinsic zero passage detection.Zero passage detection prevents to occur in AC connection process does not expect noise.Zero passage detection has also realized the pulse width modulation controlled of heating element heater 44, so that continuously and effective heating system.
Use DC motor 46 revolving burner fans 48, stove fan 48 makes heat solidify indoor circulation.Be used to control the logic level of this motor also by isolation of high-power MOSFET s optics and control.In addition, the heat sensor 50 that is positioned at curing room directly provides temperature information to interface board 36.
Using many I/O plate 52 to provide between the hard disk drive 54 of motherboard 34 and component computer communicates by letter.Hard disk drive 54 is used for storage system software and system manipulation person's material consumption situation record.Many I/O plate 52 also to floppy disk 32 for example 3.5 inches floppy disks communication is provided, described floppy disk is used for the installation and upgrade systems soft ware.In addition, many I/O plate 52 provides the COM1 of bar code scanning identification pen 31, and bar code scanning identification pen 31 is used for directly the information about lens and resin being input in the system by the bar code information about pitch tube and lens envelope.
Optical pickocff 56 is used to limit the motion of the stepper motor 22 of distributor 20.Distributor 20 starts by pressing charging switch 58, and described charging switch directly links to each other with interface board 36.
In addition, keyboard 29 allows the system manipulation person directly order to be input to interface board 36, and interface board 36 is given motherboard 34 described command transfer.Provide the back illumination LCD display 26 of system status information also to be connected on the interface board, interface board is transferred to LCD display to information from motherboard.
Fig. 3 has described the light and heat system of present most preferred embodiment of the present invention.Heat that utilization is highly controlled and ultraviolet and/or visible light are aggregated in liquid resin layer on the single focal lense that is positioned in the curing room.Best, light source 14 separates and the heat isolation with the thermal source of system.Shown in Fig. 3-6, light source 14 is positioned at the above and below of curing oven 12.Light source is placed on the outside of heating furnace, owing to allow lamp to remain on the temperature more much lower, makes the efficient maximum of lamp than stove.For example, though the temperature of stove may reach 220 Fahrenheit temperature, and lamp remains between 80 to 120 Fahrenheit temperature.Keep lamp very important for the efficient of life-span that prolongs lamp and raising lamp in lower temperature.
Light source 14 is ultraviolet/or visible fluorescence pipe preferably, and for example Philips PLS-9W/08, PLS-9W/10 or PLS-9W/27 have maximal illumination between 300 to 400 nanometers.Though lamp will be in (the 50 or 60Hz) work down frequently of different line, the efficient of lamp will be higher under higher frequency.
Stove 12 by durable material for example stainless steel or aluminium make, and use suitable material for example glass fibre or the thermal insulation of high temperature foam plastics.Because light source 14 is placed on the outside of curing oven, on stove 12, form optical window 60, so that allow light to be transferred in the curing room.In the embodiment shown in Fig. 3-6, two optical windows 60 on the upper and lower surface 62 and 64 of curing oven 12, are provided respectively, so that permission illumination is mapped to the mould in the curing oven.Optical window 60 preferably is at least 90% high temp glass by the optical transmittance in 360 to 600 nanometers and makes, and for optical window is fixed on the position, uses becket and the high temperature foam rubber washer made by stainless steel or anodization cold-rolled steel.
It is even so that guarantee to enter the light of stove 12 that the most handy collimating mirror 66 surrounds optical window 60.Be used on single focal lense forming the resin of additional optical focal power for even curing, light intensity is crucial uniformly.
With reference now to Fig. 4-6,, other details of curing room has been described.Fig. 4 is the side cross-sectional views of curing oven 12, and curing oven 12 covers layer of glass or fluid insulation 68.Optical window 60 allow ultraviolets or visible light from top or below enter curing oven.Mould pallet 16 is positioned at curing oven 12, and comprises by metal tray 72 and be supported on locational a pair of mould 70.Mould 70 can be glass or plastics, preferably grind and form or form, for example Merlon, polypropylene or polyethylene polypropylene copolymer by the transparent plastic die casting by crown glass (crown glass).
In the course of work of curing oven 12, the haplopia power lens of liquid resin and a pair of plastics are placed in the mould 70.Utilize Sirocco fan 48 blow air to heat to stove by stratie 44.Fan 48 is driven by DC motor 46, and is designed to towards the rotating shaft direction suction air of motor along it, along all direction blow out air.Specially designed shunting forced air-ventilating system 74 realizes the steady circulation of hot-air in stove between heating element heater and mould.
With reference now to Fig. 5,, the front sectional view of curing oven 12 has been described.In this view, the width short about 45% of shunting forced air-ventilating system 74 than stove 12 is shown.This hot-air that allows to be blown by heating element heater 44 enters stove 12 by the top 75 of stove equably, and the air that returns from the bottom of stove is evenly extracted out from the bottom left and right sides 77 and 79 of stove.Should be noted that can be shunting forced air-ventilating system 74 relative stoves left or move right, so that adjust the interior temperature balance of stove.
In addition, heat sensor 50 is arranged on the top at the right hand angle of stove 12.The position of heat sensor 50 is for realizing that accurate and representational measurement furnace temperature is crucial.Usually, the position shown in Fig. 5 is consistent with the counter rotation of stove fan 48, because consider the measurement point of multi-layer air stream like this.
Other features of cooling system are shown among Fig. 6, and Fig. 6 is the back sectional view of whole system.A plurality of transom windows 80 are arranged on the sidewall of system so that allow cold air to enter system.Transom window 80 is covered by a series of pipe-line system 82 parts, and pipe-line system 82 is directed to the top of lamp to air stream, prevents from simultaneously to leak by undesirable light of transom window.Thermantidote 57 on the system power supply 55 is the cold air intake line and be forced through the Lower Half of system.By controlling air movement by this way, twitch the coldest air by lamp 14, the torrid zone that lamp produces is walked, keep the lamp efficiency operation.Surplus air flows through electronic system, and described electronic system is arranged on the framework 84, and framework 84 is installed in left-hand side 85 under the inside of system 10.Base plate 84 makes and is used for the serial port that uses I/O plate 52 easily bar code scanning identification pen 31 is connected to system.In addition, also visit modem 33 easily by the rear portion of base plate 84.
Cooling system is worked with the light and heat system so that cured resin suitably.Should notice that suitable cured resin also is subjected to the influence of stove thermal control.In present most preferred embodiment, furnace temperature is controlled in passing ratio, integration, differentiate (Proportional, Integral, Derivative) (PID) control algolithm carefully.Pid control algorithm is described in appendix A, and appendix A is additional in this manual, and appendix A is enrolled this specification so that reference.This algorithm is used for determine supplying with the correct dutycycle of pulse width modulation controlled of the electrical power of heating element heater.Like this, can minimum overshoot reach the design temperature point.The pulse width modulation controlled that adds heat also allows maximal duty cycle is adjusted into the different AC voltage levvls that adaptation is used all over the world.Best, use the heating element heater that 350 watts of power are provided during in 100% maximal duty cycle at 120VAC in the system.Because power be proportional to voltage square, same heater provides 350 watts power during in 25% maximal duty cycle at 240VAC.Like this, same heating element heater can be used for 120VAC or 240VAC, and still provides cured resin needed all heat energy.Therefore, the lens manufacturing system that provides here can be used for all over the world.
Usually, the thermal control of curing oven must be in a certain qualification so that realize the repeatably cured product of making peace.In present most preferred embodiment, this system has following thermal control characteristic: (1) actual air temperature in cure cycle in the stove be controlled at temperature set-point+/-5 Fahrenheit temperature scopes in; (2) mold temperature variation from left to right is from being no more than 7.5 Fahrenheit temperature; (3) rate of temperature change preferably be controlled at be no more than 15 Fahrenheit temperature/minute; And the temperature in (4) stove should not surpass 220 Fahrenheit temperature.
Similarly, the intensity of lamp must be in a certain limited range, so that realize the repeatably cured product of making peace.In present most preferred embodiment, the intensity of lamp is 2000 to 3000 millijoule/square centimeters in nominal wavelength 390 nanometers.By using different materials and lens type repetition test, find that light and heat control and these qualifications of this level are necessary, so that keep the product unanimity of final product.Otherwise the performance such as marresistance, adhesive force and optics and aesthetic property may affect adversely.
Fig. 7 shows the example that adopts the present invention to make the representative cure profile of a pair of ophthalmic lens.The temperature set-point of systems soft ware is enrolled in dotted line 87 expressions on top.This temperature curve is determined by series of factors, is comprised the material type of resin chemical property, lens and the kind of design of lens.The solid line 89 on top is actual furnace temperature, records by the center of J-type thermocouple from stove.In addition, the temperature of middle dotted line 91 expression left side mould 70a, the temperature of middle solid line 93 expression the right mould 70b.
Shown in curve, mold temperature is from left to right very consistent, and this is because the result of careful balance air stream.Because the big thermal capacity of glass or mould of plastics, mold temperature obviously lags behind air themperature.This is a key factor will considering when manufacturing and designing the heating curve of lens.
Fig. 7 also shows the curve of system's lamp in solidification process.At solidification process preceding 5 minutes do not have lamp to open, and mould, lens and resin are placed in the dark, and make and slowly heat up.Second of the cycle 5 minutes along with the actinic radiation sources of stove upper and lower is glistened simultaneously or is glimmered, allow furnace temperature to change very lentamente.After preceding 10 minutes, lamp is opened the while furnace temperature continuously and is changed continuously, up to reaching last static temperature.
When heating furnace, monitor that other temperature in the curing room are very important, because they may the remote-effects solidification process.Near the center of the solid line 95 expression system middle and upper part lamps of Fig. 7 middle and lower part air themperature.Notice that following this point is very important, promptly this solid line shows that near the temperature the lamp 14a of top slowly descends reposefully in preceding 10 minutes of cure cycle, though in fact interior at one time stove reality is heated to 130 Fahrenheit temperature from about 115 Fahrenheit temperature.This means and between stove and lamp, almost do not have heat exchange.When lamp was connected continuously after preceding 10 minutes, obviously near the air themperature the lamp slowly rose to about 120 Fahrenheit temperature when cure cycle finishes.This means that near the origin of heat the lamp mainly is a lamp itself.
Near among Fig. 7 the bottom of curve map the dotted line 97 by the bottom is represented near the air themperature in lamp 14b center of system middle and lower parts.Though with the similar variation tendency of lamp process on top, the temperature of bottom lamp surpasses 105 Fahrenheit temperature never, this is because the air circulation of this position is better slightly.
Near near among Fig. 7 the bottom the longer dotted line 99 expression internal system Digital Electrical Circuitries air themperature.Here temperature keeps low relatively, is not higher than 110 Fahrenheit temperature in whole cure cycle.As shown in Figure 7, in fact almost there is not heat energy to leak into other parts of system from curing oven 12.
With reference to figure 8, the scanning identification pen 31 in the detailed description system 10 and the effect of modem 33.Combine with the system architecture of utilizing personal computer, these elements make the present invention not only from motion tracking with order stock again, and produce the processing parameter of the ophthalmic lens that will make.For example, pitch tube 100 can comprise the bar code information 102 about the identification number of resin chemical property, closing date, lot number and uniqueness.Similarly, the bar code information 104 about haplopia power lens envelope 106 can comprise for example about material type, lens distance and astigmatic focal power and unique identification number information.By utilize bar code recognition pen 31 this information scanning in system, the system manipulation person can provide the necessary information that the employed material of system is write down comprehensively to system, thereby allows handled all follow-ups of quality of system.In addition, this information allows the compatibility between automatic checking material and the resin, and guarantees to start suitable cure cycle.
Coded data is by in the direct input system of serial port at system rear portion.Modem line 33 allows in remote operating system; All like this lens casting records can download to central site 110.In case central site 110 receives casting registration from system's website, according to the requirement of system operator can land or air transport satisfy the definite material that the system operator stock requires.Great convenience is provided for like this system operator and materialman.If system operator can be restocked from the producer soon, he can preserve more a spot of stock so.In addition, the materialman can be according to the moving average planned production of all system's consumptions of this regional market.And, can remote access casting registration will allow the materialman to preserve the field warehousing of material circulation, and needn't carry out on-the-spot physical audit in the system operator position.
Though illustrated and described different embodiments of the invention, those skilled in the art obviously can carry out many other improvement and not break away from principle of the present invention.Therefore should be appreciated that, can in the appended claims scope, implement the present invention, rather than only as specifically described.
Appendix A
The pid control algorithm of innotech lens combination chamber
Preface
In order accurately to control (adjustment) furnace temperature, utilize adjustable math equation to the temperature (setting value) of wishing.This equation is called Proportional, Integral, Derivative (PID) equation.Do not use the Derivative component.The PID equation has Proportional component (directly being proportional to the Pterm of error between desired temperature (desired value) and the actual temperature (measured value)) and Integral component (Iterm of expression error amount history).Three kinds of heating adjustment modes are arranged: Warm-up pattern, Default pattern and Curing pattern.Calculate the Integral item according to heating mode with two kinds of methods.
The PID equation is:
PIDout＝Pterm+Iterm
Wherein, according to the heating adjustment modes,
Pterm＝PconstWARM?*?Error
Iterm＝IconstWARM?*?(Averge?of?last?6?errors)
Or:
Pterm＝PconstDEFAULT*Error
Iterm＝IconstDEFAULT*(Averge?of?last?6?errors)
Or:
Pterm＝PconstCURE?*?Error
Iterm＝ItermPREVIOUS+[Error*(2/IconstCURE)]
Every 550ms in the time period stove heating connect once and disconnect once.The 550ms time period is divided into 50 11ms increments.When the given 550ms time period began, the stove heating was connected.Then, according to the value of PIDout, disconnect the stove heating, and keep disconnection to begin up to the next 550ms time period at a certain increment place of 50 possible 11ms increments.The time that adds thermal cutoff at the 550ms time that stove heating is connected in the time period and stove is called the work period.For example, if stove heating in half of 550ms time period (25*11ms=275ms) is connected, the work period will be 50% (10*11ms=110ms), and the time for 1/5th, the work period will be 20%.Every 550ms repeats to switch on and off the work period, unless the heating of order stove keeps disconnecting.
Pconst and Iconst value can be revised in Utilities Menu.Can in 0 to 99 scope, adjust these values.For Pconst, its value is big more, and is big more to the correction ratio response of error.For Iconst, during WARM-UP and DEFAULT pattern, its value is big more, and is big more according to the correction integration response of nearest error history.For Iconst, during the CURING pattern, its value is more little, revises response and will produce the necessary value of zero error place zero-in soon more.
Calculate the Proportional and the Integral item of PID equation.
Pterm＝PconstCURE*TEMPerr
Iterm＝ItermPREVIOUS+[(TEMPerr*(1/IconstCURE))]
Wherein ItermPREVIOUS was calculated by former average measurement value.
Calculate the PID output valve
Read the value of A/D heat sensor and be stored in 3 yuan of cyclic buffers for three times each second, and calculate the mean value of 3 values that read at last.
In the beginning of next 550ms time period, according to the new measurement temperature of reading calculating of current average A/D heat sensor.This measurement temperature value is calculated as follows:
Suppose:
A/D reading-0 is equivalent to 70 °F
A/D reading-255 is equivalent to 230 °F
So total temperature range=230-70=160
TEMPmeas＝70°F+x
A value between x=0 to 160 wherein
This can be used as ratio:
Y=A/D reading value (0-255) wherein
So TEMPmeas=70 °F+x
＝70°F+[y*(160°F/255)]
For WARM_UP or DEFAULT pattern:
Calculate Error and AverageEerror between Current Temperatures setting value and the TEMPmaes.
TEMPerr＝TEMPset-TEMPmease
ERRORbuff＝ERRORbuff+TEMPerr
(ERRORbuff always place last 6 TEMPerr and)
ERRORavg＝ERRORbuff/6
Calculate the Proportional and the Integral item of PID equation.According to the heating adjustment modes, constant is DEFAULT or is WARM.
Pterm＝PconstDEFAULT*TEMPerr
Iterm＝IconstDEFAULT*ERRORavg11111111
PIDout＝Ptem+Item
For the CURING pattern:
TEMPerr＝TEMPset-TEMPmeas
The evaluation work cycle
Work period is output as the basis with PID.When beginning 550ms during the time period, OFFcnts=11ms increment number (may not be 50) is up to interrupting heating.
See following ratio:
Therefore
Work period Duty Cycle=OFFcnts/50 * 100%
Value 500 is maximum permissible values of PIDout.This means that the PIDout value more than or equal to 500 is equivalent to 50 11ms increments or 100% work period.
Work period is also according to being added to AC voltage levvl on the stove heater decay (reducing).If AC voltage is 120VAC, do not need decaying power supplies (work period) so.But the AC voltage of 240VAC, (voltage improves twice, and power improves 4 times, and the two is 4/1 relation) need be added to power supply (work period) decay 1/4th on the stove heater.
So:
OFFcnts (decay)=[x* (100-ATTENconst)]/100
And:
Duty Cycle=OFFcnts (decay)/50
Sum up:
When each 550ms time period begins, calculate the number (in 50) of 11ms time period when the stove heating is disconnected according to PID output valve (may decay).Connect stove heating (if calculating section turn-on time of at least one 11ms) then.When the 11ms time period number that calculates in the past after, disconnect the stove heating and also keep disconnecting, up to begin repetition this one-period in the next 550ms time period.
Claims (20)
1. lens manufacturing system that is used to make the personal computer control of ophthalmic lens, this system comprises:
Curing room; And
Be used to control the microprocessor of lens manufacturing system, wherein curing room and microprocessor are integrated is placed in the unit.
2. according to the lens manufacturing system of claim 1, further comprise the optical scanner that is operably connected on the microprocessor.
3. according to the lens manufacturing system of claim 1, further comprise the modem that is operably connected on the microprocessor.
4. according to the lens manufacturing system of claim 2, wherein optical scanner comprises the bar code recognition pen.
5. according to the lens manufacturing system of claim 3, further comprise at least one be positioned at the outside of curing room and with the light source of curing room thermal insulation.
6. according to the lens manufacturing system of claim 5, further comprise the electric ballast that is used to modulate at least one light source.
7. according to the lens manufacturing system of claim 6, further comprise the power supply with thermantidote, this thermantidote provides system needed all coolings basically.
8. lens manufacturing system that is used to make ophthalmic lens, this system comprises:
At least one light source; And
At least one electric ballast is used to modulate at least one light source.
9. lens manufacturing system according to Claim 8 further comprises the electronic installation that is used to control at least one electric ballast.
10. according to the lens manufacturing system of claim 9, electronic installation wherein comprises power transistor.
11. a lens manufacturing system that is used to make ophthalmic lens, this system comprises:
Curing room;
Be used to control the microprocessor of lens manufacturing system, wherein curing room and microprocessor are integrated is placed in the unit; And
Power supply of microprocessor with thermantidote;
Wherein said power supply thermantidote provides system needed all coolings basically.
12. according to the lens manufacturing system of claim 11, comprise that further at least one is positioned at the light source of the outside of curing room, with a plurality of unit one end transom windows relative that are positioned at described thermantidote.
13. according to the lens manufacturing system of claim 12, further comprise and the corresponding pipe-line system of a plurality of transom windows, be used for direct cold air by described at least one light source.
14. a lens manufacturing system that is used to make ophthalmic lens, this system comprises:
Curing room with top and bottom;
Be placed on the mould pallet in the curing room;
Be positioned at the heating element heater at curing room rear portion, substantially the top of contiguous curing room;
The stove fan, be located substantially on heating element heater under and the bottom of contiguous curing room; And
The shunting forced air-ventilating system is used for the thermal air current from heating element heater is opened with the air flow point that returns the stove fan, and described forced air-ventilating system is between curing room inner mold and heating element heater.
15. according to the lens manufacturing system of claim 14, wherein curing room has the rear wall that certain width is arranged, the width of wherein said forced air-ventilating system is substantially less than the width of described rear wall.
16. according to the lens manufacturing system of claim 15, the width of wherein said forced air-ventilating system is approximately 55% of described curing room rear wall width.
17. a lens manufacturing system that is used to make the personal computer control of ophthalmic lens, this system comprises:
Curing room;
Be used for providing the device of heat to curing room;
Be used for providing the device of light to curing room; And
The integrated micro processor, apparatus that in system, is used to control heating plant and lamp device;
Wherein said lens manufacturing system has the structure of utilizing personal computer.
18., further comprise being used for the device of optical scanner about the coded message of the processing parameter of ophthalmic lens according to the lens manufacturing system of claim 17.
19., further comprise the device of the processing parameter that is used to store ophthalmic lens according to the lens manufacturing system of claim 18.
20. the lens manufacturing system according to claim 19 further comprises the device that is used for the described lens manufacturing system of remote access.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97180884 CN1241157A (en) | 1996-12-20 | 1997-12-19 | Polymeric processing system for producing ophthalmic lenses |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60/034,276 | 1996-12-20 | ||
| CN 97180884 CN1241157A (en) | 1996-12-20 | 1997-12-19 | Polymeric processing system for producing ophthalmic lenses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1241157A true CN1241157A (en) | 2000-01-12 |
Family
ID=5177938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97180884 Pending CN1241157A (en) | 1996-12-20 | 1997-12-19 | Polymeric processing system for producing ophthalmic lenses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1241157A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972585A (en) * | 2015-08-04 | 2015-10-14 | 江苏东宝光学有限公司 | High-temperature curing furnace |
-
1997
- 1997-12-19 CN CN 97180884 patent/CN1241157A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972585A (en) * | 2015-08-04 | 2015-10-14 | 江苏东宝光学有限公司 | High-temperature curing furnace |
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