GB1435365A - Controlling a laser beam during the engraving of gravure printing surfaces - Google Patents

Controlling a laser beam during the engraving of gravure printing surfaces

Info

Publication number
GB1435365A
GB1435365A GB4312873A GB4312873A GB1435365A GB 1435365 A GB1435365 A GB 1435365A GB 4312873 A GB4312873 A GB 4312873A GB 4312873 A GB4312873 A GB 4312873A GB 1435365 A GB1435365 A GB 1435365A
Authority
GB
United Kingdom
Prior art keywords
engraving
laser
test signal
gain
test
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4312873A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crosfield Electronics Ltd
Original Assignee
Crosfield Electronics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Crosfield Electronics Ltd filed Critical Crosfield Electronics Ltd
Priority to GB4312873A priority Critical patent/GB1435365A/en
Priority to DE2443334A priority patent/DE2443334A1/en
Publication of GB1435365A publication Critical patent/GB1435365A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/0823—Devices involving rotation of the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/361—Removing material for deburring or mechanical trimming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B7/00—Machines, apparatus or hand tools for branding, e.g. using radiant energy such as laser beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/007—Marks, e.g. trade marks

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laser Beam Processing (AREA)

Abstract

1435365 Automatic control of gain CROSFIELD ELECTRONICS Ltd 6 Sept 1974 [13 Sept 1973] 43128/73 Heading G3R In a system for engraving gravure surfaces using a modulated laser beam, the effect of the beam due to a given modulating signal (i.e. the gain of the system) is kept constant by adjusting this quantity in response to the difference between the measured effect of a test signal and a reference value. The surface may comprise a metal workpiece in which are pre-etched cells filled with a material more easily decomposed or evaporated by the laser. As shown, laser 10 is modulated by picture signals from a scanner 14 whose operation is synchronized with the rotation of a gravure drum 12. Periodically e.g. once per revolution, an electronic switch 16 substitutes a ramp test signal from 22, the ramp being such as to embrace the signal strength necessary to initiate engraving. Onset of engraving is detected photo-electrically by 26 whose output opens a gate 28 for clockpulses from a generator 24 to a counter 30. The gate is closed at the end of the test signal and thus the number of gated pulses corresponds to the instant ( and hence the signal strength) that engraving started. If this differs from a number pre-set in the counter a D to A converter adjusts the gain of an amplifier 18 by an appropriate amount. The test band sensor may detect the difference in reflection from a lamp due to the onset of engraving Figs. 5 or 6, (not shown), or the resultant scattering of the laser itself. The sensor may detect and average the test bands produced during several preceding revolutions, or the current one only. It is mentioned that the surface may be a flat stationary one and that the depth of engraving due to a constant test signal may be measured instead of the time/ramp arrangement described.
GB4312873A 1973-09-13 1973-09-13 Controlling a laser beam during the engraving of gravure printing surfaces Expired GB1435365A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4312873A GB1435365A (en) 1973-09-13 1973-09-13 Controlling a laser beam during the engraving of gravure printing surfaces
DE2443334A DE2443334A1 (en) 1973-09-13 1974-09-11 METHOD AND DEVICE FOR ENGRAVING SURFACES WITH A LASER BEAM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4312873A GB1435365A (en) 1973-09-13 1973-09-13 Controlling a laser beam during the engraving of gravure printing surfaces

Publications (1)

Publication Number Publication Date
GB1435365A true GB1435365A (en) 1976-05-12

Family

ID=10427439

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4312873A Expired GB1435365A (en) 1973-09-13 1973-09-13 Controlling a laser beam during the engraving of gravure printing surfaces

Country Status (2)

Country Link
DE (1) DE2443334A1 (en)
GB (1) GB1435365A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTV20090184A1 (en) * 2009-09-24 2011-03-25 Cielle S R L LASER ENGRAVING MACHINE AND METHOD TO ADJUST THE POWER OF A LASER RAY IN THE SAME LASER ENGRAVING MACHINE

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131782A (en) * 1976-05-03 1978-12-26 Lasag Ag Method of and apparatus for machining large numbers of holes of precisely controlled size by coherent radiation
JPS6129029A (en) * 1984-07-19 1986-02-08 三菱電機株式会社 Method of indicating terminal number or like in solenoid relay or like
DE3923356C1 (en) * 1989-07-14 1991-02-07 Maho Ag
DE4040554A1 (en) * 1990-12-18 1992-07-02 Maho Ag MACHINE TOOL FOR REMOVING WORKPIECE MACHINING BY LASER BEAM
CN108672941A (en) * 2018-05-03 2018-10-19 合肥江航飞机装备有限公司 The method of laser scoring Quick Response Code

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTV20090184A1 (en) * 2009-09-24 2011-03-25 Cielle S R L LASER ENGRAVING MACHINE AND METHOD TO ADJUST THE POWER OF A LASER RAY IN THE SAME LASER ENGRAVING MACHINE

Also Published As

Publication number Publication date
DE2443334A1 (en) 1975-03-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee