WO2008091213A1 - Lamp socket adapter with safety circuit - Google Patents

Lamp socket adapter with safety circuit Download PDF

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Publication number
WO2008091213A1
WO2008091213A1 PCT/SE2008/050071 SE2008050071W WO2008091213A1 WO 2008091213 A1 WO2008091213 A1 WO 2008091213A1 SE 2008050071 W SE2008050071 W SE 2008050071W WO 2008091213 A1 WO2008091213 A1 WO 2008091213A1
Authority
WO
WIPO (PCT)
Prior art keywords
adapter
voltage
current
component
lamp
Prior art date
Application number
PCT/SE2008/050071
Other languages
French (fr)
Inventor
Bo Dalenius
Original Assignee
Profoto Ab
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 Ab filed Critical Profoto Ab
Publication of WO2008091213A1 publication Critical patent/WO2008091213A1/en

Links

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/10—Safety devices structurally associated with lighting devices coming into action when lighting device is overloaded, e.g. thermal switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
    • H01R31/065—Intermediate parts for linking two coupling parts, e.g. adapter with built-in electric apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/945—Holders with built-in electrical component
    • H01R33/95—Holders with built-in electrical component with fuse; with thermal switch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/006—Fastening of light sources or lamp holders of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base
    • F21V19/007—Fastening of light sources or lamp holders of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base the support means engaging the vessel of the source
    • 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
    • G03B2215/056—Connection with camera, e.g. adapter
    • 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
    • G03B2215/0564—Combinations of cameras with electronic flash units characterised by the type of light source
    • G03B2215/0571—With second light source

Definitions

  • the present invention rebates to an adapter with a first lamp socket adapted to permit connection of a iamp intended for a first voltage and a first current to a second lamp socket belonging to a device intended for a second voltage and a second current, where the first voltage and the first current are lower than the second distrage and the second current.
  • a safety circuit associated with the adapter comprises a breaking component connected in series to the first lamp socket and adapted to be able to maintain a closed initial state or assume an opened breaking state depending upon which current passes through the breaking component.
  • the breaking component is adapted to maintain the closed initial state rf an apparatus to which the adapter is connected supplies the first current, and to assume the open state if an apparatus to which the adapter is connected supplies the second current.
  • a 12 V system is thus often adapted so that devices from a 230 V system are also suited for mechanical and electric connection to a 12 V system.
  • an adapter is required which permits the connection of a 12 V lamp to a iamp holder or iamp socket for a 230 V lamp.
  • Such adapters are previously known in the art and make it simple to use the same devices for both 12 V systems and 230 V systems.
  • a breaking component which is often a fuse, has a certain inertia, and this is required in order that the supply to the lamp will not be disconnected unnecessarily because the fuse is so sensitive that it disconnects on the wrong occasions. Simultaneously, the fuse must be sufficiently rapid to be able to break the current in time in, for example, flashlight photography and a supply voltage of 230 V to a 12 V lamp.
  • the safety circuit belonging to the adapter encompasses a short-circuiting component connected in parallel with the first lamp socket and adapted to be abie to maintain an open initial state or a closed, short circuiting state depending upon which voltage is connected across the short- circuiting component.
  • the present invention further discloses that the short- circuiting component is adapted to maintain the open initial state if a device to which the adapter is connected supplies the first voltage, and to assume the closed short circuiting state if a device to which the adapter is connected supplies the second voltage.
  • Such a short-circuiting component which is connected in parallel across the first lamp socket short circuits the lamp socket and diverts the current away from the sensitive lamp, at the same time as the short circuiting entails a current surge with the result that the breaking component breaks the current even if this takes place with a certain time lag because of its inherent
  • the adapter according to the present invention is adapted to protect a lamp from the second voltage or the second current, it may be so that the sensitivity of the lamp results in the lamp being destroyed by currents which are iower than the second current. Consequently, the present invention discloses that the breaking component may be adapted to assume the open state if a device to which the adapter is connected supplies a current which is harmful to a lamp connected to said adapter and that the short-circuiting component is adapted to assume the closed state if a device to which the adapter is connected supplies a voltage which is harmful to a lamp connected to the adapter.
  • Simple components which may constitute a part of an adapter according to the invention are a fuse which may constitute the breaking component and a spark gap which may constitute the short-circuiting component.
  • Normal voltage ievels for mains driven and battery driven systems, respectively, are 230 and 12 V, respectively and the present invention discloses that an adapter according to the present invention may be adapted so that the firstiserage consists of a battery voltage, for example 12 V, and so that the second voltage consists of a mains voltage, for example 230 V.
  • the present invention further discloses that the first lamp socket is adapted for photo lamps or flashlights driven by a battery voltage, and that the adapter is adapted to a connection to a device with a second lamp socket adapted to photography lamps or flashlights powered by a mains voltage unit.
  • Fig. 1 illustrates schematically and in highly simplified form an adapter
  • Fig. 2 schematically illustrates a simplified circuit solution for a safety circuit
  • an adapter according to the present invention is thus shown, the adapter 1 having a first iamp socket 11 adapted to permit connection of a lamp 2 intended for a first voltage U1 and first current 11 , to a second lamp socket 31 associated with a device 3 intended for a second voltage U2 and a second current I2.
  • the first voltage U1 and the first current 11 are lower than the second voltage U2 and the second current I2.
  • the adapter 1 does not constitute a voltage adapter, but simply a mechanical adapter which makes for a mechanical and electrical connection of a iamp 2 which in size does not fit in the second lamp socket 31.
  • the device 3 may, as a result of the adapter, also be employed in systems using the lowerireage V1 and with lamps 2 adapted to this lower voltage.
  • a safety circuit 12 associated with the adapter 1 also illustrated in Fig. 2,
  • the breaking component 12a is adapted to maintain its closed initial state if a device 3 to which the adapter 1 is connected supplies the first current 11 , but it is adapted to assume its open state If a device 3 to which the adapter 1 is connected suppiies the second current I2.
  • the present invention further discloses that the safety circuit 12 i ⁇ ciudes a short-circuiting component 12b connected in parallel to the first lamp socket 11 , and adapted to be able to maintain an open initial state or a closed short circuiting state depending upon which voltage U is connected across the short-circuiting component 12b.
  • This short-circuiting component 12b is adapted to maintain its open initial state if a device 3 to which the adapter 1 is connected supplies the first voltage U1 , but to assume its dosed state if a device 3 Io which the adapter 1 is connected supplies the second voltage U2.
  • the present invention further discloses that the breaking component 12a may be adapted to assume its open breaking state if a device 3 to which the adapter 1 is connected supplies a current I which is harmful to a lamp 2 connected to the adapter, and that the short-circuiting component 12b may be adapted to assume its closed short circuiting state if a device 3 to which the adapter 1 is connected supplies a voltage U which is harmful to a lamp 2 connected to the
  • One embodiment of the present invention discloses that the breaking component 12a consists of a fuse, and that the short-circuiting component 12b consists of a spark gap.
  • mains powered voltage units often supply a distrage level corresponding to the mains voltage, for instance 230 V 5 while battery driven voltage units supply a normal battery voltage, for instance 12 V 1 with the result that the first voltage may consist of a battery voltage, for instance 12V 3 and the second voltage may consist of a mains voltage, for instance 230 V.
  • the present invention is suitable in lighting systems for film and photography where devices 3 for iighting are occasionally driven by mains powered voltage units and occasionally by battery driven voltage units.
  • the first lamp socket 11 may be adapted to photography lamps or flashlights drivers by a battery voltage
  • the adapter is adapted to a connection to a device 3 with a second lamp socket 31 adapted for photography lamps or flashlights driven by a

Abstract

The present invention relates to an adapter (1 ) with a first lamp socket (11 ) adapted to permit a connection of a lamp (2) intended for a first voltage and a first current to a second lamp socket (31 ) belonging Io a device (3) intended for a second voltage and a second current. A safety circuit (12) belonging to the adapter {1 } comprises a breaking component (12a) connected in series to the first lamp socket (11 ), and adapted to maintain a closed initial state if a device (3) to which the adapter (1 ) is connected supplies the first current, or to assume an open breaking state if a device (3) to which the adapter (1 ) is connected supplies the second current The safety circuit also comprises a short-circuiting component (12b) connected in parallel with the first lamp socket (11 ) and adapted to maintain an open initial state if a device (3) to which the adapter (1 ) is connected supplies the first voltage, or to assume a closed short circuiting state If a device (3) to which the adapter (1 ) is connected supplies the second voltage.

Description

Lamp socket adapter with safety circuit
The present invention rebates to an adapter with a first lamp socket adapted to permit connection of a iamp intended for a first voltage and a first current to a second lamp socket belonging to a device intended for a second voltage and a second current, where the first voltage and the first current are lower than the second voitage and the second current.
A safety circuit associated with the adapter comprises a breaking component connected in series to the first lamp socket and adapted to be able to maintain a closed initial state or assume an opened breaking state depending upon which current passes through the breaking component. The breaking component is adapted to maintain the closed initial state rf an apparatus to which the adapter is connected supplies the first current, and to assume the open state if an apparatus to which the adapter is connected supplies the second current.
In lighting in connection with filming or photography, different light sources are employed. These may be in the form of both floodlight and flashlight, In iighting systems for these areas of application, there are standardised components which may be combined in different ways to achieve the desired effects. Fundamental components are lamps with reflectors of different types, as well as power units for supplying energy to these lamps. Lamps with reflectors are often mounted on different devices which, on the one hand, permit an adjustment of the position of the lamps and the reflectors and which also constitute conductors for voltage and current from the power unit to the lamp,
Traditionally, these systems were based on voltage levels which coincided with the mains voitage employed, for instance 230 V. However, in recent years portable battery-powered systems have become increasingly common which are often built around battery-based power assembiies which supply a much lower voltage, for example 12 V.
This implies that there are two different systems with different voltage ievels, In order to be able to employ as much material as possible in both systems, a 12 V system is thus often adapted so that devices from a 230 V system are also suited for mechanical and electric connection to a 12 V system. For a 12 V lamp to be able to be connected to a device which is originally rated for a 230 V system, an adapter is required which permits the connection of a 12 V lamp to a iamp holder or iamp socket for a 230 V lamp. Such adapters are previously known in the art and make it simple to use the same devices for both 12 V systems and 230 V systems.
Problems may occur if the lamp which is connected to the device is not intended for the power unit employed. This is not a major problem if a 230 V lamp is used in a 12 V system, since such a mistake merely entails that the lamp does not light or that it does not deliver sufficient light, which will then immediately be discovered and can be remedied. However, the problem is more serious if a 12 V lamp is connected to a 230 V system since this not only results in a lamp being destroyed, but may aiso result in a exptosion-like effect when the lamp is destroyed, which in turn could result in personal injury, in order to reduce this risk, it is previously known in the art to iπciude in an adapter a safety circuit with a breaking component, such as a fuse, so that lhe fuse will break the current to the lamp if a device with a connected 12 V lamp were erroneously to be connected to a unit supplying 230 V.
In certain contexts, such as in flashlights, it is a technical probiem to be able, in those cases when a 12 V lamp is connected via an adapter to a device and a power unit supplying 230 V1 to break the incoming current to the lamp sufficiently quickly in order to have time to save the lamp before it is destroyed.
A breaking component, which is often a fuse, has a certain inertia, and this is required in order that the supply to the lamp will not be disconnected unnecessarily because the fuse is so sensitive that it disconnects on the wrong occasions. Simultaneously, the fuse must be sufficiently rapid to be able to break the current in time in, for example, flashlight photography and a supply voltage of 230 V to a 12 V lamp. With the object of resolving one or more of the above-outlined problems, and taking as the point of departure the state of the art as disclosed above, the present invention discloses that the safety circuit belonging to the adapter encompasses a short-circuiting component connected in parallel with the first lamp socket and adapted to be abie to maintain an open initial state or a closed, short circuiting state depending upon which voltage is connected across the short- circuiting component. The present invention further discloses that the short- circuiting component is adapted to maintain the open initial state if a device to which the adapter is connected supplies the first voltage, and to assume the closed short circuiting state if a device to which the adapter is connected supplies the second voltage. Such a short-circuiting component which is connected in parallel across the first lamp socket short circuits the lamp socket and diverts the current away from the sensitive lamp, at the same time as the short circuiting entails a current surge with the result that the breaking component breaks the current even if this takes place with a certain time lag because of its inherent
While the adapter according to the present invention is adapted to protect a lamp from the second voltage or the second current, it may be so that the sensitivity of the lamp results in the lamp being destroyed by currents which are iower than the second current. Consequently, the present invention discloses that the breaking component may be adapted to assume the open state if a device to which the adapter is connected supplies a current which is harmful to a lamp connected to said adapter and that the short-circuiting component is adapted to assume the closed state if a device to which the adapter is connected supplies a voltage which is harmful to a lamp connected to the adapter.
Simple components which may constitute a part of an adapter according to the invention are a fuse which may constitute the breaking component and a spark gap which may constitute the short-circuiting component. Normal voltage ievels for mains driven and battery driven systems, respectively, are 230 and 12 V, respectively and the present invention discloses that an adapter according to the present invention may be adapted so that the first voitage consists of a battery voltage, for example 12 V, and so that the second voltage consists of a mains voltage, for example 230 V. The present invention further discloses that the first lamp socket is adapted for photo lamps or flashlights driven by a battery voltage, and that the adapter is adapted to a connection to a device with a second lamp socket adapted to photography lamps or flashlights powered by a mains voltage unit.
Those advantages which may principally be associated with an adapter according to the present invention are that existing devices adapted for 230 V systems may also be employed in systems for battery power with lower voltage and with the aid of an adapter for the employed lamps without lhe risk of destroying a lamp intended for taw voitage if the device is erroneously connected in a system for high voltage.
πc
An adapter displaying the properties associated with the present invention will now be described in greater detail hereinbelow for purposes of exemplificalion, with reference to the accompanying Drawings, in which:
Fig. 1 illustrates schematically and in highly simplified form an adapter
Fig. 2 schematically illustrates a simplified circuit solution for a safety circuit
With reference to Fig. I 1 an adapter according to the present invention is thus shown, the adapter 1 having a first iamp socket 11 adapted to permit connection of a lamp 2 intended for a first voltage U1 and first current 11 , to a second lamp socket 31 associated with a device 3 intended for a second voltage U2 and a second current I2. The first voltage U1 and the first current 11 are lower than the second voltage U2 and the second current I2. The adapter 1 does not constitute a voltage adapter, but simply a mechanical adapter which makes for a mechanical and electrical connection of a iamp 2 which in size does not fit in the second lamp socket 31. Thus, the device 3 may, as a result of the adapter, also be employed in systems using the lower voitage V1 and with lamps 2 adapted to this lower voltage. A safety circuit 12 associated with the adapter 1 , also illustrated in Fig. 2,
11 and adapted to be able to maintain a closed initial state or assume an open breaking state depending upon which current I passes through the breaking component 12a. The breaking component 12a is adapted to maintain its closed initial state if a device 3 to which the adapter 1 is connected supplies the first current 11 , but it is adapted to assume its open state If a device 3 to which the adapter 1 is connected suppiies the second current I2.
The present invention further discloses that the safety circuit 12 iπciudes a short-circuiting component 12b connected in parallel to the first lamp socket 11 , and adapted to be able to maintain an open initial state or a closed short circuiting state depending upon which voltage U is connected across the short-circuiting component 12b. This short-circuiting component 12b is adapted to maintain its open initial state if a device 3 to which the adapter 1 is connected supplies the first voltage U1 , but to assume its dosed state if a device 3 Io which the adapter 1 is connected supplies the second voltage U2.
The present invention further discloses that the breaking component 12a may be adapted to assume its open breaking state if a device 3 to which the adapter 1 is connected supplies a current I which is harmful to a lamp 2 connected to the adapter, and that the short-circuiting component 12b may be adapted to assume its closed short circuiting state if a device 3 to which the adapter 1 is connected supplies a voltage U which is harmful to a lamp 2 connected to the
One embodiment of the present invention discloses that the breaking component 12a consists of a fuse, and that the short-circuiting component 12b consists of a spark gap.
Further, mains powered voltage units often supply a voitage level corresponding to the mains voltage, for instance 230 V5 while battery driven voltage units supply a normal battery voltage, for instance 12 V1 with the result that the first voltage may consist of a battery voltage, for instance 12V3 and the second voltage may consist of a mains voltage, for instance 230 V.
The present invention is suitable in lighting systems for film and photography where devices 3 for iighting are occasionally driven by mains powered voltage units and occasionally by battery driven voltage units. Thus, the first lamp socket 11 may be adapted to photography lamps or flashlights drivers by a battery voltage, where the adapter is adapted to a connection to a device 3 with a second lamp socket 31 adapted for photography lamps or flashlights driven by a
Naturally, the present invention is not restricted to the embodiments disclosed above by way of example, but may undergo modifications without departing from the scope of the inventive concept as this is illustrated in the Clair

Claims

1 , An adapter (1 ) with a first lamp socket (11 ) adapted to permit connection of a lamp (2) intended for a first voyage (U1 ) and a first current (11 ) to a second lamp socket (31 ) belonging to a device (3) intended for a second voltage (U2) and a second current (I2), where said first voltage (U1 ) and first current (H ) are lower than said second voltage (U2) and second current (!2), where a safety circuit (12) belonging to said adapter (1 ) comprises breaking component (12a) connected in series to said first iamp socket (11 ), where said breaking component (12a) is adapted to be able to maintain a dosed initial state or assume an open breaking state depending upon what current passes through said breaking component, where said breaking component (12a) is adapted to maintain said closed initiai state if a device (3) to which said adapter (1 ) is connected supplies said first current (11 ), and where said breaking component (12a) is adapted to assume said open state if a device (3) to which said adapter (1 ) is connected supplies said second current (I2), characterised in that said safety circuit (12) comprises a short-circuiting component (12b) connected in parallel to said first iamp socket (11 ), that said short-circuiting component (12b) is adapted to be able to maintain an open initial state or a closed short circuiting state depending upon which voltage is connected across said short-circuiting component, that said short- circuiting component (12b) is adapted to maintain said open initial state if a device (3) to which said adapter (1 ) is connected supplies said first voltage (U1 ), and that said short-circuiting component (12b) is adapted to assume said closed state if a device (3) to which said adapter (1 ) is connected supplies said second voltage
2. The adapter as claimed in Claim 1 , characterised In that said breaking component (12a) is adapted to assume said open state if a device (3) to which said adapter (1 ) is connected supplies a current harmful to a lamp (2) connected to said adapter (1 ), and that said short-circuiting component (12b) is adapted to assume said closed state if a device (3) to which said adapter (1 ) is connected supplies a voltage harmful to a lamp (2) connected to said adapter (3),
3. The adapter as claimed in Claim 1 or 2« characterised In that said breaking component (12a) consists of a fuse, and that said short-circuiting component (12b) consists of a spark gap.
4. The adapter as claimed in any of the preceding Claims, characterised in that said first voltage (U1 ) consists of a battery voltage, for instance 12 V, and that said second voltage (U2) consists of a mains voltage, for instance 230 V.
5. The adapter as claimed in any of the g Claims, [0 that said first lamp socket (11 ) is adapted to photography lamps or flashlights driven by a battery voltage, and that said is adapted to a connection to a device (3) with a second lamp socket (31 )
1GUaQi
PCT/SE2008/050071 2007-01-25 2008-01-23 Lamp socket adapter with safety circuit WO2008091213A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700204-1 2007-01-25
SE0700204A SE530799C2 (en) 2007-01-25 2007-01-25 Adapter

Publications (1)

Publication Number Publication Date
WO2008091213A1 true WO2008091213A1 (en) 2008-07-31

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ID=39644720

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Application Number Title Priority Date Filing Date
PCT/SE2008/050071 WO2008091213A1 (en) 2007-01-25 2008-01-23 Lamp socket adapter with safety circuit

Country Status (2)

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SE (1) SE530799C2 (en)
WO (1) WO2008091213A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015078080A1 (en) * 2013-11-28 2015-06-04 深圳市神牛摄影器材有限公司 On-camera flash

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353066A (en) * 1965-09-17 1967-11-14 Joslyn Mfg & Supply Co Surge protection circuit
DE2839097A1 (en) * 1978-09-08 1980-03-20 Multiblitz Mannesmann Gmbh Co Modular electronic flash unit - has central power pack to which portable or studio flash heads and various chargers can be connected
EP0071768A1 (en) * 1981-07-31 1983-02-16 Murata Manufacturing Co., Ltd. Lamp protection arrangement and junction socket therefor
US5530627A (en) * 1994-12-16 1996-06-25 Morgan; John J. Electronic flash head and accessories

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353066A (en) * 1965-09-17 1967-11-14 Joslyn Mfg & Supply Co Surge protection circuit
DE2839097A1 (en) * 1978-09-08 1980-03-20 Multiblitz Mannesmann Gmbh Co Modular electronic flash unit - has central power pack to which portable or studio flash heads and various chargers can be connected
EP0071768A1 (en) * 1981-07-31 1983-02-16 Murata Manufacturing Co., Ltd. Lamp protection arrangement and junction socket therefor
US5530627A (en) * 1994-12-16 1996-06-25 Morgan; John J. Electronic flash head and accessories

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015078080A1 (en) * 2013-11-28 2015-06-04 深圳市神牛摄影器材有限公司 On-camera flash

Also Published As

Publication number Publication date
SE530799C2 (en) 2008-09-16
SE0700204L (en) 2008-07-26

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