DE1422684A1 - Image recording device with a diaphragm coupled to or controlled by a photoelectric cell - Google Patents

Description

Tiranty, Paris, France

P a fc ent to message

Bildaufnahraeappärat with a photoelectric line -. coupled tfder from this controlled shutter

The invention relates to image recording apparatus (photogrephic, cinematographic apparatus, etc.), the blends of which with a light-sensitive element or a phato-cell of each individual case adapted type (with front or
rear barrier layer made of silicon, selenium, germanium ^,
or light-insensitive Br layer) coupled or by one

·. ' ■ ■. ' I ■ ·. '■■' ■■■■ - ■

Cell controlled iat "

In the case of the known devices, the photocell or the
light-sensitive element (regardless of whether with the aperture
often coupled or whether it controls it directly or indirectly, for example by means of a galvanometer or a small transistor amplifier that feeds a fflotor) generally "- nan located outside the hole of the light rays falling on the taking lens. In most cases this light-sensitive element is or element inserted in a recess adjoining the V objective and has its own X optics from the same axis uiio that of the objective, Xn

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other cases, the photosensitive, element is all around arranged dad lens that surrounds it like a wreath, Ea is also thought of murder »the photosensitive Clement to be attached to the front surface of the clasp.

Neither of these arrangements is entirely satisfactory, if the photosensitive element is arranged outside the path which the light rays falling on the object! The light impinging on the element is poorly defined, and because of the directional effect of the optics assigned to the light-sensitive element, the light-sensitive element runs out; ! r ^ surrounds the lens, then the above disadvantage of inert ^ .v remains. When the light-sensitive element was to be attached to the cover, the delicate and practically poorly solved problem of electrical connections was encountered. for very weak currents between fixed points ^and: ΐ: points a movable Feiles (closure), the 'A ^ :. high Geschuiindlgkaitan and is exposed to strong UJinkel accelerations, were to produce. :

The invention makes it possible to overcome the disadvantages set out above to avoid, and it also offers various advantages, such as will still be seen. The invention is noted by that the photosensitive element or surface (photoelectric Line), which is coupled with a diaphragm (or controls this), at least partiaaiaa on mirdsstans Part of the front surface d »s odsr dar Bsstardteiks (leaves)

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the actual aperture before-gesshan is in order to uon a part the only rays of light that enter the taking lens fall to be acted upon.

So one of the advantages of this arrangement is that that. dae photosensitive element directly and merely is influenced by a tail dee of light passing through the lens. The use of lenses with different focal lengths (normal lens, wide-angle lens, telephoto lens, lens with variable focal length, etc.), Anamorphis blushing uljui * can therefore be considered who » the.

The invention allows various execution iron, the are identified by the following FBerkmaie »

In that case, the diaphragm has a solid sheet with it middle opening (or a wreath of holes with vsr ~, different diameters) and possibly ain behind this If there is a fixed blade on a movable blade, the light measuring element or surface is on a tail at least the front side of the fixed blade, expediently the middle hole arranged on this sheet.

In the case where the aperture is a solid sheet and a has a movable sheet with respect to this, the photosensitive elements or surfaces are on at least one part the front of the fixed sheet and (or) arranged on at least part of the front of the movable Ulattes.

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In the peel ₉ in which the movable sheet is adjusted behind the fixed sheet with the central hole, the photosensitive element or area surrounds the movable sheet, the opening of the movable sheet and is delimited at the edges in such a way that the entire photosensitive surface is clearly defined The law of the diaphragm varies depending on the aperture

In the fur "in which the panel 2 (or a greater number) of moving blades having presets" the "I · - - <* other (or in succession) adjust" let the light-sensitive element or surface on the front of the front Biettee _f And optionally on the front of the rear; (or the 'back) sheet provided

In the skin in which the diaphragm has several bloods, controlled by one or more galvanometers possesses the front leaf (regardless of whether it is feet or movable) except for its opening for the passage of the Rays of light that expose the flat surface of the photograph should, one or more openings lying outside the passage zone of the aforementioned light beams .what a fraction of the light falls on the light-sensitive element or surface that is on the front side, the sheet lying immediately behind the front sheet

In the case where the photosensitive element or Area on one (or more) movable leaf of the diaphragm

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provided and this (or each) movable sheet of the controlled galvanometer associated with said Clement let, the (or each) electrical connection is made dee light-sensitive element or surface through the spiral or spirals of the galvanometer.

Another type of design is light-sensitive Area on the front of a "falechen screen", i.e. on the front side of a sheet is provided with an opening drilled to the maximum useful opening of the objective, where this sheet immediately before the actual aperture: optionally between the optical members, the receiving lens is arranged.

In all cases this can be arranged in the above manner light-sensitive element or surface in a known manner suitable correction means (e.g. one with the winding of the Galvanometers lying in series üheoetat ^ n etc.) for the purpose of regulating the aperture as a function of the sensitivity of the? be assigned to photographic film

Case a plurality of photosensitive elements are present, ■ ';:. ■■ can either dee in Parajrlelechluß or ReihenschluS ■ on the galvanometer for the control or the leaves of the diaphragm to be connected. _;

Further details and features of the invention are correct from the following description of some exemplary embodiments illustrated schematically in the drawing, and ziaar show: ι

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cameras in which the invention is applied,

Fig. 2 is a diagram of the relative positions of the members, of the recording lens, the aperture, of the aperture controlling galvanometer, the photosensitive element carried by the leaves of the diaphragm, the conclusion and the film,

Fig. 3 is a front view of another type of embodiment those with photosensitive elements: Cover,

Fig. 4 is a diagrammatic representation relating to a Another embodiment of a screen with several light-sensitive elements relates to

In the example of FIG. 1, the diaphragm has a solid sheet with a 2 middle opening and a movable blade. 3, which swings around the axis 4 and has a cutout 5 which, together with the aforementioned central opening 2, delimits the useful opening of the taking lens, which does not The links shown in front of and behind the panel are intended.

According to the invention, the front of the solid sheet 1 carries a photosensitive element or surface 6, which over »ine Connection 7 to the galvanometer (not shown) is closed, the movable part of which directly controls the movable blade 3 · The upper side of the movable Sheet 3 in turn carries a photosensitive element or area 8, dia to the admonished galvanometer by the Spirometer 9 of the galvanometer is connected.

In this version, the light-sensitive surface grows, • exposed to rays of light falling on the lens

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let, «it the light intensity, i.e. * lt the closure of the miserable. Around a light-sensitive surface of unchangeable dimensions to have »would be enough to only have them on the firm sheet 1 to be provided *

In Fig. 2, the fixed diaphragm leaf 1 can be seen again,

is carried by the lever 1a. This sheet comes with a middle opening 2 and a photosensitive clement or

View area 6. On the other hand, there is also the movable leaf

present »daa with a light-sensitive clement or

Surface β provided let. Ia present skins, however, has daa "

movable sheet an opening 10 (instead of the cutout

S after the first type of execution) and the light-sensitive: Clement or curses 8 is arranged around this opening 10.

The light-sensitive elements or surfaces 6 and β are connected to the galvanometer via the conductor 7 or via the spiral 9, respectively 11 connected »

In front of and behind the blends 1-3 are the front optical Member 12 or that rear optical member 13 of the taking lens is arranged, behind which the shutter 14 and the Film 15 are arranged. Of course, the invention can also be used in the case in which the members of the taking lens completely overlap the leaves of the diaphragm are downstream.

The execution according to Fig. 3 (in which the same reference numerals as in Fig. 1 are used) differs from i / ori rtusführungearfc of Fig. 1 only in that the light

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sensitive clement or surface ba of the movable blade 3 the diaphragm has such an outline, deO the entirety the light-sensitive surface exposed to the light remains constant or, on the contrary, fluctuates with a certain regularity depending on the opening of the diaphragm.

In the embodiment according to FIG. 4, in which the same reference numbers are used to designate the same organs mis in FIG carry light-sensitive elements or surfaces 20 and 21 on their front side, which surrounded the openings 22 and 23 of the sectors mentioned »

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Claims (7)

Claims 1. ■ Image recording device with a diaphragm control, which is used for measurement at least one part of the object brightness is a photocell has, d ad characterized by that at least part of the light-sensitive element (8) of the Photocell is arranged on at least one or a significant component or sheet (3) of the diaphragm (1,3) and that the moving part (9) of the galvanometer of the photocell the moving part or sheet (3) of the diaphragm (1,3) 'f. _t ■ carries or is connected to it, the panel (1,3) fully automatically controllable and the current of the photocell. "on the one hand as a function of the object brightness and on the other hand as a direct function of the degree of closure of the aperture (2) flows « 2. Bildauf nahfngerät according to claim 1, characterized by ge «» indicates that in the case where the diaphragm comprises a fixed sheet and a sheet movable with respect to it, the photosensitive elements or surfaces on at least a part of the front side of the fixed sheet and (or) on at least part of the front of the moving { borrowed sheet are arranged 3. Image recording apparatus according to claim 1, characterized in that in the case in which the movable sheet moves behind the fixed sheet with central opening, the photosensitive element or surface of the movable sheet surrounds the opening of this movable sheet and so limited at its edges is that the whole, is acted on by light, lichtompfind.liche surface with certain regularity depending van aperture of the diaphragm ': is changeable _o BAD ORIGINAL 9 09817/0090 40, 4. Bildaufnahmeapqarat according to claim 1, characterized net, that in the case, in some cases the diaphragm zuisi (or ' one larger number) more mobile smoothness; which adjust in front of one another (or one behind the other), the light- sensitive element pd '■ front sheet and possibly on the UorüBrauiub of the rear sheet or sheets is provided. 5. Image recording apparatus according to claim 1, characterized in that in the case in which the diaphragm aufmeist several sheets, the one or more galvanometers .. ^ controlled uie.rdBri, the front sheet (regardless of whether it is fixed or movable) except for its opening for the passage of the light rays that occupy the photographic surface? are clear, have one or more outside the Average _'':. gängszone the aforementioned light beams lying openings that can fall through uielcheein fraction of the light to the photosensitive Clement or surface, the one or on the front of the immediately behind the front. "Journal lying leaf. 6. Image recording apparatus according to claim 1, characterized in that in the case in which the photosensitive Element or surface on ainöri '(or several) movable Sheet of the diaphragm provided and this' (or each) movable sheet of the said element associated with GaI- 909817/00 90 BATH variometer is controlled, the electrical connection of the photosensitive elements or surface through the spiral or spirals of the galvanometer itself takes place. 7. Image recording apparatus according to claim 1, characterized in that in the case in which a plurality of light-sensitive elements are present, these with the galvanometer are connected either in parallel or in series for the control of the diaphragm leaf (s). f ATENTANW4LT Dlpl-Ing Kfta 909817/0 090 BATH ORIGINAL