US2549330A - Photographic light unit - Google Patents

Photographic light unit Download PDF

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Publication number
US2549330A
US2549330A US741632A US74163247A US2549330A US 2549330 A US2549330 A US 2549330A US 741632 A US741632 A US 741632A US 74163247 A US74163247 A US 74163247A US 2549330 A US2549330 A US 2549330A
Authority
US
United States
Prior art keywords
socket
base
contacts
lamp
holder
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US741632A
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English (en)
Inventor
Edward B Noel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to NL72934D priority Critical patent/NL72934C/xx
Priority to NL676716802A priority patent/NL139917B/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US741632A priority patent/US2549330A/en
Priority to GB10503/48A priority patent/GB648418A/en
Application granted granted Critical
Publication of US2549330A publication Critical patent/US2549330A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/96—Lamps with light-emitting discharge path and separately-heated incandescent body within a common envelope, e.g. for simulating daylight

Definitions

  • My invention relates to lighting units for photography and is of particular interest in connection with such units comprising two lamps assembled-so as to have a common light center.
  • Units of this type are available commercially and comprise an incandescent lamp to furnish lighten the subject before the photograph is taken and an electric discharge lampwhich emits an intense flash of actinic light by which the photograph maybe taken.
  • the discharge lam is inthe form of a helically coiled tube and the incandescent lamp is mounted coaxially with the tube and the jacket.
  • a lamp unit of this type is disclosed and claimed in copending application Serial No. 503,068, filed September 20, 1943, by Paul B. Davisand myself which application is assigned to the same assignee as the present application and is now Patent No. 2,469,607, issued May 10, 1949.
  • the discharge tube and the incandescent lamp are supported from a base which is attached to the open end of a light transmitting tubular jacket surrounding the two light sources.
  • the base has five contact prongs through which electric power is supplied to the lamps and by which the'unit may be mounted on a suitable holder.
  • An object of my invention is to simplify the structure and increase the safety factor and convenience in use of lighting units including lamp units and holders of the above type.
  • Fig. 1 is an. elevation, partly in section, of a lighting unit embodying my invention
  • Fig. 2 is a bottom view of the holder shown in Fig. 1.
  • the lighting unit comprises three main members: The holder I, the incandescent lamp 2 and the discharge lamp unit 3.
  • the latter is madeup of a light transmitting tubular jacket 4, an annular base 5 and a helically coiled discharge tube 6 of glass or quartz containing a suitable ionizable atmosphere, such as a filling of xenon, and having a cathode 1 and an anode 8 sealed in its ends.
  • the base 5 is cemented to the open end of the jacket and is provided with contact prongs 9, I0 and II towhich are attached metal wires I2, I 3 and I 4, respectively, which form a rigid framework in the form of a cylindrical enclosure for supporting the tube 6 axiallywithin the jacket 4 and through which electrical energy is supplied through contact prongs 9 and I0.
  • emits a flash of actinic light of high intensity I0 and II pass through openings in the annular support plate or disc I5 of the holder I and the portions of reduced section thereof are re,- leasably engaged by spring clip type electric contacts I6, I! and I8, respectively, in registry with the openings and secured to the bottom of the disc I5 (Fig. 2) which consists of electrically insulating material.
  • the holder contacts I6, I! and I8 are arranged in a circle concentric with a socket I9 mounted in the center opening of the sup ort disc I5.
  • the socket I-9 accom-v modates the bayonet type base 20 of the incandescent lamp 2 which is thus supported by the holder I independently of the discharge lamp unit 3 and coaxially with the said unit so that the two light sources, that is, the discharge tube 6 and the axially extending filament in the incandescent lamp 2 have the same light center.
  • the electrical energy supplied to the discharge tube 6 is at a higher voltage than that supp ied to the incandescent lamp 2.
  • the contact prong I I for the high voltage lead I4 is spaced a greater angular distance from the prongs 9 and I0 than the angular distance between prongs 9 and II] for safety purposes.
  • an electrically insulating sleeve 2 I surrounds the socket I9 for the incandescent lamp 2 and extends beyond both ends of the socket I9 a sufficient distance to prevent'electrical flash-overs between the incandescent lamp socket I9 and the holder contacts I6, I! and I8 on the one hand and between the current lead wires I2, I3 and I4 of the discharge lamp base 20- or the socket I9 on the other hand. This increases the safety factor of the lighting-unit.
  • extends an appreciable distance beyond the top of the base 20 in the socket I9 and the lower end extends an appreciable distance beyond the two set-screw contacts 22 on thebottom of the socket I9 by which the incandescent lamp 2- may be connected across the terminals of a posed between the closely spaced contacts 22 to prevent short circuits between them.
  • is held in place on the support disc l by its shoulder 24 butting against the electrically insulating annular disc 25 cemented to the disc l5 and by a retainer ring 26 of electrically insulating material which makes a frictional fit with the; sleeve 21 and is fastened to the disc l5 by a plurality of bolts one of which, 21, is shown in Fig. 1.
  • Set screws also may be used to secure ring 26 to sleeve 2!.
  • the ring 26 increases the length of the pathbetween the contact II and the contacts 9 and lD.to decrease the possibility of flashover between these contacts.
  • the disc 25 covers and electrically insulates the top of rivets 28 holding the contacts 16,11 and I8 onthe disc l5. a frictional fit with the sleeve 2
  • the supporting structure for the helically coiledenvelope of the discharge device comprises spud wires 39 extending laterally from the current inleads l2 and i3 engaging the adjacent topand bottom coil of the tube 6, and tie wires (not shown) looped around the turns of the tube and secured as by welding, to the inlead l serving'as the triggering electrode for the discharge tube.
  • the inlead [4 (part only of which is shown in the drawing) extends upward from the contact prong Ii on the'base 5, thence across the top of the coiled tube 6 and then downward toward the base 5. The last mentioned part thereof: is shown in the drawing.
  • Spring strip braces 31- which are welded to the upper end portions of the inleadsl2, l3 and I4 and which engage the enclosing jacket 4 serve to give additional support to the: helical tube 6 as disclosed in my' copending application Serial No. 716,936, filed December 18, 1946'.
  • conductive supports extending upward fromsaid annular'base to. define: a cylindrical enclosure and; a helically coileddischargectubep mountedon the supports and within the enclosure and The socketzl flimakes.
  • a lamp holder comprising an electrically insulating annular support, a socket for an incandescent lamp base mounted in the opening in the. support and a plurality of electric contacts mounted in a circle on the support concentric with the socket for engaging electric terminals of an annular lamp base and holding the annular base aroundsaid socket, and an electricallyinsulating sleeve surrounding the socket. and extending beyond both its ends to insulatev the socket. and the base accommodated thereby from the; contacts on the support.
  • a lamp holder comprising an electrically insulating annular support plate having openings around its center opening for receiving contact prongs, a socket for an incandescent lamp base mounted in. the center. opening in the plate with its' base-receiving, part opening in adirection transverseto theplate and a plurality of electriccontacts mounted on the surface of the plate facing away. from the direction in which the socket opensand each being in registry with a prongereceiving opening. in the plate so asto engagev a contact. prong inserted through said opening.
  • a lamp. holder comprising an electrically insulating annular support, a socket for an incandescent lampbase mounted. in the opening in the support and aplurality of electriccontacts mounted in a circle on thesupport concentric with the socket for engaging electric terminals of, an, annular lamp base and holding the annular. base around said socket, and an electrically insulating'sleeve surrounding the socket and extending beyond its ends to insulate the socket andthe base accommodated thereby from the contacts, on the support, saidsleeve also being interposed between one and the. other of said: contacts toincrease-the insulation therebetween.
  • a lamp holder comprising an electrically insulating annular support platev having open-- ings arranged in a circleconcentric; with its center'cpe-ning for receiving con-tact; prongaa socketfor an incandescent lamp base mounted in: the. center opening of said platewith. its: pa-segreceiving; part opening in a, direction transverse to the plate;for the receptionofa lampibase therein and; a plurality of electric contacts mounted on the surface of, the plate facing: away from. the direction in. which said socket; opens. and; each being in registry with. a. prong-receiving. opening. in the plate so as-to' engage a:.contact prong inserted. through. Said'opening, an. el'ec trica'lly. insulating. sleeve surrounding: said socket, extending beyond both of its ends. and inter.-

Landscapes

  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Connecting Device With Holders (AREA)
US741632A 1947-04-15 1947-04-15 Photographic light unit Expired - Lifetime US2549330A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL72934D NL72934C (en(2012)) 1947-04-15
NL676716802A NL139917B (nl) 1947-04-15 Inrichting voor de verwerking van kleurfoelies op een degelpers.
US741632A US2549330A (en) 1947-04-15 1947-04-15 Photographic light unit
GB10503/48A GB648418A (en) 1947-04-15 1948-04-15 Improvements in and relating to photographic light units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US741632A US2549330A (en) 1947-04-15 1947-04-15 Photographic light unit

Publications (1)

Publication Number Publication Date
US2549330A true US2549330A (en) 1951-04-17

Family

ID=24981522

Family Applications (1)

Application Number Title Priority Date Filing Date
US741632A Expired - Lifetime US2549330A (en) 1947-04-15 1947-04-15 Photographic light unit

Country Status (3)

Country Link
US (1) US2549330A (en(2012))
GB (1) GB648418A (en(2012))
NL (2) NL139917B (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958804C (de) * 1954-07-15 1957-02-21 Dr Arthur Gewehr Beleuchtungseinrichtung fuer photographische Zwecke
US2794906A (en) * 1954-06-16 1957-06-04 Harold E Edgerton Gaseous-discharge apparatus
US2825795A (en) * 1953-11-25 1958-03-04 Andrew F Henninger Flashtube mounting structure
US5452188A (en) * 1992-04-14 1995-09-19 Green; Timothy M. Modular strobe bar
US20140198250A1 (en) * 2009-01-29 2014-07-17 William Connor Delzell Modified system and method for obtaining photographic and/or videographic images

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1374832A (en) * 1919-09-27 1921-04-12 Connecticut Telephone & Elec Vacuum-tube base
US1677752A (en) * 1921-01-27 1928-07-17 Harry A Douglas Electric reflecting lamp
US2201853A (en) * 1938-01-28 1940-05-21 Gen Electric Socket structure
US2205672A (en) * 1938-10-13 1940-06-25 David F Sawyer Lighting element and fixture therefor
US2277698A (en) * 1941-05-13 1942-03-31 Herbert E Grier Flash-photography apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1374832A (en) * 1919-09-27 1921-04-12 Connecticut Telephone & Elec Vacuum-tube base
US1677752A (en) * 1921-01-27 1928-07-17 Harry A Douglas Electric reflecting lamp
US2201853A (en) * 1938-01-28 1940-05-21 Gen Electric Socket structure
US2205672A (en) * 1938-10-13 1940-06-25 David F Sawyer Lighting element and fixture therefor
US2277698A (en) * 1941-05-13 1942-03-31 Herbert E Grier Flash-photography apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825795A (en) * 1953-11-25 1958-03-04 Andrew F Henninger Flashtube mounting structure
US2794906A (en) * 1954-06-16 1957-06-04 Harold E Edgerton Gaseous-discharge apparatus
DE958804C (de) * 1954-07-15 1957-02-21 Dr Arthur Gewehr Beleuchtungseinrichtung fuer photographische Zwecke
US5452188A (en) * 1992-04-14 1995-09-19 Green; Timothy M. Modular strobe bar
US20140198250A1 (en) * 2009-01-29 2014-07-17 William Connor Delzell Modified system and method for obtaining photographic and/or videographic images
US9195117B2 (en) * 2009-01-29 2015-11-24 William Connor Delzell Modified system and method for obtaining photographic and/or videographic images

Also Published As

Publication number Publication date
NL139917B (nl)
GB648418A (en) 1951-01-03
NL72934C (en(2012))

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