DE2027839B

DE2027839B - Roller blind for camera shutters

Info

Publication number: DE2027839B
Authority: DE
Inventors: Lennart Gunnar Oskar Vastra Frolunda Dahlgren (Schweden)
Original assignee: Hasselblad, Fritz Victor, Dr , Göteborg (Schweden)

Description

stärke aufweist Versuche haben gezeigt, daß ein ge- F i g. 2 eine vergrößerte Seitenansichthas strength Experiments have shown that a ge F i g. 2 is an enlarged side view

färbter, vorzugsweise schwarzer Kunststoff der Poly- Fig. 1. stellte gestreckte Rollo bestehtColored, preferably black plastic of the poly- Fig. 1. Set is made of elongated roller blind

esterart oder eines gleichwertigen Materials besonders Das in F ι g. 1 dargesi _K» ^g,,^ _z ß. einerester type or an equivalent material, especially the one shown in FIG. 1 dargesi _K »^ g ,, ^ _z ß. one

vorteilhaft ist. Die Rillen machen das Kunststoffrollo erfindungsgemaß aus ein« ^ gleichen Abstän-is advantageous. According to the invention, the grooves make the plastic roller blind out of equal spacing

gegen Durchbiegungen senkrecht zu seiner Bewe- 5 Polyesterfolie od. a., unu« _verseher,_; die sichagainst deflection perpendicular to its movement 5 polyester film od a, UNU _{_{"verseher,..;}} which

gungsrichtung genügend widerstandsfähig und verhin- den ^^rdne'™°„ erstrecken, wie dies durchdirection of travel sufficiently resistant and prevent ^ ^rdne '™ ° "extend like this through

dem dadurch eine nicht kontrolüerbare Faltenbil- senkrecht zur fouencanii _. _2angedeutet ist .Diewhich results in an uncontrollable picture of folds perpendicular to the fouencanii _. _{2 indicated} is .The

dung. Das Material ist dauerhaft und wird nur gering- den doppelkoprigen rieu ω B^ ^ _Durch_manure. The material is permanent and is only slightly double-headed rieu ω B ^ ^ _by _

fügig von Temperaturschwankungen nachteilig beein- erforderliche Wiaeisranu» «^ _{des RoUüS} ^d flußt. Außerdem ist es fest, biegsam, verhältnismäßig io biegen senkrecht ²^JT" _erhalten während diedue to fluctuations in temperature adversely affected Wiaeisranu "" ^ _{des RoUüS} ^ d flows. Besides, it is firm, pliable, relatively io bend perpendicularly ² ^ JT " _obtained during the

leicht und ausreichend elastisch. Diese vorteilhaften durch die erhabenen i."¹ _erwünschte Verminderunglight and sufficiently elastic. This advantageous reduction _desired by the raised i. " ¹

Eigenschaften ermöglichen die Herstellung sehr dün- vertieften Teileil· tür BewegungsrichtungProperties enable the production of very thinly recessed part parts for the direction of movement

ner Roilos mit einer Gesamtstärke von etwa 0,10 bis der ^WldersmdstM1ff V.' übergang über die RoI-ner Roilos with a total ^thickness of about 0.10 to the WldersmdstM1 ff V. ' transition over the RoI

0,12 mm, wobei die vertieften, die Rillen bildenden des J^/gg£S£5S« (nkht gezeigt) zu er-0.12 mm, the deepened grooves forming the J ^ / gg £ S £ 5S «(not shown) to be

Teile nur etwa 0,01 mm stark sind. x₅ ^e? ,^¹^ übergang zwischen den vertieften undParts are only about 0.01 mm thick. x ₅ ^e ? , ^ ¹ ^ transition between the recessed and

Gemäß einer Weiterbildung der Erfindung können leichtern. Der υ°^^η,^Β _{R llos ist} abgeschrägt, um auch auf beiden Seiten der Kunststoffolie Rillen vor- den erhabenen Teilen des j«m e .According to a further development of the invention can lighten. The υ ° ^ ^η , ^Β _{R llos is} bevelled in order to create grooves on both sides of the plastic film in front of the raised parts of the j «me.

gesehen sein, die in diesem Falle jeweils sich gegen- an ^d™.^Üb^_Ig!S_chte mechanische Beanspruüberliegen oder gegeneinander versetzt sind. Sind sie tion, d. n. eine ^u™™" . _vertieften Teile 4 sind, wie versetzt angeordnet, so verhindert man, daß die RiI- ao chung zu verrunaern. . .._ß. stärke, wie auch len, d. h. die vertieften Teile und die erhabenen Teile die F ι g. 2 zeigt, von gieicni s beim Aufwickeln des Rollos zu einer Spule zueinan- die erhabenen Teües J gi«" ^_{n Stück aus ein und} der an nebeneinanderliegenden Spulenwindungen in ^Obff „ Jt,'^ hergestellt ist, kann es gewünscheine unzweckmäßige Lage kommen, was ein ungleich- demselben Material^herges« _{ndsf ähi} _r. mäßiges Arbeiten des Rollos zur Folge haben kann. »₅ tenfalls versteift w™> ^₁'^^ι^εη Material-Die die Rillen bildenden vertieften Teile verlaufen machen, ^^^^ugsweise senkrecht orienentweder parallel zur Bodenebene des Rollos oder ha- bahn zur ^F.f ^εη^^η^1εΓRollos werden durch ben ein symmetrisch krummliniges, in der Bewegungs- üert seinι sollen, ui geeignete Weise richtung des Rollos sich verstärkendes Profil. Um an Fräsen, Formpressen oder aui ι β den Übergängen der vertieften Teile in die erhabenen 30 ^erh5^Ue"· · = _{ht auf d}i_e beschriebene und Teile das Auftreten unerwünschter mechanischer Be- Die brtindung *\ _f beschränkt, sondern anspruchungen zu verhindern, sind nach einem weite- dargestellte Ausfuhrung^orrn _{Erfindu abzu}. ren Erfindungsmerkmal die Übergangsstellen abge- ^°^^ Beispiel kann de,be seen, which in this case are opposite to ^d ™. ^Ov ^ _I g! S _FRUITS mechanical Beanspruüberliegen or offset from each other are. Are they tion, a dn ^u ™™. _"Recessed portions 4 are as staggered, one prevents verrunaern to the RII ao monitoring.. .. _ß. Strength, as well as len, that the recessed portions and the Fig. 2 shows raised parts, from gieicni s when winding the roller blind to form a coil, the raised parts are _{made of one piece and} which is made on adjacent coil windings in ^Ob ff "Jt," ^, it can gewünscheine inappropriate position come what an uneven same material ^ herges _{"NDSF AEHI} _r. moderate operation of the roller blind can result. » ₅ if necessary stiffened w ™> ^ ₁ '^^ ι ^ εη Material-Make the recessed parts forming the grooves run, ^^^^ either parallel to the floor plane of the roller blind or path ^{to the F} ^{.f εη} ^^ η ^ 1εΓRollos are by ben a symmetrically curvilinear, in the movement üert should be, ui suitable way direction of the roller blind reinforcing profile. In order to aui ι β transitions of the recessed portions in the raised 30 milling, molding or ^erh 5 ^Ue "· = _ht described _{in d} i _e and cuts the occurrence of unwanted mechanical loading The brtindung * \ _f limited but anspruchungen to prevent , after a broadly represented execution ^ orrn _inventions . Ren inventive feature the transition points shown- ^ ° ^^ Example

^SCwSere Einzelheiten der Erfindung ergeben sich 35 J^^ ^SC wSere details of the invention emerge 35 J ^^

aus der nachfolgenden Beschreibung der in der Zeich- ^^^St^Z^z. I. derart, daßfrom the following description of the in the drawing ^^^ St ^ Z ^ z. I. such that

nung dargestellten Ausfuhrungsform. Es zeigt 5 °rhSSim Tdle3 in der Mittel-Längsachse destion shown embodiment. It shows 5 ° rhSSim Tdle3 in the central longitudinal axis of the

SViT^ ** ^ ^ ^" RolÄ^sin !'an den Rändern des Rollo..SViT ^ ** ^ ^ ^ "RolÄ ^ sin! 'On the edges of the blind ..

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 only partially and are consequently in many cases with patent claims: afflicted with disadvantages. The properties of roller blinds made of rubber impregnated silk change too much when

1. Roller blind for camera shutters with very short temperature fluctuations that are normal for this material Exposure times, thereby marked 5 is exposed, and also such roller blinds net that it consists of a plastic film is not durable enough. Metal blinds, either made of and at least on one side of the film, rods that are folded in parallel with composite blinds or out consisting of corrugated sheet metal strips perpendicular to each other and perpendicular to the direction of movement (Swedish pades Roller blinds running grooves (2) reduced tentschrift 131 202) are permanent and against Tem material thickness having. io insensitive to temperature fluctuations. The bars or

2. Roller blind according to claim 1 with corrugations on both Fo- prevent the folding or creasing of the Lienseiten arranged grooves, thereby characterized roller blinds, because the roller blind against bending perpendicular to shows that each groove (2) is very resistant to its direction of movement on the one film. side a groove on the other side of the film, against- The resistance of the roller blind to bending overrides. 15 in the direction of movement is relatively low,

3. Roller blind according to claim 1 with on both fo- so that it is easy to roll and reel to Richlienseiten arranged grooves, as a result of which the change in identification runs away. The lifetime of the draws that the grooves (2) on the one foil roller blind is limited because it is due to fatigue side against the grooves on the other side of the film tends to break. Metal blinds also work are offset. 20 noisy and expensive to manufacture.

4. Roller blind according to claim 1 to 3, characterized in that it is also a roller blind closure for a photo-graphic, that the grooves (2) unevenly phical cameras on or to be used in this are separated from each other. Exchangeable cassettes known whose roller blind consists of a

5. Roller blind according to one of the preceding thin, preferably fabric-made carrier sayings, characterized in that the RiI- 25 is made with elastic transverse stiffeners. The transversal (2) forming recessed parts (4) between the stiffeners in the form of metal or plastic parallel to the ground plane extending raised strips are glued to the carrier or in the form of parts (3) are of uniform depth. vulcanized on by ribs (patent specification 10 836 des

6. Roller blind according to claim 5, characterized by the Office for Invention and Patents in East Berzeich, that the transitions (5) between the 30 lin). But the roller blind is not for a camera-recessed person Parts (4) and the raised parts (3) ended with very short exposure times, but for are beveled. interchangeable film magazines intended for which there

7. Roller blind according to one of the preceding changes to replace the sheet metal camera shutter and the film Proverbs, characterized in that the grooves protect when the magazine is removed. The blind should (2) have a symmetrical curvilinear profile, 35 resilient and relatively stiff so as not to that damage the strength of the recessed parts (4) in the movement, if you take off the direction of movement of the blind changes. interest accidentally pushes against the blind. The

8. Roller blind according to one of the preceding an. Roller blind should also be dimensionally stable so that it can only be used with Languages 1 to 7, characterized in that the one roll axis both in front of the image opening of the Maga plastic film a preferably black-colored interest can be pushed as well as withdrawn from it Polyester or another polymer or copoly- can. The well-known roller blind is therefore not part of the Kamemer or a different material with essentially a raverschußes, but only has a schütchen consistent physical properties. Such a blind would be for you ten is. Camera shutter for very short exposure times

45 from Viooo to V2000 seconds completely unsuitable as it 5 to 10 times even in the thinnest possible version

should be thicker than a roller blind according to the invention.

The previously known types of roller blinds have in common that it was not possible to

The invention relates to a roller blind for camera 50 sufficiently thin or from a sufficiently small one Finishes with very short exposure times. To produce mass without simultaneously producing the desired A good roller blind for a focal focal plane shutter has lasting and necessary properties Roller type in which the roller blind from a thin, pregnant. The main reason for the known Material is made, must be light-tight, durable and the disadvantages of roller blinds are that so far there is no Be resistant to wear and tear, and its 55 material gives it to a sufficient extent the properties it previously had should be within the appropriate and desirable proper temperature range mentioned when using the shops.

mera not change significantly. The invention has set itself the task of also being light, in order to achieve the acceleration of the roller blind for camera shutters with very short exposure times from zero to the exposure time used, in which the disadvantages of the possible. Because of the rapid acceleration that known roller blinds are exposed to when using a new one, it should also be made of slightly flexible, improved roller blind material and, thanks to a new texture, if it is practically eliminated via deflection rollers or the like for the structure,
change in progress. In addition, it should not be exposed to wrinkling that is uncontrollable according to the invention. 65 measured that the roller blind be made of a plastic film. Finally, the roller blind must be as noiseless as possible, move in parallel on at least one side of the film and be easy to manufacture. to each other and perpendicular to the direction of movement of the The known roller blinds meet these requirements.