WO2019054938A1 - A flash housing for emitting flash light for photographic purposes and a method performed in a flash housing - Google Patents

A flash housing for emitting flash light for photographic purposes and a method performed in a flash housing Download PDF

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Publication number
WO2019054938A1
WO2019054938A1 PCT/SE2018/050949 SE2018050949W WO2019054938A1 WO 2019054938 A1 WO2019054938 A1 WO 2019054938A1 SE 2018050949 W SE2018050949 W SE 2018050949W WO 2019054938 A1 WO2019054938 A1 WO 2019054938A1
Authority
WO
WIPO (PCT)
Prior art keywords
flash
light
housing
semi
wavelengths
Prior art date
Application number
PCT/SE2018/050949
Other languages
French (fr)
Inventor
Peter Pinzke
Emil STENBACKA
Original Assignee
Profoto Aktiebolag
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 Profoto Aktiebolag filed Critical Profoto Aktiebolag
Publication of WO2019054938A1 publication Critical patent/WO2019054938A1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0514—Separate unit
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0589—Diffusors, filters or refraction means
    • G03B2215/0592—Diffusors, filters or refraction means installed in front of light emitter

Definitions

  • the present disclosure relates to a flash housing for emitting flash light for
  • a flash device In order to be able to take photographs of a certain quality a flash device is often used to provide light to or to improve the light in the photograph.
  • One of the problems with flash devices which are used many times within a short period of time is that a large amount of heat is developed by the emissions of flash lights. This heat may cause damage to the flash parts.
  • One way to prevent damage to the flash parts is to install a fan system which transports the heat away from the flash device by means of an airflow.
  • a fluid may be used in order to transport the heat away.
  • the flash housing is too small to fit an efficient fan system or similar.
  • the parts of the flash device are so close to each other, the parts of the flash device are exposed to more heat than the parts of larger flash devices.
  • One way to deal with the heat problem is to limit the number of flashes emitted during a certain period of time.
  • there may be a time restriction between the emissions of flashes during which time restriction a flash cannot be emitted.
  • a flash may not be emitted until a predetermined time has passed since the previous flash was emitted.
  • these time restrictions may cause problems when a photographer is using the flash device.
  • there is a need for a flash device where the time restrictions are as small as possible.
  • there is a need for a flash device which functions without the risk of causing damage to the flash parts due to the emitted heat.
  • a flash housing for emitting flash light for photographic purposes.
  • the flash housing comprises: a flash forming element arranged to generate a flash light; and a lens element arranged to let at least part of the generated flash light out of the flash housing, wherein the flash housing further comprises a semi-transparent element arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element.
  • the flash housing or a flash device comprising the flash housing is typically a small device such as an external flash device connectable to a camera.
  • the flash housing or the flash may act both as an on-camera flash and as an off-camera flash.
  • the off- camera flash may be adapted to communicate, possibly, wirelessly, with the camera.
  • the semi-transparent element is an optical filter which is arranged to only transmit light of certain wavelengths generated by the flash forming element. According to one aspect, all of the light of a predetermined second
  • wavelengths is absorbed and/or reflected by means of the semi-transparent element.
  • a part of the heat emitted from the flash tube will not be transmitted through the semi-transparent element and hence, the flash housing and the lens element can be protected from part of a peak of heat energy that is generated as the flash light is emitted.
  • Intense peaks of heat energy may damage the flash housing parts, especially the lens element.
  • intense peaks of heat energy may damage any flash shaping tools attached to the flash housing. Due to the reduction of the exposure to intense peaks of heat energy on parts of the flash housing and possibly also flash shaping tools, the time restrictions on the flash may be reduced, and hence, a user friendly flash device is achieved.
  • light of predetermined first wavelengths is visible light and light of predetermined second wavelengths is non-visible light.
  • a flash light emits light in a wide range of wavelengths.
  • other light such as IR light and UV light is emitted during the flash.
  • light which is not within the visual range does not contribute to the photograph.
  • by not transmitting light of wavelengths which are not visible the quality of the photograph is not affected.
  • to not transmit light of wavelengths which are not visible does affect the amount of heat transmitted through the semi- transparent element.
  • a flash device wherein the flash forming element comprises: a flash tube; and a reflector.
  • the flash forming element comprises a lamp and a reflector.
  • a flash tube enables emitting a flash light of high intensity which often is desired when taking a photograph.
  • the semi-transparent element is arranged in the light path between the flash forming element and the lens element.
  • the semi-transparent element is arranged in close vicinity of the reflector.
  • the lens element is made of plastic, and hence is affected by a certain amount of heat, especially by intense peaks of heat energy. By placing the semi-transparent element in the light path between the flash forming element and the lens element, the lens element is protected from intense peaks of heat energy as the flash light is emitted from the flash forming element.
  • the lens element may be kept intact, forming a user friendly, reliable and safe flash device.
  • a flash shaping tool attached to the flash housing is protected from damaging intense peaks of heat energy.
  • the flash forming element is accommodated in a holding element wherein said semi-transparent element and the holding element form a chamber, in which the flash forming element is located, wherein the peak of the heat energy emitted from said chamber is lower than the peak of the heat energy emitted from the flash forming element during a flash light.
  • the semi-transparent element reflects and/or absorbs part of predetermined second wavelengths generated by the flash forming element.
  • a certain amount of the heat energy generated by the flash tube during a flash light will be absorbed by the semi-transparent element and/or by the holding element and/or the flash tube and/or the reflector, all being parts of the chamber.
  • the peak of heat energy generated by the emitted flash light which is transmitted through the semi-transparent element will be lower or less intense than if the semi-transparent element was not there.
  • the lens element is protected from intense peaks of heat energy generated by the emitted flash light.
  • the parts forming the chamber and the parts within the chamber will absorb heat energy, and then release this heat energy over time.
  • a peak of heat energy will be emitted from the chamber.
  • the intensity of the peak of heat energy emitted from the chamber will be lower than the intensity of the peak of heat energy emitted from the flash forming element.
  • the flash forming element within the chamber as well as the holding element and the semi-transparent element forming the chamber are resistant to heat and will be able to withstand the peaks of heat energy caused by the flash light emitted from the flash tube as well as by the reflection and/or absorption of part of the flash light emitted from the flash tube.
  • the chamber is a first internal chamber located in the housing, and wherein the housing comprises a second chamber externally of the first internal chamber, wherein the peak of the heat energy emitted from said first internal chamber to the second chamber is lower than the peak of the heat energy emitted from the flash forming element during a flash light.
  • the first internal chamber is thus formed by formed by the holding element and the semi-transparent element as described above, and the second chamber may be formed by the inner walls of the flash housing and the lens element.
  • the semi-transparent element is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 700 nm and 2000 nm. According to one embodiment, the semi-transparent element is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 600 nm and 2000 nm.
  • a semi-transparent element which reflects and/or absorbs at least part of light of certain wavelengths such as light of predetermined second wavelengths between 700 nm and 2000 nm, also called IR-light
  • the photograph is not affected. However, by reflecting and/or absorbing part of the heat emitted from the flash forming device, parts of the flash housing are protected from intense peaks of heat energy that may damage said parts.
  • the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 700 nm and 2000 nm.
  • the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 600 nm and 2000 nm.
  • the semi-transparent element is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 10 nm and 400 nm. According to one embodiment the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 10 nm and 400 nm.
  • a semi-transparent element which reflects and/or absorbs at least part of light of certain wavelengths such as light of predetermined second wavelengths between 10 nm and 400 nm, also called UV-light
  • the photograph is not affected.
  • parts of the flash housing are protected from intense peaks of heat energy that may damage said parts.
  • the semi-transparent element reflects and/or absorbs at least a part of light of predetermined wavelengths between 10 nm and 400 nm and 700 nm and 1000 nm.
  • the semi-transparent element reflects and/or absorbs at least a part of light of predetermined wavelengths between 10 nm and 400 nm and 700 nm and 2000 nm. According to one embodiment, the semi-transparent element is further arranged to reflect and/or absorb a part of the light of predetermined first wavelengths between 400-700 nm to adjust the colour temperature of the flash light.
  • the semi-transparent element in addition to absorbing and/or reflecting light of a predetermined second wavelength, may be arranged to reflect and/or absorb a part of the light of a predetermined first wavelength, which according to one aspect is visible light.
  • a predetermined first wavelength which according to one aspect is visible light.
  • the colour temperature of the transmitted flash light is affected.
  • To change the colour temperature of a flash light may be desirable in order to be able to enhance the quality of a certain photograph.
  • a user friendly flash device is achieved by allowing an adjustment of the colour temperature of the flash light as well as protecting parts of the flash housing from intense peaks of heat energy.
  • the flash forming element is movable in an axial direction inside the flash housing, and the semi-transparent element is arranged to move together with the flash forming element.
  • the semi-transparent element By placing the semi-transparent element so that it is movable along with the flash forming element in the flash housing, the semi-transparent element will efficiently reflect and/or absorb flash light of certain wavelengths at all times. A user friendly and safe flash device is achieved. According to one embodiment, the semi-transparent element is placed in close vicinity of the flash forming element.
  • the semi-transparent element is made of glass.
  • a material not sensitive to the heat from a flash tube such as glass, a reliable and user friendly flash device is achieved, The semi-transparent element will not be negatively affected by heat and hence will have a long lifetime.
  • the semi-transparent element is made of glass with a coating. According to one embodiment, the semi-transparent element is made of glass where the glass material itself has the desired properties.
  • a method performed in a flash housing for emitting flash light for photographic purposes comprises the steps of: generating a flash light by a flash forming element; transmitting light of predetermined first wavelengths of the generated flash light through a semi-transparent element and reflecting and/or absorbing at least part of light of predetermined second wavelengths of the generated flash light by the semi-transparent element into a chamber formed by the semi-transparent element (5) and a holding element (8) which holding element accommodates the flash forming element, and in which chamber the flash forming element is located, and letting the transmitted light out of the flash housing.
  • the peak of the heat energy emitted from the chamber is lower than the peak of the heat energy emitted from the flash forming element during a flash light.
  • Figure 1 schematically illustrates a flash device according to different embodiments.
  • Figure 2 schematically illustrates a flash housing according to different
  • Figure 3 schematically illustrates parts of a flash housing according to different embodiments.
  • Figure 4 schematically illustrates parts of a flash housing according to different embodiments.
  • Figure 5 is a flow chart illustrating an example of a method for emitting a flash light beam lobe for photographic purposes.
  • FIG. 1 illustrates a flash device 1 according to one example.
  • the flash device 1 is arranged to be used for photographic purposes.
  • the flash device 1 is arranged to be releasably attachable to a camera.
  • the flash device 1 comprises in the illustrated example a flash holder 20 and a flash housing 2 hinged onto the flash holder 20.
  • the flash device further comprises a releasable battery 30, attached to the flash holder 20.
  • the flash housing is equipped with a lens element 3 arranged to affect the generated flash light in a desired way.
  • the flash housing is arranged to emit a beam lobe 100 of flash light.
  • the beam lobe of the flash light has an essentially circular cross section x and a beam angle a.
  • the beam angle a of the flash light beam lobe 100 is according to one embodiment adjustable.
  • FIG. 2 schematically illustrates a cross section of a flash housing 2, used for photographic purposes, viewed from above.
  • the flash housing 2 is arranged to emit a beam lobe 100 of flash light.
  • the flash housing 2 comprises a flash tube 9 partly enclosed by a reflector 4.
  • an alternative flash forming element may be used, for example a lamp and a reflector.
  • the flash tube 9 is in the illustrated example straight.
  • the flash tube may instead have another shape.
  • the reflector 4 has in the illustrated example an essentially oval cross section.
  • the reflector 4 is three dimensional and of a parabola shape.
  • the reflector 4 is arranged to reflect at least part of the flash light emitted from the flash tube 9 in order to direct substantially all of the flash light generated by or emitted from the flash tube 9 towards a lens element 3.
  • the reflector 4 is arranged to reflect at least part of the flash light in order to make the cross section x of the reflected part of the flash light beam lobe directed towards the lens element 3 as circular as possible, given the available space and construction of the flash housing 2 and the components within the flash housing 2.
  • the cross section x of the flash light beam lobe is a cross section x taken in a direction perpendicular to the direction of the light.
  • the reflector 4 and the flash tube 9 are in the illustrated example arranged in a holding element 8.
  • the holding element 8 may be made of a material which is heat resistant, for example ceramics, glass, metal or similar.
  • the holding element 8 is in the illustrated example arranged in a carrier 7 which is movably attached to the flash housing 2 by means of a number of guiding elements (not disclosed).
  • the carrier 7 is arranged to be axially movable inside the flash housing
  • a positioner 6 positions the carrier 7 axially in the flash housing 2.
  • the positioner comprises a step motor. The position of the carrier 7 and thereby the flash tube 9 and the reflector 4 affects a beam angle a of the emitted beam lobe 100.
  • the beam angle a of the beam lobe 100 is a maximum beam angle for the beam lobe 100 of the emitted flash light.
  • the beam angle a of the beam lobe 100 is a minimum beam angle a for the beam lobe 100 of the emitted flash light.
  • the lens element 3 is arranged to let at least part of the flash light generated by the flash tube 9 and the reflector 4 out of the flash housing 2. Ideally, all of the light generated by the flash tube 9 and the reflector 4 is emitted from the flash housing 2. However, some of the flash light may be absorbed by the inner walls of the flash housing 2 etc.
  • the lens element 3 comprises an outer surface 3a and an inner surface 3b, wherein the respective surfaces 3a, 3b affect the flash light differently.
  • the flash housing 2 further comprises a semi-transparent element 5 arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element.
  • the semi-transparent element 5 is arranged in the light path between the flash tube 4 and the lens element 3. According to the illustrated embodiment, the semi-transparent element 5 is attached to the holding element 8, in close vicinity to the flash forming element 4, 9. With this placement of the semi-transparent element 5 only the flash light of desired wavelengths will be transmitted through the semi-transparent element 5 and hit the lens element 3. According to one embodiment not illustrated, the placement of the semi-transparent element 5 is a position at a distance from the reflector 3, in the light path between the flash tube 4 and the lens element 3.
  • the flash forming element 4, 9 is
  • the holding element 8 is made of ceramics or glass or metal or another heat resistant material.
  • the chamber formed by the holding element 8 and the semi-transparent element 5 will according to the described embodiment be exposed to a large amount of heat.
  • the chamber in which the flash forming element is located is a first internal chamber located in the housing 2, and the housing comprises a second chamber externally of the first internal chamber, wherein the peak of the heat energy emitted from said first internal chamber to the second chamber is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light.
  • the first internal chamber is thus formed by formed by the holding element 8 and the semi-transparent element 5 as described above, and the second chamber is formed by the inner walls of the flash housing 2 and the lens element 3.
  • said semi-transparent element 5 is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 700 nm and 2000 nm.
  • the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 700 nm and 2000 nm.
  • IR-light By reflecting and/or absorbing at least part of the light of predetermined second wavelengths between 700 nm and 1000 nm, at least part of IR-light emitted from the flash tube 9 is absorbed and/or reflected. IR-light does not form part of the visible light, and hence, to absorb and/or reflect light of these wavelengths do not affect quality of the photograph.
  • the semi-transparent element 5 is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 10 nm and 400 nm.
  • the semi-transparent element 5 is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 10 nm and 400 nm. By reflecting and/or absorbing at least part of the light of predetermined second wavelengths between 10 nm and 400 nm, at least part of UV-light emitted from the flash tube 9 is absorbed and/or reflected. UV-light does not form part of the visible light, and hence, to absorb or reflect light of these wavelengths do not affect quality of the photograph.
  • the semi-transparent element 5 is further arranged to reflect and/or absorb a part of the light of predetermined first wavelengths between 400-700 nm to adjust the colour temperature of the flash light.
  • the colour temperature of flash light used when taking the photo is an important factor. Often, the colour temperature of flash light is too high for an optimal photograph to be taken. By adjusting the colour temperature of a flash light an even better photograph can be taken.
  • the semi- transparent element 5 is provided with a coating for adjusting the colour temperature of the light transmitted through said semi-transparent element 5.
  • the material in the semi-transparent element 5 itself is arranged to adjust the colour temperature of the light transmitted through said semi-transparent element 5.
  • the semi-transparent element 5 is made of glass.
  • the semi-transparent element 5 is made of another heat resistant material.
  • the semi-transparent element 5 is according to one embodiment arranged to absorb and/or reflect all of the light of certain second wavelengths.
  • the semi-transparent element 5 is arranged to absorb and/or reflect a part of the light of certain second wavelengths. According to one embodiment, the semi-transparent element 5 is made of glass with a coating.
  • the semi-transparent element is made of glass wherein the glass material itself gives the semi-transparent element its characteristics.
  • a method performed in a flash housing 2 for emitting flash light for photographic purposes comprises the steps of: generating a flash light; transmitting light of predetermined first wavelengths of the generated flash light and reflecting and/or absorbing at least part of light of
  • the peak of the heat energy emitted from a chamber formed by a holding element 8 and a semi-transparent element 5, said chamber enclosing the flash forming element 4, 9, is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light.
  • the flash forming device 4, 9 is movable in an axial direction inside the flash housing 2 and the semi-transparent element 5 is arranged to move together with the flash forming element 4, 9. By moving the flash forming device 4, 9 in the flash housing 2, the beam angle of the emitted beam lobe of flash light is varied, and hence, the user is able to adjust the beam lobe of flash light for each photograph if desired.
  • the flash forming device 4, 9 is arranged in the holding element 8, and the semi-transparent element 5 is attached to the holding element.
  • the holding element 8 is in the illustrated example arranged in a carrier 7.
  • the carrier 7 is movably attached to the flash housing 2 by means of a number of guiding elements (not disclosed).
  • the carrier 7 is arranged to be axially movable inside the flash housing 2.
  • a positioner 6 positions the carrier 7 axially in the flash housing 2.
  • the positioner comprises a step motor. The position of the carrier 7 and thereby the flash tube 9 and the reflector 4 affects a beam angle a of the emitted beam lobe 100.
  • the beam angle a of the beam lobe 100 is a maximum beam angle for the beam lobe.
  • the beam angle a of the beam lobe 100 is minimum beam angle for the beam lobe.
  • Figure 3 schematically illustrates an example of the design of a flash forming element 4, 9 arranged to generate a flash light, the holding element 8, the carrier 7 and the semi- transparent element 5.
  • the flash forming element comprises a flash tube 9 partly enclosed by a reflector 4.
  • an alternative flash forming element may be used, for example a lamp and a reflector.
  • the flash tube 9 is in the illustrated example elongated.
  • the flash tube 9 is in the illustrated example straight.
  • the flash tube may instead have another shape.
  • small flash devices such as a flash device which is removably attachable to a camera, the volume within which the flash tube 9 is fitted is limited. It is often difficult to create a small flash tube of a different shape than a straight tube, such as a horse shoe shape etc.
  • the reflector 4 may have some or all of the characteristics of the reflector as discussed in relation to figure 2.
  • a semi-transparent element 5 is further arranged in the beam path after the flash forming element 4, 9.
  • the semi-transparent element 5 is arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element 4, 9.
  • the reflector 4, the flash tube 9 and the semi-transparent element 5 are in the illustrated example arranged in or on a holding element 8.
  • the holding element 8 may be made of a materia! which is heat resistant, for example ceramics, glass, metal or similar.
  • the holding element 8 and the semi-transparent element 5 form a chamber which encloses the flash tube 9 and the reflector 4.
  • the peak of the heat energy emitted from the chamber is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light.
  • the parts 5, 8 forming the chamber and the flash tube 9 and the reflector 4 are characteristically heated. All the parts of the chamber and within the chamber can characteristically withstand high temperatures.
  • the peak of heat energy emitted from the flash tube 9 is higher than the peak of heat energy emitted from the chamber, that is, the peak of heat energy transmitted through the holding element 8 and the semi-transparent element 5. This is because part of the light is not transmitted through the semi- transparent element 5.
  • the parts of the chamber will absorb heat energy created from the reflected and/or absorbed light.
  • the heat energy will dissipate from the chamber to the surrounding until the temperature of the chamber is the same as the rest of the flash housing.
  • the mass of the holding element 8 is relatively large, allowing for a large amount of heat energy to be stored in the holding element 8.
  • the peak of heat energy emitted from the chamber during a flash light is reduced to a level which does not damage the lens element or other parts of the flash housing or accessories attached to the flash housing.
  • the holding element 8 is in the illustrated example arranged in a carrier 7.
  • the carrier is movably attached to the flash housing 2 by means of a number of guiding pins and a screw element.
  • the carrier 7 is arranged to be axially movable inside the flash housing 2.
  • a positioner 6 positions the carrier 7 axially in the flash housing 2.
  • the positioner comprises a step motor.
  • the position of the carrier 7 and thereby the holding element 8, the flash tube 9 and the reflector 4 affects a beam angle a of the emitted beam lobe of flash light 100.
  • the beam angle a of the beam lobe 100 is a maximum beam angle for the beam lobe.
  • the beam angle a of the beam lobe of flash light 100 is the minimum beam angle for the beam lobe.
  • the holding element 8 and the carrier 7 are integrated in one piece.
  • the carrier 7 has a guided nut for engagement with a screw element (not shown).
  • a screw element not shown.
  • the carrier 7 may further have at least one, in the illustrated example two, guiding pin supports 18. At least one guiding pin 19 suspended in the flash housing (not disclosed) and mounted coaxially with the screw element can then run through the guiding support(s).
  • the at least one guiding pin support 18 is formed as an opening suitable for accommodating the respective guiding pin.
  • the size of the opening is adapted to the size of the pin 19 so that the guiding pin support 18 can move freely back and forward therein but with a minimum gap.
  • Figure 4 schematically illustrates an exploded view of the carrier 7, the holding element 8, the reflector 4 the flash tube 9 and the semi-transparent element 5.
  • FIG. 5 a method for generating a flash light for photographic purposes is illustrated.
  • the method comprises a first step s1 of generating a flash light by a flash forming element.
  • the method comprises a second step of transmitting light of predetermined first wavelengths of the generated flash through a semi-transparent element 5 and reflecting and/or absorbing at least part of light of predetermined second wavelengths of the generated flash light by the semi-transparent element into a chamber formed by the semi-transparent element 5 and a holding element 8 which holding element accommodates the flash forming element, and in which chamber the flash forming element is located.
  • the method comprises a third step s3 of letting the transmitted light out of the flash housing.

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Abstract

A flash housing (2) for emitting flash light for photographic purposes is provided. The flash housing comprises: flash forming element (4), (9) arranged to generate a flash light; and a lens element (3) arranged to let at least part of the generated flash light out of the flash housing (2), wherein the flash housing (2) further comprises a semi-transparent element (5) arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element (4), (9). Further, a method performed in a flash housing (2) for emitting flash light for photographic purposes is provided. The method comprises the steps of: generating a flash light; transmitting light of predetermined first wavelengths of the generated flash light and reflecting and/or absorbing at least part of light of predetermined second wavelengths of the generated flash light, and letting the transmitted light out of the flash housing (2).

Description

A flash housing for emitting flash light for photographic purposes and a method performed in a flash housing
TECHNICAL FIELD
The present disclosure relates to a flash housing for emitting flash light for
photographic purposes and a method performed in a flash housing for emitting flash light for photographic purposes.
BACKGROUND ART
In order to be able to take photographs of a certain quality a flash device is often used to provide light to or to improve the light in the photograph. One of the problems with flash devices which are used many times within a short period of time is that a large amount of heat is developed by the emissions of flash lights. This heat may cause damage to the flash parts.
One way to prevent damage to the flash parts is to install a fan system which transports the heat away from the flash device by means of an airflow. Alternatively, a fluid may be used in order to transport the heat away.
However, for a small flash device, such as an external flash device connectable to a camera, the flash housing is too small to fit an efficient fan system or similar. In addition, since the parts of the flash device are so close to each other, the parts of the flash device are exposed to more heat than the parts of larger flash devices.
One way to deal with the heat problem is to limit the number of flashes emitted during a certain period of time. In addition, there may be a time restriction between the emissions of flashes, during which time restriction a flash cannot be emitted. In other words, a flash may not be emitted until a predetermined time has passed since the previous flash was emitted. Depending on the size of the time restrictions, these time restrictions may cause problems when a photographer is using the flash device. There are often situations when a photographer would like to use the flash device many times in a small period of time in order to be able to take several photographs in the small period of time. Hence, there is a need for a flash device where the time restrictions are as small as possible. In addition, there is a need for a flash device which functions without the risk of causing damage to the flash parts due to the emitted heat.
SUMMARY It is an object of the invention to provide a flash device which does not have limiting time restrictions on the usage. It is an object of the invention to provide a flash device which minimizes the risk of melting or damage parts due to the heat when used. It is an object of the invention to provide a safe and user friendly flash device.
According to one embodiment, a flash housing for emitting flash light for photographic purposes is provided. The flash housing comprises: a flash forming element arranged to generate a flash light; and a lens element arranged to let at least part of the generated flash light out of the flash housing, wherein the flash housing further comprises a semi-transparent element arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element.
The flash housing or a flash device comprising the flash housing is typically a small device such as an external flash device connectable to a camera. The flash housing or the flash may act both as an on-camera flash and as an off-camera flash. The off- camera flash may be adapted to communicate, possibly, wirelessly, with the camera. According to one embodiment, the semi-transparent element is an optical filter which is arranged to only transmit light of certain wavelengths generated by the flash forming element. According to one aspect, all of the light of a predetermined second
wavelength is absorbed and/or reflected by means of the semi-transparent element. According to one aspect, at least part of the light of predetermined second
wavelengths is absorbed and/or reflected by means of the semi-transparent element. By only transmitting light of certain wavelengths, a part of the heat emitted from the flash tube will not be transmitted through the semi-transparent element and hence, the flash housing and the lens element can be protected from part of a peak of heat energy that is generated as the flash light is emitted. Intense peaks of heat energy may damage the flash housing parts, especially the lens element. In addition, intense peaks of heat energy may damage any flash shaping tools attached to the flash housing. Due to the reduction of the exposure to intense peaks of heat energy on parts of the flash housing and possibly also flash shaping tools, the time restrictions on the flash may be reduced, and hence, a user friendly flash device is achieved.
According to one aspect, light of predetermined first wavelengths is visible light and light of predetermined second wavelengths is non-visible light.
A flash light emits light in a wide range of wavelengths. In addition to visual light, also other light such as IR light and UV light is emitted during the flash. In the field of photography, light which is not within the visual range does not contribute to the photograph. Hence, by not transmitting light of wavelengths which are not visible the quality of the photograph is not affected. However, to not transmit light of wavelengths which are not visible does affect the amount of heat transmitted through the semi- transparent element.
According to one embodiment, a flash device is provided, wherein the flash forming element comprises: a flash tube; and a reflector. According to one embodiment, the flash forming element comprises a lamp and a reflector.
A flash tube enables emitting a flash light of high intensity which often is desired when taking a photograph.
According to one embodiment the semi-transparent element is arranged in the light path between the flash forming element and the lens element.
According to one embodiment, the semi-transparent element is arranged in close vicinity of the reflector. According to one embodiment, the lens element is made of plastic, and hence is affected by a certain amount of heat, especially by intense peaks of heat energy. By placing the semi-transparent element in the light path between the flash forming element and the lens element, the lens element is protected from intense peaks of heat energy as the flash light is emitted from the flash forming element.
Hence, the lens element may be kept intact, forming a user friendly, reliable and safe flash device. In addition, a flash shaping tool attached to the flash housing is protected from damaging intense peaks of heat energy. According to one embodiment the flash forming element is accommodated in a holding element wherein said semi-transparent element and the holding element form a chamber, in which the flash forming element is located, wherein the peak of the heat energy emitted from said chamber is lower than the peak of the heat energy emitted from the flash forming element during a flash light.
The semi-transparent element reflects and/or absorbs part of predetermined second wavelengths generated by the flash forming element. Thereby, a certain amount of the heat energy generated by the flash tube during a flash light will be absorbed by the semi-transparent element and/or by the holding element and/or the flash tube and/or the reflector, all being parts of the chamber. Hence, the peak of heat energy generated by the emitted flash light which is transmitted through the semi-transparent element will be lower or less intense than if the semi-transparent element was not there. Hence, for example the lens element is protected from intense peaks of heat energy generated by the emitted flash light. The parts forming the chamber and the parts within the chamber will absorb heat energy, and then release this heat energy over time. At the instant that a flash light is emitted from the flash forming element, a peak of heat energy will be emitted from the chamber. However, the intensity of the peak of heat energy emitted from the chamber will be lower than the intensity of the peak of heat energy emitted from the flash forming element. The flash forming element within the chamber as well as the holding element and the semi-transparent element forming the chamber are resistant to heat and will be able to withstand the peaks of heat energy caused by the flash light emitted from the flash tube as well as by the reflection and/or absorption of part of the flash light emitted from the flash tube. In addition, the heat absorbed by the parts of the chamber, such as the holding element, will dissipate over time with a much lower intensity, until the temperature of the chamber is equal to the temperature of the flash housing. Due to the mass of the holding element, the holding element is able to absorb a substantial amount of heat energy. Accroding to one example, the chamber is a first internal chamber located in the housing, and wherein the housing comprises a second chamber externally of the first internal chamber, wherein the peak of the heat energy emitted from said first internal chamber to the second chamber is lower than the peak of the heat energy emitted from the flash forming element during a flash light. The first internal chamber is thus formed by formed by the holding element and the semi-transparent element as described above, and the second chamber may be formed by the inner walls of the flash housing and the lens element.
According to one embodiment, the semi-transparent element is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 700 nm and 2000 nm. According to one embodiment, the semi-transparent element is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 600 nm and 2000 nm. By using a semi-transparent element which reflects and/or absorbs at least part of light of certain wavelengths, such as light of predetermined second wavelengths between 700 nm and 2000 nm, also called IR-light, the photograph is not affected. However, by reflecting and/or absorbing part of the heat emitted from the flash forming device, parts of the flash housing are protected from intense peaks of heat energy that may damage said parts.
According to one embodiment, the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 700 nm and 2000 nm.
According to one embodiment, the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 600 nm and 2000 nm. By reflecting and/or absorbing a major part of the heat emitted from the flash forming device, parts of the flash housing are even better protected from intense peaks of heat energy that may damage said parts.
According to one embodiment the semi-transparent element is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 10 nm and 400 nm. According to one embodiment the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 10 nm and 400 nm. By using a semi-transparent element which reflects and/or absorbs at least part of light of certain wavelengths, such as light of predetermined second wavelengths between 10 nm and 400 nm, also called UV-light, the photograph is not affected. However, by reflecting and/or absorbing part of the heat emitted from the flash forming device, parts of the flash housing are protected from intense peaks of heat energy that may damage said parts.
According to one embodiment, the semi-transparent element reflects and/or absorbs at least a part of light of predetermined wavelengths between 10 nm and 400 nm and 700 nm and 1000 nm.
According to one embodiment, the semi-transparent element reflects and/or absorbs at least a part of light of predetermined wavelengths between 10 nm and 400 nm and 700 nm and 2000 nm. According to one embodiment, the semi-transparent element is further arranged to reflect and/or absorb a part of the light of predetermined first wavelengths between 400-700 nm to adjust the colour temperature of the flash light.
According to one embodiment, in addition to absorbing and/or reflecting light of a predetermined second wavelength, the semi-transparent element may be arranged to reflect and/or absorb a part of the light of a predetermined first wavelength, which according to one aspect is visible light. By reflecting and/or absorbing a part of the visible light the colour temperature of the transmitted flash light is affected. To change the colour temperature of a flash light may be desirable in order to be able to enhance the quality of a certain photograph. Hence, a user friendly flash device is achieved by allowing an adjustment of the colour temperature of the flash light as well as protecting parts of the flash housing from intense peaks of heat energy. According to one embodiment, the flash forming element is movable in an axial direction inside the flash housing, and the semi-transparent element is arranged to move together with the flash forming element.
By placing the semi-transparent element so that it is movable along with the flash forming element in the flash housing, the semi-transparent element will efficiently reflect and/or absorb flash light of certain wavelengths at all times. A user friendly and safe flash device is achieved. According to one embodiment, the semi-transparent element is placed in close vicinity of the flash forming element.
According to one embodiment, the semi-transparent element is made of glass. By constructing the semi-transparent element in a material not sensitive to the heat from a flash tube, such as glass, a reliable and user friendly flash device is achieved, The semi-transparent element will not be negatively affected by heat and hence will have a long lifetime.
According to one embodiment, the semi-transparent element is made of glass with a coating. According to one embodiment, the semi-transparent element is made of glass where the glass material itself has the desired properties.
According to one embodiment, a method performed in a flash housing for emitting flash light for photographic purposes is provided. The method comprises the steps of: generating a flash light by a flash forming element; transmitting light of predetermined first wavelengths of the generated flash light through a semi-transparent element and reflecting and/or absorbing at least part of light of predetermined second wavelengths of the generated flash light by the semi-transparent element into a chamber formed by the semi-transparent element (5) and a holding element (8) which holding element accommodates the flash forming element, and in which chamber the flash forming element is located, and letting the transmitted light out of the flash housing.
According to one embodiment the peak of the heat energy emitted from the chamber is lower than the peak of the heat energy emitted from the flash forming element during a flash light. BRIEF DESCRIPTION OF THE DRAWINGS
In the following description of embodiments of the proposed technique, reference will be made to the accompanying drawings of which:
Figure 1 schematically illustrates a flash device according to different embodiments. Figure 2 schematically illustrates a flash housing according to different
embodiments.
Figure 3 schematically illustrates parts of a flash housing according to different embodiments.
Figure 4 schematically illustrates parts of a flash housing according to different embodiments.
Figure 5 is a flow chart illustrating an example of a method for emitting a flash light beam lobe for photographic purposes.
DETAILED DESCRIPTION Figure 1 illustrates a flash device 1 according to one example. The flash device 1 is arranged to be used for photographic purposes. According to one example, the flash device 1 is arranged to be releasably attachable to a camera. The flash device 1 comprises in the illustrated example a flash holder 20 and a flash housing 2 hinged onto the flash holder 20. The flash device further comprises a releasable battery 30, attached to the flash holder 20. The flash housing is equipped with a lens element 3 arranged to affect the generated flash light in a desired way. The flash housing is arranged to emit a beam lobe 100 of flash light. According to one example the beam lobe of the flash light has an essentially circular cross section x and a beam angle a. The beam angle a of the flash light beam lobe 100 is according to one embodiment adjustable.
Figure 2 schematically illustrates a cross section of a flash housing 2, used for photographic purposes, viewed from above. The flash housing 2 is arranged to emit a beam lobe 100 of flash light. The flash housing 2 comprises a flash tube 9 partly enclosed by a reflector 4. In a not illustrated example, an alternative flash forming element may be used, for example a lamp and a reflector. The flash tube 9 is in the illustrated example straight. The flash tube may instead have another shape. The reflector 4 has in the illustrated example an essentially oval cross section. The reflector 4 is three dimensional and of a parabola shape. The reflector 4 is arranged to reflect at least part of the flash light emitted from the flash tube 9 in order to direct substantially all of the flash light generated by or emitted from the flash tube 9 towards a lens element 3. In addition, the reflector 4 is arranged to reflect at least part of the flash light in order to make the cross section x of the reflected part of the flash light beam lobe directed towards the lens element 3 as circular as possible, given the available space and construction of the flash housing 2 and the components within the flash housing 2. The cross section x of the flash light beam lobe is a cross section x taken in a direction perpendicular to the direction of the light. The reflector 4 and the flash tube 9 are in the illustrated example arranged in a holding element 8. The holding element 8 may be made of a material which is heat resistant, for example ceramics, glass, metal or similar.
The holding element 8 is in the illustrated example arranged in a carrier 7 which is movably attached to the flash housing 2 by means of a number of guiding elements (not disclosed). The carrier 7 is arranged to be axially movable inside the flash housing
2. A positioner 6 positions the carrier 7 axially in the flash housing 2. According to one embodiment, the positioner comprises a step motor. The position of the carrier 7 and thereby the flash tube 9 and the reflector 4 affects a beam angle a of the emitted beam lobe 100. When the carrier 7 is positioned in an end position close to the lens element
3, the beam angle a of the beam lobe 100 is a maximum beam angle for the beam lobe 100 of the emitted flash light. When the carrier 7 is positioned in an end position most distant from the lens element 3, the beam angle a of the beam lobe 100 is a minimum beam angle a for the beam lobe 100 of the emitted flash light.
The lens element 3 is arranged to let at least part of the flash light generated by the flash tube 9 and the reflector 4 out of the flash housing 2. Ideally, all of the light generated by the flash tube 9 and the reflector 4 is emitted from the flash housing 2. However, some of the flash light may be absorbed by the inner walls of the flash housing 2 etc. The lens element 3 comprises an outer surface 3a and an inner surface 3b, wherein the respective surfaces 3a, 3b affect the flash light differently.
The flash housing 2 further comprises a semi-transparent element 5 arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element.
The semi-transparent element 5 is arranged in the light path between the flash tube 4 and the lens element 3. According to the illustrated embodiment, the semi-transparent element 5 is attached to the holding element 8, in close vicinity to the flash forming element 4, 9. With this placement of the semi-transparent element 5 only the flash light of desired wavelengths will be transmitted through the semi-transparent element 5 and hit the lens element 3. According to one embodiment not illustrated, the placement of the semi-transparent element 5 is a position at a distance from the reflector 3, in the light path between the flash tube 4 and the lens element 3.
According to the illustrated embodiment, the flash forming element 4, 9 is
accommodated in a holding element 8 and the semi-transparent element 5 and the holding element 8 form a chamber, in which the flash forming element is located, and wherein the peak of the heat energy emitted from said chamber is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light. According to one embodiment, the holding element 8 is made of ceramics or glass or metal or another heat resistant material. The chamber formed by the holding element 8 and the semi-transparent element 5 will according to the described embodiment be exposed to a large amount of heat. However, since all the parts of said chamber, that is, the holding element 8 and the semi-transparent element 5, and the parts enclosed by the chamber, that is, the flash tube 9, the reflector 4, are heat resistant, the large amount of heat which is absorbed within the chamber does not damage these parts. However, the other parts of the flash housing 2, such as the lens element 3 and possibly also the inner walls of the flash housing 2, will by this construction be protected from an intense peaks of heat energy generated by the flash tube, and hence, the other parts of the flash housing will be prevented from being damaged by the heat. According to one example, the chamber in which the flash forming element is located is a first internal chamber located in the housing 2, and the housing comprises a second chamber externally of the first internal chamber, wherein the peak of the heat energy emitted from said first internal chamber to the second chamber is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light. The first internal chamber is thus formed by formed by the holding element 8 and the semi-transparent element 5 as described above, and the second chamber is formed by the inner walls of the flash housing 2 and the lens element 3. According to one embodiment said semi-transparent element 5 is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 700 nm and 2000 nm. According to one embodiment, the semi-transparent element is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 700 nm and 2000 nm.
By reflecting and/or absorbing at least part of the light of predetermined second wavelengths between 700 nm and 1000 nm, at least part of IR-light emitted from the flash tube 9 is absorbed and/or reflected. IR-light does not form part of the visible light, and hence, to absorb and/or reflect light of these wavelengths do not affect quality of the photograph.
According to one embodiment, the semi-transparent element 5 is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 10 nm and 400 nm.
According to one embodiment, the semi-transparent element 5 is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 10 nm and 400 nm. By reflecting and/or absorbing at least part of the light of predetermined second wavelengths between 10 nm and 400 nm, at least part of UV-light emitted from the flash tube 9 is absorbed and/or reflected. UV-light does not form part of the visible light, and hence, to absorb or reflect light of these wavelengths do not affect quality of the photograph. According to one embodiment, the semi-transparent element 5 is further arranged to reflect and/or absorb a part of the light of predetermined first wavelengths between 400-700 nm to adjust the colour temperature of the flash light. In order to take photographs of high quality, the colour temperature of flash light used when taking the photo is an important factor. Often, the colour temperature of flash light is too high for an optimal photograph to be taken. By adjusting the colour temperature of a flash light an even better photograph can be taken. According to one embodiment, the semi- transparent element 5 is provided with a coating for adjusting the colour temperature of the light transmitted through said semi-transparent element 5. According to one embodiment, the material in the semi-transparent element 5 itself is arranged to adjust the colour temperature of the light transmitted through said semi-transparent element 5.
According to one embodiment the semi-transparent element 5 is made of glass.
According to one embodiment, the semi-transparent element 5 is made of another heat resistant material. The semi-transparent element 5 is according to one embodiment arranged to absorb and/or reflect all of the light of certain second wavelengths.
According to another embodiment, the semi-transparent element 5 is arranged to absorb and/or reflect a part of the light of certain second wavelengths. According to one embodiment, the semi-transparent element 5 is made of glass with a coating.
According to one embodiment, the semi-transparent element is made of glass wherein the glass material itself gives the semi-transparent element its characteristics.
According to one embodiment, a method performed in a flash housing 2 for emitting flash light for photographic purposes is provided. The method comprises the steps of: generating a flash light; transmitting light of predetermined first wavelengths of the generated flash light and reflecting and/or absorbing at least part of light of
predetermined second wavelengths of the generated flash light, and letting the transmitted light out of the flash housing.
According to one embodiment, the peak of the heat energy emitted from a chamber formed by a holding element 8 and a semi-transparent element 5, said chamber enclosing the flash forming element 4, 9, is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light. According to one embodiment, the flash forming device 4, 9 is movable in an axial direction inside the flash housing 2 and the semi-transparent element 5 is arranged to move together with the flash forming element 4, 9. By moving the flash forming device 4, 9 in the flash housing 2, the beam angle of the emitted beam lobe of flash light is varied, and hence, the user is able to adjust the beam lobe of flash light for each photograph if desired. According to one embodiment, the flash forming device 4, 9 is arranged in the holding element 8, and the semi-transparent element 5 is attached to the holding element. The holding element 8 is in the illustrated example arranged in a carrier 7. The carrier 7 is movably attached to the flash housing 2 by means of a number of guiding elements (not disclosed). The carrier 7 is arranged to be axially movable inside the flash housing 2. A positioner 6 positions the carrier 7 axially in the flash housing 2. In one example, the positioner comprises a step motor. The position of the carrier 7 and thereby the flash tube 9 and the reflector 4 affects a beam angle a of the emitted beam lobe 100. When the carrier 7 is positioned in an end position closest to the lens element, the beam angle a of the beam lobe 100 is a maximum beam angle for the beam lobe. When the carrier 7 is positioned in an end position most distant from the lens element 3, the beam angle a of the beam lobe 100 is minimum beam angle for the beam lobe.
Figure 3 schematically illustrates an example of the design of a flash forming element 4, 9 arranged to generate a flash light, the holding element 8, the carrier 7 and the semi- transparent element 5.
In the illustrated figure 3, the flash forming element comprises a flash tube 9 partly enclosed by a reflector 4. In a not illustrated example, an alternative flash forming element may be used, for example a lamp and a reflector. The flash tube 9 is in the illustrated example elongated. The flash tube 9 is in the illustrated example straight. The flash tube may instead have another shape. However, in small flash devices, such as a flash device which is removably attachable to a camera, the volume within which the flash tube 9 is fitted is limited. It is often difficult to create a small flash tube of a different shape than a straight tube, such as a horse shoe shape etc.
The reflector 4 may have some or all of the characteristics of the reflector as discussed in relation to figure 2. A semi-transparent element 5 is further arranged in the beam path after the flash forming element 4, 9. The semi-transparent element 5 is arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of light of predetermined second wavelengths generated by the flash forming element 4, 9. The reflector 4, the flash tube 9 and the semi-transparent element 5 are in the illustrated example arranged in or on a holding element 8. The holding element 8 may be made of a materia! which is heat resistant, for example ceramics, glass, metal or similar. The holding element 8 and the semi-transparent element 5 form a chamber which encloses the flash tube 9 and the reflector 4. When generating flash light, the peak of the heat energy emitted from the chamber is lower than the peak of the heat energy emitted from the flash forming element 4, 9 during a flash light. However, the parts 5, 8 forming the chamber and the flash tube 9 and the reflector 4 are characteristically heated. All the parts of the chamber and within the chamber can characteristically withstand high temperatures. When a flash light is emitted, the peak of heat energy emitted from the flash tube 9 is higher than the peak of heat energy emitted from the chamber, that is, the peak of heat energy transmitted through the holding element 8 and the semi-transparent element 5. This is because part of the light is not transmitted through the semi- transparent element 5. The parts of the chamber will absorb heat energy created from the reflected and/or absorbed light. In a time period after the flash light has been emitted, the heat energy will dissipate from the chamber to the surrounding until the temperature of the chamber is the same as the rest of the flash housing. The mass of the holding element 8 is relatively large, allowing for a large amount of heat energy to be stored in the holding element 8. The peak of heat energy emitted from the chamber during a flash light is reduced to a level which does not damage the lens element or other parts of the flash housing or accessories attached to the flash housing.
The holding element 8 is in the illustrated example arranged in a carrier 7. The carrier is movably attached to the flash housing 2 by means of a number of guiding pins and a screw element. The carrier 7 is arranged to be axially movable inside the flash housing 2. A positioner 6 positions the carrier 7 axially in the flash housing 2. In one example, the positioner comprises a step motor. The position of the carrier 7 and thereby the holding element 8, the flash tube 9 and the reflector 4 affects a beam angle a of the emitted beam lobe of flash light 100. When the carrier 7 is positioned in an end position closest to the lens element 3, the beam angle a of the beam lobe 100 is a maximum beam angle for the beam lobe. When the carrier 7 is positioned in an end position most distant from the lens element 3, the beam angle a of the beam lobe of flash light 100 is the minimum beam angle for the beam lobe.
In a not illustrated example the holding element 8 and the carrier 7 are integrated in one piece.
The carrier 7 has a guided nut for engagement with a screw element (not shown). When the screw element is rotated clockwise and counter-clockwise by means of the step motor, this causes the carrier to move axially back and forward within the flash housing.
The carrier 7 may further have at least one, in the illustrated example two, guiding pin supports 18. At least one guiding pin 19 suspended in the flash housing (not disclosed) and mounted coaxially with the screw element can then run through the guiding support(s). The at least one guiding pin support 18 is formed as an opening suitable for accommodating the respective guiding pin. The size of the opening is adapted to the size of the pin 19 so that the guiding pin support 18 can move freely back and forward therein but with a minimum gap. Thereby the functionality that the carrier 7 is stably arranged within the flash housing and prevented to perform any rotational movements is fulfilled. When the carrier 7 is guided by both the screw element and at least one guiding pin, rotational movements around the axis of the screw element/guiding pin(s) and rotational movements along the axis of the screw element/guiding pin(s) may be avoided.
Figure 4 schematically illustrates an exploded view of the carrier 7, the holding element 8, the reflector 4 the flash tube 9 and the semi-transparent element 5.
In Figure 5, a method for generating a flash light for photographic purposes is illustrated. The method comprises a first step s1 of generating a flash light by a flash forming element.
The method comprises a second step of transmitting light of predetermined first wavelengths of the generated flash through a semi-transparent element 5 and reflecting and/or absorbing at least part of light of predetermined second wavelengths of the generated flash light by the semi-transparent element into a chamber formed by the semi-transparent element 5 and a holding element 8 which holding element accommodates the flash forming element, and in which chamber the flash forming element is located.
The method comprises a third step s3 of letting the transmitted light out of the flash housing.

Claims

1. A flash housing
(2) for emitting flash light for photographic purposes
comprising:
- a flash forming element (4, 9) arranged to generate a flash light; and
- a lens element
(3) arranged to let at least part of the generated flash light out of the flash housing (2), wherein the flash housing (2) further comprises a semi-transparent element (5) arranged to transmit light of predetermined first wavelengths and to reflect and/or absorb at least part of fight of predetermined second wavelengths generated by the flash forming element (4, 9), wherein the flash forming element (4, 9) is accommodated in a holding element (8) and wherein said semi-transparent element (5) and the holding element (8) form a chamber in which the flash forming element is located, wherein the peak of the heat energy emitted from said chamber is lower than the peak of the heat energy emitted from the flash forming element (4, 9) during a flash light.
The flash housing (2) according to claim 1 , wherein the flash forming element (4, 9) comprises:
- a flash tube (9); and
- a reflector
(4).
The flash housing (2) according to claim 1 or 2, wherein said semi-transparent element (5) is arranged in the light path between the flash forming element (4, 9) and the lens element (3).
The flash housing (2) according to any one of claims 1 to 3, wherein the chamber is a first internal chamber located in the housing, and wherein the housing comprises a second chamber externally of the first interna! chamber, wherein the peak of the heat energy emitted from said first internal chamber to the second chamber is lower than the peak of the heat energy emitted from the flash forming element (4, 9) during a flash light.
5. The flash housing (2) according to any one of claims 1 to 4, wherein said semi- transparent element (5) is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 700 nm and 2000 nm.
6. The flash housing (2) according to any one of claims 1 to 5, wherein said semi- transparent element (5) is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 700 nm and 2000 nm.
7. The flash housing (2) according to any one of claims 1 to 6 wherein said semi- transparent element (5) is arranged to reflect and/or absorb at least part of light of predetermined second wavelengths between 10 nm and 400 nm.
8. The flash housing (2) according to any one of claims 1 to 7 wherein said semi- transparent element (5) is arranged to reflect and/or absorb a major part of or all of the light of predetermined second wavelengths between 10 nm and 400 nm.
9. The flash housing (2) according to any one of claims 1 to 8, wherein said semi- transparent element (5) is further arranged to reflect and/or absorb a part of the light of predetermined first wavelengths between 400-700 nm to adjust the colour temperature of the flash light.
10. The flash housing (2) according to any one of claims 1-9, wherein said flash forming element (4, 9) is movable in an axial direction inside the flash housing (2), and wherein the semi-transparent element (5) is arranged to move together with the flash forming element (4, 9).
11. The flash housing (2) according to any one of claims 1-10, wherein the semi- transparent element (5) is made of glass.
12. The flash housing (2) according to any one of claims 1-1 1 , wherein the semi- transparent element (5) is made of glass with a coating.
13. A method performed in a flash housing (2) for emitting flash light for
photographic purposes, said method comprising the steps of :
- generating a flash light by a flash forming element;
- transmitting light of predetermined first wavelengths of the
generated flash light through a semi-transparent element (5) and reflecting and/or absorbing at least part of light of predetermined second wavelengths of the generated flash light by the semi-transparent element into a chamber formed by the semi-transparent element (5) and a holding element (8) which holding element accommodates the flash forming element, and in which chamber the flash forming element is located, and
- letting the transmitted light out of the flash housing (2).
14. The method according to claim 13, wherein the peak of the heat energy emitted from the chamber is lower than the peak of the heat energy emitted from the flash forming element (4, 9) during a flash light.
PCT/SE2018/050949 2017-09-18 2018-09-18 A flash housing for emitting flash light for photographic purposes and a method performed in a flash housing WO2019054938A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2020238916A1 (en) * 2019-05-28 2020-12-03 深圳市神牛摄影器材有限公司 Photographic lamp chuck compatible with different lamp holders
US11803103B2 (en) 2019-05-28 2023-10-31 Godox Photo Equipment Co., Ltd. Photographic lamp chuck compatible with different lamp holders

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