CN100443947C - Method for controlling image-forming apparatus - Google Patents
Method for controlling image-forming apparatus Download PDFInfo
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- CN100443947C CN100443947C CNB2005800217614A CN200580021761A CN100443947C CN 100443947 C CN100443947 C CN 100443947C CN B2005800217614 A CNB2005800217614 A CN B2005800217614A CN 200580021761 A CN200580021761 A CN 200580021761A CN 100443947 C CN100443947 C CN 100443947C
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- image processing
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Abstract
Even in an image-forming apparatus including an optical deflection apparatus using a light source such as a high-power laser light source, a variation in temperature of an optical deflector due to modulation of deflected light based on drawing data is compensated to maintain a preferable oscillation state of the optical deflection apparatus. The optical deflection apparatus includes an optical deflector in which an oscillator is supported by an elastic support member to be oscillatable about a support substrate and at least one light source, and the optical deflection apparatus is controlled such that total power of light emitted from the light source to the optical deflector within each of a plurality of divided time regions corresponding to specific times of equal lengths becomes a predetermined power. A changed temperature of the optical deflector which is caused due to a variation in power of light emitted from the light source to the optical deflector may be corrected by a temperature control element based on the power of the light emitted from the light source to the optical deflector within the specific time to control the optical deflection apparatus.
Description
Technical field
The present invention relates to a kind of method of controlling light-deflection apparatus, this light-deflection apparatus comprises the oscillator that can use the technology formation that for example relates to the microstructure technology field.Specifically, the present invention relates to control the image processing system that uses light-deflection apparatus, such as the method for type scanner, laser printer or digital copier.
Background technology
Up to the present, the various light-deflection apparatus that optical frames resonates have therein been proposed.Compare such as the photoscanning optical system of the polygonal rotating mirror of polygonal mirror with use, the light-deflection apparatus of resonance-type has following feature: the size of light-deflection apparatus can significantly reduce; Because so Q value high energy consumption is little; There is not optical surface crooked (optical face tangle error) in theory; The light-deflection apparatus of being made by the monocrystalline silicon of particular semiconductor technology making does not have metal fatigue in theory and has remarkable permanance (seeing the open No.S57-008520 of Japanese laid-open patent application).
But there is such problem in the light-deflection apparatus of resonance-type, and wherein material behavior changes with variation of ambient temperature, makes resonant frequency drift about, thereby has reduced deflection angle significantly.In order to address this problem, the many methods that proposed to respond the drift of resonant frequency and changed driving frequency, comprising can be by detecting deflection angle based on induction electromotive force, change the drift of response resonant frequency and the method (seeing the open No.2001-305471 of Japanese laid-open patent application) of the driving frequency of the exciting current that applies.
Also proposed to change based on temperature compensation many methods of resonant frequency, comprised by using the well heater, temperature sensor and the temperature-control circuit that provide as light deflector to control the method for the resonant frequency of light deflector (the open No.H05-260267 of Japanese laid-open patent application).
Here, the temperature of light deflector is not only changed by environment temperature, and is also changed by the laser according to the view data modulation when deflection comes the laser of self-excitation light source.Changed by environment temperature with the former and to compare, it is to change rapidly that the latter is changed by laser, and its change time estimates to reach tens of milliseconds or still less.Here, under the situation of low-power laser source, its temperature variation is very little and can ignore.But when using high-power laser light source, its temperature variation is very remarkable.In the image processing system that uses this light deflector, the resonant frequency of light deflector changes with its temperature variation, makes image projected worsen.
Time that variation in the oscillatory regime of light stable deflector is required and Q value are proportional.Therefore, when the light deflector of resonance-type has high Q value, estimate stabilization time to reach tens of milliseconds.Even when changing the temperature of light deflector, estimate also can reach tens of milliseconds stabilization time by well heater etc.As mentioned above, since the temperature variation of the light deflector that the modulation of deflection causes with time of the oscillation stability time same order of light deflector on take place.Therefore use above-mentioned conventional art to be difficult to control because the temperature variation of the light deflector that the modulation of deflection causes.
Summary of the invention
Consider the problems referred to above, the invention provides the method that a kind of control comprises the image processing system of light-deflection apparatus, this light-deflection apparatus has: light deflector, and oscillator divides support to vibrate with respect to support substrate by elasticity support sector in this light deflector; Temperature control unit is used to control the temperature of light deflector; At least one light source; And modulating part, be used for modulated light source; Wherein from the light of light source by light deflector deflection, and on to the small part rayed to object to be illuminated to form image, described method comprises: according to from the modulation signal of the modulating part temperature by temperature control unit control light deflector, with the resonant frequency of light stable deflector.
In said method of the present invention, the light source that temperature control unit is preferably such: the light of its emission except the drawing light that is used to form image, with the resonant frequency of light stable deflector; And the total amount of preferably controlling the light from the light emitted to the light deflector makes that this total amount is near predetermined total amount in any unit interval.
In said method of the present invention, described temperature control unit preferably includes and is installed in the heating element that the light deflector temperature was partly gone up, adjusted to light deflector, and preferably controls the resonant frequency of the temperature of light deflector with the light stable deflector by this heating element.
According to the present invention, even in the light-deflection apparatus of use such as the light source of high-power laser light source, the light deflector variation of temperature that causes according to draw data modulation deflection also can compensate by compensating the light emission or compensating to heat.Therefore, can keep good oscillatory regime.Thereby, the method according to this invention, the image that can form by the image processing system of use light-deflection apparatus.
Description of drawings
Fig. 1 is the schematic diagram that is used to explain according to the method for the control image processing system of the first embodiment of the present invention;
Fig. 2 is the curve map that the oscillation track of light deflector in the image processing system is shown;
Fig. 3 is the explanation view that non-drawing area filtrator (filter) in the image processing system is shown;
Fig. 4 is the explanation view of the unit's of illustrating make-up time;
Fig. 5 is the schematic diagram that is used to explain the method for control image processing system according to a second embodiment of the present invention;
Fig. 6 is the explanation view that temperature compensation laser filter in the image processing system is shown;
Fig. 7 is the schematic diagram of method that is used to explain the control image processing system of a third embodiment in accordance with the invention;
Fig. 8 is the schematic diagram of method that is used to explain the control image processing system of a fourth embodiment in accordance with the invention; With
Fig. 9 is the schematic diagram that is used to explain the method for control image processing system according to a fifth embodiment of the invention.
Embodiment
Below, in order to understand the present invention, specific embodiment will be described with reference to the drawings.
Reference numeral in the accompanying drawing at first, below will be described.Reference numeral 1 presentation video forms device; 10, light deflector; 20,21 and 22, light source (lasing light emitter, drawing lasing light emitter and temperature compensation lasing light emitter); 30, control module; 41, drawing area; 42, the drawing time; 43, the non-drawing time; 44, special time (unit make-up time); 51,65 and 72, object to be illuminated (projection surface, photo-sensitive cell and screen); And 60, heating element.
(first embodiment)
Below with reference to accompanying drawing the first embodiment of the present invention is described.Fig. 1 is the structural drawing that is used to explain according to the method for the control image processing system of this embodiment.In this embodiment, light deflector 10 comprises movable platen (or oscillator), support substrate and is used to support the elastic support member of movable platen to twist rotationally with respect to support substrate.The light modulated that light deflector 10 deflections come self-excitation light source 20, lasing light emitter 20 is as carrying out direct Modulated Semiconductor Laser device.Light deflector 10 is driven and control by the driving control unit 31 of control module 30.Lasing light emitter 20 is by 32 modulation of the light source control unit with modulating part and the driving of control module 30.Light source control unit 32 have will be obtained from outside draw data be converted to modulation signal and according to the function in this modulation signal modulation and driving laser source 20, and have and be used to carry out modulation and drive temperature control unit with the resonant frequency of light stable deflector 10.
Drive the movable platen of light deflector 10 so that resonance makes that driving is a sinusoidal drive as shown in Figure 2.In this embodiment, 70% zone corresponding to the peak swing of movable platen is set to drawing area 41.The deflection that forms by forward scan and the reverse scan of using by light deflector 10 in this zone forms image on object to be illuminated.Certainly, image can be only by the two one of form.
Be that drawing time 42 and remaining are the non-drawing time 43 sweep time that is used for drawing area 41.The drawing time 42 accounts for 49.4% of T.T., and the non-drawing time 43 accounts for 50.6% of T.T..In this embodiment, 70% zone corresponding to the peak swing of movable platen is set to drawing area 41.Yet this number percent can be number percent arbitrarily.In this embodiment, as shown in Figure 3, provide non-drawing area filtrator 52 to prevent by not being that the deflection that is used for the light of drawing area 41 arrives the projection surface 51 corresponding to object to be illuminated in the light of light deflector 10 deflections.
In addition, in this embodiment, the resonant frequency that changes the light deflector 10 that causes for the exposure of proofreading and correct the light of modulating according to draw data drifts about half unit's of being set to make-up time 44 of the oscillation period that comprises drawing time 42 and non-drawing time 43 as shown in Figure 4.Carry out control and make that in each of a plurality of unit make-up time 44 general power that is transmitted into the light of light deflector 10 from lasing light emitter 20 is a predetermined power.More particularly, the power of the light that absorbs from lasing light emitter 20 emission and by light deflector 10 in the drawing time 42 changes according to draw data, makes the resonant frequency of light deflector 10 change, thereby makes image degradation.Therefore, even also launch light in non-drawing times 43 inner laser source 20.Thereby, remain on predetermined power consistently in the general power of the light of unit make-up time 44 internal radiation light deflectors 10.
In other words, when the power at the light of the drawing time of unit make-up time 44 42 internal radiation light deflectors 10 is provided by Pce and when the power of the light of non-drawing time 43 internal radiation light deflectors 10 is provided by Ped, represent by Pto=Pce+Ped (expression formula 1) at the power P to of the light of unit make-up time 44 internal radiation light deflectors 10.Power P at the light of unit make-up time 44 internal radiation light deflectors 10 remains on predetermined power during the image processing system work period.Therefore, no matter draw data how, has all been stablized the resonant frequency of light deflector 10, therefore can realize the image that forms.
Power P ce at the light of drawing time 42 internal radiation light deflectors 10 is grasped in advance by light source control unit 32.Therefore, according to this power, the power of the light of emission is determined by above-mentioned expression formula 1 in the non-drawing time 43 after the drawing time 42, and carries out the irradiation of the light with determined power.In this embodiment, each continuous unit make-up time 44 is carried out this irradiation control.Can carry out this control to each discrete (for example replacing) unit make-up time 44.Preceding a kind of control has remarkable effect concerning stablizing resonant frequency.Even in a kind of control in back, the effect of stable resonant frequency is arranged also.
In an embodiment, be made as half of oscillation period of comprising drawing time 42 and non-drawing time 43 the unit make-up time 44.It can be made as any time of the integral multiple that is 1/4 cycle (will be divided into the time under the situation of continuous unit make-up time 44, this is the minimum time that can comprise drawing time 42 and non-drawing time 43 under predetermined speed).
(second embodiment)
Next the second embodiment of the present invention is described with reference to the drawings.Fig. 5 is the structural drawing that is used to explain according to the method for the control image processing system of this embodiment.In Fig. 5, the driving control unit 31 of light deflector 10, drawing lasing light emitter 21 and control module 30 is corresponding with first embodiment's.
In this embodiment, change the resonant frequency drift of the light deflector 10 that causes for the exposure of proofreading and correct the light of modulating according to draw data, the rayed light deflector 10 of self-temperature compensating lasing light emitter 22 (being different from drawing lasing light emitter 21) since the control light deflector makes, and the general power of the light of irradiates light deflector 10 constant in the unit make-up time 44 be predetermined power.
In other words, when the power of the light that absorbs from drawing lasing light emitter 21 emission and by light deflector 10 in the unit make-up time 44 is provided by Pdr, and when the power of the light that absorbs from temperature compensation lasing light emitter 22 emission and by light deflector 10 is provided by Pco, represent by Pto=Pdr+Pco (expression formula 2) at the power P to of the light of unit make-up time 44 internal radiation light deflectors 10.Even in this embodiment, during the work period of power at image processing system of the light of unit make-up time 44 internal radiation light deflectors 10, also remain on predetermined power consistently.Therefore, no matter draw data how, has all been stablized the resonant frequency of light deflector 10, make it possible to achieve and form good image.
In this embodiment, as shown in Figure 6,, make the frequency of drawing lasing light emitter 21 different with the frequency of temperature compensation lasing light emitter 22 for the light that prevents from self-temperature compensating lasing light emitter 22 projects on the projection surface 51.Between light deflector 10 and projection surface 51, insert the temperature compensation laser filter 53 of the light be used to absorb self-temperature compensating lasing light emitter 22.Therefore, in this embodiment, be not limited in the non-drawing time 43 from the 22 radiative times of temperature compensation lasing light emitter, and can be any time in the unit make-up time 44.For example, the unit make-up time 44 can be made as the picture element scan time.Each picture element scan in the time with opposite modulating mode driven drawing lasing light emitter 21 and temperature compensation lasing light emitter 22 (for example, when opening a light source, closing another light source).Thereby, also can remain on predetermined power in the general power of the light of picture element scan time internal radiation light deflector 10.When the frequency of drawing lasing light emitter 21 equals the frequency of temperature compensation lasing light emitter 22, from the 22 radiative times of temperature compensation lasing light emitter must be in the non-drawing time 43.
(the 3rd embodiment)
Next the third embodiment of the present invention is described with reference to the drawings.Fig. 7 is the structural drawing that is used to explain according to the method for the control image processing system of this embodiment.In this embodiment, the driving control unit 31 of light deflector 10, lasing light emitter 20 and control module 30 and first embodiment's is corresponding.Light source control unit 32 only have will be obtained from outside draw data be converted to modulation signal and then according to the function in this modulation signal modulation and driving laser source 20.The temperature control unit 33 of control module 30 is by using the temperature of heating element (temperature control component) 60 according to modulation signal control light deflector 10.
In this embodiment, temperature control component 60 is installed by light deflector 10.More particularly, well heater is installed on the elastic support member of light deflector 10 (for example, welding resistance there).Therefore, the temperature of elastic support member is changed arbitrarily by well heater under the control of the temperature control unit 33 of control module 30.In this embodiment, use well heater to be installed on the elastic support member as temperature control component 60 and with it.Also can use such as the amber ear and paste the temperature control component of (Peltier) element and can be installed in any position of light deflector, such as the position on the movable platen.
In this embodiment, in order to proofread and correct the resonant frequency drift according to the light deflector 10 of draw data, control temperature control component 60 is to proofread and correct the temperature change of the light deflector 10 that is caused by lasing light emitter 20.In other words, when the power of the light that absorbs from lasing light emitter 20 emission and by light deflector 10 in the make-up time in unit is provided by Pdr, and when the magnitude of current that is provided to temperature control component 60 was provided by I, the temperature T of the light deflector 10 that keeps in the make-up time in unit was represented by T=CPdr+DI (expression formula 3).In expression formula 3, C represents that power-temperature conversion factor and D represent electric current-temperature conversion factor.Measure in advance and storage power-temperature conversion factor and electric current-temperature conversion factor in temperature control unit 33.During the work period of temperature T at image processing system of unit light deflector 10 in the make-up time, remain on predetermined temperature consistently.Therefore, no matter draw data how, has all been stablized the resonant frequency of light deflector 10, make it possible to achieve and form good image.Power P dr at the light of drawing time 42 internal radiation light deflectors 10 can be grasped in advance by light source control unit 32.According to this power, temperature control unit 33 is determined to be provided to the electric current of well heater and is carried out determined electric current supply according to expression formula 3.
In above-mentioned each embodiment, the unit make-up time is made as the time fully shorter than the oscillation stability time of light deflector, that is, and 1
μ secThe unit make-up time can be any time shorter than the oscillation stability time of light deflector.
(the 4th embodiment)
Next the fourth embodiment of the present invention is described with reference to the drawings.Fig. 8 is the structural drawing that is used to explain according to the method for the control image processing system of this embodiment.In this embodiment, the control method (described in above-mentioned each embodiment) that is used for image processing system according to the present invention is applied to laser printer (LBP).According to the method that is used to control image processing system in the present embodiment, stablized the resonant frequency of light deflector.Therefore, no matter draw data how, can form good image on photosensitive drums 65.
(the 5th embodiment)
Next the fifth embodiment of the present invention is described with reference to the drawings.Fig. 9 is the structural drawing that is used to explain according to the method for the control image processing system of this embodiment.In this embodiment, the control method that is used for image processing system according to the present invention is applied to projector.Projection is first from the one-dimensional scanning of image processing system 1, and by using vertical light deflector 71 that screen 72 is arrived in its two-dimensional scan.Even in the method that is used for controlling image processing system, also stablized the resonant frequency of light deflector according to this embodiment.Therefore, no matter draw data how, can form good image on screen 72.
The application requires the right of priority of Japanese patent application No.2004-192338 that submitted on June 29th, 2004 and the Japanese patent application No.2005-135499 that submitted on May 9th, 2005, by reference they is included in this.
Claims (8)
1. method of controlling image processing system, this image processing system comprises light-deflection apparatus, this light-deflection apparatus comprises: light deflector, in light deflector oscillator by the elastic support member support to vibrate with respect to support substrate; Temperature control unit is used to control the temperature of light deflector; At least one light source; And modulating part, be used to modulate this light source; Wherein from the light of light source by light deflector deflection, and on to the small part rayed to object to be illuminated to form image, described method comprises:
According to from the modulation signal of modulating part temperature, with the resonant frequency of light stable deflector by temperature control unit control light deflector.
2. according to the method for the control image processing system of claim 1, wherein, the light of described temperature control unit emission except the drawing light that is used to form image is with the resonant frequency of light stable deflector.
3. according to the method for the control image processing system of claim 2, wherein, the total amount that is controlled at the light from the light emitted to the light deflector in the arbitrary unit time makes this total amount near predetermined total amount.
4. according to the method for the control image processing system of claim 3, wherein, the described unit interval comprises the drawing time that is used to form image and does not form the non-drawing time of image, and wherein be controlled at the amount of the light from the light emitted to the light deflector in the non-drawing time, make it near scheduled volume with the total amount of controlling the light from the light emitted to the light deflector in the unit interval according to the amount that in the drawing time, is transmitted into the light of light deflector.
5. according to the method for the control image processing system of claim 3, wherein, the described unit interval is the integral multiple of 1/4 oscillation period of the oscillator in the light deflector.
6. according to the method for the control image processing system of claim 1, wherein, described light source is a single light source.
7. according to the method for the control image processing system of claim 1, wherein, described light source is the light source with a plurality of different wave lengths, and wherein is provided for preventing to arrive from the light outside the drawing light of light source the filtrator of object to be illuminated.
8. according to the method for the control image processing system of claim 1, wherein, described temperature control unit comprises the heating element that is installed on the light deflector part, and wherein controls the resonant frequency of the temperature of light deflector with the light stable deflector by this heating element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP192338/2004 | 2004-06-29 | ||
| JP2004192338 | 2004-06-29 | ||
| JP135499/2005 | 2005-05-09 |
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| Publication Number | Publication Date |
|---|---|
| CN1977207A CN1977207A (en) | 2007-06-06 |
| CN100443947C true CN100443947C (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005800217614A Expired - Fee Related CN100443947C (en) | 2004-06-29 | 2005-06-14 | Method for controlling image-forming apparatus |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598851B (en) * | 2008-06-04 | 2011-02-16 | 一品光学工业股份有限公司 | MEMS scan controller with inherence frequency and control method thereof |
| JP6792188B2 (en) * | 2015-12-25 | 2020-11-25 | 株式会社リコー | Optical scanning device and image display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4317611A (en) * | 1980-05-19 | 1982-03-02 | International Business Machines Corporation | Optical ray deflection apparatus |
| US5247384A (en) * | 1989-11-13 | 1993-09-21 | Fuji Photo Film Co., Ltd. | Method of stabilizing resonant frequency and resonant scanner using the same |
| JPH05260267A (en) * | 1992-03-16 | 1993-10-08 | Fujitsu Ltd | Drive control circuit for scanner mirror driving actuator |
| JP2001305471A (en) * | 2000-04-25 | 2001-10-31 | Nippon Signal Co Ltd:The | Electromagnetic actuator, drive controller and method for electromagnetic actuator, device and method for generating resonance frequency signal of electromagnetic actuator |
| CN1469156A (en) * | 2002-06-07 | 2004-01-21 | 富士写真光机株式会社 | Optical scanning device |
-
2005
- 2005-06-14 CN CNB2005800217614A patent/CN100443947C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4317611A (en) * | 1980-05-19 | 1982-03-02 | International Business Machines Corporation | Optical ray deflection apparatus |
| US5247384A (en) * | 1989-11-13 | 1993-09-21 | Fuji Photo Film Co., Ltd. | Method of stabilizing resonant frequency and resonant scanner using the same |
| JPH05260267A (en) * | 1992-03-16 | 1993-10-08 | Fujitsu Ltd | Drive control circuit for scanner mirror driving actuator |
| JP2001305471A (en) * | 2000-04-25 | 2001-10-31 | Nippon Signal Co Ltd:The | Electromagnetic actuator, drive controller and method for electromagnetic actuator, device and method for generating resonance frequency signal of electromagnetic actuator |
| CN1469156A (en) * | 2002-06-07 | 2004-01-21 | 富士写真光机株式会社 | Optical scanning device |
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Granted publication date: 20081217 Termination date: 20170614 |