WO2020189701A1 - Dispositif d'enregistrement laser, procédé d'enregistrement laser et programme permettant une irradiation laser pour un enregistrement laser - Google Patents

Dispositif d'enregistrement laser, procédé d'enregistrement laser et programme permettant une irradiation laser pour un enregistrement laser Download PDF

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Publication number
WO2020189701A1
WO2020189701A1 PCT/JP2020/011892 JP2020011892W WO2020189701A1 WO 2020189701 A1 WO2020189701 A1 WO 2020189701A1 JP 2020011892 W JP2020011892 W JP 2020011892W WO 2020189701 A1 WO2020189701 A1 WO 2020189701A1
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WIPO (PCT)
Prior art keywords
image
laser light
unit pixel
laser
recording medium
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Application number
PCT/JP2020/011892
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English (en)
Inventor
Yohsuke Tanaka
Kazutaka Yamamoto
Tomomi Ishimi
Tomohiro Yamashita
Yuki Ogawa
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Ricoh Company, Ltd.
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Priority claimed from JP2020046344A external-priority patent/JP7435088B2/ja
Application filed by Ricoh Company, Ltd. filed Critical Ricoh Company, Ltd.
Publication of WO2020189701A1 publication Critical patent/WO2020189701A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/475—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves
    • B41J2/4753—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves using thermosensitive substrates, e.g. paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light

Definitions

  • the present disclosure relates to a laser recording device, a laser recording method, and a program for laser irradiation for laser recording.
  • thermosensitive recording media that are configured to record images by changing, for example, hues and reflectivity through heating
  • contact-type recording methods using, for example, thermal stamps and thermal heads.
  • thermal printers using thermal heads are widely used in, for example, retail and logistics industries.
  • Thermal printers can adjust the recording density on the recording media based on the quantity of heat applied to the heating element provided per dot of the thermal heads.
  • printed images may have a higher density than intended, due to heat storage in dots that are adjacent to the heating element concerned and that have recorded images immediately before or record images simultaneously. Therefore, there may be a need for correcting the quantity of heat.
  • a proposed thermal printer can improve the accuracy of correction by counting the number of heating elements to which heat is applied within a predetermined time, in order not to degrade the quality of multi-tone images (for example, see PTL 1).
  • thermosensitive recording media various contactless recording methods using lasers have been proposed (for example, see PTL 2).
  • the present disclosure has an object to provide a laser recording device that can suppress density variation of an image and is less damaging to thermosensitive recording media.
  • a laser recording device includes a laser recording unit configured to irradiate a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium, and a control unit configured to perform control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the laser recording unit irradiates the thermosensitive recording medium with the laser light.
  • the present disclosure can provide a laser recording device that can suppress density variation of an image and is less damaging to thermosensitive recording media.
  • FIG. 1 is a schematic view illustrating an example of a laser recording device of the present disclosure.
  • FIG. 2 is a view illustrating an example of dots recorded on a thermosensitive recording medium by laser light emitted to the thermosensitive recording medium through optical fibers in a laser recording device of the present disclosure.
  • FIG. 3 is a diagram illustrating an example relationship between data of an image and dots recorded on a thermosensitive recording medium.
  • FIG. 4 is a graph plotting an example relationship between irradiation energy emitted to a thermosensitive recording medium and print image density.
  • FIG. 5A is a diagram illustrating an existing thermal head and a head of a laser recording device of the present disclosure by comparison.
  • FIG. 5A is a diagram illustrating an existing thermal head and a head of a laser recording device of the present disclosure by comparison.
  • FIG. 5B is a diagram illustrating an existing thermal head and a head of a laser recording device of the present disclosure by comparison.
  • FIG. 6 is a graph plotting an example relationship between laser output power and internal variable.
  • FIG. 7 is a diagram illustrating an example of an image formed by applying irradiation energy to a thermosensitive recording medium based on data of the image.
  • FIG. 8 is a diagram illustrating an example control performed by a laser recording device of the present disclosure for correcting print image density.
  • FIG. 9 is a diagram illustrating an example of a control performed by a laser recording device of the present disclosure for correcting print image density.
  • FIG. 10 is a flowchart illustrating an example process performed by a laser recording device of the present disclosure for correcting print image density.
  • FIG. 11A is a diagram illustrating an example of a solid image recorded by a laser recording device of the present disclosure at intermediate color developing densities, where the image is for comparison of presence and absence of output power correction.
  • FIG. 11B is a diagram illustrating an example of a solid image recorded by a laser recording device of the present disclosure at intermediate color developing densities, where the image is for comparison of presence and absence of output power correction.
  • FIG. 12A is a diagram illustrating another example of a recording result through a print image density correcting process performed by a laser recording device of the present disclosure.
  • FIG. 12B is a diagram illustrating an example of a recording result by a laser recording device of Comparative Example 1.
  • FIG. 12C is a diagram illustrating an example of a recording result by a laser recording device of Comparative Example 2.
  • FIG. 13 is a diagram illustrating a structure of a white color-developing thermosensitive recording medium used in Example 3.
  • FIG. 14 is a diagram illustrating an example structure of a black color-developing thermosensitive recording medium.
  • a laser recording device of the present disclosure includes a laser recording unit configured to irradiate a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium, and a control unit configured to perform control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the laser recording unit irradiates the thermosensitive recording medium with the laser light.
  • a laser recording method of the present disclosure includes a laser recording step of irradiating a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium, and a controlling step of performing control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the thermosensitive recording medium is irradiated with the laser light in the laser recording step.
  • the laser recording method of the present disclosure can be suitably performed by the laser recording device of the present disclosure.
  • the laser recording step can be suitably performed by the laser recording unit.
  • the controlling step can be suitably performed by the control unit. That is, the laser recording method of the present disclosure is the same as working the laser recording device of the present disclosure. Further, the laser recording device of the present disclosure is the same as performing the laser recording method of the present disclosure. Hence, the details of the laser recording method of the present disclosure will also be specified through description of the laser recording device of the present disclosure.
  • the laser recording device of the present disclosure is based on a finding that existing contactless recording methods using lasers have a problem that it is difficult to correct a recording density by the same method as used in thermal printers.
  • existing thermal printers can correct the quantity of heat taking into consideration the influence of heat storage in the heating elements for the adjacent dots that have recorded images immediately before or record images simultaneously.
  • recording methods using lasers involve no heating elements that may store heat. Therefore, it is difficult to apply the same correcting method as used in the existing thermal printers to the recording methods using lasers.
  • the laser recording device of the present disclosure includes a laser recording unit configured to record images on a thermosensitive recording medium, and a control unit configured to perform control of varying the irradiation energy of the laser light according to image luminance information in the data of an image when the laser recording unit irradiates the thermosensitive recording medium with the laser light.
  • the control unit performs control of changing a set amount of a current to be supplied to the laser light source in order to record an image having an image luminance value included in one unit pixel data that is included in the data of the image and corresponds to one unit pixel of the image, depending on a set amount of a current for recording a unit pixel adjacent to the one unit pixel.
  • the image luminance value may be a luminance (brightness) value in the data of the image included in the image luminance information.
  • the laser recording unit is configured to scan a laser light source over a thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium.
  • the laser recording unit is also configured to move the thermosensitive recording medium toward one side in the linear direction and toward one side in the direction orthogonal to the linear direction.
  • the laser recording unit is configured to emit laser light while scanning the laser light source or while moving the thermosensitive recording medium as described above, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium.
  • the method of the laser recording unit to record images on a thermosensitive recording medium is not particularly limited and may be appropriately selected depending on the intended purpose.
  • the thermosensitive recording medium may be moved relative to the laser recording unit, or the laser recording unit may be moved relative to the thermosensitive recording medium.
  • the linear direction refers to a direction along which a plurality of optical fibers are arranged or a direction orthogonal to the direction, when a configuration including a plurality of laser light sources is realized as an optical fiber array.
  • the linear direction also refers to mutually orthogonal directions in each of which a laser light source is scanned, when there is one laser light source.
  • thermosensitive recording medium When recording an image over a thermosensitive recording medium, for example, laser light is scanned over the thermosensitive recording medium to cause a portion irradiated with the laser light to generate heat and cause the thermosensitive recording medium to be heated by thermal diffusion from the portion generating the heat, to form an image.
  • the laser light source is not particularly limited and may be appropriately selected depending on the intended purpose.
  • Examples of the laser light source include a semiconductor laser and a solid optical fiber laser.
  • a semiconductor laser is preferable because a semiconductor laser has a wide range of wavelength selectivity, and has a small body as a laser recording device to allow downsizing and cost saving of the device.
  • the wavelength of the laser light is not particularly limited, may be appropriately selected depending on the intended purpose, and is preferably 700 nm or greater but 2,000 nm or less and more preferably 780 nm or greater but 1,600 nm or less.
  • the output power of the laser light is not particularly limited, may be appropriately selected depending on the intended purpose, and is preferably 1 W or higher and more preferably 3 W or higher. When the output power of the laser light is 1 W or higher, there is an advantage that an image will have a higher density.
  • the shape of the laser light per spot recording unit is not particularly limited and may be appropriately selected depending on the intended purpose.
  • Examples of the shape of the laser light include circular shapes, elliptic shapes, and various pentagonal shapes such as triangular shapes, quadrangular shapes, pentagonal shapes, and hexagonal shapes. Among these shapes, circular shapes and elliptic shapes are preferable.
  • the spot diameter X (micrometer) of the laser light emitted by the laser recording unit, expressed by half value width is not particularly limited, may be appropriately selected depending on the intended purpose, and is preferably 90 micrometers or greater but 150 micrometers or less.
  • the spot diameter X of the laser light expressed by half value width is 90 micrometers or greater but 150 micrometers or less, there is an advantage that fine, precise pictures or letters can be drawn with less drawing variation due to variation of the divergence angle (NA) of the laser.
  • NA divergence angle
  • the spot diameter can be measured with, for example, a beam profiler.
  • the laser recording unit include a plurality of laser light sources.
  • the configuration of the laser recording unit including a plurality of laser light sources is advantageous in that the recording time can be reduced compared with when only one laser light source is scanned.
  • the laser light sources may have variation in the energy of the laser light even when the current of the same magnitude is flowed through the laser light sources. Therefore, it is preferable to correct the energy of the laser light emitted by each of the plurality of laser light sources to be uniform.
  • the configuration including a plurality of laser light sources is not particularly limited and may be appropriately selected depending on the intended purpose.
  • An optical fiber array configuration in which optical fibers extending from a plurality of laser light sources are arranged in a line shape in a linear direction is preferable. Because this configuration has the plurality of laser light sources arranged in a line shape in a linear direction, print image luminance of one unit pixel is corrected taking into consideration the thermal energy of pixels adjacent to the one unit pixel from both sides in the linear direction.
  • the laser light sources may be disposed in a planar shape, such that a thermosensitive recording medium may be irradiated with laser light at a time to record an image. Because this configuration has the plurality of laser light sources disposed in a planar shape, print image luminance of one unit pixel is corrected taking into consideration the thermal energy of surrounding pixels adjacent to the one unit pixels from all directions.
  • the optical fiber array is not particularly limited and may be appropriately selected depending on the intended purpose.
  • the shortest distance (pitch) between the centers of the optical fibers is preferably 1.0 mm or less, more preferably 0.5 mm or less, and yet more preferably 0.03 mm or greater but 0.15 mm or less. When the shortest distance (pitch) between the centers of the optical fibers is 1.0 mm or less, high-resolution recording is possible and images with higher precision than hitherto obtained can be realized.
  • the number of optical fibers arranged in the optical fiber array is preferably 10 or greater, more preferably 50 or greater, and yet more preferably 100 or greater but 800 or less.
  • An optical system such as a lens may be disposed at the succeeding stage of the optical fiber array in order to control the spot diameter of the laser light.
  • the image is not particularly limited and may be appropriately selected depending on the intended purpose so long as the image is visible information.
  • Examples of the image include letters, symbols, lines, figures, and solid images, or combinations of the letters, symbols, lines, figures, and solid images, and QR codes (registered trademark), barcodes, and two-dimensional codes.
  • thermosensitive recording medium is not particularly limited and may be selected depending on the intended purpose so long as the thermosensitive recording medium is a medium on which an image can be recorded by laser light.
  • the shape of the thermosensitive recording medium include card shapes, tag shapes, label shapes, sheet shapes, and roll shapes.
  • the structure, size, and material of the thermosensitive recording medium are not particularly limited and may be appropriately selected depending on the intended purpose.
  • the thermosensitive recording medium may be referred to as medium below.
  • the control unit is configured to perform control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of an image when the laser recording unit irradiates the thermosensitive recording medium with the laser light.
  • a set amount of a current to be supplied to the laser light source in order to record an image having the image luminance value X0 is set to Y0 (Ah; ampere hour).
  • first adjacent unit pixel data DE1 included in the data of the image and corresponding to a first adjacent unit pixel E1 that is adjacent to the one unit pixel E0 from a side opposite to one side in a linear direction includes an image luminance value X1
  • a set amount of a current to be supplied to the laser light source in order to record an image having the image luminance value X1 is set to Y1 (Ah).
  • second adjacent unit pixel data DE2 included in the data of the image and corresponding to a second adjacent unit pixel E2 that is adjacent to the one unit pixel E0 from a straight line, which is the linear direction at another position parallel and adjacent to the linear direction at one position includes an image luminance value X2
  • a set amount of a current to be supplied to the laser light source in order to record an image having the image luminance value X2 is set to Y2 (Ah).
  • third adjacent unit pixel data DE3 included in the data of the image and corresponding to a third adjacent unit pixel E3 that is adjacent to the second adjacent unit pixel E2 from a side opposite to the one side on the straight line, which is the linear direction at the another position includes an image luminance value X3
  • a set amount of a current to be supplied to the laser light source in order to record an image having the image luminance value X3 is set to Y3 (Ah).
  • P, Q and R represent arbitrary numbers of 0 or greater but 1 or less.
  • the laser recording device of the present disclosure takes into consideration the heat that may be generated depending on the irradiation energy of the laser light for recording adjacent unit pixels, making it possible to suppress density variation of an image and make a thermosensitive recording medium less likely to be damaged.
  • the control unit be configured to control the supply amount of the current to be lower than or equal to the set amount of the current, taking into consideration the heat that may be generated depending on the irradiation energy of the laser light for recording adjacent unit pixels.
  • the current magnitude refers to the value of a current for the laser light source to emit laser light.
  • the current supply time refers to a time for which the current for emitting the laser light is flowed through the laser light source.
  • the method for supplying a current to the laser light source is not particularly limited and may be appropriately selected depending on the intended purpose. Examples of the method include a method based on pulse control of varying the time for which the current is flowed, and a method based on continuous control of varying the current magnitude.
  • control unit be configured to control the current supply time set for the supply amount of the current to be shorter than or equal to the current supply time set for the set amount of the current. Control on the current supply time to be shorter than or equal to the current supply time set for the set amount of the current is advantageous because such control can be easily realized with duty adjustment based on pulse control.
  • the print image density at which an image is recorded on a thermosensitive recording medium expressed by OD value, be 0.5 or greater but 1.4 or less.
  • the print image density expressed by OD value is 0.5 or greater but 1.4 or less, there is an advantage that an image can be recorded at an appropriate recording density.
  • the hardware of the control unit is not particularly limited and may be appropriately selected depending on the intended purpose so long as the control unit can perform various controls and operations.
  • Examples of the hardware of the control unit include processors such as central processing units (CPU).
  • the control unit is configured to realize various functions by executing an operating system (OS) and programs stored in, for example, an auxiliary memory unit, and perform various processes according to a control program for controlling the operation of the laser recording device of the present disclosure on the whole.
  • OS operating system
  • auxiliary memory unit for controlling the operation of the laser recording device of the present disclosure on the whole.
  • the same components will be denoted by the same reference numerals and redundant description about the same components may be skipped.
  • the number, position, and shape of the components are not limited to as specified in the embodiment, but may be set to any number, position, and shape that are suitable for working the present disclosure.
  • FIG. 1 is a schematic view illustrating an example of the laser recording device of the present disclosure including an optical fiber array.
  • the laser recording device 1 is configured to record an image formed of drawing units on a thermosensitive recording medium 31 by irradiating the thermosensitive recording medium 31 with laser light from an optical fiber array 11 arrayed in a main scanning direction orthogonal to a sub-scanning direction, which is indicated by an arrow in FIG. 1 and is a moving direction of the thermosensitive recording medium 31.
  • a plurality of laser light sources 13 are configured to guide light to the optical fiber array 11 through optical fibers 12.
  • the optical fiber array 11 is an arrangement of one or a plurality of array heads 11a in a line shape in the main scanning direction.
  • An optical system capable of controlling the spot diameter of the laser light is provided on the light path of the laser light emitted from the array heads 11a.
  • Energy applied to the laser light sources 13 is not fully converted to laser light, but is typically converted to heat, to cause the laser light sources 13 to generate heat. Therefore, the laser light sources 13 are cooled by a cooling unit 21.
  • Use of an optical fiber array 11 in order to arrange the laser light sources 13 with intervals makes it possible to reduce influence from a plurality of adjacent emissions, efficiently cool the laser light sources 13, and avoid temperature rise of the laser light sources 13 to reduce variation in the output power of the laser light, leading to a greater protection against recording density variation and white voids.
  • the laser recording device 1 controls the length of a drawing unit in the sub-scanning direction based on the spot diameter of the laser light on the thermosensitive recording medium 31, and based on the period and duty ratio of pulse signals to be input to the laser light sources 13 by driving units 14, such that drawing units adjacent to each other in the sub-scanning direction are recorded in a manner that the ends of the drawing units overlap with each other in the sub-scanning direction.
  • the laser light sources 13 are semiconductor lasers.
  • the wavelength of the laser light to be emitted is 957 nm.
  • the output power of the laser light is 10 W.
  • the output power of the laser light refers to irradiation energy and an average output power measured by a power meter.
  • the driving units 14 are configured to generate pulse signals based on drive signals input by a control unit 15 and output the pulse signals to the laser light sources 13, to drive the laser light sources 13.
  • the driving units 14 are provided for the plurality of the laser light sources 13 respectively, to drive the laser light sources 13 independently from one another.
  • the control unit 15 is configured to generate drive signals based on image information sent from a main control unit 16 and output the drive signals to the driving units 14, to control the driving units 14.
  • the main control unit 16 includes, for example, a central processing unit (CPU) configured to control various operations of the laser recording device 1, and is configured to execute various processes according to a control program for controlling the operation of the laser recording device 1 on the whole.
  • CPU central processing unit
  • the main control unit 16 is communicably coupled to the control unit 15 and configured to send, for example, image information to the control unit 15.
  • a power supply unit 17 is configured to supply power to, for example, the control unit 15.
  • the cooling unit 21 is disposed below the driving units 14 and the laser light sources 13, and configured to cool the driving units 14 and the laser light sources 13 using a constant-temperature liquid circulated by a chiller 22.
  • the chiller method includes only cooling and does not include heating. Therefore, the temperature of the light sources does not become higher than the set temperature of the chiller, but the temperature of the cooling unit 21 and of the laser light sources 13 contacting the cooling unit 21 may fluctuate depending on the ambient temperature. Meanwhile, when semiconductor lasers are used as the laser light sources 13, there occurs a phenomenon that the laser output power varies depending on the temperature of the laser light sources 13 (the laser output power becomes higher when the temperature of the laser light sources becomes lower).
  • a conveying unit 41 is configured to convey the thermosensitive recording medium 31 in the sub-scanning direction.
  • FIG. 2 is a view illustrating an example of dots recorded on the thermosensitive recording medium by the laser light emitted to the thermosensitive recording medium through optical fibers in the laser recording device of the present disclosure.
  • the laser light emitted by the laser light sources form images on image surfaces (beam spots) denoted by black dots in FIG. 2 through the optical fibers and the lens unit.
  • the laser light that has formed images on the beam spots is absorbed into the thermosensitive recording medium and converted to heat.
  • the thermosensitive recording medium develops colors, to form dots, which are unit pixels.
  • the structure of the optical fiber includes a central core through which laser light passes, and a clad layer provided on the circumference of the core.
  • the region that develops a color is wider than the image formed as a beam spot, because heat diffuses when the heat is absorbed into the thermosensitive recording medium, to have the threshold exceeded even at the surrounding region.
  • the color developing region of a dot shape is longer in the sub-scanning direction than in the main scanning direction, because the thermosensitive recording medium or the laser light source is moved even while the thermosensitive recording medium is irradiated with the laser light, to slip the laser light over the thermosensitive recording medium in the sub-scanning direction and make the heat diffuse in the sub-scanning direction.
  • FIG. 3 is a diagram illustrating an example relationship between data of the image and dots recorded on the thermosensitive recording medium.
  • the direction in which the thermosensitive recording medium is moved is the linear direction (sub-scanning direction over a print surface), and the direction in which the plurality of laser light sources (array heads) of the optical fiber array are arranged side by side in a line shape is an orthogonal direction (main scanning direction).
  • the laser recording device is configured to form an image at a time by irradiating the thermosensitive recording medium moved in the sub-scanning direction with laser light from the plurality of laser light sources arranged side by side in the orthogonal direction based on input data of an image.
  • the laser recording device records the image on the thermosensitive recording medium in a manner that the input order of the data of the image matches the moving direction of the thermosensitive recording medium.
  • the laser recording device can suppress density variation of the image by outputting pulse signals that are based on the luminance values in the data of the image to the laser light sources, and the control unit performs control of varying the irradiation energy of the laser light to make the thermosensitive recording medium less likely to be damaged. This control will be described in detail with reference to FIG. 8 to FIG. 10.
  • the thermosensitive recording medium according to the present embodiment is a recording medium containing a material that converts light to heat. Next, the thermosensitive recording medium will be described.
  • FIG. 4 is a graph plotting an example relationship between irradiation energy emitted to the thermosensitive recording medium and print image density.
  • the graph of FIG. 4 plots the density characteristic of the thermosensitive recording medium when developing a color as an image, with respect to irradiation energy emitted to the thermosensitive recording medium.
  • the vertical axis represents a color developing density value (OD), and the horizontal axis represents the irradiation energy of the laser light emitted to the thermosensitive recording medium.
  • the density value at which the thermosensitive recording medium develops a color as an image becomes gradually higher, as the irradiation energy of the laser light emitted from the laser light sources is increased.
  • the density value at which a color is developed as an image is eventually saturated.
  • the image to be recorded can be expressed with tones, with adjustment of the irradiation energy in a manner to utilize the density region (intermediate color developing densities) from the start of rise of the print image density value to the saturation of the print image density value.
  • the laser recording device according to the present embodiment can be suitably used for expressing tones utilizing intermediate color developing densities by a method different from methods employed by existing thermal heads
  • FIG. 5A and FIG. 5B are diagrams illustrating an existing thermal head and the head of the laser recording device of the present disclosure by comparison.
  • the existing thermal head has heating elements near a thermosensitive recording medium, and often has covers on the heating elements. Therefore, the existing thermal head has a structure that is preventive against dissipation of heat from the environment surrounding the thermosensitive recording medium, and the ambient temperature is stabilized at a high temperature. Therefore, even if there is some variation in the quantity of heat of the heating elements, the existing thermal head tends to be able to suppress density variation of an image based on the stable ambient temperature and can easily improve the quality of an image expressed with tones.
  • FIG. 5A the existing thermal head has heating elements near a thermosensitive recording medium, and often has covers on the heating elements. Therefore, the existing thermal head has a structure that is preventive against dissipation of heat from the environment surrounding the thermosensitive recording medium, and the ambient temperature is stabilized at a high temperature. Therefore, even if there is some variation in the quantity of heat of the heating elements
  • a contactless recording device using lasers can only cause the portions of a thermosensitive recording medium irradiated with laser light to generate heat, and needs a distance for the laser light to form an image through an optical system. Therefore, the contactless recording device has a structure that is supportive for dissipation of heat from the environment surrounding the thermosensitive recording medium, compared with the existing thermal head. Therefore, it is difficult to apply the same correcting method as used in the existing thermal printer to the contactless recording device using lasers.
  • the laser recording device is configured to perform correction as illustrated in FIG. 6, such that the laser light sources have the uniform irradiation energy when the current of the same magnitude is flowed through the laser light sources.
  • FIG. 6 is a graph plotting an example relationship between laser output power and internal variable.
  • FIG. 6 plots variation of the irradiation energy of individual laser light sources, and presents measurement results of representative two laser light sources among the plurality of laser light sources with output power correction.
  • Output power correction is for eliminating variation among the laser light sources in the output power emitted to the thermosensitive recording medium (variation in the irradiation energy), and making the output power uniform among the laser light sources.
  • a laser power meter 50(150)A-BB-26, available from OPHIR is used for the measurement.
  • the laser recording device of the present disclosure includes a memory in the laser recording device, and can store a variable for adjustment (hereinafter referred to as internal variable) for each laser light source.
  • internal variable a variable for adjustment
  • By increasing or decreasing the value of the internal variable it is possible to increase or decrease the magnitude of the current to be flowed through the corresponding laser light source by means of the driving unit.
  • the internal variables are determined in a manner to make the laser light sources uniform in the irradiation energy. The result of measuring the irradiation energy on the surface of the thermosensitive recording medium is reflected not only on the internal variables, but the values of the current to be flowed through the laser light sources and the duty of the current.
  • the laser light sources are controlled to emit laser light based on the set current values and duties, measurement of the irradiation energy while increasing or decreasing the internal variables is repeated until the intended irradiation energy is achieved, and the internal variables at which the intended irradiation energy is achieved are stored in the memory.
  • FIG. 7 is a diagram illustrating an example of an image formed by applying irradiation energy to the thermosensitive recording medium based on data of the image.
  • FIG. 7 illustrates that despite the adjustment to make the laser light sources uniform in the irradiation energy based on the internal variables, an image may have density variation when the image is an aggregation of dots. An image formed of a single dot will not have density variation. However, an image formed of aggregation of dots needs to be recorded so as not to have white voids. This needs the thermosensitive recording medium to be irradiated with laser light in a manner that the dots partially overlap one another.
  • the center region of the aggregation of dots is significantly influenced by the heat from adjacent dots, to make the thermosensitive recording medium likely to be damaged when the image is recorded.
  • Simply reducing the irradiation energy for the data of the whole image in order to prevent the damage makes an aggregation of dots less likely to be irradiated with excessive energy, but makes the print image density of a single dot lower due to insufficiency of the irradiation energy.
  • there is a need for correction taking into consideration the influence of heat in the center region of the aggregation of dots, as illustrated in FIG. 8.
  • FIG. 8 is a diagram illustrating an example control performed by the laser recording device of the present disclosure for correcting print image density.
  • input data of an image is 5 pixels ⁇ 5 pixels, 8-bit monochrome data, and 3 pixels ⁇ 3 pixels in the center represent a solid image having a luminance value of 0.
  • rows correspond to the linear direction (sub-scanning direction), and columns correspond to the orthogonal direction (main scanning direction) orthogonal to the linear direction.
  • the duty ratios at the central 3 pixels ⁇ 3 pixels are 100% (see the lower left of FIG. 8).
  • a duty ratio of 100% means an amount of a current for obtaining a saturated print image density at each pixel.
  • the control unit performs control of changing a set amount of a current to be supplied to a laser light source for recording an image having an image luminance value included in one unit pixel data that is included in the data of the image and corresponds to one unit pixel of the image, depending on set amounts of currents for recording unit pixels adjacent to the one unit pixel.
  • the current is supplied in an amount taking into consideration the heat that may be generated depending on the irradiation energy of the laser light for recording adjacent unit pixels, making it possible to record a solid image suppressed in density variation and make the thermosensitive recording medium less likely to be damaged.
  • FIG. 8 is an example in which an optical fiber array formed of three laser emitting ports that are arranged to be adjacent to one another in the orthogonal direction (main scanning direction) is used as an optical fiber array configured to emit laser.
  • FIG. 9 is a diagram illustrating an example of a control performed by the laser recording device of the present disclosure for correcting print image density.
  • the pixel at (3,3) is assumed as the one unit pixel E0 of interest.
  • the pixel data of the one unit pixel E0 is denoted by DE0, and the duty for recording the one unit pixel without correction of the print image density is denoted by D0.
  • the pixels at (3,2), (2,3), (2,2), (2,4), (3,4), (4,3), (4,2), and (4,4) surrounding the one unit pixel E0 are denoted by E1, E2, E3, E4, E5, E6, E7, and E8.
  • the pixel data of these pixels are denoted by DE1, DE2, DE3, DE4, DE5, DE6, DE7, and DE8.
  • the duties for recording these pixels without correction of the print image density are denoted by D1, D2, D3, D4, D5, D6, D7, and D8.
  • the positional relationships between the one unit pixel E0 of interest and adjacent unit pixels E1, E2, E3, E4, E5, E6, E7, and E8 can be classified based on positions in the scanning direction (linear direction, sub scanning direction) of the laser light of the optical fiber array and positions in the orthogonal direction (main scanning direction).
  • the example here is an example in which an optical fiber array formed of three laser emitting ports that are arranged to be adjacent to one another in the orthogonal direction (main scanning direction) is used as the optical fiber array.
  • the pixels can be divided into groups as follows.
  • ⁇ E1> A group of a pixel adjacent to the pixel E0 from a side opposite to one side (the side toward which scanning advances) in the scanning direction of the laser light (linear direction; sub-scanning direction). That is, the pixel in this group is positioned upstream of the pixel E0 in the sub-scanning direction, and irradiated with the laser light before the pixel E0.
  • ⁇ E2 and E6> A group of pixels adjacent to the pixel E0 in the orthogonal direction (main scanning direction). That is, the pixels in this group are irradiated with the laser light at the same timing as the pixel E0.
  • ⁇ E3 and E7> A group of pixels positioned on a line that is parallel with the orthogonal direction (main scanning direction) and is adjacent to the pixel E0 from a side opposite to one side (the side toward which scanning advances) in the scanning direction of the laser light (linear direction; sub-scanning direction).
  • this group is a group of pixels adjacent to the pixel E1 in the orthogonal direction (main scanning direction). That is, the pixels in this group are irradiated with the laser light at the same timing as the pixel E1.
  • ⁇ E5> A group of a pixel adjacent to the pixel E0 from the downstream side in the sub-scanning direction.
  • ⁇ E4 and E8> A group of pixels positioned on a line that is parallel with the orthogonal direction (main scanning direction) and is adjacent to the pixel E0 from one side (the side toward which scanning advances) in the scanning direction of the laser light (linear direction; sub-scanning direction).
  • this group is a group of pixels adjacent to the pixel E5 in the orthogonal direction (main scanning direction). That is, the pixels in this group are irradiated with the laser light at the same timing as the pixel E5.
  • Print image density correction for the optical fiber array configuration has been described above.
  • the configuration is not limited to the above.
  • consideration will be given to a case of repeating scanning of emitting laser light to the first row in the sub-scanning direction and emitting laser light to the second row in the sub-scanning direction.
  • a program of laser irradiation for laser recording of the present disclosure can be suitably executed to work the laser recording method of the present disclosure. That is, the program for laser irradiation for laser recording of the present disclosure can work the laser recording method of the present disclosure using, for example, computers as hardware resources.
  • the program for laser irradiation for laser recording of the present disclosure may be executed by at least any one selected from one or a plurality of computers and servers. In the process according to the program for laser irradiation for laser recording of the present embodiment, the output power of each laser light source has previously been corrected based on the internal variable.
  • FIG. 10 is a flowchart illustrating an example process performed by the laser recording device of the present disclosure for correcting print image density.
  • control unit moves the flow to the step S102 when an input unit receives data of an image of a BMP format (BMP image).
  • the control unit converts the received data of the BMP image to the image luminance value of each pixel data, and moves the flow to the step S103.
  • the image luminance may have a value of from 0 through 255.
  • the laser recording device has a function that enables the user to set at which of an image luminance value of 0 and an image luminance value of 255 the maximum irradiation energy is output for irradiation.
  • the control unit converts the image luminance value obtained from the conversion to a duty ratio for each pixel in the input data of the image, and moves the flow to the step S104.
  • the control unit checks the duty ratios of surrounding pixels of one pixel, and moves the flow to the step S105.
  • the control unit irradiates each pixel with laser light having irradiation energy of the duty ratio set for each pixel.
  • the steps S102 to S106 described above may be repeated for all pixels in the received data of the BMP image, to print the BMP image. Correction of the data of a BMP image is performed each time data of a BMP image is input.
  • the laser recording device illustrated in FIG. 1 to FIG. 3 was used.
  • the laser recording device had an optical fiber array in which thirty-two fiber coupling LDs having the maximum output power of 30 W as the plurality of laser light sources were arranged side by side in the main scanning direction and the pitch interval X between adjacent optical fibers was 127 micrometers.
  • the internal variable of each fiber coupling LD was varied, to correct the output power in a manner to make the fiber coupling LDs uniform in the irradiation energy.
  • the peak power of the laser light was set to 5W.
  • the focus position was adjusted to fix the spot diameter to 105 micrometers.
  • the optical fibers had a diameter of 125 micrometers and a core diameter of 105 micrometers.
  • thermosensitive recording medium containing a photothermal conversion material in a content adjusted in a manner to reach a saturated color development at an irradiation energy of 5 W per laser light source, at a thermosensitive recording medium moving speed of 3 m/sec.
  • the recorded solid image is illustrated in FIG. 11A.
  • Example 2 A solid image was recorded at intermediate color developing densities in the same manner as in Example 1, except that unlike in Example 1, output power correction to make the laser light sources uniform in the irradiation energy was not performed.
  • the recorded solid image is illustrated in FIG. 11B.
  • Example 3 An image including a solid image portion and a fine-line portion was recorded in the same manner as in Example 1, except that unlike in Example 1, the thermosensitive recording medium was changed to a white color-developing thermosensitive recording medium described below, the output power correction performed in Example 1 and the print image density correction taking into consideration the effect from E1 to E8 to E0 illustrated in FIG. 9 were performed, a picture of the recorded image was taken with a black sheet of paper underlaid, and the solid image at intermediate color developing densities was changed to an image including a solid image portion and a fine-line portion.
  • the recorded image was evaluated in the manners described below, and the results are presented in Table 1.
  • the recorded image is illustrated in FIG. 12A.
  • the white color-developing thermosensitive recording medium had a surface active layer with a coating thickness of 1 micrometer for a better adhesiveness, a recording layer with a thickness of 4 micrometers, an oxygen barrier layer with a thickness of 2 micrometers, an adhesive layer with a thickness of 7 micrometers, and a protective layer with a thickness of 12 micrometers in this order over PET (with a transparent color) serving as a base material. Calcium carbonate and a styrene-acrylic copolymer were added in the recording layer. The same transparent PET material as used as the base material was used as the protective layer.
  • Example 1 An image including a solid image portion and a fine-line portion was recorded in the same manner as in Example 3, except that unlike in Example 3, the print image density correction was not performed, and the output power of the laser light sources was adjusted to make the fine-line portion of the image clear.
  • the recorded image was evaluated in the manners described below. The results are presented in Table 1. The recorded image is illustrated in FIG. 12B.
  • Example 2 An image including a solid image portion and a fine-line portion was recorded in the same manner as in Example 3, except that unlike in Example 3, the print image density correction was not performed, and the output power of the laser light sources was adjusted to make the solid image portion of the image clear.
  • the recorded image was evaluated in the manners described below. The results are presented in Table 1. The recorded image is illustrated in FIG. 12C.
  • thermosensitive recording medium was not damaged and visibility of barcode and letters was good.
  • the white color-developing thermosensitive recording medium was used in Example 3 and Comparative Examples 1 and 2. However, this is non-limiting.
  • a black color-developing thermosensitive recording medium may be used.
  • An example black color-developing thermosensitive recording medium is illustrated in FIG. 14.
  • an example black color-developing thermosensitive recording medium may have a structure including a recording layer coated with an average thickness of 3.2 micrometers over a PET base material (white color) serving as a base material, and a protective layer with an average thickness of 2 micrometers over the surface of the recording layer.
  • the recording layer may contain a developer, a leuco dye, and a photothermal conversion material.
  • the laser recording device of the present disclosure includes a laser recording unit configured to irradiate a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium, and a control unit configured to perform control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the laser recording unit irradiates the thermosensitive recording medium with the laser light.
  • a laser recording device including: a laser recording unit configured to irradiate a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium; and a control unit configured to perform control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the laser recording unit irradiates the thermosensitive recording medium with the laser light, wherein the control unit is configured to perform control of changing a supply amount
  • ⁇ 3> The laser recording device according to ⁇ 1> or ⁇ 2>, wherein of the supply amount of the current and the set amount of the current both expressed by a product of a current magnitude and a current supply time, the supply amount of the current is controlled to be lower than or equal to the set amount of the current.
  • ⁇ 4> The laser recording device according to ⁇ 3>, wherein the current magnitude is controlled to be constant, and the current supply time for the supply amount of the current is controlled to be shorter than or equal to the current supply time for the set amount of the current.
  • ⁇ 5> The laser recording device according to any one of ⁇ 1> to ⁇ 4>, wherein the laser recording unit includes a plurality of the laser light source, and wherein the plurality of laser light sources are corrected to be uniform in energy of the laser light to emit.
  • the data of the image to be recorded on the thermosensitive recording medium includes image luminance values, expressed by OD values, of 0.5 or greater but 1.4 or less.
  • a laser recording device including: a laser recording unit configured to irradiate a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium; and a control unit configured to perform control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the laser recording unit irradiates the thermosensitive recording medium with the laser light, wherein the control unit is configured to perform control of changing a supply amount Z (Ah) of a current to be supplied to the laser
  • a laser recording method including: irradiating a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium; and performing control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the thermosensitive recording medium is irradiated with the laser light in the irradiating, wherein the performing control includes performing control of changing a supply amount Z (Ah) of a current to be supplied to the laser light source in order to actually record one unit pixel
  • thermosensitive recording medium A program for laser irradiation for laser recording, the program being used for laser recording of irradiating a thermosensitive recording medium with laser light while scanning a laser light source over the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction or moving the thermosensitive recording medium toward one side in a linear direction and toward one side in a direction orthogonal to the linear direction based on information on positions, on the thermosensitive recording medium, of data of an image to be recorded on the thermosensitive recording medium, to record an image formed of a group of unit pixels that have developed colors in response to being irradiated with the laser light on the thermosensitive recording medium, the program causing a computer to execute control of varying irradiation energy of the laser light emitted by the laser light source according to image luminance information in the data of the image when the thermosensitive recording medium is irradiated with the laser light, wherein the control includes control of changing a supply amount Z (Ah) of a current to be supplied
  • the laser recording device according to any one of ⁇ 1> to ⁇ 8>, the laser recording method according to ⁇ 9>, and the program for laser irradiation for laser recording according to ⁇ 10> can solve the various problems in the related art and can achieve the object of the present disclosure.
  • laser recording device 11 optical fiber array head 11a: array head 12: optical fiber 13: laser light source 14: driving unit 15: control unit 16: main control unit 17: power supply unit 21: cooling unit 22: chiller 31: thermosensitive recording medium 41: conveying unit

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Abstract

La présente invention concerne un dispositif d'enregistrement laser comprenant : une unité d'enregistrement laser configurée pour éclairer un support d'enregistrement thermosensible avec une lumière laser sur la base d'informations de position de données d'image sur le support pour enregistrer une image sur le support ; et une unité de commande configurée pour faire varier l'énergie d'exposition à la lumière laser pendant une exposition au laser en fonction d'informations de luminance d'image incluses dans des données d'image et d'une quantité de changement Z d'un courant d'alimentation à fournir à une source de lumière laser afin d'enregistrer réellement un pixel unitaire (E0) selon Z ＝ Y0 － [ (P × Y1) + (Q × Y2) ＋ (R × Y3)], où Y1, Y2 et Y3 sont des quantités définies de courants définis pour un premier pixel unitaire adjacent (E1), un deuxième pixel unitaire adjacent (E2) et un troisième pixel unitaire adjacent (E3) par rapport au pixel unitaire (E0).
PCT/JP2020/011892 2019-03-20 2020-03-18 Dispositif d'enregistrement laser, procédé d'enregistrement laser et programme permettant une irradiation laser pour un enregistrement laser WO2020189701A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638109A (en) * 1993-09-14 1997-06-10 Fuji Photo Film Co., Ltd. Method of recording image with laser beam
JP2000211174A (ja) 1999-01-25 2000-08-02 Casio Comput Co Ltd サ―マルプリンタ
US20100128102A1 (en) * 2007-04-26 2010-05-27 Fumitomo Yamasaki Optical disc label printer, thermosensitive recording printer and thermosensitive recording method
JP2017140833A (ja) 2016-02-05 2017-08-17 株式会社リコー 記録方法及び記録装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638109A (en) * 1993-09-14 1997-06-10 Fuji Photo Film Co., Ltd. Method of recording image with laser beam
JP2000211174A (ja) 1999-01-25 2000-08-02 Casio Comput Co Ltd サ―マルプリンタ
US20100128102A1 (en) * 2007-04-26 2010-05-27 Fumitomo Yamasaki Optical disc label printer, thermosensitive recording printer and thermosensitive recording method
JP2017140833A (ja) 2016-02-05 2017-08-17 株式会社リコー 記録方法及び記録装置

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