Flash tube providing a flat peak synchronized output
AssigneeProfoto AB
InventorsAnton Falk, Ulf Carlsson, Carl Johan Grubbström
Life of this patent
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Abstract
Flash tubes for photographic use, in particular, a flash tube is adapted to provide a light output adapted to FP-sync, Flat Peak. The flash tube includes a length of glass tubing enclosing a gas for use in the flash tube, a cathode inside a first end part of glass tubing and an anode inside a second end part of glass tubing. The cathode includes an element that helps to ionize the gas that is wound around the cathode, such that a spark stream starts from the upper part of the cathode and is prevented from spreading down wards on the cathode and changing the arc length during the light output adapted to FP-sync.
Claims20
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.
A flash tube adapted to provide a light output, 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 wound around the cathode, the element configured to facilitate gas ionization for providing the light output,
- 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 the first section and the second section are formed from a monolithic material of the element.
A flash tube adapted to provide a light output, 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 wound around the cathode, the element configured to facilitate gas ionization for providing the light output,
- 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 a gap is provided between the first section and the second section without cross sections of the element being in contact at the gap.
Dependencies are inferred from the claim text.