EP0454208B1 - Device for moving the luminous beam in a projector, in particular a medium or high-powered projector - Google Patents

Device for moving the luminous beam in a projector, in particular a medium or high-powered projector Download PDF

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Publication number
EP0454208B1
EP0454208B1 EP91200839A EP91200839A EP0454208B1 EP 0454208 B1 EP0454208 B1 EP 0454208B1 EP 91200839 A EP91200839 A EP 91200839A EP 91200839 A EP91200839 A EP 91200839A EP 0454208 B1 EP0454208 B1 EP 0454208B1
Authority
EP
European Patent Office
Prior art keywords
shaft
aforesaid
axis
projector
secured
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
EP91200839A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0454208A1 (en
Inventor
Baiardi C/O Space Cannon Vh S.R.L. Bruno
Parola C/O Space Cannon Vh S.R.L. Renato
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.)
Space Cannon VH Srl
Original Assignee
Space Cannon VH Srl
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 Space Cannon VH Srl filed Critical Space Cannon VH Srl
Publication of EP0454208A1 publication Critical patent/EP0454208A1/en
Application granted granted Critical
Publication of EP0454208B1 publication Critical patent/EP0454208B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • 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
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F21V21/30—Pivoted housings or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting

Definitions

  • This present invention regards projectors with a mobile luminous beam on a conical surface, in particular medium and high-powered projectors, which are used, typically but not exclusively, for outdoor advertising or for special effects for discotheques, large concerts, fairs, special events, etc.
  • the aforesaid projectors single or grouped on a single support platform, include substantially one or more projector bodies that rotate, supported by the platform.
  • the projector body holds the light source and all the necessary elements and accessories for creating the desired luminous beam; for example, the lamp, the lamp-holder element, the parabolic mirror, any cooling devices, the electrical terminal boards, etc.
  • the high-intensity luminous beam is made to rotate around the sky in such a way that its axis goes along a conical surface whose top angle is more or less wide.
  • a curved shaft is currently used that is pivoted to the support platform, and this shaft rotates around a fixed axis that is generally vertical or almost vertical.
  • the projector body in its turn, is pivoted to the upper end of the curved shaft with the axis in slanted rotation with respect to the first axis; special cylindrical springs connect the projector body to the platform in such a way as to obtain, during the rotation of the curved shaft around the first axis, the simultaneous rotation in the opposite direction of the projector body with respect to the curved shaft so that the projector body, though rotating its own luminous beam, substantially maintains the same orientation, and this because the presence of the electrical supply cables connected to the projector body prevents it from rotating around its own axis.
  • a device of such kind is shown in the patent document US-A-4298911. This technique still presents certain drawbacks that are mainly connected to the presence of the aforesaid springs.
  • the purpose of this present invention is to create a device that is able to make the luminous beam rotate in such a way as to overcome the above-mentioned drawbacks.
  • the projector body moves without any particular strain that is not caused by the normal (and insignificant) friction from the bearings. It is thus sufficient to have a less powerful motor, and the structure of the device itself can be less sturdy and heavy. In addition, there are no risks of breakage that could cause the projector body to rotate freely with respect to the shaft that supports it.
  • each projector includes a projector body 2 of the normal type, that is used to form a luminous beam whose axis is indicated by the letter L.
  • the lamp that supplies the light source supported by a lamp-holder element, any lamp cooling means, the parabolic mirror that projects the light within a limited beam, the electrical terminal boards, and all the other normal elements for an apparatus of this type; all of the aforesaid elements are no further illustrated or described in that they are of the usual type.
  • the projector body is supported by a support platform, indicated in all the drawings by the number 3, in which are located the switches for turning the projectors and other elements on.
  • a power supply cable 4 connects the projector body 2 with the platform 3 which is in its turn connected to electrical equipment (not shown) for control and transformation of the electrical current.
  • the device in question includes a rigid hollow shaft 10, secured to the platform 3 in such a way as to be able to rotate around a first fixed axis A.
  • the projector body 2 is secured to the shaft 10 in such a way as to rotate with the shaft around axis A and simultaneously be able to rotate in relation to the shaft around a second axis B which is slanted with respect to axis A.
  • the means 20 that are able to transmit the rotary motion around at least two axes slanted to each other.
  • the aftoresaid means 20 are fitted with their axes substantially coinciding with rotating axes A and B; in addition, the lower end of the means 20 is torsionally secured to platform 3 and the upper end is torsionally secured to projector body 2.
  • Other means 40 are included, which are capable of making shaft 10 rotate around axis A.
  • the rotation of shaft 10 produces the simultaneous rotation of axis B, around axis A, which defines a conical surface whose conicity is determined by the angle between axes A and B.
  • the means 20 keep the body 2 constantly oriented, regarding the rotation around axis A (thus there is a rotation of body 2 with respect to shaft 10, around axis B, equal and opposite to the rotation of shaft 10 around axis A) as is necessary because of the presence of cable 4.
  • axis L of the luminous beam produced rotates, defining a conical surface that can coincide or differ from the surface defined by axis B; if, for example, axis L coincides substantially with axis B, the two conical surfaces coincide, otherwise they are different.
  • shaft 10 includes a lower portion 11 that is coaxial with axis A, and an upper portion 12 coaxial with axis B.
  • the means 20 include a first shaft 21 that is coaxial with axis A, solidly bound to the support platform; in detail, shaft 21 fixed into a body 31 that is solidly bound to platform 3.
  • the means 20 also include a second shaft 22, coaxial with axis B, jointly secured to the projector body 2; in detail, shaft 21 is fixed onto a bracket 32 which supports the base of projector body 2, and the screw-locking elements 33 (of the usual type) tighten body 32 onto the upper end of shaft 22.
  • An articulated coupling joint 23 for example a Cardan joint, as shown in FIG. 2, connects the near ends of the two shafts 21 and 22.
  • the lower portion 11 of shaft 10 is connected to shaft 21 in such a way as to form a pin-bearing assembly with this shaft; in the same way, the upper portion 12 is connected to shaft 22 in such a way as to form a pin-bearing assembly with this shaft.
  • the two portions 11 and 12 are coupled to the respective shafts 21 and 22 by means of suitable pairs of rolling bearings 25 placed between a respective bushing 26, jointly secured to portion 11 and 12 respectively, and shaft 21 and shaft 22 respectively.
  • the means 40 include a gear wheel 41 secured coaxially to the lower portion 11 and connected, using a drive chain 42, to a second gear wheel 43 made to rotate by a geared motor (not shown).
  • the means 40 are housed under a box 34 that covers platform 3.
  • the entire shaft 10 is put into rotation around axis A by means of wheel 41; in the meantime, the articulated shafts 21 and 22 keep body 32 secured, with respect to the rotation around axis A, to platform 3; at the same time, shaft 22 can move with its own axis B which completes one rotation around axis A.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Projection Apparatus (AREA)
EP91200839A 1990-04-26 1991-04-10 Device for moving the luminous beam in a projector, in particular a medium or high-powered projector Expired - Lifetime EP0454208B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4683090 1990-04-26
IT46830A IT1239209B (it) 1990-04-26 1990-04-26 Dispositivo atto a muovere il fascio luminoso in un proiettore, in particolare un proiettore di alta o media potenza.

Publications (2)

Publication Number Publication Date
EP0454208A1 EP0454208A1 (en) 1991-10-30
EP0454208B1 true EP0454208B1 (en) 1994-12-07

Family

ID=11259346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200839A Expired - Lifetime EP0454208B1 (en) 1990-04-26 1991-04-10 Device for moving the luminous beam in a projector, in particular a medium or high-powered projector

Country Status (6)

Country Link
EP (1) EP0454208B1 (da)
AT (1) ATE115255T1 (da)
DE (1) DE69105600T2 (da)
DK (1) DK0454208T3 (da)
ES (1) ES2068483T3 (da)
IT (1) IT1239209B (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10100872A1 (de) * 2001-01-11 2002-07-18 Ltn Servotechnik Gmbh Vorrichtung zum Drehen eines Körpers um zwei Achsen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345382A (en) * 1943-02-01 1944-03-28 Cramer Bruce Illuminating apparatus
US4298911A (en) * 1979-11-30 1981-11-03 Pichel Industries, Inc. Lighting device for creating public attraction
US4344117A (en) * 1980-09-11 1982-08-10 Richard Niccum Searchlight reversing mechanism

Also Published As

Publication number Publication date
IT9046830A1 (it) 1991-10-26
DE69105600T2 (de) 1995-04-20
IT1239209B (it) 1993-09-28
ATE115255T1 (de) 1994-12-15
ES2068483T3 (es) 1995-04-16
DK0454208T3 (da) 1995-05-08
EP0454208A1 (en) 1991-10-30
IT9046830A0 (it) 1990-04-26
DE69105600D1 (de) 1995-01-19

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