JPH11320959A - Fluorescent printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent printer ensuring a high quality print result regardless of the leave-alone characteristics of a phosphor. SOLUTION: The fluorescent printer has a fluorescent print head 60 comprising a plurality of phosphors and exposes a recording medium by emitting light from the phosphors according to an image data. The fluorescent printer is provided with a leave-alone correction table 7d based on the leave-alone characteristics of a phosphor, and a phosphor operation time managing section 7g for determining the leave-alone time of the phosphor wherein emission of the phosphor is corrected depending on the leave-alone time using the leave- alone correction table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent printer having a fluorescent print head composed of a plurality of fluorescent materials, and illuminating the fluorescent materials in accordance with image data to expose a recording medium.

[0002]

2. Description of the Related Art A fluorescent printer for forming an image on a light-sensitive medium is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-92622, a cathode electrode for emitting thermoelectrons, a grid electrode, and a predetermined electrode. A plurality of strip-shaped anode electrodes coated with a phosphor with a pitch and a size are sealed in a vacuum vessel, and a control signal based on image data is applied to a grid electrode to heat the phosphor. Electron collision, that is, light emission of the phosphor is controlled. One phosphor corresponds to one pixel constituting an image, that is, one dot. In order to obtain a high resolution, the arrangement pitch of the phosphors needs to be fine. Are arranged in multiple rows, and by appropriately adjusting the light emission timing of the phosphors in each row with the relative movement in the sub-scanning direction, the dots from the phosphors in the multiple rows are arranged in a straight line in the sub-scanning direction. .

[0003] By supplying a drive signal modulated in accordance with density data based on image information to a fluorescent print head, the fluorescent material emits light with a desired amount of light, and an image having a desired density can be formed on a recording medium. At that time, in order to obtain a high-quality recorded image, it is necessary to form dots of the same density at any time, for example, at any dot position in the sub-scanning direction for the same density data input. is there.

[0004]

However, if the phosphor is left without emitting light for a long time, the amount of re-emission after leaving the phosphor decreases compared to the standard light emission, and the light emission of the phosphor decreases with time. Since the fluorescent print head that has not been driven for a long time is driven, a density gradient is generated in the sub-scanning direction even if the density data is the same when driven by a fluorescent print head that has not been driven for a long time because it has a leaving characteristic that gradually recovers. In order to explain this, FIG. 9 shows the temperature fluctuation of the phosphor and the dots formed on the recording medium in the sub-scanning direction when the phosphor is continuously driven after being left without emitting light for a long time. The concentration distribution is shown schematically.

[0005] This leaving property of the phosphor is a phenomenon that is considered to be based on the behavior of trace residual elements (such as gaseous) confined in the vacuum chamber of the phosphor element due to force majeure in element production. For the generation mechanism, for example, the following inference is established. That is, while the light emission of the print head continues without being left for a long time, the temperature of the phosphor itself is maintained at a certain high temperature. The abundance of the elements becomes uniform in the vacuum chamber, the abundance on the surface of the phosphor is extremely low, and the movement of thermoelectrons jumping toward the phosphor is not prevented, so that normal light emission can be obtained.
On the other hand, the print head is long (for example, 30 minutes)
If the phosphor element is left without emitting light, the temperature of the phosphor element itself decreases (for example, approaches room temperature), so that residual elements in the vacuum chamber are deposited on various parts including the surface of the phosphor. The residual elements prevent thermions emitted from the cathode from colliding with the phosphor, and as a result, the luminous ability of the phosphor decreases until the temperature increases.
SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent printer capable of obtaining a high-quality print result despite the above-mentioned leaving characteristics of a phosphor.

[0006]

In order to achieve the above object, there is provided a fluorescent print head comprising a plurality of phosphors,
In a fluorescent printer that emits light from the phosphor according to image data and exposes a recording medium, in the present invention, a leaving correction table created from the leaving characteristics of the phosphor and a phosphor operation for determining a leaving time of the phosphor are provided. A time management unit, wherein the light emission amount of the phosphor is corrected using the leaving correction table according to the leaving time.

In this configuration, the image (density) data transmitted is compensated for, in consideration of the above-mentioned leaving characteristics of the fluorescent substance of the fluorescent print head, so as to compensate for the shortage of the amount of light generated in the light emission after leaving for a predetermined time. Correction using the neglected correction table to extend the lighting time of the phosphor. Thereby, it is possible to reduce exposure unevenness due to the leaving characteristic of the phosphor.

In one preferred embodiment of the present invention, the leaving correction table is configured to calculate a ratio of a light emission amount of re-emission after leaving to a reference light emission amount over a predetermined period of time from a correction value. In this case, the amount of increase in the light amount of the phosphor is determined in accordance with the degree to which the light amount of the phosphor gradually recovers by re-emission after standing, so that the previously measured leaving Correction substantially corresponding to the characteristic curve can be performed.

In general, a fluorescent print head forms dots having different densities on a recording medium by receiving a drive signal having a variable time width, and performs gradation expression. For this reason, in one of the preferred embodiments of the present invention, the correction of the phosphor emission amount is performed by setting the pulse width of the phosphor drive signal supplied to the fluorescent print head to the elapsed time from the re-emission after being left. Is made longer based on the correction value selected in accordance with the above. The technical content of changing the pulse width of this drive signal includes, for example, changing the number of basic pulse signals having a constant pulse width to change the pulse width of the final drive signal and consequently the lighting time of the phosphor. The technology to do it is also included.

The correction of the leaving characteristics of the phosphors is performed by dividing the phosphors provided in the fluorescent print head into groups and giving correction values to the respective groups, and the phosphors in the same group use the same correction values. Although improvement in quality can be expected, in consideration of the fact that each phosphor has a slightly different leaving characteristic, in a preferred embodiment of the present invention, a correction value of the leaving correction table is prepared for each phosphor, It is possible to be corrected individually. As a result, all the dots by the fluorescent print head are accurately corrected for the leaving characteristic.

Further, in one preferred embodiment of the present invention, the phosphor operating time management section includes a leaving time calculating section for calculating a leaving time of the phosphor, and a process after re-emission after leaving the phosphor. And an elapsed time calculator for calculating time.
In the leaving characteristic curve shown in FIG. 9, the degree of initial light quantity decrease slightly varies depending on the time from the previous light emission to the next light emission. By determining the correction value using the two elapsed times of the elapsed time for calculating the elapsed time from the post-re-emission as a parameter, more accurate leaving characteristic correction can be achieved.
Other features and advantages according to the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0012]

FIG. 1 is a schematic sectional view of a fluorescent print head 60. FIG. Fluorescent print head 6
0 actually has three light-emitting blocks of R (red), G (green), and B (blue), but here only the light-emitting block of R is shown. The other two light-emitting blocks have the same configuration.

On the inner surface of a substrate 61 made of a translucent material,
A first strip-shaped anode electrode 62 and a second strip-shaped anode electrode 63 made of an aluminum thin film are formed. As can be clearly understood from FIG. 2, the two strip-shaped anode electrodes 62 and 63 are at right angles to the transport direction of the photographic paper (hereinafter simply referred to as photographic paper) 3 exposed by the fluorescent print head 60. Extending in the scanning direction, rectangular transmission holes 62a and 63a are provided at a predetermined pitch. Transmission hole 62a of first belt-shaped anode electrode 62
The transmission holes 63a of the second strip-shaped anode electrode 63 are arranged in a staggered manner.

Each of the transmission holes 62a and 63a has a phosphor 64
Is coated, and spaced from the phosphor 64,
A plurality of grid electrodes 65 corresponding to the phosphors 64 extend in a direction transverse to the main scanning direction. In the grid electrode 65, a slit hole 65a as a light transmitting portion is formed in an area facing the phosphor 64. Each grid electrode 65 is electrically independent of each other, and an independent control voltage is applied to each grid electrode 65. An acceleration electrode 66 is provided further away from the grid electrode 65. The acceleration electrode 66 is made of a single metal plate provided with slit holes 66a corresponding to the slit holes 65a of the grid electrode 65, and a common acceleration voltage is applied. Further, a linear cathode electrode 67 as a filament is provided at a position away from the grid electrode 65 along the main scanning direction. The phosphor 64, the first strip-shaped anode electrode 62 or the second strip-shaped anode electrode 63, the grid electrode 6, and the accelerating electrode 66 constitute each light emitting element, and light emitted by each light emitting element emits light. A one-dot latent image is formed on the printing paper 3.

As described above, the strip-shaped anode electrodes 62 and 6
3, grid electrode 65, acceleration electrode 66, cathode electrode 6
Reference numeral 7 is housed in a vacuum space created by the inner surface of the substrate 61 and the cover body 68. On the outer surface of the substrate 61,
A red filter 69 as a color filter is provided to face the phosphor 64. The light beam 70 emitted from the phosphor 64 is modulated by the red filter 69 and is imaged on the photographic paper 3 by the selfoc lens 71.

While a predetermined voltage is applied to the cathode electrode 67 and the accelerating electrode 66, a voltage is alternately applied to the first band-shaped anode electrode 62 and the second band-shaped anode electrode 63 at a predetermined timing, and in synchronization with this timing. By applying a positive exposure signal to the desired grid electrode 65, the thermoelectrons jumping from the cathode electrode 67 pass through the slit holes 65 a according to the state of the grid electrode 65 and collide with the phosphor 64. The phosphor 64 hit by the thermal electrons emits light, and the light beam 70 passes through the transmission hole and reaches the photographic paper 3, so that the photographic paper 3 is exposed in light beam dot units.

For example, when all the phosphors 64 emit light, the photographic paper 3 is exposed in a straight line with one dot width by two rows of light emitting elements. By performing such line exposure on the photographic paper 3 while moving the print head 60 in the sub-scanning direction, a latent image corresponding to an image to be printed is formed in the print area of the photographic paper 3. . At this time, the light emission characteristics of each light emitting element are determined by unevenness in exposure due to variations in the light emission characteristics of the phosphor 64 itself, the light emission area of the phosphor 64, the distance between the electrodes, and the like (the light emission operation is performed based on the same density data. The time width of the drive signal applied to the grid electrode 65 is adjusted in order to compensate for the fact that the light amounts of the respective light emitting elements are not the same. This should eliminate the exposure unevenness caused by the light emitting element. However, when the print head 60 is not driven continuously, the above-described leaving property of the phosphor 64 in the sub-scanning direction causes It is known that the light emission amount of the same phosphor 64 varies from the start of exposure to the end of exposure.

Therefore, in the fluorescent printer according to the present invention, the print head 60 is driven with the same density data after leaving the print head 60 undriven for a long time, and the photographic paper 3 is exposed while being moved in the sub-scanning direction. The dots of each of the phosphors 64 obtained by the measurement are measured, and a correction value for compensating the leaving characteristic (the degree of dip in the amount of light) of each of the phosphors 64 is created from the obtained measured values (see FIG. 9) for a predetermined time. When the print head 60 is driven after being left, this correction value is used to compensate for the drop in the amount of light based on the left characteristics for each phosphor.

FIG. 3 shows an example of a leaving correction table including correction values for compensating for the leaving characteristics. In this case, the vertical axis indicates all the light emitting elements constituting the print head 60. Is assigned to the horizontal axis item, the elapsed time from the re-drive (light emission operation) after the print head 60 is left, that is, the time (movement) point in the sub-scanning direction. For example, the luminous element No. at the first exposure point when the print head 60 is driven again after a lapse of a lapse time in which the lapse characteristics must be considered. No. 1 is about 75% of the optimum light amount in continuous operation light emission in the re-emission after standing, so the light-emitting element No. 1 The correction value of 1 is 1.3, and the lighting time calculated from the actual density data is extended by 1.3 times. Similarly, the light emitting element No. The lighting time of No. 2 is 1.4 times longer than the lighting time calculated from the actual density data. In order to form a dot in the next sub-scanning direction, the correction value of the movement (time) point 2 is used, and the correction values of the adjacent columns are used one after another with the sub-scanning.

In this embodiment, the density data is 8 bits.
The gradation signal is represented by (256), and a control signal having a time width for obtaining a desired density is supplied to the grid electrode 65 by supplying the reference pulse by the value. For example, when the gradation value is low, the printing paper 3 is hardly exposed and the dot remains almost white. When the gradation value is large, the printing paper 3 is exposed for a long time and becomes a dark dot. At a time point having a large correction value, the corrected value may exceed 256, but these values are assumed to be 256. This is because a value close to 256 is not visually recognized as a very large difference. Particularly important in photographic prints and the like is accurate correction in the intermediate gradation region, and accurate leaving characteristic correction in the intermediate gradation region can be achieved by the above-described correction method. In the example of FIG.
o. If the density data for No. 1 is 100, the result of the correction is 130. Actually, the light emitting element No. has a time width of 130 reference pulses. 1 is turned on, and the light emitting element No. 1 is turned on. 2
If the density data is 150, the correction result 21
0, and the light-emitting element No. in a time width of 210 reference pulses actually. 2 lights up. Such correction is performed at all the exposure points in the sub-scanning direction, and the neglected correction for each light emitting element over the entire print area is performed.

Hereinafter, the fluorescent print head 6 according to the present invention will be described.
A description will be given of a printer processor that employs a fluorescent printer 0 as a fluorescent printer. As is apparent from the schematic block diagram shown in FIG. 4, the printer processor has an optical exposure device 20 for projecting and exposing an image of the photographic film 2 to a photographic paper 3 as a photosensitive material at an exposure point 1.
A fluorescent printer 30 as a digital exposure device for exposing an image on the photographic paper 3 at the same exposure point 1 in accordance with digital image data; a developing processing unit 5 for developing the photographic paper 3 exposed at the exposure point 1; A photographic paper transport mechanism 6 for transporting the paper 3 from the photographic paper magazine 4 via the exposure point 1 to the development processing unit 5 and a controller 7 for controlling each part of the printer processor 1 are provided. The exposure point 1 is provided with a paper mask 40 for determining the exposure area of the photographic paper 3 by the optical exposure device 20. The controller 7 has a console 8 for inputting various information and a monitor 9 for displaying images and characters. Is connected. The sub-controller 107 communicably connected to the controller 7 performs an auxiliary function of the controller 7.

The photographic paper 3 pulled out from the photographic paper magazine 4 containing the photographic paper 3 in a roll shape is exposed by the optical exposure device 20 or the fluorescent printer 30 or both exposure devices. , And is cut into a size including one frame of image information and discharged. of course,
A configuration in which the printing paper 3 is cut to a required length before exposure may be employed. Hereinafter, each component will be described.

The optical exposure device 20 includes an optical exposure light source 21 composed of a halogen lamp, a light control filter 22 for adjusting the color balance of light applied to the film 2, and a light passing through the light control filter 22. A mirror tunnel 23 for mixing colors, a printing lens 24 for forming an image of the film 2 on the photographic paper 3, and a shutter 25 are provided on the same optical axis forming an exposure optical path.

A scanner 10 for reading an image formed on the film 2 is provided upstream of the optical exposure device 20 on the film transport path. This scanner 10
Irradiates the film 2 with white light, decomposes the intensity of the reflected light or transmitted light into the three primary colors of red, green, and blue, and measures the image density with, for example, a CCD line sensor or a CCD image sensor. Is what you do. The image information read by the scanner 10 is sent to the controller 7 and used to display a simulated image of an image formed on the exposed photographic paper 3 on the monitor 9.

As shown in detail in FIG. 5, the fluorescent printer 30 includes an R light emitting block 32, a G light emitting block 33, and a B light emitting block 3 having the above-described structure.
And a reciprocating mechanism 50 for scanning the fluorescent print head 60 in the transport direction of the printing paper 3. Each light-emitting block of the fluorescent print head 60 is connected to the controller 7, and the driving system of the reciprocating mechanism 50 is a sub-controller 10
7 is connected. Phosphor 64 by controller 7
The image data and the character data are transferred to the photographic paper 3 based on the scanning control of the fluorescent print head 60 in the sub-scanning direction by the sub-controller 107 via the reciprocating movement mechanism 50 and
Color exposure.

The paper mask 40 itself is a known one, and detailed description thereof is omitted. As shown schematically in FIGS. 6 and 7, the paper mask 40 extends in parallel to the transport direction of the photographic paper 3 and is transported. The upper side member 41 and the lower side member 42 which can reciprocate in the transverse direction, the left side member 43 and the right side member 44 which extend in the transverse direction of the transport direction of the printing paper 3 and can reciprocate in the transport direction. A supporting base 45 is provided, and the exposure range in the width direction of the printing paper 3 is changed by the distance between the upper side member 41 and the lower side member 42.
The exposure range in the length direction of the printing paper 3 is determined by the distance between the right side member 44 and the right side member 44. Upper side member 41, lower side member 42,
The movement of the left side member 43 and the right side member 44 is controlled by the controller 7 via a drive mechanism (not shown).

The reciprocating mechanism 50 for the fluorescent print head 60 is attached to the base 45 of the paper mask 40, and its basic components are guides provided at both ends of the fluorescent print head 60. A member 51, a guide rail 52 inserted into a guide hole 51a provided in the guide member 51, a wire fastener 53 provided in one guide member 51, a wire 54 having an end fixed to the wire fastener 53, a wire A sprocket 55 which is wound around 54 and arranged at both ends of the base 45;
A pulse motor 56 rotates one of the sprockets 55 under the control of the sub-controller 107. The rotation of the pulse motor 56 moves the fluorescent print head 60 along the guide rail 52 through the movement of the wire 54.

FIG. 8 is a block diagram schematically illustrating exposure control of the printing paper 3 by the fluorescent print head 60. The controller 7 includes an image data input port 7a connected to a device for acquiring digital images such as a digital camera, a scanner, and a CD. The controller 7 performs image processing on input image data and bitized character data in dot units. An image processing unit 7b for generating density data divided into 256 steps (8 bits), a printer control unit 7c for setting driving conditions of the fluorescent print head 60,
The above-mentioned values (see FIG. 3) are stored so as to be accessible from the printer control unit 7c, and a leaving correction table 7d composed of a memory device such as an EEPROM, and a fluorescent light for determining the leaving time of the phosphor 64 of the print head 60 are provided. A body movement time management unit 7g is provided. The printer control unit 7c includes a cathode control unit 9 that controls a cathode voltage.
1 and a grid control unit 92 for controlling the grid voltage, and an anode control unit 93 for controlling the anode voltage.
The phosphor operating time management unit 7g includes a leaving time calculating unit 94 for calculating a leaving time of the phosphor and an elapsed time calculating unit 95 for calculating an elapsed time from re-emission after leaving the phosphor. As the elapsed time calculated by the elapsed time calculation unit,
Since the sub-scanning is performed at a constant speed, a moving point in the sub-scanning direction, that is, an ordinal number indicating the number of a dot from the first dot in the sub-scanning direction may be used.

If there is a request for exposure using the print head 60, the printer control unit 7c
, And receives the idle time from the end of the previous operation of the print head 60. If the leaving time exceeds a predetermined time, for example, 30 minutes as a preset threshold value, the leaving characteristic of the phosphor 64 becomes remarkable,
The driving time of each light emitting element is corrected using the idle correction table 7d. In the correction processing, a correction value is read out from the neglected correction table 7d using the luminous element to be driven to emit light and the elapsed time (or elapsed point) of the movement in the sub-scanning direction given by the elapsed time calculation unit 95 as address data. The correction value is used to correct the transmitted density (image) data for the light emitting element to be driven to emit light, and the grid control unit 92 sends the corrected value to the print head driver 7e. The data of each color corrected in this way and sent to the print head driver 7e is converted into a drive pulse width there, and the R light emission block 32, the G light emission block 33,
It is sent to the B light emission block 34.

When the print head 60 is substantially continuously operated and its leaving time is significantly shorter than the above-mentioned threshold value, it is not necessary to consider the leaving characteristics of the phosphor 64, so that the print head 60 is sent. The density (image) data is sent to the print head driver 7e without being corrected.

If the idle time is between a few minutes and 30 minutes and the idle characteristics are not so remarkable but cannot be ignored, the correction is made after reducing the correction value obtained from the idle correction table 7d by the method described above. Thus, a weak leaving correction may be performed. In such a neglected correction, the weight is defined by a function that uses the neglect time as a parameter.
This weight may be multiplied by each correction value. In the above example, this weight function is a function whose weight becomes 1 when the idle time exceeds 30 minutes, and becomes smaller as the idle time becomes shorter than that, and may be obtained experimentally in advance.

Further, the controller 7 is provided with a communication port 7f connected to the communication port 107a of the sub-controller 107. The sub-controller 107 includes a scanning control unit 107b that generates a control signal related to the scanning speed and timing of the fluorescent print head 60. The sub-controller 107 cooperates with the controller 7 to output the output port 107c and the motor driver 107.
A control signal is sent to the pulse motor 56 via d. By the cooperation of the controller 7 and the sub-controller 107,
Image printing by the fluorescent print head 60 is performed on a predetermined position of the printing paper 3.

Next, a schematic operation of the printer processor will be described. When the film 2 is supplied to the optical exposure device 20 by the roller 11 driven by the motor 12, the controller 7 controls the light control filter 22 based on image information of the film 2 read by the scanner 10. Thereby, the irradiation light of the light source 21 is
Adjust the color balance according to the color density of the image. The optical exposure device 20 irradiates the film 2 with the adjusted light, irradiates the image information of the film 2 as transmitted light to the photographic paper 3 located at the exposure point 1, and prints the image of the film 2 on the photographic paper 3. . If necessary, the optical exposure device 20
By the scanning of the fluorescent print head 60 of the fluorescent printer 30 on the periphery of the printing area, additional illustrations such as characters and logos are printed. Of course, when printing an image captured by a digital camera on the photographic paper 3, only the fluorescent printer 30 prints on the photographic paper 3 located at the exposure point 1.

The printing paper 3 on which the image has been printed at the exposure point 1 is subjected to a developing process by a printing paper transport mechanism 6 having a plurality of rollers 13 and a motor 14 controlled by a controller 7 for driving these rollers 13. The printing paper 3 is conveyed to the unit 5 and is sequentially developed through a plurality of tanks filled with a processing liquid for developing the photographic printing paper 3 so as to be developed. The photographic paper transport mechanism 6 also functions to stop the photographic paper 3 pulled out from the photographic paper magazine 4 at a predetermined position of the exposure point 1, so that the exposed photographic paper 3 is continuously developed. In the case of adopting the method of transporting the paper to the processing section 5, the photographic paper transport mechanism 6 may be divided on the upstream side and the downstream side in the transport direction from the exposure point 1, and may be independently driven.

In the above embodiment, since the fluorescent print head 60 exposes the photographic paper 3 over a predetermined area,
The configuration in which the fluorescent print head 60 moves on the photographic paper 3 has been adopted.
It is also possible to adopt a configuration in which 0 is fixed at a predetermined position of the exposure point 1 and the photographic printing paper 3 is moved to expose and scan only a predetermined area. In this case, the printing paper 3 may be moved by operating the printing paper transport mechanism 6 based on a control signal from the controller 7.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a print head of a fluorescent printer according to the present invention.

FIG. 2 is an enlarged plan view as viewed from an arrow A in FIG. 1;

FIG. 3 is an explanatory diagram for explaining a leaving correction table for storing correction data for each light emitting element for each movement (time) point in the sub-scanning direction.

FIG. 4 is a schematic block diagram of a printer processor employing the fluorescent printer according to the present invention.

FIG. 5 is a schematic perspective view of a print head portion.

FIG. 6 is a schematic plan view showing a paper mask and a print head reciprocating mechanism.

FIG. 7 is a schematic side view showing a paper mask and a reciprocating mechanism for a print head.

FIG. 8 is a functional block diagram schematically illustrating light emission control of the fluorescent printer.

FIG. 9 is a graph showing the density of dots formed along a sub-scanning direction by one phosphor during a re-emission operation after being left.

[Explanation of symbols]

 7c Printer control unit 7d Leaving correction table 7e Printer driver 7g Phosphor operation time management unit 60 Print head 62 First band-shaped anode electrode 62a Transmission hole 63 Second band-shaped anode electrode 64 Phosphor 65 Grid electrode 66 Acceleration electrode 67 Cathode electrode 69 Color Filter 71 Selfoc lens 91 Cathode control unit 92 Grid control unit 93 Anode control unit 94 Idle time calculation unit 95 Elapsed time calculation unit

Claims (5)

[Claims] A fluorescent printer, comprising: a fluorescent print head comprising a plurality of fluorescent materials, wherein the fluorescent material emits light in accordance with image data to expose a recording medium; and a leaving correction table created from the leaving characteristics of the fluorescent materials. When,
A fluorescent printer, comprising: a phosphor operating time management unit that determines a leaving time of the phosphor, wherein a light emission amount of the phosphor is corrected using the leaving correction table according to the leaving time. 2. The apparatus according to claim 1, wherein said idle correction table comprises a correction value obtained by obtaining a ratio of a light emission amount of re-emission after leaving to a reference light emission amount over a predetermined time. Item 7. The fluorescent printer according to Item 1. 3. The correction of the phosphor emission amount is performed based on the correction value selected according to the elapsed time from re-emission after leaving the pulse width of the phosphor drive signal supplied to the fluorescent print head. 3. The fluorescent printer according to claim 2, wherein the change is performed by changing. 4. The fluorescent printer according to claim 2, wherein a correction value of the neglected correction table is prepared for each phosphor. 5. The phosphor operating time management section includes a leaving time calculating section for calculating a leaving time of the phosphor, and an elapsed time calculating section for calculating an elapsed time from re-emission after leaving the phosphor. The fluorescent printer according to any one of claims 2 to 4, wherein: