DE426210C - Lighting device for photographic display chambers - Google Patents

Lighting device for photographic display chambers

Info

Publication number
DE426210C
DE426210C DEM84074D DEM0084074D DE426210C DE 426210 C DE426210 C DE 426210C DE M84074 D DEM84074 D DE M84074D DE M0084074 D DEM0084074 D DE M0084074D DE 426210 C DE426210 C DE 426210C
Authority
DE
Germany
Prior art keywords
lighting device
photographic display
incident light
illuminated
display chambers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEM84074D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEM84074D priority Critical patent/DE426210C/en
Application granted granted Critical
Publication of DE426210C publication Critical patent/DE426210C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/545—Lamp housings; Illuminating means for enlargers

Description

Beleuchtungsvorrichtung für photographische Wiedergabekammern. Zusatz zum Patent 409921. Die Erfindung betrifft eine Beleuchtungsvorrichtung für photographische Wiedergabekammern mit durchfallendem und auffallendem Licht nach Patent q.ö992i. Durch dieses Patent ist eine Beleuchtungsvorrichtung geschützt, welche das wiederzugebende Bild gleichzeitig von der Vorder- und von der Rückseite belichtet. Bei dieser Vorrichtung haben sich nun insofern Schwierigkeiten herausgestellt, als die Belichtungszeit des mit auffallendem Licht zu beleuchtenden Körpers nicht immer notwendigerweise dieselbe zu sein braucht. wie die des mit durchfallendem Licht zu beleuchtenden Teiles. Hieraus ergibt sich bei Verwendung zweier Stromkreise für die Lampen, daß die Lampen des einen Stromkreises nicht gleich lange eingeschaltet sein können wie die des anderen Stromkreises. Dadurch wird eine doppelte Schaltung erforderlich. Um diese zu vermeiden, ist nach der Erfindung in den Stromkreis zur Belichtung der mit auffallendem Licht zu beleuchtenden Teile ein regelbarer Widerstand eingeschaltet, so daß nach Ausgleich der Belichtungszeit für die im durchfallenden und auffallenden Licht zu beleuchtenden Teilc die Einschaltung der beiden Stromkreise durch einen für beide Stromkreise gemeinsamen Schalter gleichzeitig erfolgen kann.Lighting device for photographic display chambers. additive for patent 409921. The invention relates to a lighting device for photographic Reproduction chambers with transmitted and incident light according to patent q.ö992i. This patent protects a lighting device which is to be reproduced Image exposed from the front and the back at the same time. With this device have now found difficulties in that the exposure time of the body to be illuminated with incident light is not always necessary needs to be the same. like that of the one to be illuminated with transmitted light Part. If two circuits are used for the lamps, this means that the lamps of one circuit cannot be switched on for the same time as those of the other circuit. This means that a double circuit is required. In order to avoid this, according to the invention in the circuit for exposure of the A controllable resistor switched on with incident light to illuminate parts, so that after balancing the exposure time for the falling through and striking Light to be illuminated Teilc the switching on of the two circuits by one common switch for both circuits can take place at the same time.

Nachdem die beiden Stromkreise durch Einstecken ihrer Steckkontakte in eine entsprechende Dose miteinander vereinigt sind, wird der erwähnte Widerstand so eingestellt, daß die Belichtungszeit der von ihm beeinf3ußten Lampen für das auffallende Licht mit der Belichtungszeit für die mit durchfallendem Licht zu beleuchtenden Teile übereinstimmt. Diese Einstellung ist willkürlich und erfordert nur eine kleine Gewohnheit. Hierauf wird der Schalter geschlossen und nach Ablauf der für beide Beleuchtungsarten gemeinsamen Belichtungszeit wieder geöffnet. Auf diese Weise kann eine große Anzahl gleich belichteter Reproduktionen erzielt werden, wobei dennoch nur eine Hand beschäftigt ist.After the two circuits by inserting their plug contacts are combined with one another in a corresponding can, the aforementioned resistance adjusted so that the exposure time of the lamps influenced by it for the Striking light with the exposure time for those to be illuminated with transmitted light Parts match. This setting is arbitrary and only requires a small one Habit. Thereupon the switch is closed and after the expiry of the for both Types of lighting common exposure time reopened. That way you can a large number of equally exposed reproductions can be achieved, with nevertheless only one hand is busy.

Claims (1)

PA TENT-ANsPRUcH Beleuchtungsvorrichtung für photographische Wiedergabekammern mit durchfallendem und auffallendem Licht nach Patent q.0992 i, dadurch gekennzeichnet, daß in den Stromkreis zur Belichtung der mit auffallendem Licht zu beleuchtenden Teile ein Widerstand eingeschaltet ist, so daß nach Ausgleich der Belichtungszeit für die im durchfallenden und auffallenden Licht zu beleuchtenden Teile gleichzeitig die Einschaltung der beiden Stromkreise durch einen für beide Stromkreise gemeinsamen Schalter erfolgen kann.PA TENT CLAIM Lighting device for photographic display chambers with transmitted and incident light according to patent q.0992 i, characterized in that in the circuit for the exposure of the incident light to be illuminated Parts a resistor is turned on, so that after equalizing the exposure time for the parts to be illuminated in transmitted and incident light at the same time the activation of the two circuits by a common for both circuits Switch can be made.
DEM84074D 1924-03-02 1924-03-02 Lighting device for photographic display chambers Expired DE426210C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM84074D DE426210C (en) 1924-03-02 1924-03-02 Lighting device for photographic display chambers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM84074D DE426210C (en) 1924-03-02 1924-03-02 Lighting device for photographic display chambers

Publications (1)

Publication Number Publication Date
DE426210C true DE426210C (en) 1926-03-06

Family

ID=7319808

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM84074D Expired DE426210C (en) 1924-03-02 1924-03-02 Lighting device for photographic display chambers

Country Status (1)

Country Link
DE (1) DE426210C (en)

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