CA2049011A1 - Device for the presentation of an image with a light-deflecting part - Google Patents

Abstract

ABSTRACT

A picture is presented simultaneously in any number of directions by arranging a grid (5) of parallel lamellae in front of the picture (1) - viewed from the position of an observer. An illuminating means can be fixed outside an image viewing part (120) which is rotatable about an axis (56) and comprises at least one light-reflecting part (4; 6; 16). At least one deflecting part (2; 3; 13; 24; 25) for deflecting light beams (10) - in particular for guiding the light beams (10) into the rotatable image-viewing part (120) - is provided between the illuminating means and the light-reflecting part (4; 6; 14), in addition to any lens system between the light source (32) and the deflecting part (2; 3; 13; 24; 25), or the axis of rotation (56) passes through the grid (5). The deflecting part may comprise an independently rotatable light-guiding part (2, 130) for rotating light beams about an axis parallel to the beam direction, in particular a Dove, Schmidt or Abbé rotating prism (2) or an angular mirror arrangement (130) having analogous inverting characteristics - and the picture (1) can be fixed so that it rotates rigidly, and is optionally continuously changeable by means of a picture control (70a). A projection screen (6) - preferably a transilluminatable one - is arranged in the beam path -in particular in the image projection plane - of the light beams (10) in the plane of a baseplate (7) of the viewing part (120) or (as known per se) at right angles to this, and a lens system (8) - preferably having an (optionally remote-controllable) focusing means (9) -is arranged after the deflecting part. If necessary, a deflecting part (3a, 25), connected to the viewing part (120) so that it rotates rigidly with the latter, deflecting the light beams (10), in particular through about 90° in each case, is provided instead of the rotating prism or in addition to it, and at least one mirror, in particular several mirrors (4n', 4n'') arranged at suitable angles with respect to one another, for projecting the particular image onto a plane lying in the axis of rotation, is or are provided, preferably in the viewing part (120).
(Fig. 12)

Description

r r 21~9~1 1 New p~ge~ 1 a~pa~atu~ ~
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~he inven~lon relate~ ~o an appara~u~ accor~n~
: 5 to the prechara~terlslng ~la~e o~ Cl~lm la ~0~ the purposes o thP lnYention, ~pparatuses a~e under~tood : ~s mea~lng exclu~ively ~ppa~atuses in whlch a p1~ure ~: or it8 image can ~e seen. Pro~ectox~, ~u~h as, ~or example, ~llm pro~ec~ors, which r~quire ~n external 19 ~creen are e~clude~.
~or the purpoRes of the lnvention, pic~u~e~
~re, fo~ examplet ~ran~parencie~, ~uch n~ 6lide~t txansmltted-lish~. LCD pic~res or the llke; ~ln~le~
~olou~ or multl~olour ~r~ght/dark mask~; fluo~e~cent lS ~creens, ~uch a6 ~r~nsill~mlnatable pro~ection ~reene, ; electrol~mine~cent ~reens, ~-eleris~on ~creen~ or the . like. A tran~illuminatAble pro~ectlon ~creen whlch A8 ~ far as pos~lble 1~ free ~f a~t~rglow 1~ a ~la8~ llk~
:~ ~hee~, ~or example ~ opal gl~8 ~hee~, whlch allows the image to app~ar.
~he rot~a~le plcutre vlewlng part, refe~red to ~. belo~ ~lmply ns ~he viewlng par~, lncludes ~ll p~rtg .. ~hlch are conne~ed ~o one ~nother, serve ~or all-round pre~entation ~ ~he plcture ~Ind can ~e dr$~en, ~or :~ ~S example by a motor.
~, For th~ purpose~ o~ the lnventio~, light-~a~lec~ing par~ are mlrro~ ~8 well a~ pro~ectlon . ~reen~, ~or ~x~mple in the orm of ~n ~nte~n~l ~creæn, ;. po3sl~1y also.r~lea~ed-ll~ht plc~ure~.
I~lu~ln~tln~ mean~ nders~oo~ a~ meanin~ the ~ ination o~ llgh~ ~our~e~, con~ve mlrro~ and :; condenæer o~ colli~ator l~nse~ whic~ ls ~08 ~d~anta~eous under the given condltion~ may ~l~o be ar~n~ed externally, ox exa~ple in ~he form of a slide pro~tor. Poæ~i~le llg~t sou~e~ are l~mps or radiation ~ource~ whlch emlt li~ht or radia~ion Whlch ~an ~e con~exted ~nto ligh~, for example ~l~o ca~hode ~ay tube~, llght ~mit~ing dlode arran~ement~, .. . .

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New p~ge: la electrolumine~cent plates or the like . A polnt-l ~ ke llght ~ource ~e uncler~tood A9 meanlngl a liqht ~ource hD.lrlng ~ ~m~ll lumlnous cen~e (e.g. an incande~cent c:oll) OI~ hlgh luminous ~eslæ1ty ~e.g. a haloqen 7amp).
S Th~ defle~tion part or deflectlng llgh~ beam~
i~ underQtood as Ine~nlng thos~ opklcal comp~nen~ whlch re~lect or ~frac - the lig~t ~am~ a~ lea~ on~e, . u~h .~
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New pA~e; 2 , ~c~r examp1e, mi~lror~, whl~h may al~o ~e l~alf-~llvered; prlsm~; flbre-optical w~veguides; lense~ or lens ~y~tem~, ln part~ lar ~; one of the ~bove-5mentioned ~eflec~lon p~rt~.
;~ ~he srld con~ o~ an arrangement o~ pa~llel l~mell~e. ~?0 88/~9~4C, the ~on~ent of ~hlch l~
~cln~ ~ clere1d ~ ein~ disclo~d in ~he context of the pxe#ent in~ntion, d~crlbes lt~ d~lgn ~nd ~unctlon.
10Po~lble llght ~ource~ ~re lampQ or radi~q~ion ~ources which ~amlt llght or ra~iat~ on wh~ c}~ c~an be convert~d lnto ~ight, ~or sxample a~o ca~hode r~y tuh~ ht emittlrlg diode arrangement~, ` e~ect~olumlne~cent plate~ or the ~ ~ke .
15Plctu~e dlsplays for ~he presentation o~ ~ ~wo-dlmenslona~ pl~ture over a vlewlng ~n~le of, fo~
exam1?le, 180 or 3~0 ~re lcnown, for example ~oln ~he U~S. Patent~ 4,760,443, 3,976,837, 4~4~1~2~0 ~nd - 3,3Z4,76Q, P~ Applicatlc)n WO ~/0954~ and ~ri~ish 20~a~ent ~,788, which are consideredl a~ b~ing dlsclos~d ln ~he cont~xt of thi~ appll~atl.on.
~` Partl~ul~rly the ~1 rs~-mentioned U~ S . Patent and ~h~ PC~ Appl~atlon descrlbe plcture ~i~play ~ tem~ whl~h ~unc~lon relativ~ly well in ~ome c~e~
2Sbut ~annot ~t b~ ed ~or all .requ~red ~pplic~tion~.
In n~o~t case~, the ligh~ sour~e i~ moun~d so that it 1~ 3ta~0nar~, ~9 ~ho~n, for example, ln Fi~. 3 to 5 ln U.S. P~tent- 4,7~0,443, becau~e of the incr~a~ed llfe of the ll~ht ~ou~ce an~ be~au e o~ the po~slble omls~:lon 30 ~of ~llp rin$~s or the llke. In 'c~le arran~ernent ~hown in ~lg. 2A, rotation of tlle 1;~1e~lon ~et ~105) ~hown ~hQre ~bout a ~rerti~al ~xi~ pa~ln~ throu~h ~t~ lm~e a~a pre~ent~ certaln problem~ wlth centrlfu~al force, power #upply~ B~nal ~upply~ et~. ~lect~onic ~otation ~5o ~he picture, as i~dlcated ln the d~cription, pre~en~ problem~ o~ln~ to ~he pos~lble a~er~low b~havlollr of ~h~ lum~ne~cen~ layer. However~ even m~re trou]~le~oms 18 the a~ ngement of a len~ matrlx on the , ~-`" 20~gOll N~w p~çle: 2~
~yllndrical ~creen~ ~e~t~ have ~hown tha~ su~h an rrangement le~d~ to very blurred lmages ~in~e suE;erpo~ltion of lmages oc~ur~ ln th~ field of v~s~on o~ an ob~erver.
5~he vaxl~nt ~o~n ln ~lg . â of U. S . Paten~

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4,760,443 has a static ligh~ source which throws the light via an inclined mirror onto a transmitted-light picture ~206) or a lamellar grid (15); since the latter, however, is fastened to the outer cylinder wall of a rotatable cylinder,.
the observer may perceive considerable blurring effects which render the picture unrecognisable, particularly at relatively high rotary speeds.

FigO 14 of WO 88/095~6 shows the rotating part of a 360 picture display with a static light source underneath.
The rotating part is essentially composed of light-guiding material and concentrates the light of the light source behind the transmitted-light picture. This makes replacement or changing of the transmitted-light pictures di~ficult.
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lS The picture display of U.S. Patent 3,976,837 is based on the principle of the variant of Fig. 2A o~ U.S.
Patent 4l760,443 and, for the same reasons given above, can be used only with reservations. Although the arrangement of the picture display according to U.S. Patent 4,431,280 permits a stereoscopic view of a picture, it is very i complicated owing to the very many individual moving and rotating parts.

The different variants of U.S. Patent 3,324,760 have a static light source which, however, must have a luminous intensity which is several times greater than that required by, for example, the variant of Fig. 3 of U.S.
Patent ~,760,443, owing to a very narrow observation slot.
In addition, because the amount of light reflected out of the drum is only small, the drum heats up to an inadmissible extent.

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, New page: 3a . In order to communicate a signal picture content, a :, multiplicity of film material is necessary to ensure that a continuously maintained picture appears. Furthermore, the picture has to be rotated in order continuously to appear the right way up to the observer. Several times the quantity of . film material is required to communicate a single picture ;~ content. :

In the apparatus shown in Austrian Patent 275,910, the rotationa1ly ~ymmetrio image of a rotating ~

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New p~; 4 ~o~y ~ shown a~ ~ three-dl~ensional phantom lmag~, ~hc opti~l pro~ec~ion ~y~e~ descr$bed contalns, a~ ~n e~sentlal part, a ~ove inver~lng p~i~m, Whlch i~
; 5 rota~d at half tha ~ngul~r v~lo~l~y comp~ed wlth a ~otatable ro~or whlch ~arrle~ ~ pxo~ec~lon surace.
q?he rotatln~, pro~e~ted ~pllt picture con~nunl~e~ a ; ~hree-dimen~lon~l image o~ tho rotAting bod~, whl h image can be vlewed from ~11 sld~. H~weve~, oniy - 10 rota~loinally ~y~metrl~ ~odi~ c~n be di~playe~ in ~his m~nner, but no~ exten~l~e plcture~, their ~ppeaxfln~e ing coYere~ by a ~or~ of grey haze ~nd the ed~
contollrs appe~ln~ unn~turaïly ~trong. .
~t 1~ ~he ob~e~t of thQ inventi~n to a~rold o~
1$ at least to re~uce ~11 the di~advantages descrlbed and ~o provide the pos31bllity of ~ ~pre~er~ ound~ -pl~ture pre~entation whl~h lS mechanl~ally ~mpler and hence les~ su~ceptlble to faults and in whl~h the pa~h of the llght beam~ can ~e varied w~thln wid~ llmlts ~0 dep~n~lng on ~he particular requl~ement~ an~ dl~fer~nt ~ppllaation~, ~n par~icula~ tendQd that b~tt~r ~ .

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- ~101~4 4a P1g73pc . . . ll~ht utlll~atlon ~nd more ~peciPlc plcture - illumlnation Are aahle~re~ wlth ~ tatlonary 1 ls~ht : ~ource. All llght should be }:rou6~ht l~ehlnd the plcture or to the ob~&nter ln order ~o avold ~ddi~ion~
: 5 ~e~le~tion loss~s ~t the ~onS of the plc~ure. It ~hould be po~lble to vary the luln~no~l~ intetl~lty l~r ~lmply ~han~in~ the llgh~ ~ouxce wlthou~ h~ving ~o ~1'cer the r~m~lnl~lg componen. ~. De~plte all ~ he me~hanical a~en~ly, ln pA~lcular tnountin~ o~ the ro~Atable plcture-vlewlrlg pa~t, ~hould be po~s~ble wlt~
relatlvely ~mall ~earlng diameter~
Su~pr~lngly, ~hl~ c~n b0 achleved ~ati~fac~orily :Cor the first time - for d~e~ent variant~ y Q com~lnatlon of th~ featurQe de~crlbed ~, 15 In clal~ 1. In contra~t ~o 'che known d~sl~n, thiB new cl~gign i~ ully ~unctlonal , do~aR not have the ~ta~ed di3ad-~an~ag~ ~nd rur~h4rmore perfQrms the o~her t~s~
The alte~nAt~te~ descrl~ed in ~lain~ 1 ~rl~e ~rom the following rel~lonshlp: ~ha interactIon o~ ~n 2û approxlma~ely polnt~ ce ll~ht laou~ae ~ith the ~!1Xi8 oÇ
ro'6;atlon or ~he lmag~-v~e~lng p~xt ~nd wlth ~ r~lector par'c which reflect~ ~he llght ~rriving from the reglon of the ~x~ o~ xo~tion l~ac~c through ~ pl~ne whi~h li ln ~he ~xi5 o~ rot~tion~ the g~d al~30 Ibelny p~rallel to thls plana, 1~ ~lecisiv~ ~o~ the lnventlon. ~I!hi~
lnteractlon aan be a~hleved, ac~ordlng t~ ~he .; in~rention, by an i~d~ptatio~ o~ ~he llght source ~or obtalnlng ~ r~arrow bund~e ~ y~ ha~ln~ an optLc~l . ~ axl~ wh~Gh i~ po~lt~,olle~ ln the axi~ of rot~tio~, or ~y 3U ~rr~n~in~ the liqht ~ou~ elf ~n th~ ~lhxl~ o~
ro~ lon, ln~lcle ~he ~ot~t~ble image-Ylewln~ pa~t i lt~lf.
In the flr~t cas~3~ it t ~ posslble to u~e tr~n~mi~ted~ ht pictuxe~ which ~re ~o be arranged 35 el~her ln th~ ~eglLon of the narrow llght ~undle or clIrectly ln ~he grid, ~r ~o provlc~e refl~ted~ 3h~
pi~uI~e-~l whlch 8~e n~ounted d~ rec~1y on t}l~ llght~

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., . . , . ' , ~ : '. ' . : , ' . , .. : . , , .~ ' , . . ,; . , ~ 2~9~ 1 - New page: 4b reflecting part - a distance away from the grid but directed toward the latter. If transmitted-light pictures (slides) are provided in the region of the narrow light bundle, these ~ 5 can be viewed themselves there or can be projected via a - subsequent optical system onto a projection screen which then occupies the position of the transmitted-light picture in the grid or of the reflector-light picture in the reflector part, as is evident from claims 2 and 3. The features of claim 2 also include the possibility of mounting a diffusion screen between the transmitted-light picture and the light source, said screen being useful when the transmitted-light picture is mounted directly in the grid. In such a case~ the diffusion screen serves only for better light distribution, -as, for example, the opaque back of a light-box transparency.

In the second case, it is possible to arrange transmitted-light pictures directly in the grid or to provide reflected-light pictures as in the first case.

Advantageous further embodiments and different variants of the invention are described in the defining clauses o~ the further subclaims.

The possibility of being ab]Le to view the same ` picture or its image (either real or virtual) simultaneously from any number of directions, including opposite ones, with th~ aid of an apparatus which has no external projection scxeen is ~ased, as already described above, on the principle that this picture or its image is rokated at high rotary speed - for example at more than 2400 revolutions per minute - about an axis, a lamellar grid being arranged in the axis of rotation. This grid also rotates, synchronously with the picture or its image, about this axis of rotation and thus ~ ;
permits the picture ...... only in a defined position with respect to the observer. Because of the lamellae and the rear wall . . , - :.
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:: s ~o~erlng, all o~her dlxe~iorls are darkened. .~he ~unctioning of sucil a l~mell~r ~rld i8 ~e~rlbed ln US-A-4,760,443, the conten~ of whlch is con~lder~d D~9 bein~ dl~closed ln khe ~nsext o~ thls ~e~cription.
, ~t l~ thus po3slble ~o allow the plctu~ lt~el~
to ro~ o ~chie~e ro~at~on of ~h~ plct~lre vi~
optical t:omponent~ or to ~llow ~he imag~ ~ real or ~ix~ual ) to xc~t~t9 .
For ~he ~ake of cl~rlty, ~he lndlvl~u~l flgur~s - lO will ln~ti~lly be descrlbad b~low fxom ~he poln~ of ~rlew of the~e overall co~non ~ea~ur~s; ~-he ~ e~en~
em~odiments will th~n be descrlb~d for aa~h lndi~ldual fi~l~re~ Part~ will bo mentioned wlthou~ ~n lndex where Shelr i~entlcal natu~e or thelr iden~lcal ~Eun~tion l~
impoxtan~7 the$r 1 ndices will be mentloned when it is ~ntende~ to re~ex to ~ ~pe~1 ic embodiment o~ unctlon~
~he path of some selected li~h~ beams is approxlm~ted Jy arro~ lO.
In Fig. 1 to 6, a transm te~ h~ pic~cur~
; ~0 or a reflected-llght plcture ~4 is rot~ted ~bout th~
axls of ro~ation 56. In Flg,. l, 2, ~a and 6, th~
pl~ture l o~ 14 ltself is; t~ansillu~i~ated or lllumlnated and ~he plctuxe p~eejente~ l~ vis~bl~ in ~ts nA ural ~ize. In Flg. 3~ plcture 14 i9 lilc~wise :' 25 r~ognlsAble ln lt~ na~ural ~.ze~ ~t 1~ 1~ not tha plcture its~l~ t~a~ 19 p~e~ente~ to ~h~ ob~erver ~ut :! ~he i~a~a vla a ml~ror 4. In Fi~. 4 and 5, wh~h can ;` be mor~ clearly under~too~ ~rom the de~crlptlon o~ Fi~.
9 ~n~ lO, ~ t~ansmltte~-light pl~ture l l~ rot~ted.
~he ob~e~vsr ~e~ the enl~ged i~age. ~hUc~ 1~ the pi~ure l or 14 ~lone ~8 ~ota~ed in the ca e~ ~hown ~n Fig. 1, 2, 2a and 6, ~he lmage 1~ addl~ionally rot ted In the example~ o~ Flg. 3 to S.
~ecau~e o 1~8 lamellae, the ~rld 5, whlch l~
arranged be~ween the pl~ture or lmage ~n~ the obs~er, causes th~ plctur~ or th~ Ima~e to ~e v~lble ~o ~he obs~rver only in the vlewing d~rection a~ rlght angle~

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to ~he plane of the picture o~ o~ ~he lmage. ~o~ thi~
pur~o~, lt rotate~ ~ynchronou~ly ~lth the plc~ure ahout ~he axi~ o rotatio~ 56, the ax~ o~ ~o~a~n 5~
pA~slng throu~h th~ "plane~ w~ich 1~ ~orm~d ~y the ~ld S , ~d i8 app~oxima~ely desl~nated ~9 a plane. In Fig. l, ~, 2a and 6 ~ 'I;he ~lX~8 0 ro~ation 5~ ~hu~ lles in ~h~
"plane"; ln Fi~. 3, ~ch~ ~rid 5c (dashe~l line~ m~y mounked el~he~ pax~llel to the pictur~ 14c or ~not ~hown) at ri~ht ~le~ to ~t, corre~pond1ns~ ~o ~ig. l, 10 2, 2a ~n~ 6. In t~e formar ~a~e, ~he ~ri~ "pl~ne" 1~
e.~ righ~ angle~ ~o t~e axl~ of rot~tion ~c, I.e. ~he ~ald axl~ pa~es thxou~h ~he said plane, And the qa~kenlng ef~e::t for ~he observer is effe~te~
ref lection at the mirxor 4~ . When the ~r~ d 5 i~
15 ~r~an~ed at xigh~ an~les ~co this, the li~ht ~e~ms pa~
t lea~c twice thro~s~h lt~ with the re~Ul t tha~ th~
. lumlnou~ in~en~lty of the plctllre 14c ~nd hence al80 the lumlnance of the image pxesented to the ob~erve~
are r~duced.
~0 Fi~. 1, 2, 2a, 3 and 6 show the viewing part ,~ 120, whl~h Is n~ounted, ~o tnat ~t ~an rotate ~bo~lt ~xl~
. 55, ln a housirlg 57 ( not shewn ln ~ig . 3 ) . ~he ~a~eplat~ l ~upports the grld ~nd the pictur~ 1 or 14 (Fi~. 1, 2, aa and 6 po~ ly ~lso Flg. ~ e ~ove);
orl~ice8 22 are pro~ded ~or holding optical component~
or for permit~lng ths p~s~age of light ~o lllumir~e the pictura 1 ~ 14 ~F.~g. l, ~, ~a~ ~ and fi) . Ml~rors 4 ~ox lllumlnating the pl~tuxe 1 ~Flg. 1, 2a and 6) o~
~o~ p~oduçing an image of th3 picture 14 (Fig. 3) ~re 30 provld~d in ~h~ viewln~ part; ln ~'ne variant ~ho~n ~n Fl~ uch a m~rror can be ~i~pen~ed s~ ~h . ~he vlewlng part 120 may he $n the ~oxm of ~ clo ed tube which ~arrie6 a r~flected-light plcture 14b or a mlrror 4~ or .4t ~ig. 2, 2tl ox 6) on part o~ lts lnn~r wall, 35 while ~he p~ whlch ~n be turned toward~ the ob~e~e~
mU~t b~ ~ransparent~ In order to ~ve ~el~h~, the vlewln~ pa~t 120 ~an, however, al~o be r~rlc~ed ~o ~ : :
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: 7 only the paxtlcular combinatlon o~ ~he followlng ; ro~a~lng parts: ~asepla~ 7, ~ri~ 5, ~irror 4 and pi~ure 1 or 14. ~he ~ylln~rlcal housing S7 is ; tran~paren~ in ~he ~8~10n ~ l coor~lnated wi~h the , viewlng pa~t 120, 80 that ~n obser~e~ has ~ free ~lew : of ~ho ~ota~able ~lewing part 120 and ~he pre~en~d p~ture from all v~ewlng di~ectlons right ~roun~ the ho~lng 57.
In the ~mbodlment~ ~hown ln Fig. 7 ~o 15, sota~lon of the plctur~ ls effec~-ed via op~ca~
~omponents, and th~ picture lt~el~ re~ain~ st~tionary.
~he ~asic principle 15 illustrat~d ~n Flg. 7. ~
rot~in~ pri~m 2~ whlch ls p~efer~bly ln ~he form of a Dove lnvortinq pri~m and can be ro~ted, a~ indicated by arrow 11, about an axls pa~allel to its ba~e, ~g prov1ded for ~-his purpos~. During such a rotat~on, ~hc - tran~mitted~ ht picture 1 1~ re~lsc~ed and i~-s l~age ~ppears ~ot~e~ thls occur~ing at twl~e the rotatlonAl equency. Tha rotated lm~ge, which i~ enlarged ln : 20 ~ome cases, 1~ presented to the observer vla l~n~
: ~ystem 8, or oth~r ~ able, op~l~al components, nfter pa~a~e through ~ d ~. Since the grld 5 m~t ro~a~e ~ynchronou~ly wlth the vl~lble lma~e, in thesa ~ase~
where ~ Dove ln~exting prlsm o~ a ~omponen~-~5 ~o~esponding to 1~ ~ p~esen1t tt ls necessary ~o ensure ~hat the rotary ~paed o~ the ~rid 5 - and he~ce ~ha~ of ~h~ vlewing pArt 120 - ls ~xac~ly twlce a~ hi~h aq th~ o~ the Dove lnver~in~ pri~m 2, unle~ ~pecl~l e~f~ct~ are to be achieYed by means of di~ferenk rotationa1 con~ltions.
In Flg. 7, t~le ax~ 0~ rotat~on 12~ of the Do~e prlsm 2f and the ~xls oP ro atlon 5~f o~ the vlewing par~ ~20f are not ld~ntlc~l; the pic~ure 1~ ls rota~ed by means of the Dove p~i~m ~, produced ~ en lma~e ~la an ~nver~lng p~lsm 3~ and a len ~y~tem ~f ~ h-dot line) on th~ ba~eplate 7f in ~he for~ of ~
pro~ectlon screen~ p~e~en~ed ~la a ~i~xor ~f through :
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- the lamellar ~rl~ 5f.
F~ hows ~he po~lblli~y ~f xepla~lng ~he ~ove pr~ ~m by t}~e ~om~lnatlon o~ ~u~a~ly ~r~nged mlrro~ 1. Rotation 0~ thi~ mlr~or conlPlnatlon ~k~3 5, pla~e ~l~out th~ aXi~ g, Whlch may, ~U~ need no~, ~olncide wlth the ~xls of ~o~a~lorl 56 of the view~n~
; ~ part 120 .
In Fig. g ~n~ 10, ~ ml~ror 25 is pro~ided lnstead o~ the invertln~ prlsm 3. 'rhe ro~atlng ~mage~
~`. 10 of ~he pict~re lh on p . s~age of the beams ~hrough the ~o~e p~i3m 2h c:an ~e ~3een in F~7. 9 ~rom the two bea~ns ~: 123 aln~ 124. q!ha~: po~ ion of the l~ove prlsm 2h' whlch ;! il; rc~tated ~hrough 901~ lncllc~ted ~y ~ dash-~ot line.
:' ~ig. 10 ~hows a sectlon ~chro-lgh the3e two ro~lon~l po~ltlon5 o the p~lsm ~h ~ncl 2h~ ~out the zlxlP~ of ~otat~on 122h.
F~g. ll to 15 show arra.n~ement~ in whiGh the `^ axis of rotatlon 1~2 o~ the Do~r& prlsm 2 colncldes with ;1 the axis of rota~ion 56 of the ~rlewlng par~ ~20 and hence al~o o~ ~he grld 5; plcture l is elther At rlgh~
~ngles ~o thi~ axl~ ~Fig. 1~) ox p~allel to it And i~
`.! ~eflec~ed vl~ a mlrror as 0~ an inverting p~i~m 3 ~nto the plane at rl~ht angle~ to the ~xl~ of rotation 122 or 5~ (Fl~. 11, 12 and 13~. Pi~ure 1 ls produced ~
29 an enla~ged lm~e by opt~c~l componen~s, excep~ in ~h~
~arlan~ ~hown ~ Fi~. 14.
In F~g. ll, this l~ e~ec~ecl vLa two m~rrorff~
.~ p~efe~ly a ~ombln~tion o a pl~ne n~1 xror 2Sl ~ ~nd a con~ex mlrxor 4i ~hich may ~e approximately clesl~nated 30 as such and who~ ~pecial curva~ure dete~mined ~mplrically o~ hy ~:alcul~tion ~ e~ an undi~tor'ced, enlarged lma~e of ~he plçture li on tlle ~ransilluminatable projection screen Si. ~e~e, the ~sepl~e 7i has ~n orl~ia~ 221 ln the form o~ ~ ~ector 3$ o~ a clrcle~ In rlg. 15 to~, mi~ro~ 2Sn ~nd 4n ~e al8o pro~ded, ~htch enlarge the lmag~ ln rotated b~
Dove prlsm 2n ~nd pxo~uce the ln~ag~ on a pro~ectlon i , , :~ . ' ' ' ' .', ' , ' , .' ~ ',, ,, . , ,, ' ' ~ ,, ' ' ' '. ' .

~c~een Gn whic~h 18 li~ewLse ~r~n~llluminat~
he arrangen~ant accordlng to F1~ , thl~
19 ~eplaced by e. ~ype o~ lnvert~n~ pr~sm 3~, the llgh em0~gence sur~ace 24~ of whi~::h Inu~ b~ ~uita~y foLme~
5 , ~ it 18 ~herefo~e indlcated by ~ ~a~h-~ot li~le) to ~roduce a sharp, enlarged imag~ of tbe pi~tura 1~ on the ~cre~n B~. A lens ~y~t~m will be provlded ~or ~h~3 purpo~e, the optica~ dlmenslon~ o~ whlch ~hould be ~dapted to the ~peci~ic ~lmenalorl~ of ~he apparatus.
Instead of the pro~ection ~creen ~ ls nlso . po~sible to pxo~rlde a mlrxor 4~, whi~h, howevex, w~ ll then pre~erAhly bo cur~e~, and adapted to the lens ~y~ten~ deslgnated conceE~ually by the light-Pm~rgence su~face 24i of the prism (thls embod~ment is not shown iTI Fig, 12) .
Fig. 13 ~hows ~ ~ariant ln which ~ ~sns ~ystem ;~ 8k lsi3 a:c~as~ged do~ stream of ~he Do~e prl~m 27c a~d - which pre~ents to the 0~3se~ver the enlarged, ~otated lmago o the p~ cture ~rom a pro~ection apparatu~ SOk, 2~ from a 'cransilluminatable pro~e~tlon ~cre~n 6k vla ~
mlrror 4k and th~ grld S~c.
~ig. 14 ~hows an a~ran~ment ln whlch only one half oP the imag~ 1~ pr~3en~ed s~i~ each Of two mlrror~
4m ~nd 4m~; as a re~ult o~ the ~otAtion ~bout the ~xi ~5 of ~otat~ on ~6m, th~ tot~l plcture 19 ~een. I~
~hown here, ~he viewln~ par~ 120m is no~ sux~otlncled by ~ hou~ing tube, th~ t~ansp~ent ~e~lon3 91k Pnd 91k~
each only ~xtend o~rer no more thiln hal~ the later~l ~ur~ace o~ th~ v~ewlng part 120nl ~nd ~r~ o~f~et with re~pect to ons ~nother. This ~xrang~ment is dl~tingul~h~d by a ma~ ~ls~ribution whlch ls ext~em~ly advantag~ous for the ro~ation; ~or other imaglng ~rran~emen~, this ~olution is not ~ually advanta~eou~
slnce it 1Y ne~esi~ry to en~ure ldentlc2ll ~m~lng conditlon~ for the ~artial pic~re~
Fl~. 16, 17 and 18 show po~lbllltiss for R~an~enlen~i~ in whlch the image l~i rotated bll~ the :.:

~: .

2 0 ~
`~ 10 ' picture r~m~ins ~ tlonary.
Rot~tion of ~he lm~ge Alone, ~lth~r vl~lbl~ ns ~lle ~ehl lmage on a liqht-r~flecting pa~ in the ~orn of ~ pro~ect~ on ~ en ~ or vlr~cuAlly via a mlr~or S , (light-re~lec:~lng part), 13 of in~eres~ only for ~re~r ~peci~ a~0~v If ~ picture 1 ls to be presented ln ~h~ ~ame manner ln ~11 vlewing direction~ rlgh~ round the ~lewins;l pa~t 120, ~he piGtUre 1 mus'c then comprlse a ro~tionally ~ymmetric xep~esen~tion. Howe~rer, i~
is of course al~o pos~lbllia that ln~e~s~ing e~ecss a~e de~ired pre~l~ely ~ a result o~ pxe~en~atlon o~ th~
~ture 1 l~y rotation ~g a ~unctlon of the vl~wlng d~lrec~-lon.
The statlonary plcture 1 is proc~uced ~s ~n i~nage on A pro~ectlon ~cre~n 6 via ~ul~a~le defle~tion . p~rts ~ and l~ns ~y~tems 8, or re~lected vl~ ~he mlrror . Fig. 16 shows only the vlewin5~ par~- 120p; the prlsm 3p wlth i~ speCially des~grled light-emer~6~n~e sur~ e 24p e~sentlally cor~e~pond~ to the prlsm 3~1 ~hown in Fig. 12 ~nd described above; the ~ame zlpplie~ ~o 'che em~otlment of ps~o~ectlon screen 5p of mixror 4p.
Fiq. 17 and 18 show analogou~ arrangement~, ~xcept in thi~ c~se the plcture ;l ~ t right angle~ or parallel to the axis of ro~at~on 56. I~ the ~i transmlt~e~-light pic~l,r~ ~q ~ho~wn in Flg. 11 ls ln thefo~m of a t~an~mltted~ ht (multlcolour) LC~
: possible ~o control ~hl~ via con~rol lines 71q ~y mean~
~f a con~rol p~t 70q. The transmitted~ ht ~CD
displ~ys ~ny p~ogramm~ble p~tllre~, ~lmll~x to ~ ~lide b~lt conv~ted lnto dlgltal ~lgnal3, the sald plctures be~n~ ~apable of ~elng transilll~mln~e~ llke conventional transmlt~ed-llght plctuxe~ 1. The el~ctroni~3 of the pi~ture control 70~ also mak~ it pos~lble to ro~a~e t~e LCD plctu~e electronic~lly, 80 3~ that no mecha~lcal apparatu~e~ ~re re~ x~d Ior rotatlon of the plctur~ ~q. ~he I,CD plctu~e rllust not .. . . . . ~ ~ ......................... , ~ . . -, .. ,.. .. . . .- .

2 0 ~ ., O :~ 1 : 11 rotated a~ntl~uo~ly bu~ in a 6~epw~)~e trunc~ted form, ~or ~xamp~e from 5 ~o 5, ynch~onou~l~ wlth the :: ro~ peed o~ the ml~or 4d. Any trou~l3~0me A~te~low 2~fec~s nlu~t be ~olded in o~er to ~rold S , ad~e~e ef fe~ on ~h~ de~ln~tion o~ the lm~e . ~e va~iant ~hown in ~ig. 17 $9 more or les~
"compl$mentary par'cner" o~ th~s cont~ol rran~Qm~n~, ~lnce l~o~h the pl~ure ~nd 1~ 1mA~e ~re r~tRted.
~he ~ nv~ntlve cle~ectlon p~xt e~enti~ ~or 10 pr~er~ation o the plcture oYel~ a ~olid a~gïe of 360 may take a very wide rar~ge o~ ~orms, a~ ls e~tldent ~om the ~l~ove de~crlpt~on of the indl~ldual f1qure~. ~hu~
~i ln the a~rangement~ corresponding to Fi~. 1, 2a, 1~, 17 and la, it ~ s ln the form of ~ deflectlon prl~ 3 1~ h~vln~ ~peclally ~h~ped light-emergence sur~aces 24; in the ~rrangement of ~ig. 2, a bundle of ~ibre-optical wave~uide~ 3b i~ provi :led in~tead o this . In ~lg . 7 and g-15, the deflection part ~s ln the 40rln of ~ l)o~re 1n~rertlng pri~m 2, ~ f nece~saxy ~upplemented by addltlonal optical def1ect10n par~s, such ~ a lens ~y~tem 8~ ~nd an inve~lng prlsm 3~ ~F1g. 7), a mirror 25~, 25i or 25n tFlg. lO, 11 an~l 15, re~pec~ely), an -, lnverting pri~m 3~ havlng a speclally ~ormed 1~ht-emergence ~ur~ace ~4~ ~ Fig . 12 ) or a lsn~ sys'cem 8k ~;` 25 ~ig. 13~. Fig. 8 ~how~ the pos~sibility of havlnS~ tha deflectio~ pa~ in ~he for~ o~ an angular ~l~ror ~ranqemen~ 130, whi~h has optlc~l propertie~ ~n~logous to ~ho~ o~ the DQva pr~m 2.
The overa~l desCript10n o~ ~he Figu~e~ i~rom the po~nt of view of identlcal functlonlng ln resp~t of the op~lcal pre~entatlon of the lmage wlll ~e comple~ed helo~ by the de~erlptlon of differing ~nd ldentlcal pos lble embodime~t~ and detail~.
.~he illumlnat~ng mean~ ~on~l~t~, in A known 35 ~nanner, o~ indlvidu~l conlponen~ which ~e used ln : di~exent co~blna~ions, depending on th~ desired or pr~ e~ ~nc~on or d~men ~ons. Llght so~rce 32, , , ~ .. .. ~ - .. ~

~` 2 ~

. 1~
~lliptlcal, par~bolic or hypsrboltc concave m~rror 33, if n~c~sary i~ the ~orm o~ a met~l oxide vaporlso~
rn$r~or, possible aspherlcal con~en~or len~e~ ~n~ 1~
ne~eg~ary also colllmator lens~ are com~in~ble. With ;~ 5 , the a~d of a~pherlc~l len~e~, the emltted llgh~ x i~
optim~lly colle~ted ~nd r~ained ~ox~ the llluminatlon p~oce ~. The as~hexlcal lens ~lape permlt~ ~hort ~ocal dl~n~es and ~mall apparatu~s lengths ~an t~ere~o~e be real$sed. It can al50 ~ ed to tran~mit parall~ï
light bundle~ wlthout addi~lonal int~rmadla~e lma~e~.
When ~hey are of a ~u~ table ~hap~, a~phexlcal lense~
~l~o mak~ it po~slb~e to pro~uce an lma~e o~ the l~mp ., ~ilament of the 1151h~ ~ource 32 wlthout ~pheric2~1 a~erra~ct on ~nd permit un~ form and brl~ht pro~cted ~ma~a~.
In most fl~ure~, the llluminatlng mean~ are ~hown purely sch~m~tlc:ally by a llght ~ource 32 ~nd a concave m~rror 33; for the 6ake ~f cl~rlty, the a~pherical len~os have not been shown; ~hese also could h~ve ~een omltted in the cases 6hown in F~ g. 2 and 6, ~ln~e directional t~an~ tmln~lon o~ a plctu~e 1 1~
not lmpbr~ant ~he~e~ In Flg. ~;, the li~ht ~ou~ce 32e of the illumlnat~ng m~ ns 18 in~erted lnto kh~ hou~lng 57e from above ~nd i~ partlally surro-~nded by a conc~ve mir~o~ 3~e whi~h is ~tened to the baseplate 7e, ~hich lr~ this c~se ls the upper co~rer plat~ o~ ~he viewln~
part 1~0c. Sult~bl~ n~ounted mlr~ors 4e And 4e' p~ovlde unl~orm tr~nslllumination o~ the pic~ure le. In ~lg.
2, the llgh~ ~ourcs 32b i~ once a~ain ~u~oun~ed by A
~0 conca~re ml~rcsr 33b, th~3 ~unction of whi~h l~ suppo~ted by ~ ~lvexed ~ollectin~ funnel~ 80b. ~he Ll~umlnating means ~IOw~ in Fig . 3 es~ent~ ally corresponds ~o hat de~cribed abova ~ut, wh~n a ~ransm~t~ed-light picture 14~ i~ u~ed, the ~pe~lal en~o~lment also o~fer~ th~ po~sibil~ty o~ ec~cin~
lllulnlnation ~xom a~ove ~y mean~ ~f an ex~nal llght gource (table lamp, celllng llght., sunll~ht, etc. ) .. . .

~=.. ~........... . . . . . .

.

2 ~

in~epe~ent o~ the hou~ing ~no~ ~hown) sux~s~undln~ th~
.~ vl~wlng pa~'c 120~
In Fig. 13, the lllum~ rlatin~ mean~ is located ln the ~llde pro~ec~lon appar~tu~ 5Qk which de~l~ct~
, ~he lma~ beams via an o~ifice, provlded ~or tpl~s pu~po~e, ln th~ ba~e of ~he hou~ing 57X on~o a ~lact~ng ~nlr~or 25k.
~he light ~eam emitted by the lllumln~tins means ~an ~e de~lec~ed b~ exy wid~ xan~ o~ op~ic~l compo~en~ ~nd combt nations ~horeof . ~ig . 1 ~nd ~A
~how the qolutions which re rel~tad ~o Fiq. 12, lG, ~7 and 18 bu~c where th~ light-emergen~e ~ur~ace 24A 0~ 2~t o~ the deflec~cin~ prlsm 3a and ~, re~pe~ti~ely, need n~t nlee~ op~lcal lmAglng condltion~ but mer~l~ h~ to 1~ de~lec~ th~ h~ ron~ the lllumlnating me ns ~s ~lfoxmly ~s po ~lble to the l~ght-refle~ting par~ 4a ~; or 4t. Fig. ~ shows, purely ~chematlc~lly, de le~ting part which throws the llght beam~ unlformly on~to the plctu~e 14b. A bund~e ~f optlc~l wavegulde~
~0 which is held~n the orific~ ~2b of the ba~eplate 7J~
and ~otated with the ~3ald ~aseplate, would be ! ad~anta~eous for thi~ pu~po~e.
To ensure a ~h~rp ima~e o~ the plcture l, :` f~cuslng means 9 should be p~ovided on ~he ~a~tous len~
8y tems 8 ~or on the len~ ~s~em to be coordinated with ~he light-emerg~nce ~u~fa~e 24~ or 24q an~ 24r of Fi~.
12 OI~ 17 and 1~), as lnclicated by a dash-do~ llne ln, ~or e~sample, Fiq . 7 ~ 9 f ) .
: . : Support ~hee~s ~5, wh~:h n~ay ~l~o pe~mlt irlse~lon and holdlng of A plc~ure! 1 ln ~ron~ o~ the çfrld 5 ~ehlnd ~hl~ when viewed ~rom ~he posltlon of ~he ob~Yr~rex), are advanta~æo~s for ~upportln~, ln parti~ular, a ~lexlbl~ gr~d 5 lnside the ylewin~ par~-1~0 ~Fl51. 2a, ~ , 17 ~nd 18). Ftg. 2 ~hows, ~o~
3~ examplel ~ ~xid 5h whlch as ~u~h 1~ rlgid and ~or whlch ;. no suppor~ sheet~ need be p~ovlded.
In Fi~ he g~id 5a i~ ~u~ppo~ed, ~t ~he .

. :, .. . . . :, . . ' . , . ~ , : . . . ...

2~ 01 ~ew p~ge: 14 ~lde ~cln~ ~ay ~rom ~he o~erve~, on a tr~næmltted-llght plcture la ln the ~or~ of ~ tran~mlt~ed-llght ~C~, Mnd ln Fi~. 11 and 15 on a ~ro~ect~on ~reen 61 ~n~ 6n, re~pect~v~, whlch 1~, ~or ~xample, ~n ~he $orm o~ an op~l g~a~ ~heet. Fl~. 6 show~ thAt ~ W
11~e~ ~e may be mounted ~tween th~ ~rld ~e ~nd a ~upport ~he~ 65~, ~he ~aid fll~ex ~eln~ provided ~o~
pxotect~ng ~he ob~erve~, part~ularly when arc di~cha~ge lamp~ ~re used a~ the lg~ht soure 32e.
~he ba~eplate 7 o~ the vlewing part 120 1B
dr~van ~y a drum drlve 62, ln mo~t c~ea by an el~c~ric ~otor. Regarding the very wlde rang~ o po~ble drive varl~t~0 ~ome Or ~hlch ere not de~rlbed in partic~lar ln thi~ appli~atlon, refer~nce may ~e made ~o EP-A-035794~, ~he content of whiah is considered ~s ~ein~
di~lo~ed ln the contex~ o~ ~hl~ appllca~o~. ~he ~aseplate 7 18 ~he~ePo~e ~lways ln~lrec~l~ or dlrectly rotatably mounted - ~or example vla ~ coupllng ~lange ~0 - in a dru~ bearing 54, ~8 ~ho~n ln ~lg. 1, a~ 2a, Ç, 12, 13, 15, 17 ~nd 18. ~he drum bearlng 64 is held by a drum holder ~3, wh$ah 1~ rl.gidly connec~ed ~o th~
hous~ng or to the ~ouslng tube 57. ~h~ rc,tD.tln~ paxt m~y havs, in 1~ upper ~e~ion, a ~ounter-be~rlng 64h ~5 (Flg. 15). How~ve~, thi~ i~ not es~entlal 1~ ~he rot~tin~ pa~t 1~ optlmall~ ~alanced. On the othe~
hand, the ~ounter-b~a~ing may ~l~o be arrAnged a ~econd bear~n~ - opt~onally in ~he fox~ o ~ewel bearin~ 105 - for example on an e~nded ~earlng ~ourn~ low ~he ba3~pl~te 7a (Fl~ ). In ~n or1fiae ln a d~um ~old~ ~3 ~l~ed to the hou~lng, a couplin~ flange 60, whl~h i~ positively conn~t~d to the gear ~heel 61 ~f the d~m ~r~ ro~tabl~
~ount6d Yia a flrum ~e~rlng ~4.
3~ ~hi~ drLve p~lnc~ple 1~ ~hown in Flg. 1~ ~ 2A~
12~ 15, 1~ and 18. In Fig. 2a, ~he mo~ox i~ rota~ed throu~h 90, with ~ ho~iæont~l axi~ o~ ~o~tlon. H~e, ~he d~$~e wheel 3~ drive~ the ~1ewlng part 120t via ~ouplin~ ~urf~ce 3~ provlded on khe underneath o~

~eplAte 7~.
'In the v~iant ~hown in Flsl. ~, ln whlch l:h~
llght ~our~e 32e i9 moun~ed ln~ide the v~awln~ pa~t 1~0~ ~ut in ~ ~tatic~ tubular lamp holder ~6e, the drum 5 , boarlng 6~ i~ suppor~ed by thl ~ lamp hold~r l~e . ~rhe ~a~eplat~ 7e i~ ~hu~ d~iven via ~hl~ dxum l~axlng 64e~
~hs viewlng par~ ~Oe iR connec~ed, ~ 8 ~id~ f~lng the base ~ cs hous~ng 57e, to ~he drlv~ ~h~ft 5Se o~
~he druln drlve 62e via ~ coupllng 46~. In th~
~rranSIement, ~he douk~le power ~upp~y line, whlch i~ to e provlded on -he one hand ~rom below - 72e - fo~ the . motor and on ~he other hand ~rom aboYe - 72e' - ~or ~helamp hol~0r ~6e, m~y prove to b~ dl~aqvant~eou~
Ei~her ~he ~ota~.~ ng p~ism 2 can be drlven by lt~ own pr~sm dr~ve 29 ~Flg. 10, 12 and 13) or ro~atlng pri~m 2 ~nd ~lewing part 120 can be driven together vi~
a frlctional or po~itlve t~ansmlR~lon s~ear ~Fig. 15~.
~he rotatln~ prlsm a 13 held ln a pxlsm hold~r ~ ~6, the outer ~lrface of whlch ls p~erahly in th~
~orm o the lateral ~urfacc of ~ cyllnd~r. ~he pri~m holdex 26 and henc~ the rotatins~ p~l~m ~ are r~t~t~bly mounted About ~n axls 122 or 5~j in the hous~ng 57 by mean~ of ~ prl~m ~earlng 27 arr~nged on ~hi~ out~r ~urfac~. A d~lv~ wheal 12G is ln contac~ wlth the : 25 prl~m holder 26 ~ia a co~plln~ ~;urface 138. The ~rlYe wheel 12 may h~ve d ~ tlon-incre~ln~ coatlng, for example ~n elastomer ~oatlng, or m~y be in the foxm o~
a pin~on whlch lnteracta wl~h diam~trically oppo~e~
; recesses ln ~he coupling surface 138. ~his en~ures exact hut noisiex drlvin~ o~ the rotating pris~, whl~h $~ not wl~hout problem~ p~r~icularly at hl~h rota~y ~p~ds~ The ~earlng nol~e whlch occurs a~ the~æ hlgh rotaxy ~peed~ 1~ a ve~y critical polnt and ~t is t:h~r~r~r~ ,y ~o ~ pt ~ ~ea~ ~ pc.4~.~ hl ~ ~.
~ompen~a~e e~e~y ~ccen~ricl~y by means o~ balancln~
~ welgh~ lB.
; ~he ~rrange~Qnt ~c~o~dln~ ~o Flg. 1~ ~haws fl -, , . " ., . , . , :

r~
204~
1~
po~ ibill~y ~o~ ~edu~ln9 ~he xe~ul~lng ~earin~ nol~e.
~o~ thi8 pu~pc:se, a ball bearlng 127k 19 provlded between tchat p~rt o~ t~e vlaw~ng part 120k whi~h corxes~ond~ to the bs~;eplate 7k an~ 1 driven b~ tha 5 , çlbar wheel ~lX of ~ d~ 5rive 62}c and the pr~3m holc~r 2~k, or in ~ Ca5e the holder o~ ~he lens ~y~tem 8k.
~ince 'chs pE~lsn hc~lder ~k And hen~Q ~180 the holder c>~
len~ ~y3tem 8k, ~h~ch i~ connectæd ~o the 8~cl pxl~m holder ~o ~ha~ ro~e~ rigldly wlth it, should 10 rot~e at ~nly half th~ f~quency - r0la~1ve ~o the ~îewl~g paxt 120k - ~he xot~ry speed ef ~ecti~e ~t ~he ball bearing 127~c i8 only half the valu0 o~ th~t for beArlng eorre~pondlng tv, ~or exa~ple" Flg. 15.
Anoth~r d~lv~, ~or plctu~e 1, lg ~hown in Flg.

4 ~r.d S. The plcture ld ln ~hls c:~se i~ held in a~
.. approximately di~c-shaped pictu~e holder 42~. ~he cl~cumf~rence of the plcture holder 42d 1~ in the ~orm o~ coupling ~urrace 38d and lie~ between, fox example, fiv~ ~oller~ 43~ w~ich a~e rotat~ly mounted ln a pi~tUxe holcler 44d ~lxed ~o ~he hou~ln~. ~ s~x~h roller serves ~s ~ dr~ve wheel 30d, whlch i~ driven by a picture ~ e 41d, via a belt 45 and ~elt pulleys 40 and 40b. The ~lcture holder 42~ and h~n~e the ~r~n~mltt~d~ ht plcture ld are ~otat~d ~out an ~xi~
, 2~ 56d, which i~ at ri~ht angles to the picture ~urace.
``~ Sprlng clampq, lockin~ ~m8 o~ the like ~whlch a~e not ~hown~ are p~ovided ~or ~lx~ng the tran~mitted-light pi~t~2 ld in tha plc~ure holder 42d.
; ~he plcture ld c~n ~lso ~e change~, as ~hown ln Fi~. ~ and 10 ~nd lndicate~ ln Fig. 12 ~nd 18. A
num~er o$ transmitted-light picture~ lb ~re ho~d ln gazlne 34 a~ the ~de of ~he pro~ectlon cham~er 31. . ~;
In8ertlon ~nd withdrawal or chang~ng of the plc~u~
are effected by ~ plc~ure-changln~ part 35, whlch l#
3~ ~hown ~che~ tlcally an~ ha~ a grlpping a~ 36. Fu~th~r transpoxt of the ma~azln~ is ef eected ~y ~ tran~po~t .
un~t 37~ ~hlch ~S llkewi~e only shown ~ch~m~tlcally and ,.

.

2 0 4 ~

whlch c~n be connect~d ln lo~lstlc termS wl~ h~
pl~tu~e-~hanglng part 35. ~he m~ga~lne 34 1~ ~hown a~
a stral~ht ~ox bu~ m~y al~o ~e in the fo~m of ~
~: carou~el magaz ~ ne . 'rhia would permi~c unln~e~rup~e~

5 , p~cture pre~entation ~or ex~mple ~o~ ~d~rer~ sing purpos~
Flg. 1 ~how~ a po~siblli~cy for chan~ins~ plcture 1 a~ ~uCh, ~hat, i~ to ~ay Wit~lOUt ~okatln~ lt. For ~ . .
thi~ purpo~e~ it 1~ ln ~he form o~ a t~ansmlt:k~d-llg~
LCD la, the plctur~ content o~ whlch ~an be changed Yia - ~ pLc~ure ~on~rol 70a. ~he coupl~ng ~l~n~e 60a . con~c~ins two concen~rtc ~lip r~ng~ 78a, whlch ~r~
' connected ~a current ~onductor 81a to ~ p~a~us~e rontrol 70a Whl~h 1~ fastened to ~he ba~eplate 7d ~nd indicated l;y d~h-dot lines and whlch in t~xn drl-re~
th~ LCD display via control lines 71a. Th~ #llp rln~
70~ and 'che ~taf lc brushe~ 77a supply the plc~u~e -. cantxol 7~a or the L~ tran~mi~cted-light pl~t~re la wl~h ~lectric power. ~he powe~ aupply co~ld, however, 20- al~o be provided lnduc~ively or autonomously - for , ~hort operatin~ tlmes - by mean~ o~ batter~e~ ln the ~otatin~ part~ Ins~ea~ of an LCD ~i~play, othe~
, transillumlnat~ble, elec~onlcally controlle~ dlsplays :1 may be u~ed. ~he pic~ure content of la can be 2S v~rtually freely selec~ed and changed by means o~
~uit~le con~rol commands. The pleture ~ont~ol 70a c~n ~lso contain a ~emory ~ith ~ lo~p, ~o tha~ thQ plctures can be chan~ed at prep~ogramm~ lnt~rval3.
- as ~hown - 81ip ring arr~ngements ~17, 78) ~0 are presen~ for power trans~lsslon, it is al~ p~ le ~o transml~ control slgnals, ~or examplP hlgh-~requ~ y cuxren~ pulse~ the llp rings fro~ a ~tat~
p~ctu~e ~on~rol 7~a'. Acco~dlngly, ~pply line~ ~rom plc~ure control 70A' tO brushes 77a ~e d~awn ln da~h-dot llnes. Alternat~vely ~o u~h a tran~ml~lan, ~nf~ared transmi~er~ 76a ~re po~sl~le, ~he transm~tterg belnq mounkl3d ln hole~ in the dr~m holder ~ . '' 2049~11 ., 1.~ ' 63a ~nd ~elng located oppos~te infrared r~cei~ser~ .7$a ~rom tlrne to tim~ du~ing ro~ation of the ~a~epl~te 7a, whlch r~e~elve~ anchored there ln hole~. By m~an~
o~ ~n arrangem~n~ of ~everal ~uch tran~mi~te~ and 5, re~eivers 76 ~nd 75, re~p~cti~ely, vlrtually an~ nu~er - of piece~ of lnform~tion ~n be tr~n~mitted wl~hout - i wlre~ to th~ plcture contrs:~l 70c . In~ared ~xansmlttçr~ and receivers could al~o be replaced ~y lnductive, c~pacitiYe or ~imllar trans~ ion 8y~tem3.
10The static pictl~xe control 70a' i5 corlne~ted vla aontrol lin~9 71a~ id outslde the ho-l3ing 57a, ~o ~ data lnp~l~ appa~atu~ 79a ( ~or exampl~ a keyboa~tl ar pc) ~ by means of which the plcture con~ent of 1~ can be changed.
15To remo~T~ the heat generated in th~
ill~tmlnating means du~ing operation, A coolln~ means mu~t be pro~rlded ln mo~t cases ~or the concave mlrro~
33 or light source 32. For thls p~trpose, for exampl~, quiet ax~al rolle~ f~n Can be u~ed a~ ~an ~oolln~ S4 ~0~nd ~oncen~ric coollng rib~ 85 ~an be ~ormed on 'che c:oncave nllrror 33 (~ae Fig. ~, ~ and 2a~. A ~iant in which the ~an cooling can be omltted is shown ln Fig.
~0, ~n which fan blade~ 58u ~re mounted ~elow the couplln~ flange 60u or provided in the form o~ a ~lngl~
~5unit and ro~ate w~ th the baseplate 7 or the prlsm 2 .
Since the cooling rlb~ 8Su of the Concave miXro~ 33u ,~ are p~rallel to th~ axis o~ rot:a~lon 56u, the ~ tlon dl~ec~ion ~hown by 2r~0w B~ ~8 rea~hed during rotation - of the fan blade~ 58~. Alr outlets 59~ ln ~he ~ase of 30the housLng 57u lncrease the effect~venes-~ of ~he ~ir ~t rcula~lon Fi~. 6 show~ vent$1atlon holes S9e lrl the l~mp hold~ e. ~he low~r pl~lte 15~ of the pic~uxe~ win~
part 120~ ha~ ~ir ~nlet hole~ 93e th~ough whl~h coollnç
.. ~S~r i~ blowtl ~y a fan cooling sys~em, whlch i9 no~
BhoWn, lnSo the spa~e behind the tr~n-~nlttecl-l~ght plc ur~ lu. Thl~ coolln~ alr ~lows p~t ~he ll~ht ;: , ' ' , r~,,, ",~", ,, ~,, "~ " "; , ",, 2 ~

~our~e 32u and escapa~ ~chro~lgll the ventlla~ion holes 59u in th~ l~tnp holder l~u. In~ead of an adclition~
~n cooling ~y5tem" the alr lnlet hole~ ~3~1 could be p~o~ded wl~h ~m~ll gulde ~ux~ac~s so ~ha~ ~r ~
5 , ~orced lnto the ~pace Yla th~se gulde sur~ace~ d~xlng xotation o~ the plctu~e~ wing pa~t 120u.
~urthersnore, lnf~ared-txan~parent de~l~cting mlrrors 2S or d~fl~tlng prlsms 3 may b~ pro~lde~ fo:r ~rotectln~ th~ ~lide 1 ~x fllm (Fig. 15) and opt~
component~ ~rom he~t.
~he not unlnterestlnq pos~lblllty o~ ach~evln~ - .
very wlde r~nge of ef~ect~ by dell~ate nonsynchro~ou~ xotation of p~cture vlewin~ pa~t 120 arld rotating ps~sm 2 o~ picture 1, whese A pictu~
lS xo~ating ~o~ example about lts own ~xls, can ~e pre~ented in any ~nclined po~ition ~o the ob~erve~, by ou~-o~-pha~ rotatlon o~ the baseplate 7 o~ of the ~otating prism 2. Sp~ed-~e~ul~lng c~r~ui~s, whlch are not ~hown and which pe~mlt random ~rarlatlon of ~otary speed~ in xela~ion to one ~no~her, ~ould have ~o be provlded for this purpose in the lndl~rld~al embodiments .
~he varlant~ shown lr. Fi.g. 4, 5, 10 and 13 c~n also be used A~ pro~ector~ alon~, withou~ ~u2~ther 2S defle~tin~ or guid~ m~n~ or wlthout further rotat~ ng p~8, ~uch a~ mlr~or~ and ~rld~, f~ee rotation of pxo~cted imag~ ~eln~ ~he novel fe~t~lre ~omp~red w~th the prior ar~. Thus, ~or ex~mple ~u~ln~ ~ ~llde lec~urs, ~ picture acciden~cally pro~ected upslde down ~an be rotated into ~he correc~ po~tion ~y mea2~ of ~in~le manip~latlon. In the past, it wa~ generally nece~ary ~o xemove ~he sl~d~ from the pI~o~ection chan~er, tuxn lt ~round ~nd inserk it ag~ln. ~.; .
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Claims (18)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. Apparatus for the apparently simultaneous presentation of a picture in any number of directions around an axis of rotation, having a grid of lamellae which are arranged parallel to the axis of rotation, the grid - viewed from the position of the observer -being arranged in the axis of rotation and in front of the picture within a picture-viewing part rotatable about the axis of rotation, wherein a stationary light source which is suitable for emitting light at least approximately in the form of a point is provided, which light source either is adapted by means of optical components in such a way that it is capable of emitting a relatively narrow light bundle around an optical axis which coincides with the axis of rotation at least in the region of the picture-viewing part below or above the grid, or is mounted inside the image-viewing part below or above the grid in such a way that its brightest point is as far as possible in the axis of rotation, the light source being coordinated with either an optical deflecting part or a concave mirror for deflecting the light rays or the optical axis into a light reflecting part interacting with the deflecting part or with the concave mirror, for further deflection of the light rays or of their optical axis back toward the axis of rotation or onto the grid, and where it is possible to mount, between the grid and the light source, a) a transparency (e.g. a slide) in the region of the narrow light bundle or b) a reflected-light picture (e.g. a paper photograph) in the region of the light reflecting part or c) a transmitted-light picture (e.g. a slide) in the region of the grid.

2. Apparatus as claimed in claim 1, having the picture (slide) in the region of the narrow light bundle, wherein a diffusion screen is arranged behind the grid - viewed from the position of the observer.

3. Apparatus as claimed in claim 2, wherein the diffusion screen is in the form of a projection screen, and the picture (slide) is arranged behind the optical deflecting part - viewed from the position of the observer.

4. Apparatus as claimed in claim 1, having the transmitted-light picture (e.g. slide or light-box transparency) in the region of the grid, wherein the picture can be mounted between the diffusion screen and the grid, or the diffusion screen - for example in the form of an opaque film - is connected to the picture (for example in the form of a light-box transparency).

5. Apparatus as claimed in any of claims 1-3, wherein, between the viewing part and the light source, the deflecting part comprises a light-guiding part, which can be rotated independently of the viewing part, for rotating light beams about an axis parallel to the beam direction - in particular a Dove, Schmidt or Abbé
rotating prism or an angular mirror arrangement having analogous inverting characteristics, and the picture can be fixed so that it rotates rigidly or can be rotated continuously in addition to the viewing part, optionally by means of a picture control.

6. Apparatus as claimed in any of claims 1-3 or 5, wherein a projection screen - preferably in the form of a back projection screen - for example a diffusion screen or opaque glass for deflecting the light rays by scattering, is arranged in the beam path - in particular in an image projection plane - of the light rays in the plane of a baseplate of the viewing part or (as known per se) at right angles to this.

7. Apparatus as claimed in any of the preceding claims, wherein a lens system - preferably having a remote-controllable focusing means - is arranged in the beam path of the light rays viewed from the position of the observer, after the deflecting part.

8. Apparatus as claimed in any of the preceding claims, wherein at least one deflecting part connected to the viewing part so that it rotates rigidly with the latter, for deflecting the light rays, in particular by about 90° in each case, is provided in the beam path of the light rays, after the deflecting part, and at least one mirror, in particular a plurality of mirrors arranged at suitable angles with respect to one another, for projecting the particular image onto a plane lying on the axis of rotation, for example onto the projecting screen resting against the grid, is or are provided, preferably in the viewing part (Fig. 15).

9. Apparatus as claimed in any of the preceding claims, wherein the deflecting part or a lens system downstream of this is designed to produce a wider beam.

10. Apparatus as claimed in claims 5 to 9, wherein the light-guiding part contains a rotating prism or an angular mirror arrangement, which prism or arrangement is present in a prism holder which preferably has the shape of the lateral surface of a cylinder and is rotatably held in a prism bearing - in particular in the form of a ball bearing - adjacent to which, at the outer surface of the prism, is a high-friction or optionally toothed coupling surface, which is engaged by a drive means, and preferably the speed of the rotating prism can be altered relative to the speed of the viewing part by random regulation of the prism drive.

11. Apparatus as claimed in any of the preceding claims, having a transmitted- light picture, wherein the transmitted-light picture - in particular in the form of a multicolor transmitted-light LCD - is arranged on a baseplate of the rotatable part approximately along the diameter of said baseplate - preferably at right angles - and can be altered by means of a first picture control which is mounted there and is optionally controllable by means of high-frequency control signals from a stationary second picture control which can be connected to a data input apparatus via control lines.

12. Apparatus as claimed in any of the preceding claims, wherein the deflecting part is arranged in the region of the axis of rotation of the viewing part, said deflecting part having a light-emergence surface which is directed toward the light-reflecting part and is optionally connected to at least one lens, preferably in the form of a single unit.

13. Apparatus as claimed in any of the preceding claims, wherein the deflecting part is composed of a large number of fiber-optical waveguides, the light-emergence surface of which is formed so that the light-reflecting part is exposed to the same luminous density over its surface.

14. Apparatus as claimed in claim 1, 4 or 11, wherein an orifice, through which the light source held rigidly in the axis of rotation projects and which is shielded by a semicylindrical reflector in such a way that light rays from the light source can enter only the region behind the transmitted-light picture, is formed in the baseplate of the viewing part, concentrically with respect to the axis of rotation.
(Fig. 6).

15. Apparatus as claimed in claim 14, wherein a light-reflecting part is arranged, inside the viewing part, behind the transmitted-light picture, in such a way that the light rays are reflected uniformly behind the transmitted-light picture, or the space behind the transmitted-light picture is silvered on all its surfaces which face the transmitted-light picture.

16. Apparatus as claimed in claim 14 or 15, wherein the light source is held in a - preferably tubular -lampholder which is rigidly connected to a housing cover and carriers, in its lower region, a drum bearing which, by means of its outer ring, is integrated in the baseplate of the viewing part, the reflector being connected to the baseplate of the viewing part so that it rotates rigidly with the latter.

17. Apparatus as claimed in claims 14 to 16, wherein the space behind the transmitted-light picture can be ventilated.

18. Apparatus as claimed in claim 3 or any of claims 5-10, wherein the projection screen is arranged in the plane of a baseplate or essentially parallel to it around the axis of rotation and at least one mirror is positioned at its side at an angle of 30-80°, in particular 45°, preferably the picture or at least the light rays being rotatable about an axis essentially parallel to them, while optionally present picture-changing or transport parts are statically mounted.