DK168252B1

DK168252B1 - Projection and display apparatus

Info

Publication number: DK168252B1
Application number: DK390187A
Authority: DK
Inventors: Olof Oestberg; Takeda Tsunehiro; Iida Takeo; Fukui Yukio
Original assignee: Olof Oestberg; Takeda Tsunehiro; Iida Takeo; Fukui Yukio
Priority date: 1985-11-28
Filing date: 1987-07-27
Publication date: 1994-02-28
Also published as: NO170656B; NO170656C; NO873123L; DK390187D0; DK390187A; NO873123D0

Description

i DK 168252 B1in DK 168252 B1

Opfindelsen omhandler et billedprojektions- og udlæsningsapparat, der kan anvendes enten som overhead-projektor eller som en lysbilledprojektør.The invention relates to an image projection and readout apparatus that can be used either as an overhead projector or as a slide projector.

Til undervisningsformål er det kendt at anvende overhead-.For teaching purposes it is known to use overhead.

5 projektører, som imidlertid indebærer den ulempe, at de på en skærm projicerede billeder og figurer ofte er forvrængede. Endvidere er det vanskeligt at transportere og magasinere overhead-projektør-ark. Derfor fremstilles der stadig projektører til 35 mm lysbilled-10 bånd. En samtidig anvendelse af både en overhead-pro- jektør og en projektør til 35 mm lysbilledbånd indebærer vanskeligheder. Da endvidere den optiske bane mellem overheadprojektoren og lysbilledprojektøren overlapper hinanden i visse partier, må det ene af apparater-15 ne bevæges, eksempelvis skal overhead-projektoren fjer nes, når man skal anvende lysbilledprojektøren. Dette skaber problemer for manipulationen.5 floodlights, however, have the disadvantage that the images and figures projected on a screen are often distorted. Furthermore, it is difficult to transport and store overhead floodlight sheets. Therefore, floodlights are still manufactured for 35 mm slide-10 ribbons. Concomitant use of both an overhead projector and a 35 mm slide strip projector involves difficulties. Furthermore, since the optical path between the overhead projector and the slide projector overlaps in certain portions, one of the devices must be moved, for example, the overhead projector must be removed when using the slide projector. This creates problems for the manipulation.

Opfindelsen har til formål at tilvejebringe et apparat til udlæsning og projicering af billeder ved en selektiv 20 omskiftning til enten overhead-projektor eller lysbil- ledprojektør til afhjælpning af de nævnte ulemper.The invention has for its object to provide an apparatus for reading and projecting images by a selective switching to either overhead projector or slide projector to remedy the disadvantages mentioned.

Dette opnås for et apparat af den i krav l's indledning angivne art, der er udformet som angivet i krav l's kendetegnende del.This is achieved for an apparatus of the kind set forth in the preamble of claim 1 which is designed as set forth in the characterizing portion of claim 1.

25 Nærmere enkeltheder ved apparatet ifølge opfindelsen er angivet i krav 2 - 10.Details of the apparatus according to the invention are set forth in claims 2-10.

Opfindelsen forklares nærmere nedenfor i forbindelse med tegningen, der er en skematisk isometrisk og udtrukket afbildning af apparatet ifølge opfindelsen.The invention is explained in more detail below in connection with the drawing which is a schematic isometric and drawn view of the apparatus according to the invention.

30 Apparatet ifølge opfindelsen omfatter som vist en lys- 2 kilde 1 og et stråleprojicerende organ 2 omfattende en linse 3 og et spejl 4. Lyskilden 1 er omgivet af et halvkugleformet spejl 31. For at muliggøre en selektiv omskiftning til anvendelse af enten en første lysba-5 ne 6 eller en anden lysbane 7 mellem lyskilden 1 og stråleprojektionsorganet 2 er der anbragt et halvspejl 9, der opsplitter lysbanen i to dele. Halvspejlet 9 er anbragt i en stilling umiddelbart foran lyskilden 1 efter en kondensorlinse 8.The apparatus of the invention, as shown, comprises a light source 2 and a beam projecting means 2 comprising a lens 3 and a mirror 4. The light source 1 is surrounded by a hemispherical mirror 31. To enable a selective switching to use either a first light source 5 ne 6 or another light path 7 between the light source 1 and the beam projection means 2, a half mirror 9 is arranged which splits the light path into two parts. The half-mirror 9 is placed in a position immediately in front of the light source 1 after a condenser lens 8.

10 De fra lyskilden 1 udsendte lysstråler passerer derfor langs den første lysbane 6 og derefter gennem et overhead-projektor -ark 16, medens lysstråler gennem den anden lysbane 7 passerer igennem en lysbilledstrimmel 23, før en af disse stråler projiceres imod en (ikke 15 vist) ekstern skærm af stråleprojektionsorganet 2.Therefore, the light rays emitted from the light source 1 pass along the first light path 6 and then through an overhead projector sheet 16, while light rays through the second light path 7 pass through a light strip 23 before one of these rays is projected onto one (not shown 15). ) external screen of the beam projection means 2.

Den første lysbane 6 er forsynet med en Fresnel-lin-se 13, en gennemsigtig varmeabsorberende folie 14, en lukker 15 med flydende krystaller, som åbnes og lukkes af en på lukkeren påtrykt spænding, og overhead-projek-20 tør-arket 16, hvilke komponenter følger efter en lin se 11 og et spejl 12. Derefter passerer lysstrålerne gennem et halvspejl 17 og når hen til stråleprojektionsorganet 2, der er anbragt umiddelbart efter halvspejlet 17.The first light path 6 is provided with a Fresnel lens 13, a transparent heat-absorbing foil 14, a liquid crystal shutter 15 which is opened and closed by a voltage applied to the shutter, and the overhead project 20 dry sheet 16, which components follow a line 11 and a mirror 12. Thereafter, the light rays pass through a half-mirror 17 and reach the beam projection means 2 located immediately after the half-mirror 17.

25 Som følge heraf styres de lysstråler, der passerer gen nem den første lysbane 6, af lukkeren 15 med flydende krystaller mellem lyskilden 1 og stråleprojektionsorganet 2. Kun når lukkeren 15 er åben, kan stråler fra lyskilden 1 derfor projiceres imod den eksterne skærm 30 af projektionsorganet 2 gennem overhead-projektør-ar-ket 16.As a result, the light rays passing through the first light path 6 are controlled by the shutter 15 with liquid crystals between the light source 1 and the beam projection means 2. Only when the shutter 15 is open can beams from the light source 1 be projected onto the external screen 30 by the projection means 2 through the overhead floodlight sheet 16.

På tilsvarende måde er den anden lysbane 7 forsynet med en linse 20, et spejl 21, en linse 22, en lysbilled- DK 168252 B1 3 projektør 23, linser 24 og 25, en gennemsigtig varme-absorberende folie 26, en lukker med flydende krystaller af samme art som lukkeren 15, og et spejl 28. Desuden er den anden lysbane 7 forsynet med et spejl 29, der 5 reflekterer stråler fra spejlet 28 hen imod halvspejlet 17 således, at stråler reflekteret af halvspejlet 17 kan overføres til stråleprojektionsorganet 2. Som følge heraf kan lysbanen mellem halvspejlet 17 overføres til projektionsorganet 2. Som følge heraf er lysbanen mellem 10 halvspejlet 17 og stråleprojektionsorganet 2 fælles for den første og den anden lysbane 6 og 7. Linserne i den første og den anden lysbane 6 og 7 tilvejebringer i det væsentlige den samme skalafaktor for billedet, så at de på den eksterne skærm udlæste billeder kan 15 blive af næsten samme størrelse for begge lysbanerne.Similarly, the second light path 7 is provided with a lens 20, a mirror 21, a lens 22, a slide projector 23, lenses 24 and 25, a transparent heat-absorbing film 26, a liquid crystal shutter. of the same kind as the shutter 15, and a mirror 28. In addition, the second light path 7 is provided with a mirror 29 which reflects rays from the mirror 28 towards the half-mirror 17 such that rays reflected by the half-mirror 17 can be transmitted to the beam projection means 2. As Accordingly, the light path between the half-mirror 17 can be transmitted to the projection means 2. As a result, the light path between the 10-mirror 17 and the beam projection means 2 is common to the first and second light paths 6 and 7. The lenses of the first and second light paths 6 and 7 provide in the substantially the same scale factor for the image, so that the images read out on the external screen can be of almost the same size for both light paths.

Det bemærkes, at de varmeabsorberende folier 14 og 26 beskytter lukkerne 15 og 27 med flydende krystaller imod varme fra lyskilden 1.It is noted that the heat absorbing foils 14 and 26 protect the closures 15 and 27 with liquid crystals from heat from the light source 1.

Dett beskrevne apparat kan anvendes både som overhead-pro-20 jektør og som lysbilledprojektør. Når apparatet skal anvendes som overhead-projektør, åbnes lukkeren 15 i den første lysbane 6, og lukkeren 27 lukkes. Derved vil lysstråler fra lyskilden 1 passere gennem den første lysbane 6, og billedet på overhead-projektør-arket 16 25 projiceres imod den eksterne skærm af spejlet 4 i stråleprojektionsorganet 2. Når apparatet derimod skal anvendes som lysbilledprojektør, lukkes lukkeren 15 i den første lysbane 6 og åbnes lukkeren 27 i den anden lysbane 7.This apparatus described can be used both as an overhead projector and as a slide projector. When the apparatus is to be used as an overhead floodlight, shutter 15 is opened in the first light path 6 and shutter 27 is closed. Thereby, light rays from the light source 1 will pass through the first light path 6, and the image on the overhead projector sheet 16 25 is projected against the external screen of the mirror 4 in the beam projection means 2. On the contrary, the apparatus is to be used as a slide projector, the shutter 15 in the first light path is closed. 6 and the shutter 27 opens in the second light path 7.

Derved vil lysstråler fra lyskilden 1 passere gennem 30 den anden lysbane 7, og billedet fra lysbilledstrimmelen 23 reflekteres af spejlene 28 og 29 og halvspejlet 17 og hen på stråleprojektionsorganet 2, før det projiceres hen på den eksterne skærm af spejlet 4. Da skalafaktoren for det optiske system til anvendelse med lysbilledpro- 4 jektøren er indrettet til at være i det væsentlige lig med skalafaktoren ved anvendelse af overhead-projek-tør-arket, er det muligt ved anvendelse af apparatet ifølge opfindelsen at projicere og udlæse det tilstræb-5 te billede med næsten samme størrelse, uanset om det projiceres gennem den ene eller den anden af lysbanerne 6 og 7.Thereby, light rays from the light source 1 will pass through the second light path 7, and the image from the slide strip 23 is reflected by the mirrors 28 and 29 and the half-mirror 17 and onto the beam projection means 2 before being projected onto the external screen of the mirror 4. Then the scale factor for it optical system for use with the slide projector is arranged to be substantially equal to the scale factor using the overhead project dry sheet, it is possible, using the apparatus of the invention, to project and read out the desired image of almost the same size, whether projected through one or the other of the light paths 6 and 7.

Foruden det ovennævnte beskrevne lysbaneomskifterorgan kan der anvendes andre udførelsesformer for disse organer. 10 Eksempelvis kan der anbringes mekaniske lukkere ved periferien af linserne 11 og 20. Alternativt kan konden-sorlinsen 8 opstilles i et stråleprojicerende hul udformet i en del af den reflekterende spejlplade 31 med sfærisk hulprofil, når pladen 31 fuldstændigt omgiver 15 lyskilden 1. Alternativt kan opbygningen omfattende lyskilden 1, den reflekterende plade 31 og kondensor-linsen 8 opstilles ved halvspejlet 9, så at stråler kan sendes gennem den ene eller den anden af lysbanerne 6 og 7 ved at dreje opbygningen 90°. I en ændret udførel-20 sesform kan der anvendes et specielt spejl i stedet for halvspejlet 9 til valgfri udvælgelse af lysbanerne · 6 eller 7 ved at bevæge spejlet ind i eller ud fra lysstrålerne fra kondensorlinsen 8 til forplantning af strålerne gennem den pågældende udvalgte lysbane. Appara-23 tet ifølge opfindelsen kan også let fremstilles ved at ændre en konventionel overhead-projektør eller en lysbilledprojektør af den markedsførte type.In addition to the light path switching means described above, other embodiments of these means may be used. For example, mechanical closures may be provided at the periphery of lenses 11 and 20. Alternatively, the condenser lens 8 may be arranged in a beam projecting hole formed in a portion of the reflective mirror plate 31 with spherical hole profile when the plate 31 completely surrounds the light source 1. Alternatively, the structure comprising the light source 1, the reflecting plate 31 and the condenser lens 8 is arranged at the half-mirror 9 so that rays can be transmitted through one or the other of the light paths 6 and 7 by rotating the structure 90 °. In a modified embodiment, a special mirror may be used instead of the half-mirror 9 for optional selection of the light paths · 6 or 7 by moving the mirror into or out of the light rays from the condenser lens 8 to propagate the rays through the selected light path. The apparatus of the invention can also be readily manufactured by changing a conventional overhead or slide projector of the marketed type.

I en ændret udførelses form kan lukkerne 15 og 27 åbnes samtidigt til at overlejre billederne fra lysbilled-30 projektøren og overhead-projektør-arket.In a modified embodiment, the closures 15 and 27 can be opened simultaneously to superimpose the images from the slide 30 floodlight and the overhead floodlight sheet.

Claims

A projection and readout apparatus comprising a light source (1, 31, 8) for emitting light rays and a projection means (2, 3, 4) for projecting the light rays towards an external screen, characterized in that the apparatus comprises: a first light path (6) with an overhead projector sheet (16) for display readout, a second light path (7) comprising a screen strip (23) for readout on screen, 10 guide means (9, 17) for selectively directing light beams against one or both of the light paths (6, 7), shutter means (15, 27) which either close or completely open the light rays in the light paths (6, 7), and a combination means for combining the light paths (6, 7) to passage of the light rays to the projection means (2, 3, 4).

Apparatus according to claim 1, characterized in that the shutter means (15, 27) are formed as liquid crystals shutter inserted in each light path (6, 7) and controlled by an electrical voltage to selectively prevent or enable the passage of the light rays.

Apparatus according to claim 2, characterized in that the shutter means (15, 27) are formed as mechanical screens for insertion into the light paths (6, 7) to prevent the passage of the light rays. DK 168252 B1 6

Apparatus according to claims 1-3, characterized in that the guide means (9, 17) comprise a first half-mirror (9) which divides the light rays from the light source (1, 31, 8) into two equal parts passing through each 5 its light path (6, 7).

Apparatus according to claims 1-3, characterized in that the guide and shutter means are the light source (1) arranged to be adjustable in two different directions by rotation or offset by displacement to direct the light rays into one of the two light paths. (6, 7), thereby controlling the light rays in the relevant light path.

Apparatus according to claims 1-3, characterized in that the guide and shutter members are a mirror which can be moved between an retracted position, where light beams can pass straight through to the first light path (6) and a projected position, where the light rays are reflected to the second light path (7).

Apparatus according to claims 1-6, characterized in that the combination means is a half-mirror (17).

Apparatus according to claims 1-7, characterized in that the combination means is a mirror which can be moved between a retracted position, where the light rays can pass from the first light path to the projector element, and a deferred position, where the light rays are reflected from the second light path for the projection body.

Apparatus according to claim 2, characterized in that the liquid crystal closures (15, 27) are protected by a transparent heat-absorbing foil (14, 26). 30

Apparatus according to claims 1-9, characterized in that each light path (6, 7) is provided with picture elements such as mirrors and lenses for projecting the over-head projector sheet and the image strip onto the external screen with same dimension size.