Method for controlling a printer or copier using a toner mark band and reflex sensor working according to the triangulation principle

• US 20060251436A1
• Filed: 07/31/2002
• Published: 11/09/2006
• Est. Priority Date: 08/02/2001
• Status: Active Grant

• Current Assignee: Oce Printing Systems GmbH (Canon Inc.)
• Original Assignee: Oce Printing Systems GmbH (Canon Inc.)
• Inventors: Lay, Heinrich, Best, Arno, Hollig, Uwe, Mayr, Michael, Schmidt-Behounek, Thomas, Schreieder, Josef, Baumler, Ulrich, Hauns, Rudiger, Winter, Hans, Schullerus, Wolfgang, Maess, Volkhard
• Granted Patent: US 7,260,334 B2
• Time in Patent Office: Days
• US Class Current: 399/49
• CPC Class Codes: G03G 15/1605 using at least one intermediate support G03G15/1625 takes precedence
• CPC Class Codes: G03G 15/5041 Detecting a toner image, e.g. density, toner coverage, using a test patch G03G15/553 takes precedence
• CPC Class Codes: G03G 2215/00059 on intermediate image carrying member, e.g. transfer belt

Abstract

A method and device controls a printer or copier to generate a plurality of marks that are assembled into a coherent marking band that is then inked by the toner. A sensor measures the marking band. The printer or copier are controlled based on the output of the sensor.

Claims

1-52. -52. (canceled)

53. A method to control a print or copier, comprising the steps of:

storing marking data for toner markings for a character generator in an image control;

generating a latent image on an intermediate carrier using the character generator corresponding to the marking data;

combining a plurality of markings in the image control into a coherent marking band, each marking having a spatially defined position within the marking band on the intermediate carrier;

inking the marking band with toner material;

scanning the toner markings of the marking band by at least one sensor;

controlling a print process using a signal of the at least one sensor;

storing measurement data for a plurality of toner markings;

assembling at least one marking band from the plurality of toner markings; and

selecting an appropriate marking band dependent on a selected print process.

54. A method according to claim 53, further comprising the step of:

defining a single marking band whose toner markings permit a plurality of print processes of a device type to control a printer or copier.

55. A method according to claim 53, further comprising the step of:

applying the at least one marking band with the plurality of toner markings to the intermediate carrier in a region that lies within a print image to be printed in order to be able to implement test functions and compensation functions.

56. A method according to claim 53, further comprising the step of:

applying the at least one marking band to the intermediate carrier along an edge track outside of a print image to be printed in order to not disturb the print image.

57. A method according to claim 53, further comprising the step of:

synchronizing a beginning of the at least one marking band with a beginning of a print side after each print start, a beginning of the marking band coinciding with a beginning of a print side.

58. A method according to claim 53, wherein said at least one marking band comprises a plurality of marking bands, and further comprising the step of:

controlling beginnings of successive ones of said plurality of marking bands by the image control independent of pages to be printed.

59. A method according to claim 58, further comprising the steps of:

synchronizing each of said plurality of marking bands with a beginning of each print side, a beginning of a respective marking band coincides with a beginning of a respective print side.

60. A method according to claim 53, wherein said at least one marking band comprises a plurality of marking bands, and further comprising the steps of:

serially connecting said plurality of marking bands given a greater page length of a print side.

61. A method according to claim 53, further comprising the step of:

combining data for print sides and data for marking bands in a transfer of data to the character generator.

62. A method according to claim 53, further comprising the step of:

combining data of the marking bands and data for the print sides in the image control before generation of image raster data.

63. A method according to claim 53, wherein an electronic diaphragm control acts on the character generator such that the character generator only generates latent images on the intermediate carrier for predetermined toner markings of a marking band.

64. A method according to claim 63, further comprising the step of:

selecting toner markings by the device control depending on a selected print process.

65. A method according to claim 53, further comprising the steps of:

providing a plurality of scanning sensors to scan toner markings;

signaling a beginning of a marking band via a trigger pulse using a device control; and

actively switching respective ones of said plurality of scanning sensors with regard to this trigger pulse to scan predetermined toner markings.

66. A method according to claim 53, providing a band shaped intermediate carrier as said intermediate carrier.

67. A method as claimed in claim 66, wherein said intermediate carrier band is an OPC band.

68. A method according to claim 53, further comprising the steps of:

providing two printing units within a device, each of said two printing units having one respective intermediate carrier band;

providing a top of a carrier material with a toner image using an intermediate carrier band;

providing a bottom of the carrier material with a toner image using the other intermediate carrier band; and

applying marking bands with toner markings to each intermediate carrier band.

69. A method according to claim 68, wherein said step of applying the marking bands on both intermediate carrier bands ensues such that two toner markings inked with toner are not simultaneously juxtaposed at the common transfer printing location for both transfer bands.

70. A method according to claim 53, further comprising the step of:

selecting a length of the marking band such that it is not an even-number multiple of a length of the intermediate carrier.

71. A method according to claim 53, further comprising the steps of:

determining a thickness of the toner layer of the toner marking according to a triangulation method using an optical reflex sensor as a sensor to scan respective toner marking; and

controlling the print process dependent on a determined thickness of the toner layer.

72. A method according to claim 71, wherein said optical reflex sensor includes:

at least one laser diode that radiates radiation in a direction of the toner marking as a radiation source; and

one of a linear detector array and a two-dimensional detector array as a receiver.

73. A method according to claim 72, further comprising the steps of:

generating at least one measurement spot using at least one laser diode; and

imaging said at least one measuring spot on said detector array via a lens.

74. A method according to claim 73, further comprising the steps of:

determining a curve of brightness along the respective measurement spot for each measurement spot; and

determining a center of the respective measurement spot dependent on the curve; and

determining a thickness of the toner layer dependent on the separation between the centers of the measurement spots.

75. A method according to claim 74, further comprising the step of:

using a balance point of the curve of the brightness as a center for the respective measurement spot.

76. A method according to claim 71, further comprising the step of:

determining a mass coating with regard to area is determined from the thickness of the toner layer via calibration.

77. A method as claimed in claim 76, wherein said determining step determines the mass coating in grams per unit area of the toner.

78. A method according to claim 71, wherein said reflex sensor includes a color filter on a receiver side via which extraneous light is suppressed.

79. A method as claimed in claim 78, wherein said color filter is a bandpass filter.

80. A method according to claim 72, further comprising the step of:

using a controlled power supply for the laser diode; and

measuring supplied current such that the signal of the detector array lies within a predetermined range.

81. A method according to claim 72, further comprising the step of:

adjusting current for the laser diode such that a signal on a side of the receiver remains constant and independent of the reflection property of at least one of toner marking and the intermediate carrier.

82. A method as claimed in claim 81, wherein said intermediate carrier is a photoconductor surface.

83. A method according to claim 73, further comprising the step of:

varying a position of said at least one measurement spot on the toner marking from rotation to rotation of the intermediate carrier.

84. A method according to claim 72, wherein a beam emitted by the laser diode is one of attenuated and interrupted.

85. A method according to claim 84, further comprising the step of:

interrupting the beam using a mechanical diaphragm.

86. A method according to claim 84, further comprising the step of:

interrupting the beam using a voltage-controlled liquid crystal shutter.

87. A method according to claim 71, further comprising the step of:

using a radiation source as the reflex sensor having a radiation wavelength outside of a sensitivity range for the wavelength of the light of said intermediate carrier.

88. A method according to claim 71, wherein said radiation source of the reflex sensor radiates radiation with two different wavelengths.

89. A method according to claim 88, further comprising the steps of:

coupling the radiation of two laser diodes in a mutual beam path to generate the radiation of different wavelengths.

90. A method as claimed in claim 89, wherein said step of coupling uses semi-permeable mirrors.

91. A method according to claim 71, further comprising the step of:

using a VCSEL radiation source as a radiation source.

92. A method according to claim 71, further comprising the step of:

using an individual radiation receiver on the receiver side to which radiation is supplied via a mirror that can be varied with regard to its angle of rotation.

93. A device to control a print or copier, comprising:

an intermediate carrier;

an image control operable to control storage of marking data for toner markings;

a character generator connected to said image control and operable to generate a latent image on said intermediate carrier corresponding to the marking data;

said image control being operable to combine a plurality of markings into a coherent marking band, each marking having a spatially defined position within the marking band on the intermediate carrier;

an inking apparatus positioned adjacent to said intermediate carrier and operable to ink the latent image with toner material;

at least one sensor operable to scan the toner markings of the marking band and connected to provide an output signal to control the print process; and

a storage in which measurement data are stored for a plurality of toner markings;

said image control being operable to assemble at least one marking band from said plurality of toner markings, an appropriate marking band being selected dependent on a selected print process.

94. A device according to claim 93, wherein a single marking band is defined whose toner markings permit the plurality of print processes of a device type to control a printer or copier.

95. A device according to claim 93, wherein the at least one marking band with the plurality of toner markings is applied to the intermediate carrier in a region that lies within the print image to be printed, in order to be able to implement test functions and compensation functions.

96. A device according to claim 93, wherein the at least one marking band is applied to the intermediate carrier along an edge track outside of the print image to be printed, in order to not disturb the print images.

97. A device according to claim 93, wherein the beginning of the first marking band is synchronized with the beginning of the first print side after each print start, whereby the beginning of the first marking band preferably coincides with the beginning of the first print side.

98. A device according claim 93, wherein the image control administrates the beginnings of the successive marking bands independent of the pages to be printed.

99. A device according to claim 98, wherein each marking band is synchronized with the beginning of each print side, whereby the beginning of the respective marking band preferably coincides with the beginning of the respective print side.

100. A device according to claim 93, wherein a plurality of marking bands are connected serially given the greater page length of a print side.

101. A device according to claim 93, wherein the data for print sides and the data for marking bands are combined in the transfer of the data to the character generator.

102. A device according to claim 93, wherein the data of the marking bands and the data for the print sides are combined in the image control before the generation of the image raster data.

103. A device according to claim 93, further comprising:

an electronic diaphragm control acts on the character generator such that the character generator only generates latent images on the intermediate carrier from predetermined toner markings of a marking band.

104. A device according to claim 93, further comprising:

a plurality of scanning sensors are provided to scan toner markings;

a device control signals the beginning of a marking band via a trigger pulse; and

the respective scanning sensor is actively switched with regard to this trigger pulse to scan predetermined toner markings.

105. A device according to claim 93, wherein said intermediate carrier is an intermediate carrier band, preferably an OPC band.

106. A device according to claim 93, further comprising:

two printing units, with respectively one intermediate carrier band, are provided within a device, whereby an intermediate carrier band provides the top of a carrier material with a toner image, and the other intermediate carrier band provides the bottom of the carrier material with a toner image, and in which marking bands with toner markings are applied to each intermediate carrier band.

107. A device according to claim 106, in which the application of the marking bands on both intermediate carrier bands ensues such that two toner markings inked with toner are not simultaneously juxtaposed at the common transfer printing location for both transfer bands.

108. A device according to claim 93, wherein the length of the marking band is selected such that it is not an even-number multiple of the length of the intermediate carrier.

109. A device according to claim 93, further comprising:

an optical reflex sensor that determines the thickness of the toner layer of the toner marking according to the triangulation method is used as a sensor to scan the respective toner marking, and that the print process is controlled dependent on the determined thickness of the toner layer.