Examples described herein relate to a system consistent with the disclosure. For instance, the system may comprise a printing device including hardware to form an image on a print medium, a memory resource, and a controller to receive a print job to form the markings on the print medium, designate a pixel of the received print job to form a covert dot pattern on the markings, where the pixel corresponds to a first laser intensity level; and adjust a laser intensity of the printing device to a second laser intensity level based on the first laser intensity level of the designated pixel to form the covert dot pattern.

A laser marking system comprises at least one controller to control an array of optical devices, between a laser source and a scan head. The array applies a selected pattern of portions of the received spatial profile of the laser beam to the substrate to achieve a second intensity different from the first intensity of laser beam at a rate of power deposition relative to a rate of thermal diffusion in the substrate for a predetermined time interval to thermally heat locations of the substrate with the selected pattern of the portions. The second intensity effectuates carbonization of materials of the substrate to create a mark without ablation.

A layer transferring device includes: a main casing having an opening and accommodating a heat roller, a motor, and a first transmission gear therein; a film cartridge; and a cover at which a pressure roller and a second transmission gear is provided and movable about a pivot axis to open and close the opening. The heat roller is movable toward and away from the pressure roller when the cover is closed. When the film cartridge is attached to the main casing and the cover is closed, the multilayer film contacts and passes through between the pressure roller and the heat roller. When the cover is closed, the first transmission gear for receiving a driving force from the motor and the second transmission gear for transmitting a driving force to the pressure roller are positioned between the pivot axis and the heat roller and in meshing engagement with each other.

Provided is light irradiation method for irradiating a light absorbing material with light beam having wavelength absorbable by light absorbing material, including applying to light absorbing material, energy that enables light absorbing material to fly, by pressure in a vaporized region higher than or equal to outside pressure, wherein vaporized region is present at interface between a transparent body and light absorbing material in a manner to surround an optical axis. Also provided is flying body generating method including irradiating a surface of a base material opposite to a surface over which light absorbing material is disposed with laser beam to fly light absorbing material in an emitting direction of laser beam, wherein vaporized region having pressure higher than or equal to outside pressure is generated along outer circumference of a region irradiated with laser beam at interface between base material and light absorbing material.

A security document may include a laserizable first layer including a grayscale image formed by laserizing; a color pattern that is in alignment with the grayscale image; and a second layer arranged between the first layer and the pattern, such that the first layer is above the second layer, and the pattern is below the second layer. The second layer may be more opaque than the first layer, such that when observing the security document from the top, the grayscale image appears to be colored by the color pattern only when the bottom of the security document is being illuminated.

An apparatus for marking electric devices which can be arranged next to one another and mounted on a support rail includes a receptacle for the support rail and a laser head for applying a marking to the electric devices. The receptacle is mounted for pivotal movement about its longitudinal axis and the laser head is guided for movement in at least one longitudinal direction parallel to the longitudinal axis of the receptacle.

Embodiments of a method and system for applying patterns on the surfaces of articles and inspecting the patterns are disclosed. A laser irradiation system has a laser transmission element, irradiation zone and irradiation inspection element. A set of articles is positioned within the irradiation zone and irradiated with laser energy from the transmission element during an irradiation period. The irradiation causes interactions between a beam and the article surfaces which transiently generate localized illuminations at the article surfaces during the interactions. The interactions also collectively form post-irradiation patterns in the article surfaces that persist after the interactions. An irradiation inspection image of the irradiation zone is captured during the irradiation period by the irradiation inspection element. The irradiation inspection image includes illumination patterns defined by the localized illuminations. If an illumination pattern fails to match the corresponding target pattern to which it is compared, the respective article is rejected.

The invention relates to a method for applying a marking within a marking area on an object, in which at least one light beam is emitted with light emitting means, scanning means are moved to deflect the light beam line by line over the marking area, while the light emitting means is switched between being activated or deactivated according to the marking to be applied. The method is characterized in that, for each start of a line movement of the light beam over the object, the scanning means is moved such that its deflection direction points at a line starting point outside the marking area and the scanning means is accelerated such that its deflection direction is accelerated from the line starting point towards the marking area, wherein the light emitting means is deactivated while the deflection direction points somewhere outside the marking area. The invention further relates to a corresponding marking apparatus.

The invention relates to a method for applying a marking within a marking area on an object, in which at least one light beam is emitted with light emitting means, scanning means are moved to deflect the light beam line by line over the marking area, while the light emitting means is switched between being activated or deactivated according to the marking to be applied. The method is characterized in that, for each start of a line movement of the light beam over the object, the scanning means is moved such that its deflection direction points at a line starting point outside the marking area and the scanning means is accelerated such that its deflection direction is accelerated from the line starting point towards the marking area, wherein the light emitting means is deactivated while the deflection direction points somewhere outside the marking area. The invention further relates to a corresponding marking apparatus.

There is described a metal workpiece generally having a surface and an identifier marked on said surface. The identifier has cells each having a corresponding cell size, including bright cells corresponding to a first binary value and dark cells corresponding to a second binary value different from the first binary value. The dark cells include a center portion being recessed relative to the surface thereby leaving a recess bounded by a peripheral wall in the corresponding dark cell, the recess having a depth of at least 100 microns and having an opening with a width ranging between 400 microns and 1750 microns and representing between 30 percent and 99 percent of the corresponding cell size such that the corresponding dark cell appears dark to an optical reader. The depth, the width and the cell size of the dark cells provide a shot blast resistance to the laser-marked identifier.