DE1683007U - EXPOSURE METER WITH PRESENT FILTER. - Google Patents

Description

Hex: Messinstrumentebau: GrmbH *. »- Erlangeny February 1st 1954.

S 8228 / 4-211 Gm.

Light meter with a counter that can be presented

In more recent exposure meters, is usually τοττ in the Shotazelle used for the measurement ¹ of the light, an optical element _r provided that has the task of -. The light incident from the object to and seiner- ambient light as uniformly as possible ztt distribute across the photocell .. This optical element is composed of a * ground glass or frosted glass vein is also formed as a Tflelfach-Irinsenanordnung in verschiedenster sort on the Phatazelle comprise overlapping images results in _r the more or less out of focus of the cell axtf appear "or else it is simply a in A wide variety of types of perforated covers are connected in front of them, which, as a multi-layer screen similar to a Yie-lfaeh-hole camera with a large aperture, force a diffuse exposure of the cell. Bad effect on the photo cell - a diffuse coating _{for the} dMt mean value of the light within the entire angle of incidence of the light on the optical element

In a number of cases, however, it is not expedient bulky, such -a mean _value: measurement of the light to

nft-JC? ^: . '". ■' ■ '' ■ -. ■ -. \ Ζ

Hear Messinstrumentebau GmbH ·, Erlangen ,, den. 1st February ί954 ··>

S 8228 / 42h. gnu

use it very often - and especially when taking pictures outdoors. - a: the greater part of the sky radiation: it is also measured, which determines the largest part of the amount of light when the sky is cloudy, and the opposite the amount of light of the amount of light to be absorbed. The object only represents a small - often very small - amount ». The mean value achieved by the diffuse division of the total incident light is significantly greater than the cLex mean value *, which is the basis for correct exposure and is derived from the. Lighting conditions alone, the object to be recorded results ». The exposure and aperture values to be determined on the basis of these mean values therefore generally correspond to a mean value that is too high, so that the light distribution of the object to be recorded. when ehotographing 'not correct, can * · be recorded »

Jim to remedy these shortcomings * is inventively superiors soitlagea "before dia MchteintrlttsSflfhuiig; a, to present Mlter * that with his ^ e ^ Erager ^ SEit. ^ emin * the barking measurement ^; er eini ^ a ^ leniett ^ StrabiEenoundeX ~ 'a & blewegt · ^ that the opening width of the incident liightgrtoahlenMind'als b: egrensfe are kana. » This limitation is achieved by * that the filter carrier is pivoted about an axis parallel to the reading or display plane of the exposure meter and, in certain positions, the opening width of the incident gauge

Rex: Messinstromeirfrebau: GmbH * _r den. t-5 ^: * 2etamaar 1954.

bundle of rays »depending on the present IaIX zrareek ,! = is fixed; or stated: can be ..

Since ill the- sail of the light meter- a different than; Eiciiteintrittsöffniing has _r , in general this iiciiteiiittsöffniing is rectangular? "and is arranged in such a way that the broad side of the rectangle is in the horizontal position. Opening width of the incident, gap distance τοη. above ner limited, so it Dji · _f is the directly einfallen- the Himmelslicltii -. aucit vein Sonnenlicnt - abgescnirmt ·, 33er on the ropes striking * Mean value nanert SICIL so that the mean value * which aufabnehmenden of dear. Object to be determined

instruments

üne already proposed limitation of the distance thereby. ,, that at normal ableaehaltiing; des insiiwenlcbaren- -and taar to the ibleseebener mustardech * - stored Acfesezt - ~ |

dreiibarer flaps are vorgesenen * erfSll-fe ni © £ Lt · äisss - "" AuEf- 'would * da lediglicn a Einengung- of (xesicntafeldes ER''''■■

Sufficient is the inten— j, which falls mainly from above

sive light is not dimmed · <

- I.

■■: .. ■ '■ .'- .. ■. "-4-

Hex Messinstrumentebau GmbH », Gain,. the 15th »3rd February 1954 *

"E 8228/4211

The invention according to arrangement of the pivot axis of the filter carrier is so then the vorteilhaftesten, if the pivot axis is parallel to the longitudinal axis of the light entrance opening ,: because ier meter 30 is in. The Hegel held or ^ arranged on the camera that in normal shooting position of the camera, the longitudinal axis the exposure meter falls horizontally

It is often useful and. desired _r . that the PiI-terwert can be changed * in order to do justice to the amount of light lying around the door * It is; Therefore proposed according to the invention * not to firmly connect the filter to the bracket, but to attach the filter in or on the bracket in a way that allows _{P to} replace the filter inserted in the bracket with another one if necessary.

It is always necessary; aein,> the full light entry opening for the unique bundle of light rays »! to release ^ also ^ d ^ niE ^ nichtrfe ^ wfQiE.iaa Itlter completely: before disr Mchtelntriittaäffnia ^ gr gel &% w € r # * Ia äteams. Everything is according to the invention: expedient <^ ized: oil-yields from a light-impervious; Bfaterial hetrzaaü & lJLen. *. that completely or partially covers the filter surface - The surface lying support surface made of translucent

-5-

Hex Messinstrumentebau SmbE ** / Erlangen _r den. 13 «February 1954 ^ L

- H 8228 / 42h Sm. /

Material provided with perforations », which in / any Shape and arrangement can be provided

Another ¹ proposal according to the invention * for the same purpose 2ϊο. Achieve, then * that-one with a filter-carrier- with a filter holder,: which practically the full filter area? releases »next to the filter * pushes a cover into the slide mount, which has the desired openings»

asn. In the case of the production of standardized filter flaps for a certain type of exposure meter, it is suggested that the filter and aperture should not be manufactured as separate components * but rather that they should be combined into one component Filters opaque, whose [

Shape and arrangement Depending on requirements, "can be selected". So ·. you can s.B * with the help of a template on the given « Filter a «Hchtundrerehlassigs metallization or- vaporize

Etch away the filter surface ^ odejr but that? Filter = from several Establish filter layers * between which the. from li.eh.tun-— cover made of permeable material is cemented in » This combined filter screen can also be obtained this way * that in one to be inserted into the socket of the filter clapper

Hex Messinstrumentebau GmbH * Erlangen-, February 1st, 1954-.

. R 8223 / 421L

Cover the opening with the. Filter material is filled.

lit each of these mentioned. Cases you get an interchangeable one Component ,, which is filter and aperture at the same time ,, and that as required or gate script in; the filter flap can be inserted

Ss is essential and is within the scope of the present invention, herausteliejt the filter carrier consists of a TJ-shaped material or material so as to deform »^ that ¹ it receives a ΐΓ-shaped cross section from a flat · The see- kelweite is a little grosser- chosen as the longitudinal axis of the filter is »aodasa dle> the legs of the filter support have a greater distance from one another than the length of the inlet opening has * The; According to the proposal, legs are to be selected so that they are wide ^ that their width is greater than the Querile & tttng of the calibration entry opening · This leg runs through; the pivot axis ¹ äe & entire. Carrier "in order to allow through appropriate üagerkonatruktionen OCE ^ filter exchanger'wr-" the ^ SiehtelntrittsöffBung; 8chwenkbar before-is a necessary ^ · THe linr € ch.tungeit and ^ it göstattea "au components to filtarträger in Generic Eag®; secure, - are known and do not need to be discussed in detail. They can be used as resilient bearing elements -

-T-

Rear measuring instruments. Gmblf ». _r Jf

■ —7— Erlangen ,, den, tJ-Fftferttar- 1954 'S 8228/4211 Gn

-y hooks or- sliding couplings. tua.uu - to be trained. " This goal stroke: the legs at least as wide au. Making how the transverse direction of the Eichteintritts- 'opening is * has another purpose, which is achieved by the door-lying construction - change »in the marriage entry opening; of the exposure meter za, gelettf, whereby stray light _r that for the ztc measuring calibration values? of the object is not determinative, can be screened _r and to a greater or lesser extent * according to the position of the egg carrier on the pivot axis ·

The attached drawings show in aen 5ig * T-6 the subject matter of the invention in an exemplary embodiment *

xatäi 2 show ^ len. Light meter with ά τ & terklappe in Torder- or · side view ", and indeed is shown in · the · lig>" 2 commanding JiXterklappe? Average * Tor the

% is the filter carrier 2 "rorgsschweiiiEir · ' ~~~ \

denotes the freelance?

the incident: light that passes through the filter 4 to, op.tischea elements 5 which cast the incident view onto the photocell behind it. The IT-shaped legs S of the filter support encompass the axis of rotation 7 ₁

. ■; ■■■. ■ '■ -. ■ ■ -. ■ ...-Β-.

Hex Me3sinstrumentebau GmbH. * Erlangen _r the T3v £ ebruary 1954 *

R 8228 / 4-211. Sm. ^

according to the representations, in Fig. 1 and 2 parallel to the reading or Anseigeehene S and to the longitudinal axis of the Liehtein—.

case opening loads., /

^ In. You can see flg. 3. at 9 the in. the release of the fiI-. flap next to the. Filter 4- inserted aperture »the in. The-. This Figure ^1, for example, has diamond-shaped openings. In. flg «4 is the filter carrier Z tn, one for. Partly swiveled-in legend - here - border position - shown and you can see * how the entire bundle of light rays incident when the egg-bottom flap is completely swiveled away with the filter flap partially swiveled in: the incident from the object to be recorded. Light rays is constrained, while the non rom object incident rays; tt - the predominantly, from. come up * from the lobster! *. - through the partially delimiting filter flap from the light-scattering ones. Shielded elements are · / Since this is not bäelrfe of ^Q coming light beam bundle also from Since "her ixt the optical scattering elements 5 incident ^ wena di # filtrerklappe? swiveled away * this is how one recognizes the practicality of the tt-shaped seat position of the filter flap »since the leg S shields this incident light ·

'In Jig · 5 of the Pilterträger 2 is shown, which consists of the same material as the filter. The ribs designated with 12 on this filter support 2 (see also Fig. 6)

Sex Eeasinstrumeatebau GmbH-, Erlangen * February 15, 1954

R 8228 / 42k Gnu

should, the aperture range aadeiLteii "dt" in the above aeireii kind of erzengir been slxtd, icteir about dxircli on kitten an aperture tj ^ the sieve »if necessary, too. still, about that Knuckle 6 of the U-shaped embossing 2 extend * ^

Claims (1)

Rex Messinstrumentebau GmbH., J ^^ Erlangen ,, February 13, 1954. rf S c h u t ζ a η s ρ r ü c h e :: * Light meter with a filter that can be placed in front of it », marked»; that what is to be presented in front of the light inlet opening; Filter with its carrier to the one in the. Light meter incident light beam through. Rotation of the The carrier around a plane parallel to the reading or display plane Axis can be pivoted so that the opening width of the bundle of light rays in the plane perpendicular to the axis of rotation dea Erägera is variably adjustable «, Z *. Exposure meter according to claim T * characterized in that ». that the longitudinal axis of the light incidence opening is arranged parallel to the pivot axis of the filter carrier » 3, filter support for light meter according to claim T and / cder 2 _r, characterized in that the filter is fastened in or on the in a mount in an exchangeable manner. 4 »Filter carrier for light meter according to claim. 3 * characterized in that it consists of a light-proof material Sen "that the filter area or completely covering • partially · 5. Filter carrier for light meter according to claim 3 or 4 » characterized in that the socket is dimensioned in such a way that -A2- Sex Messinstrxunentebam GmbH- », y / / ' . Eriangeii. ^ Dan T3 ^ February '1954 * ·· ' ■ * \> -Δ2- ■: - ■■■. ■■ -H 822S / 42h. Sm * that iieiseiL the filter "nocii a © aperture mil; Blenaen & ff nan— any IPornt could be inserted 6 * filter 2KHt Slitseirzenv in the 'filter carrier' according to claims 3-5 ₁ dadurcli marked »that cover and silfcer are combined in one · component * T «Silterträger- for Beliclrttmgsmesser after. Ansgrueit 3-6 of H-f Snnigem lfaterial _r whose legs with Aehslagerungen. of the * Scienfcacnse Tersen are: * 8 * filter carrier tixxr Belicntungsntesser according to claim. 1-7 ». marked by the fact that the filter and filter holder are made of the same material - possibly as one component *