EP0858013A2 - Projektionsuhr - Google Patents

Projektionsuhr Download PDF

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Publication number
EP0858013A2
EP0858013A2 EP98200289A EP98200289A EP0858013A2 EP 0858013 A2 EP0858013 A2 EP 0858013A2 EP 98200289 A EP98200289 A EP 98200289A EP 98200289 A EP98200289 A EP 98200289A EP 0858013 A2 EP0858013 A2 EP 0858013A2
Authority
EP
European Patent Office
Prior art keywords
housing
clock
light
light beam
dial
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.)
Withdrawn
Application number
EP98200289A
Other languages
English (en)
French (fr)
Other versions
EP0858013A3 (de
Inventor
Daniel Johannes Van Eijk
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.)
PRESENT TIME BV
Original Assignee
Timelight BV
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 Timelight BV filed Critical Timelight BV
Publication of EP0858013A2 publication Critical patent/EP0858013A2/de
Publication of EP0858013A3 publication Critical patent/EP0858013A3/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/34—Position of the hands projected optically

Definitions

  • the invention relates to a projection clock comprising a housing with an emission opening for a light beam, which housing comprises at least a light source, a clock with a reflecting dial, and a lens, a light beam from the light source being at least reflected by the reflecting dial of the clock during the operation of the projection clock and subsequently leaving the housing through the lens.
  • the projection clock described in this publication comprises a housing which is provided with a(n incandescent) lamp at one side with a converging lens placed in front of the lamp, and which is provided with a reflecting dial at the other side.
  • the housing is coupled to a closing cover which is fitted with a diverging lens which is placed in line with the reflecting dial of the clock, while a converging element is arranged in line with the lamp.
  • a fan is also included in the housing.
  • the above projection clock has a number of disadvantages.
  • the housing must be comparatively bulky because the lamp must be positioned at a certain angle to and at a certain distance from the reflecting dial in order to achieve the desired reflection from the dial.
  • a fan it is necessary for a fan to be present in the housing to disperse and remove the heat generated by the lamp. Such a fan causes a noise which is often perceived as unpleasant.
  • the reflecting dial of the clock is so positioned in the housing that its removal and exchange, as applicable, can only be performed in a complicated manner, if at all.
  • the present invention has for its object to avoid the above disadvantages and accordingly provides a projection clock as defined in the opening paragraph which is characterized in that the housing is in addition provided with at least one light-directing member, while the light source, the reflecting dial of the clock, the light-directing member, and the lens are positioned in relation to one another such that the light beam is reflected both by the reflecting dial of the clock and by the light-directing member before the light beam issues from the housing via the lens.
  • the beam can be as it were "folded up", so that the space required in the housing, and accordingly the volume thereof, can be reduced.
  • the projection clock of US-A-5,247,492 is provided with a converging element which may be construed as being a light-directing element according to the present invention, there is a fundamental difference between these elements.
  • the converging element placed in line with the lamp concentrates and reflects light coming from this lamp, so that a single light beam is created which travels along the path described above. No "folding-up" of the light beam takes place here.
  • the light beam coming from the light source is reflected by at least two separate elements, i.e. the light-directing member and the reflecting dial, whereby the light beam is "folded up" and occupies a comparatively small space in the housing.
  • the refecting elements or members are placed in the path traveled by the light beam, whereas the converging element merely forms the source of the light beam in the projection clock according to US-A-5,247,492.
  • the light-directing member may comprise any member capable of guiding or reflecting a light beam such as, for example, a mirror, a prism, and the like.
  • the projection clock according to the invention is suitable for projecting the image of a dial of a running clock on, for example, a wall, ceiling, floor, staircase, or any other object.
  • the housing comprises a basic element on which a hollow body is detachably fastened.
  • all or some of the various components of the housing such as the light source, the clock with the reflecting dial, the light-directing member, and the lens are preferably coupled to or accommodated in the basic element, while the hollow body is fastened on the basic element so as to form the housing.
  • the basic element is at least partly open at the lower side and thus forms an open passage between the interior of the housing and the surroundings, while the hollow body becomes narrower towards its upper side.
  • Such an embodiment of the housing renders it possible to dispense with the use of a fan inside the housing, which offers advantages especially as regards noise pollution.
  • the clock with the reflecting dial is detachably accommodated in the housing, so that the clock with the reflecting dial can be taken from the projection clock in a simple manner and can be exchanged with a different one, if so desired.
  • a different picture can thus be projected each time through the exchange of the clock with the reflecting dial. Since in an advantageous embodiment the components of the clock are substantially coupled to or incorporated in the basic element, the clock with the reflecting dial is preferably detachably accommodated in the basic element.
  • the emission opening for the light beam is present at the upper side of the housing.
  • the housing Since the hollow body tapers towards the upper side and the lower side of the basic element is in open comunication with the surroundings, the housing has a comparatively great opening at the lower side and a comparatively small opening at the upper side. Such a chimney shape contributes to a good ventilation inside the hosing.
  • the housing is provided with a second light-directing member which is positioned such that said second member is in the path of the light beam when the beam issues from the housing.
  • a light beam issuing from the housing can thus be reflected by the second light-directing member.
  • the second light-directing member is coupled to the housing with rotation possibility about a spindle such that a rotation of said member about said spindle changes the position of the projection on an object.
  • Fig. 1 shows an embodiment of a projection clock 1 according to the present invention.
  • This projection clock smprises a housing 2 which is built up from a basic element 3 on which a hollow body 4 is detachably fastened.
  • the detachable fastening between the basic element 3 and the body 4 may be formed by mutually engaging fastening means or other coupling means known to those skilled in the art or generally known.
  • the basic element 3 is at least partly open at the lower side and is in addition provided with one or several support elements 6 by means of which the basic element 3 is as it were uncoupled from the ground surface and an open passage is created between the interior of the housing and the surroundings.
  • Such an open passage is important for the cooling of the projection clock, so that the use of a fan inside the housing is not required.
  • the hollow body 4 has a tapering shape towards the upper side, moreover, and is open at the top, the housing has a so-called chimney shape, so that an optimized cooling is provided by the shape of the hosuing.
  • the upper side of the housing 2 comprises an emission opening 7 for a light beam.
  • this opening 7 is provided with a second light-directing member 8 in the embodiment shown, which member comprises a mirror in the present example.
  • the second member 8 is coupled to the housing 2 with hinging possibility about a spindle 9.
  • the projection position of the dial on an object can be changed in that the second light-directing member 8 is rotated during the operation of the projection clock 1.
  • Figs. 2 to 4 show cross-sectional views of embodiments of the projection clock taken on the line II-II in Fig. 1.
  • the basic element 3 is shown diagrammatically only and not true to scale.
  • Figs. 2 to 4 moreover, only show one of the two assembling elements 17 between which the individual elements 10, 11, 12, 15, and 16 are positioned in the embodiments shown.
  • the element 17 may be provided with fastening means of various designs for achieving the fastening of the individual elements 10, 11, 12, 15, and 16 in the desired configuration.
  • the second, supplementary reflecting element 8 is always connected to a spindle 19 in Figs. 2 to 4. As was discussed above, however, the element 8 is preferably hinged about a spindle at the housing 2.
  • Fig. 2 shows a light source 10 which in the present example comprises a halogen lamp.
  • a lamp is preferred, it is alternatively possible to use a standard incandescent lamp, a concentration of the radiated light into a light beam taking place by means of a converging element as used, for example, in US-A-5,247,492.
  • the essential factor is that a beam of light is formed.
  • the light beam 14 originating from the light source 10 is directed at a clock placed vertically above the light source and having a reflecting dial 11.
  • the light beam 14 is reflected at an angle inter alia owing to the fact that the clock is obliquely positioned.
  • the reflection of the beam 14 is caused by the reflecting action of the dial, and possibly also by the reflecting action of the hands on the dial.
  • the light beam 14 then passes through a lens 15, which causes a centrally symmetrical mirroring of the image.
  • a lens 15 which causes a centrally symmetrical mirroring of the image.
  • the light beam 14 After passing through the lens, the light beam 14 is incident on a light-directing member 12 which is oriented at an angle such that the light beam 14 is directed vertically upward.
  • the light-directing member 12 comprises a mirror in the embodiments shown; it is alternatively possible, however, to use a different light-directing member such as, for example, a prism.
  • the light beam subsequently passes through a lens 16 which is placed in line with the emission opening of the projection clock, whereupon the image is reflected by the second light-directing member 8 and is projected onto an object such as, for example, a wall, a ceiling, a screen, etc..
  • Fig. 3 shows a preferred embodiment in which a light beam 14 coming from the light source 10 is reflected at an angle by the light-directing member 12 and is incident on the reflecting dial 11. From there the light beam continues at an angle through the lens 16 into the second light-directing member, where the light beam is reflected so as to be projected onto an object.
  • Fig. 4 shows an embodiment in which the light-directing member 12 comprises a one-way mirror.
  • a light beam 14 from the light source 10 passes fully through the non-reflecting side of the one-way mirror 12 up to the reflecting dial 11, where the beam is reflected and thus becomes incident on the reflecting side of the one-way mirror 12, whereby it is directed vertically upward.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Details Of Measuring Devices (AREA)
EP98200289A 1997-01-31 1998-02-02 Projektionsuhr Withdrawn EP0858013A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1005150 1997-01-31
NL1005150A NL1005150C1 (nl) 1997-01-31 1997-01-31 Projectieklok.

Publications (2)

Publication Number Publication Date
EP0858013A2 true EP0858013A2 (de) 1998-08-12
EP0858013A3 EP0858013A3 (de) 2000-09-27

Family

ID=19764322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200289A Withdrawn EP0858013A3 (de) 1997-01-31 1998-02-02 Projektionsuhr

Country Status (2)

Country Link
EP (1) EP0858013A3 (de)
NL (1) NL1005150C1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118748A1 (de) * 2011-11-08 2013-05-29 Alexander Degtjarew Projektionsuhr mit zwei Spiegel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5247492A (en) 1992-10-13 1993-09-21 Pan Chih H Projection clock

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE458982C (de) * 1928-04-23 Carl Bitz Taschenuhrstaender mit elektrischer Lampe
FR928330A (fr) * 1946-05-20 1947-11-25 Procédé de projection lumineuse d'un cadran horaire et dispositif de réalisation du procédé
DE840970C (de) * 1949-12-03 1952-06-09 Otto Dipl-Ing Schmidt Uhrzifferblatt-Projektionsgeraet
DE866028C (de) * 1951-05-19 1953-02-05 Otto Dipl-Ing Schmidt Uhrzifferblatt-Projektionsgeraet

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5247492A (en) 1992-10-13 1993-09-21 Pan Chih H Projection clock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118748A1 (de) * 2011-11-08 2013-05-29 Alexander Degtjarew Projektionsuhr mit zwei Spiegel

Also Published As

Publication number Publication date
NL1005150C1 (nl) 1998-08-03
EP0858013A3 (de) 2000-09-27

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