JP2002361932A - Method for driving solid scanning type optical writing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for driving a solid scanning type optical writing device comprising an optical shutter element made of a material exhibiting electrooptic effect in which unbalance of color can be avoided even after long time driving by preventing variation in the quantity of transmitted light among a plurality of colors. SOLUTION: Lights of R, G and B are projected being sequentially selected to a large number of optical shutter elements made of PLZT and driving voltages are applied between a discrete electrode and a common electrode provided in each shutter element based on image data. The driving voltages Vr1, Vg1 and Vb1 are lower than the half wavelength voltage at the initial stage of driving corresponding to the lights of R, G and B where the quantity of transmitted light exhibits similar aging characteristics among respective colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a solid-state scanning optical writing device, and more particularly, to a method for driving an apparatus for writing an image on a photosensitive recording medium using an electro-optical material such as PLZT as an optical shutter element. About the method.

[0002]

2. Description of the Related Art Heretofore, when printing an image (latent image) on a photographic paper or film or a photoconductor for electrophotography using a silver halide photosensitive material, PLZT or L which is a material having an electro-optical effect has been used.
A plurality of iNbO ₃ optical shutter elements are juxtaposed in the main scanning direction to control light on / off one pixel at a time, and to expose a photoconductor moving in the sub scanning direction to form a solid which forms a two-dimensional image. Various scanning optical writing devices have been proposed.

In this type of solid-state scanning optical writing device,
By applying a voltage to the optical shutter element made of PLZT, PLZT generates birefringence, and light incident on the element through a polarizer arranged at the front stage is emitted from an analyzer arranged at the latter stage. At this time, the polarizer and the analyzer are arranged in crossed Nicols, and are arranged such that each polarization plane is at 45 ° with respect to the direction of the electric field applied to the optical shutter element.

To write a full-color image,
The light of the three primary colors, R, G, and B, is sequentially switched at a high speed to irradiate the light shutter element, and a one-line image is divided into R, G, and B light on the photoconductor and exposed.

[0005]

However, the conventional optical writing device has a problem that the amount of transmitted light fluctuates when the optical shutter element is repeatedly driven by applying an electric field in a predetermined direction to the optical shutter element. . That is, PLZ
It has been confirmed that when a chip made of a material such as T is irradiated with light and an electric field in one direction is applied to continuously drive the chip, a hysteresis phenomenon occurs in which the amount of transmitted light decreases or increases as the driving time increases.

[0006] As described above, when the transmitted light amount of the optical shutter element fluctuates due to the hysteresis phenomenon, the light amount for exposing the optical recording medium fluctuates. As a result, the image density fluctuates and the image quality deteriorates. A point occurs. Further, in the full-color compatible type, if the variation characteristics of the transmitted light amount due to the hysteresis phenomenon are different for each of R light, G light, and B light, for example, when R light increases and G light and B light decrease, R light
There is a problem that the light becomes strong, the color balance is lost, and the color tone of the image changes.

Accordingly, an object of the present invention is to provide a method of driving a solid-scanning optical writing apparatus capable of minimizing fluctuations in the amount of transmitted light for each of a plurality of colors and avoiding a loss of color balance even when driven for a long time. To provide.

[0008]

In order to achieve the above objects, a driving method according to the present invention comprises a light source for emitting light of a plurality of different colors and a plurality of optical shutter elements made of a material having an electro-optical effect. In the driving method of the solid-state scanning optical writing device comprising an optical shutter module including, the voltage is lower than the half-wave voltage at the time of the initial drive corresponding to the light of each color emitted from the light source unit, A voltage is applied to the optical shutter element, the voltage having a characteristic that the change with time of the transmission amount of light of each color is approximated.

In the driving method described above, by applying a voltage lower than the half-wavelength voltage at the time of initial driving to the optical shutter element, the fluctuation width of the transmitted light amount due to long-time driving can be suppressed. Then, by applying to the optical shutter element a voltage having a characteristic in which the temporal change of the transmission amount of the light of each color is approximated, the variation characteristic of the transmitted light amount due to the temporal change substantially matches. With this, even when driven for a long time, the balance of the transmitted light amount of each color is maintained, and the color balance can be prevented from being destroyed. As a result, a high-quality image can be continuously formed for a long time. it can.

In the driving method according to the present invention, the voltage applied to the optical shutter element may be a voltage which is reduced at substantially the same ratio as the half-wave voltage at the initial driving for each color light, or The voltage may be a voltage in which the inclination of the transmitted light amount characteristic of each color light with respect to the half wavelength voltage at the time is substantially equal, or may be a voltage in which the transmitted light amount of each color light at the beginning of driving is substantially equal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for driving a solid-state scanning optical writing device according to the present invention will be described below with reference to the accompanying drawings.

(First Example of Solid-State Scanning Optical Writing Apparatus) First, FIG. 1 shows the entire configuration of a first example of a solid-state scanning optical writing apparatus in which a driving method according to the present invention is implemented. The optical writing head 100 includes a light source (halogen lamp) 1, a heat-insulating filter 2, a color filter 3, an optical fiber array 4, a polarizer 5, an optical shutter module 6, an analyzer 7, an imaging lens And an array 8.

The color filter 3 has three primary colors of light, R,
This is a disk-shaped rotator having three filter portions for transmitting G and B, and is driven to rotate in synchronization with writing of one line by an optical shutter element described below. The optical fiber array 4 is a bundle of a large number of optical fibers alone, and the light emitted from the light source 1 irradiates the incident end 4a via the heat insulating filter 2 and exits straight from the other end 4b.
The polarizer 5 and the analyzer 7 are arranged in crossed Nicols, and
They are arranged so that each polarization plane is at 45 ° to the direction of the electric field applied to the optical shutter element.

The optical shutter module 6 includes a ceramic or glass substrate 11 having a slit-shaped opening.
A plurality of optical shutter chips 12 made of PLZT and a drive circuit 13 are arranged on top of each other.
In 2, a number of optical shutter elements corresponding to one pixel are formed. As shown in FIG. 5, the light shutter element 41
The elements 41 are arranged in a row, and the elements 41 are formed in a staggered manner by one pixel, and two rows form an image of one line in the main scanning direction.

As is well known, PLZT is a translucent ceramic having a large Kerr constant and having an electro-optic effect, and the light linearly polarized by the polarizer 5 is a voltage applied to the optical shutter element 41. When turned on, the polarization plane is rotated, and the light is emitted from the analyzer 7. When the voltage is off, the polarization plane does not rotate, and such transmitted light is cut by the analyzer 7.

That is, the on / off of the transmitted light occurs when the voltage to each optical shutter element 41 is turned on / off, and the light emitted from the analyzer 7 passes through the imaging lens array 8 onto a photosensitive material (not shown). Form an image. The optical shutter element 41 is turned on / off line by line based on image data (main scanning), and the main scanning and the movement of the photoconductor in one direction (sub scanning).
Thus, a two-dimensional image is formed on the photoconductor.

(Fluctuation of transmitted light amount and determination of drive voltage) In the optical shutter element 41, the relationship between incident light and outgoing light is expressed by the following equation (1).

I ₀ / I _i = sin ² (−π · n ² · R · L · E ² / 2λ) (1) I ₀ : outgoing light amount I _i : incoming light amount n: refractive index of PLZT R: car Constant L: optical path length E: electric field intensity λ: light wavelength

As is apparent from the above equation (1), PLZ
The optical shutter element composed of T is for each color (wavelength) of R, G, and B
The characteristics of the amount of transmitted light are different from one another. FIG. 2 is a graph showing the relationship between the voltage applied to the optical shutter element and the amount of transmitted light. The relationship between the applied voltage and the amount of transmitted light is given by the above equation (1), and curves different in phase depending on the wavelength of the incident light.

The amount of transmitted light is maximized when the phase difference between the component parallel to the electric field of the linearly polarized light transmitted through the optical shutter element and the component orthogonal to the electric field is (2n + 1) / 2 times the wavelength (n is an integer). It is. For example, the voltage at the time when the applied voltage is increased from 0 V and the maximum amount of transmitted light is obtained for the first time is referred to as a half-wavelength voltage. Normally, when light is turned on and off by an optical shutter element, control is performed to determine whether or not to apply this half-wavelength voltage.

Here, the half-wave voltages of R, G, and B are set to Vr, Vg, and Vb, respectively, as shown in FIG. This half-wave voltage means that there are a number of optical shutter elements in an optical shutter module, and the half-wave voltage may vary slightly for each element. Of the half-wave voltage. However, the value is not necessarily an average value, but may be an arbitrary or specific half-wave voltage of one or more optical shutter elements.

FIG. 3 is a graph showing the relationship between the applied voltage and the amount of transmitted light after the initial drive and after the continuous drive in the case of the R light. When an electric field in one direction is continuously applied to the optical shutter element made of PLZT for a long time, the half-wave voltage shifts to a lower voltage side. Therefore, the amount of transmitted light is reduced in spite of driving at the initially set half-wavelength voltage.

In order to suppress such a decrease in the amount of transmitted light over time, it is effective to apply a voltage slightly lower than the half-wavelength voltage to the optical shutter element. For example, FIGS.
As shown in (1), the initial half-wave voltage Vr of the R light is 50 V, but the optical shutter element is driven by applying a lower voltage Vr1.

As shown in FIG. 3, this voltage Vr1 is initially set to a voltage Vr2 (here, 40V assuming that the optical shutter element is driven for 100 hours) at which the half-wavelength voltage of the optical shutter element will be the lowest. Is preferably about halfway with the half-wave voltage Vr, and is set to 45V.

FIG. 4 shows the initial half-wave voltage Vr (5
0 V) and a slightly lower voltage Vr1 (45 V) are applied, and the change in the amount of transmitted light when the optical shutter element is continuously driven is shown. When evaluated over the entire driving period, the amount of transmitted light fluctuates by about 40% when the voltage Vr (50 V) is applied. On the other hand, Vr1 (45
When V) is applied, the amount of transmitted light fluctuates without exceeding 10%. That is, during continuous driving, the voltage V
By applying r1, the fluctuation of the transmitted light amount can be suppressed.

With respect to the G light and the B light, voltages slightly lower than the half wavelength voltages Vg and Vb may be applied. However, if the variation characteristics of the amount of transmitted light differ for each color light, the exposed image not only changes in density, but also
The color tone also changes. Therefore, it is necessary that the drive voltage for the light of each color is a voltage in which the amount of transmitted light shows almost the same fluctuation by continuous driving.

This means that the drive voltage for G light and B light may be determined in the same manner as for R light. That is, the initial half-wave voltage V for the G light and the B light
What is necessary is just to apply an intermediate value between g and Vb and the voltage at which the half-wavelength voltage will be the lowest by continuous driving. These values can be obtained in advance by continuously driving the optical shutter elements with light of each color.

As in the optical writing head 100 shown in FIG. 1, each of the R, G, and B lights is turned on by the same optical shutter element.
In the case of the OFF control, a change in the amount of transmitted light due to continuous driving occurs for light of each color with similar characteristics.
Therefore, it is not necessary to actually continuously drive all the R, G, and B lights to determine the voltage to be applied. The voltage to be applied may be obtained by actually continuously driving only one color, for example, only the R light, to determine the voltage to be applied, and determining the voltage for the other color light based on the voltage value obtained for the R light.

More specifically, for the R light, as described above, Vr1 (45 V) is applied to the initial half-wavelength voltage Vr (50 V).
When V) is obtained, for the G light and the B light, voltage values reduced at the same ratio, that is, Vg × (Vr1 / Vr), V
b × (Vr1 / Vr) may be applied.

Further, the change in the amount of transmitted light due to continuous driving is substantially determined by the PLZT composition. PLZT _{ceramics, (Pb 1-x La x} ) [(Zr y · Ti z)
_{1- (x / 4)} ] O ₃ , the composition of which is represented by the ratio La / Zr / Ti, ie, x / y / z. Suitable PLZT ceramics used as optical shutter elements are:
8.9-9.2 / 65/35. In the PLZT optical shutter element having these compositions, it was found that the half-wave voltage after continuous driving was saturated at about 70% of the half-wave voltage at the initial stage of driving. Further, the optical writing head 100
In practice, continuous driving for a long time is not performed so much for practical use, and the half-wave voltage is at most 90% of the initial half-wave voltage.
It has also been found that it decreases only to the extent.

Therefore, the voltage actually applied is:
For each of R, G, and B light, Vr × (1 + 0.
7) / 2, Vg × (1 + 0.7) / 2, Vb × (1+
0.7) / 2 or more. Usually, Vr × (1
+0.9) / 2, Vg × (1 + 0.9) / 2, Vb ×
A voltage value of about (1 + 0.9) / 2 may be used.

The voltage applied to the optical shutter element is
A voltage at which the inclination of the transmitted light amount characteristic of each color light is almost equal to the half-wavelength voltage at the time of the initial drive (the inclination lines a,
b, c). Alternatively, a voltage (see straight line d in FIG. 2) in which the amounts of transmitted light of the respective colors of light at the initial stage of driving may be substantially equal.

As described above, the voltage applied to the light shutter element for each color of light is a half-wave voltage V
Voltages Vr1, Vg1, Vb1 lower than r, Vg, Vb are applied. To form a full-color image using the optical writing head 100, the voltage applied to the optical shutter element in synchronization with the color switching by the color filter 3 is set to Vr.
1, it is necessary to switch to Vg1 and Vb1.

(Drive Circuit) In order to switch the voltage, there is a method of controlling the voltage applied to the individual electrode or a method of controlling the voltage applied to the common electrode. FIGS. 5 and 6 show drive circuits in the case where the voltages Vr1, Vg1, and Vb1 are switched by controlling the voltage applied to the common electrode.

In the optical shutter module 6, the optical shutter elements 41 are arranged in two rows in a staggered manner, and the driving circuit is a circuit 1 for driving the individual electrodes 43 in each row.
3 and a common electrode drive circuit 35 for driving the common electrode 42.

As shown in FIG. 5, the two circuits 13 for driving the individual electrodes 43 in each column are constituted by a shift register 31, a latch circuit 32, a gate circuit 33, and a high-voltage driver 34, respectively. Each optical shutter element 41
Are connected to the high voltage driver 34, and the common electrode 42 is grounded via the common electrode drive circuit 35. As shown in FIG. 6, the high-voltage driver 34 has two switching elements 45 and 46, and when the element 45 is on, a drive voltage is applied to the individual electrode 43 of the optical shutter element 41. On the other hand, when the element 46 is turned on, the individual electrode 43 of the optical shutter element 41 is grounded.

In FIG. 5, one line of image data is transferred to a shift register 31 in synchronization with a shift clock, and is latched by a latch circuit 32 when a latch signal is turned on. If the inversion signal is off when the gate signal is on, the image data is left as it is in the high voltage driver 3.
4 is transferred to the high voltage driver 34 in an inverted state if the inverted signal is on. High voltage driver 34
Outputs a drive voltage to the individual electrode 43 during non-inversion, and grounds the individual electrode 43 during inversion.

The common electrode drive circuit 35 is constituted by a high-speed / high-voltage amplifier, and amplifies an input drive waveform with a constant gain. Here, the inverted signal is amplified to the same level as the drive voltage and applied to the common electrode 42. In other words, the common electrode drive circuit 35 is connected to the common electrode 42 during non-inversion.
Are grounded, and a driving voltage is output to the common electrode 42 at the time of inversion.

According to the drive circuit having the above configuration, when the inversion signal is off, the common electrode 42 is at the ground potential, and the drive voltage is applied to the individual electrode 43 to turn on the optical shutter element 41. The direction of the electric field at this time is defined as a normal electric field (non-inversion electric field). On the other hand, when the inversion signal is on,
The individual electrode 43 is at the ground potential, and the optical shutter element 41 is turned on by applying a drive voltage to the common electrode 42. The direction of the electric field at this time is referred to as a reverse electric field (reverse electric field).

FIG. 7 is a timing chart showing the above operation. The inversion signal is turned on / off every time one line is printed.
Off is switched. As is well known, in the optical shutter element 41 made of PLZT, a half-wave voltage shifts when a continuous application of an electric field in the same direction causes a fatigue phenomenon. However, by inverting the electric field in a predetermined cycle, the fatigue phenomenon can be prevented. The timing chart of FIG. 7 shows the non-inversion / inversion ratio as 50/50. This ratio is arbitrary, but usually 50
By switching the non-inversion / inversion of the electric field at a ratio of / 50, the shift of the half-wavelength voltage of the optical shutter element 41 can be suppressed to a certain range.

In the driving example shown in FIG. 7, when the electric field is inverted, the inverted signal is amplified and the same voltage as the driving voltage is applied to the common electrode 42. However, an arbitrary voltage can be shared by changing the driving waveform. It can be applied to the electrode 42. In this case, an electric field corresponding to the potential difference between the individual electrode 43 and the common electrode 42 acts on the optical shutter element 41.

The driving method for inverting the electric field in a predetermined cycle is called an electric field inversion method. On the other hand,
It is also possible to set the common electrode 42 side to the ground potential at all times and drive the drive voltage only to the individual electrode 43. Such a driving method is called an electric field one-way method.

(First Driving Method) As shown in FIG. 8, the first driving method is a method in which the voltage applied to the common electrode is changed by an electric field one-way method.

First, the highest voltage Vr among the voltages Vr1, Vg1, Vb1 lower than the half-wave voltage at the initial stage of each of R, G, B is applied to the high voltage driver for driving the individual electrodes.
Set to apply 1. R, G, B for common electrode
0V, Vr1-Vg1, Vr1-
Each voltage of Vb1 is applied.

By driving in this manner, the voltage Vr1 is applied to the optical shutter element when printing with R data, the voltage Vg1 when printing with G data, and the voltage Vg1 when printing with B data. The voltage Vb1 is equivalent to being applied, and voltage switching at high speed is possible.

When there is no image data, voltages of 0 V, Vr1-Vg1, and Vr1-Vb1 are applied to the optical shutter element. However, as apparent from FIGS. 2 and 3, Vr1−Vg1 and Vr1−Vb1
Is about 10 V at the maximum, and the transmitted light amount of the optical shutter element is almost zero, which is not a problem.

(Second Driving Method) As shown in FIG. 9, the second driving method is the one-way electric field method shown in the first driving method, and is applied to a high voltage driver for driving individual electrodes. Is the half-wave voltage V at the beginning of driving B instead of the voltage Vr1.
It was set to apply b1. R, G,
With the switching of B, Vb1-Vr1, Vb1-Vg
Each voltage of 1.0V is applied.

By driving in this manner, the voltage Vr1 is applied to the optical shutter element when printing with R data, the voltage Vg1 is applied when printing with G data, and the voltage is applied when printing with B data. Vb1 is equivalent to being applied, and voltage switching at high speed is possible.

When there is no image data, voltages of Vb1-Vr1, Vb1-Vg1, and 0V are applied to the optical shutter element. However, there is no substantial problem as described in the first driving method.

(Third Driving Method) As shown in FIG. 10, the third driving method is the one-way electric field method shown in the first driving method, and is applied to a high voltage driver for driving individual electrodes. Is set so that a half-wavelength voltage Vg1 at the initial stage of driving of G is applied instead of the voltage Vr1. R for the common electrode,
With the switching between G and B, Vg1−Vr1, 0V, V
Each voltage of g1-Vb1 is applied.

By driving in this manner, the voltage Vr1 is applied to the optical shutter element when printing with R data, the voltage Vg1 when printing with G data, and the voltage Vg1 when printing with B data. The voltage Vb1 is equivalent to being applied, and voltage switching at high speed is possible.

When there is no image data, the voltages Vg1-Vr1, 0V and Vg1-Vb1 are applied to the optical shutter element. However, there is no substantial problem as described in the first driving method.

(Other driving methods) When controlling the voltage applied to the common electrode, the individual electrode is at the ground potential when off, and an electric field corresponding to the voltage applied to the common electrode is generated in the optical shutter element. As described above, since the electric field at this time is sufficiently small, no light is transmitted. However, when this electric field has a bias in one direction and is continuously applied for a long time, the half-wavelength voltage of the optical shutter element also changes. In order to prevent this, it is preferable that a predetermined voltage is applied to the common electrode only during a period during which an image is recorded, and the ground voltage is applied during other periods.

Further, as described above, the voltage applied to the common electrode is switched to a predetermined value in synchronization with the color switching by the color filter. However, when the respective voltage values are combined, the voltage becomes substantially 0V. It is preferable to set as follows. In this case, the average value Vave = (Vr) of the voltage corresponding to R and the voltage corresponding to B is applied to the individual electrode driving circuit 13.
1 + Vb1) / 2, and Vave-Vr1, Vave-Vg1, Vave are applied to the common electrode according to the switching of R, G, and B.
Each voltage of -Vb1 is applied.

As a method of forming a full-color image using the optical writing head 100, as described above, in addition to the method of switching R, G, and B for each line of the image, the method of forming an R , G and B are switched. For example, first, the optical shutter element is driven at the voltage Vr1 by the R light to write one page of the R color image on the recording medium. Next, at the same location on the recording medium where the R color image is written, the G light is used to drive the optical shutter element with the voltage Vg1 to write the G color image for one page. Finally, similarly, the light shutter element is set to the voltage Vb by the B light.
1 to write one page of the B color image on the recording medium.

(Second example of solid-state scanning optical writing device) FIG. 1
FIG. 1 shows the configuration of a second example of a solid-state scanning optical writing device. This apparatus includes an optical writing head 100R for exposing R light and an optical writing head 100R for exposing G light.
An optical writing head 100B for exposing G and B light is provided, and a light source 1 and the like are provided in each head, and color filters 3R, 3G, and 3B are provided. In FIG. 11, the same members as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

In each of the heads 100R, 100G, and 100B, the optical shutter element has a voltage lower than the half-wavelength voltage at the time of the initial drive and is set to the continuous drive in order to suppress a variation in the amount of transmitted light due to the continuous drive. R, G, B by
Is applied, the voltage having a characteristic that the change of the light quantity over time is approximated, that is, a voltage that can maintain the balance of the R, G, and B light quantities.

In the device of the second example, each head 1
The voltages applied to the optical shutter elements of 00R, 100G, and 100B may be constant values of Vr1, Vg1, and Vb1, respectively. These voltages are applied to the individual electrodes, and the common electrode is driven to the ground potential. Then, the driving circuit can be simplified. Of course, FIG.
As described in the sixth and first to third driving methods, a driving method is employed in which a predetermined voltage is applied to the common electrode and a predetermined voltage is applied to the optical shutter element in combination with the voltage applied to the individual electrodes. May be.

(Other Embodiments) The driving method of the solid-state scanning type optical writing apparatus according to the present invention is not limited to the above-described embodiment, but can be variously changed within the scope of the invention.

In the above-described embodiment, R, G, and B are described as control targets, but other colors may be control targets. For example, the three primary colors C, M, and Y may be used, and light of any wavelength can be controlled as long as the plurality of lights have different spectral distributions.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first example of a solid-state scanning optical writing device.

FIG. 2 is a graph showing the relationship between the voltage of a light shutter element and the amount of transmitted light for each of red, green, and blue light.

FIG. 3 is a graph showing a relationship between a voltage and a transmitted light amount (red light) accompanying continuous driving of an optical shutter element.

FIG. 4 is a graph showing a change in the amount of transmitted light due to continuous driving of an optical shutter element for each driving voltage (45 V and 50 V).

FIG. 5 is a block diagram showing a driving circuit of the optical writing device.

FIG. 6 is a block diagram showing a high voltage driver and a common electrode driving circuit in the driving circuit.

FIG. 7 is a timing chart showing the operation of the driving circuit.

FIG. 8 is a timing chart illustrating a first driving method.

FIG. 9 is a timing chart illustrating a second driving method.

FIG. 10 is a timing chart illustrating a third driving method.

FIG. 11 is a perspective view showing a second example of the solid-state scanning optical writing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light source 3 ... Rotary color filter 3R, 3G, 3B ... Fixed color filter 6 ... Optical shutter module 41 ... Optical shutter element 42 ... Common electrode 43 ... Individual electrode

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/34 B41J 3/21 V (72) Inventor Yasuyuki Hiromoto 2-chome Azuchicho, Chuo-ku, Osaka-shi, Osaka No.3-13 Osaka International Building Minolta Co., Ltd. (72) Inventor Yuji Kamoda 2-13-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka F-term in Osaka International Building Minolta Co., Ltd. 2C162 AE10 AE12 AE23 AE47 AF20 AF70 FA08 FA09 FA10 FA36 2H079 AA02 AA12 BA01 CA21 DA04 FA02 FA03 HA23 KA05 KA13 2H106 AA22 AA76 AB71 2H110 AB09 CE12 5C080 AA12 BB03 CC05 DD03 EE29 FF08 GG02 JJ02 JJ04 JJ05 JJ06

Claims (4)

[Claims] A light source that emits light of a plurality of different colors;
A driving method for a solid-state scanning optical writing device comprising: an optical shutter module including a plurality of optical shutter elements made of a material having an electro-optical effect; a driving initial corresponding to light of each color emitted from the light source unit; Applying to the optical shutter element a voltage that is lower than the half-wave voltage at the time, and has a characteristic in which the temporal change in the amount of transmission of light of each color is approximated. 2. A voltage applied to the optical shutter element is:
2. A voltage which is reduced at substantially the same ratio from a half-wave voltage at the time of initial driving of light of each color.
The driving method described. 3. The voltage applied to the optical shutter element is:
2. The driving method according to claim 1, wherein the gradient of the transmitted light amount characteristic of each color light with respect to the half-wave voltage at the beginning of driving is substantially equal. 4. A voltage applied to the optical shutter element is:
2. The driving method according to claim 1, wherein the transmitted light amounts of the respective colors of light in the initial stage of driving are substantially equal.