US Pat. No. 9,426,870

GENERATOR FOR A FLASH DEVICE AND A METHOD IN A GENERATOR FOR A FLASH DEVICE

PROFOTO AB, Sundbyberg (...

1. A generator for a flash device comprising:
at least a first capacitor bank comprising at least one capacitor of a first type, said first capacitor bank being connectable
to a charger via a first switch; said first capacitor bank being further connected to an output via a first component which
only allows current flow from the first capacitor bank to the output;

at least a second capacitor bank comprising at least one capacitor of a second type connectable to said charger via a second
switch; said second capacitor bank being further connected to the output via a second component which only allows current
flow from the second capacitor bank to the output;

wherein said generator is configured to individually control said first switch and said second switch so that said first capacitor
bank and said second capacitor bank can be individually charged to the same or different voltages, wherein the first capacitor
bank has a first discharge characteristics and the second capacitor bank has a second discharge characteristics, wherein the
first discharge characteristics is different from the second discharge characteristics;

a flash trigger switch connected to a trigger output for providing a trigger voltage to a flash device connectable to the
generator.

US Pat. No. 9,420,675

DRIVER CIRCUIT FOR A FLASH TUBE

PROFOTO AB, Sundbyberg (...

1. A driver circuit for a flash tube comprising:
a first and a second output for an electronic flash tube;
a capacitor;
an inductor;
a switch;
said inductor and said switch being connected in series with said first and said second output across said capacitor;
a component which only allows current flow in one direction connected across said first and said second output and said inductor,
with a polarity opposite to a direction of energy supply from said capacitor to said first output;

a controller for controlling said switch, said controller comprising receiving means for receiving parameters related to desired
flash characteristics, said parameters comprising a desired color temperature, a desired flash time and a flash energy, and
said controller being configured to control said switch based on said parameters to obtain said desired flash characteristics

wherein said controller is further configured to:
switch said switch on and off in repetitive duty cycles during said flash time,
increase the duty cycles to achieve a higher color temperature and to decrease the duty cycles to achieve lower color temperature,
and

increase the flash time if the same energy level is desired at a lower color temperature and to decrease the flash time if
the same energy level is desired at a higher color temperature.

US Pat. No. 10,349,504

FLASH GENERATOR FOR A FLASH TUBE

PROFOTO AB, Sundbyberg (...

1. A flash generator for providing a power supply to a flash tube so that the flash tube rapidly provides a light output adapted to FP-sync, Flat Peak, comprising:a capacitor bank;
an output;
a switch configured to switch a current flow from the capacitor bank via the output to provide a variable power via the output;
a controller for controlling the switch, whereby by controlling the on time of the switch the generator is operative to: provide during a time period of 100 to 2000 ?s, during a peak time period within the time period an average power at least 4 times higher than the average power provided during the other time period within the time period;
whereby the flash tube during the peak time period becomes fully ignited; and
wherein a stable light output adapted to FP sync is generated during the average power provided during the other time period within the time period.

US Pat. No. 10,085,092

FLASH HEAD AND EXTENSION CABLE WITH IDENTIFICATION ELECTRONICS AND A FLASH GENERATOR

PROFOTO AB, Sundbyberg (...

1. A flash head connectable to a flash generator for providing a power supply to the flash head, the flash head comprising:a connection that receives power supply or signals from the flash generator; and
a component connected to the connection, the component being arranged so that with a known current or voltage supplied to the connection, the flash head can be identified via a voltage UID created over the component.

US Pat. No. 10,044,941

METHOD, TRANSMISSION UNIT, SYSTEM AND COMPUTER PROGRAM FOR WIRELESS COMMUNICATION BETWEEN A CAMERA AND AT LEAST ONE REMOTE FLASH DEVICE

PROFOTO AB, Sundbyberg (...

1. A method for adjusting a power relation between a plurality of different remote flash devices using through-the-lens (TTL) flash control and an intermediate radio transmission unit for wireless transmission of radio signals to the remote flash devices and for bi-directionally exchanging signals with a camera via a physical connection between the intermediate radio transmission unit and the camera, the method comprising the steps of:receiving information or setting by the respective remote flash devices the amount of power that the remote flash devices should use for their respective preflashes;
transmitting from the camera to the intermediate radio transmission unit a preflash activation signal;
emitting at the same point in time from the respective remote flash devices preflashes with a power relation according to the information or setting received by the remote flash devices;
initiating in the camera a preflash image analysis;
determining in the camera one common amplification to be applied during subsequent main flashes from all of the different remote flash devices based on the preflash image analysis, wherein the one common amplification to be applied to the amount of power received by the respective preflashes results in the respective power to be applied during the subsequent main flashes from the different remote flashes;
transmitting, from the camera via the intermediate radio transmission unit to the remote flash devices, the amplification for the remote flash devices to apply during the main flash;
transmitting, from the camera via the intermediate radio transmission unit to the remote flash devices, a main flash activation signal;
applying in the remote flash devices the one common amplification to the power for the respective preflashes; and
emitting at the same point in time from the respective remote flash devices main flashes with a power relation corresponding to the power relation for the preflashes,
wherein the information or setting received by the respective remote flash devices about the amount of power that the remote flash devices should use for their respective preflash are set in intermediate radio transmission unit.

US Pat. No. 9,917,995

METHOD, TRANSMISSION UNIT, SYSTEM AND COMPUTER PROGRAM FOR WIRELESS COMMUNICATION BETWEEN A CAMERA AND AT LEAST ONE REMOTE FLASH DEVICE

PROFOTO AB, Sundbyberg (...

1. A method for controlling settings of at least one remote flash device and for synchronizing its function to image acquisition
of a camera, using an intermediate radio transmission unit for wireless transmission of radio signals to the remote flash
device and for bi-directionally exchanging signals with the camera via a physical connection between the intermediate radio
transmission unit and the camera, the method comprising the steps of:
the camera transmitting to the intermediate radio transmission unit a preflash activation signal, wherein a predetermined
delay associated with the camera is retrieved before or at the point in time when the preflash activation signal is transmitted,

wherein an indication that the remote flash device is either unavailable or available is realized by an acknowledgement signal
from the intermediate radio transmission unit, the acknowledgement signal delayed for a certain time period so as to effect
the timing of the camera,

the intermediate radio transmission unit starting a timer causing a delay, which delay together with a subsequent time period
for forwarding the preflash activation signal to the remote flash device and another subsequent time period for the remote
flash device to receive and transform the preflash activation signal into emission of light energy, the delay together with
subsequent time periods being adapted to coincide in time with the predetermined delay between the point in time when the
camera transmits the preflash activation signal and the point in time when the camera initiates a preflash image analysis,

in dependence on the preflash image analysis, determining settings to be applied during a subsequent main flash,
transmitting, from the camera via the intermediate radio transmission unit to the remote flash device, settings for the remote
flash device to apply during a main flash, and

transmitting, from the camera via the intermediate radio transmission unit to the remote flash device, a main flash activation
signal upon which the main flash and image acquisition occurs.

US Pat. No. 10,310,360

FLASH TUBE PROVIDING A FLAT PEAK SYNCHRONIZED OUTPUT

PROFOTO AB, Sundbyberg (...

1. A flash tube adapted to provide a light output adapted to FP-sync, Flat Peak, the flash tube comprising:a length of glass tubing enclosing a gas for use in the flash tube;
a cathode fastened inside a first end part of the glass tubing;
an anode fastened inside a second end part of the glass tubing; and
an element arranged inside the first end part of the glass tubing and wound around the cathode, the element configured to facilitate gas ionization, such that a spark stream starts from an upper part of the cathode and is prevented from spreading downwards on the cathode and changing the arc length during the light output adapted to FP-sync,
wherein the element is unevenly wound around the cathode in sections with different pitch,
wherein the element comprises a first section wherein the element is wound around the cathode with a tight pitch and a second section wherein the element is wound around the cathode with a loose pitch relative to the tight pitch of the first section, and
wherein there is a gap provided between the first section and the second section where the element is wound around at least a part of the cathode with an even looser pitch relative to the loose pitch of the second section.

US Pat. No. 10,197,250

SUPPORT RING FOR MOUNTING OF A SOFT BOX ON A LIGHT SOURCE

PROFOTO AB, Sundbyberg (...

1. A support ring for mounting of a soft box on a light source, the support ring comprising:an attachment wall configured to attach the support ring to the light source, the attachment wall at least partially forming an attachment wall opening within which the light source is configured to be positioned; and
at least one cavity formed at least partially by the attachment wall, the cavity separate from the attachment wall opening, the cavity configured to receive a support pin of the soft box, the cavity comprising:
a first support element and a second support element at least partially forming the cavity, the first and second support elements arranged to counteract a torque from the support pin with the support pin in an inserted position in the cavity; and
at least one entry element at least partially forming the cavity, the at least one entry element arranged on a radial outside of the cavity and arranged to counteract a force required to bend the support pin to an angle where the support pin can be inserted into the cavity.

US Pat. No. 10,375,315

METHOD, TRANSMISSION UNIT, SYSTEM AND COMPUTER PROGRAM FOR WIRELESS COMMUNICATION BETWEEN A CAMERA AND AT LEAST ONE REMOTE FLASH DEVICE

PROFOTO AB, Sundbyberg (...

1. A method for adjusting a power relation between a plurality of different remote flash devices using through-the-lens (TTL) flash control and an intermediate radio transmission unit for wireless transmission of radio signals to the remote flash devices and for bi-directionally exchanging signals with a camera via a physical connection between the intermediate radio transmission unit and the camera, the method comprising the steps of:receiving information or setting by the respective remote flash devices the amount of power that the remote flash devices should use for their respective preflashes;
receiving by the respective remote flash devices a preflash activation signal received from the camera via the intermediate radio transmission unit;
emitting at the same point in time from the respective remote flash devices preflashes with a power relation according to the received information or setting received by the remote flash devices, wherein the power relation is adjusted between the plurality of different remote flash devices using through-the-lens (TTL) flash control;
receiving by the remote flash devices one common amplification based on the preflashses to be applied during subsequent main flashes from all of the different remote flash devices, said one common amplification from the camera via the intermediate radio transmission unit;
receiving by the remote flash devices a main flash activation signal from the camera via the intermediate radio transmission unit;
applying in the remote flash devices the one common amplification to the power for the respective preflashes; and
emitting at the same point in time from the respective remote flash devices main flashes with a power relation corresponding to the power relation for the preflashes.

US Pat. No. 10,455,130

METHOD, TRANSMISSION UNIT, SYSTEM AND COMPUTER PROGRAM FOR WIRELESS COMMUNICATION BETWEEN A CAMERA AND AT LEAST ONE REMOTE FLASH DEVICE

PROFOTO AB, Sundbyberg (...

18. A method for controlling flash power of at least one remote flash device and for synchronizing preflash occurrence with measurement using a camera at a point in time when light is captured, the method comprising the steps of:the camera transmitting to an intermediate radio transmission unit a preflash activation signal,
the intermediate radio transmission unit starting a timer causing a delay, which delay together with a subsequent time period for forwarding the preflash activation signal to the remote flash device and another subsequent time period for the remote flash device to receive and transform the preflash activation signal into emission of light energy, the delay together with subsequent time periods being adapted to coincide in time with a predetermined delay between the point in time when the camera transmits the preflash activation signal and the point in time when the camera initiates capture of the light emitted as a preflash by the remote flash device coinciding with the predetermined delay, and
in dependence on preflash image analysis based on the captured light, determining a flash power change to be applied during a main flash subsequent the preflash.

US Pat. No. 10,602,594

DRIVE CIRCUIT FOR A FLASH TUBE AND A METHOD FOR CONTROLLING THE DRIVE CIRCUIT

PROFOTO AB, Sundbyberg (...

1. A drive circuit for a flash tube comprising:a capacitor;
a first inductor switch group comprising a first inductor and
at least one first switch connected in series with each other, the first inductor switch group being configured to be connected in series with the flash tube and the capacitor;
a control unit comprising receiving means for receiving at least one input parameter related to a desired flash characteristics; and
a second inductor switch group comprising a second inductor and a second switch connected in series with each other,
the second inductor switch group being configured to be connected in series with the flash tube and the capacitor, and being connected in parallel with the first inductor switch group,
wherein the control unit is configured to control the first and second inductor switch groups separately based on the at least one input parameter to obtain the desired flash characteristics, and
wherein each inductor switch group is associated with a preset maximum current, the control unit being configured to, based on the input parameter:
determine a flash current required to be fed to the flash tube in order to achieve the desired flash characteristics,
determine, based on the determined flash current, a switch algorithm used to ensure that no individual inductor switch group has to carry an electric current exceeding the preset maximum current of that inductor switch group, and
use the determined switch algorithm to feed the flash current to the flash tube.