AT52192B

AT52192B - Telescope with positive eyepiece and with a ballast lens system that corresponds to a Dutch telescope.

Info

Publication number: AT52192B
Authority: AT
Original assignee: Zeiss Carl Fa
Priority date: 1910-04-21
Filing date: 1911-04-03
Publication date: 1912-02-10

Description

  

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   In Fig. 3 und 4 ist noch ein Ausführungsbeispiel der Erfindung dargestellt, das dem Schema Fig. 1 entspricht. Das einfache Fernrohr ist gebrochen gedacht. Sein vorderes Spiegelprisma d liegt vor dem   Objektiv o, ungefähr   an der Stelle, wo sich die vorgeschobene Eintrittspupille befindet. Die Glieder   b und c des Vorschaltsystems   sitzen in einer gemeinsamen Fassung   e,   die auf dem   Prismengeh use     derart drehbar   gemacht ist, dass die Drehachse senkrecht auf der Ebene des gebrochenen Fernrohres steht. Um die Vorschaltung auszuführen, dreht man die Fassung e mit dem   Vorachaltsystem   beaus der in vollen Linien gezeichneten Lage, in der das System unwirksam ist, um 1800.

   Dadurch kommt das System in die in Fig. 3 durch Punktierung angedeutete Lage, in der das sammelnde Glied b vor und das zerstreuende c hinter dem Prisma d liegt. Ersetzt man das Prisma d durch ein solches, das mittels einer zweiten, zur ersten parallelen Spiegelfläche auch auf der Rückseite spiegelnd wirkt, so kann man dieses Doppelspiegelprisma mit den Gliedern b und c fest verbinden und an   dpren Drehung um 180"teilnehmen   lassen. Es wird dann in der wirksamen Stellung des Vorschaltsystems die eine und in der unwirksamen die andere Spiegelfläche des Doppelprismas benutzt.



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   In Fig. 3 and 4 another embodiment of the invention is shown, which corresponds to the diagram of FIG. The simple telescope is intended to be broken. Its front mirror prism d lies in front of the objective o, approximately at the point where the advanced entrance pupil is. The members b and c of the ballast system sit in a common socket e, which is made rotatable on the prism housing in such a way that the axis of rotation is perpendicular to the plane of the broken telescope. To carry out the upstream connection, one rotates the socket e with the upstream system from the position shown in full lines in which the system is ineffective, around 1800.

   As a result, the system comes into the position indicated by dots in FIG. 3, in which the collecting member b is in front of the prism d and the dispersing member c is behind. If the prism d is replaced by one that also has a reflective effect on the rear side by means of a second mirror surface parallel to the first, this double mirror prism can be firmly connected to members b and c and allowed to take part in the 180 "rotation then one mirror surface of the double prism is used in the active position of the ballast system and the other in the inactive position.

Claims

PATENT CLAIMS: 1. Telescope with positive eyepiece and with a ballast lens system. which corresponds to a Dutch telescope, characterized in that the entrance pupil of the telescope is advanced so far that, when the lens system is connected, the crossing of the tufts takes place between the two lenses of this system, 2. Broken telescope according to claim 1, in which the front mirror prism is in front of the lens and the two members of the ballast system are in their effective position in front of and behind the prism, characterized in that these members are made upstream in that they are fixed connected and rotatable about an axis perpendicular to the plane of the broken telescope.