DD267337A1

DD267337A1 - VERSION FOR PROJECTION OBJECTIVES

Info

Publication number: DD267337A1
Application number: DD31130187A
Authority: DD
Inventors: Wolfgang Krause; Renate Hauschulz
Original assignee: Pentacon Feinoptisches Werk Go
Priority date: 1987-12-24
Filing date: 1987-12-24
Publication date: 1989-04-26

Abstract

Die Erfindung betrifft eine Fassung fuer Projektionsobjektive, vorzugsweise eine Plastfuellung fuer mindestens dreigliedrige Projektionssysteme. Die Linsenglieder und Abstandsringe sind von einer Seite her in einen Fassungskoerper einzubringen, der innen konisch ausgebildet ist und dort abgestufte Linsensitze fuer die Linsenglieder aufweist. Der Linsensitz mit dem kleinsten Durchmesser liegt innerhalb, der mit dem groessten Aussendurchmesser am aeussersten Rand des Fassungskoerpers. Die Aussendurchmesser der Linsenglieder sind vergroessert, um die entsprechende Stellung im Objektiv realisieren zu koennen. Der Fassungskoerper ist elastisch nachgiebig durch Nasen am Aussenumfang in einem Aussenkoerper klemmbar. Fig. 1The invention relates to a socket for projection lenses, preferably a Plastfuellung for at least tripartite projection systems. The lens members and spacer rings are to be introduced from one side into a socket body, which is conically internally formed and there has stepped lens seats for the lens members. The lens seat with the smallest diameter is inside, with the largest outside diameter at the very edge of the Fassungskoerpers. The outer diameter of the lens elements are enlarged in order to realize the corresponding position in the lens. The frame body is resiliently clamped by lugs on the outer circumference in an outer body. Fig. 1

Description

embodiment

Anhand eines Ausführungsbeispiels wird die Erfindung nachstehend näher erläutert. In der dazugehörigen Zeichnung zeigenReference to an embodiment of the invention will be explained in more detail below. In the accompanying drawing show

Fig. 1: einen Längsschnitt durch ein erfindungsgemäßes dreilinsiges Projektionsobjektiv und Fig. 2: einen Teilschnitt nach Linie A-A entsprechend Fig. I.1 shows a longitudinal section through a three-lens projection objective according to the invention, and FIG. 2 shows a partial section along the line A-A corresponding to FIG.

Entsprechend Fig. 1 sind die Linsenglieder 1,2 und 3 auf Linsensitzen im Fassungskörper 4 untergebracht. Der mittlere Linsensitz ist zur Vermeidung von Werkstoffanhäufungen als Rippe 4 a ausgebildet. Sie erscheint dreifach gleichmäßig im Innern des Fassungskörpers 4 umfangsseitig verteilt. Außerdem ist der Fassungskörper 4 mit drei ebenfalls gleichmäßig am hinteren Teil des Außenumfangs angeordneten, elastisch nachgiebigen Nasen 4 b (siehe Fig. 2) versehen. Die Anzahl der Rippen und Nasen kann aber auch größer gewählt werden.According to FIG. 1, the lens elements 1, 2 and 3 are accommodated on lens seats in the socket body 4. The middle lens seat is designed to prevent accumulation of material as a rib 4 a. It appears three times evenly distributed inside the socket body 4 circumferentially. In addition, the socket body 4 is provided with three also equally arranged on the rear part of the outer circumference, elastically yielding lugs 4 b (see Fig. 2). The number of ribs and noses can also be chosen larger.

Da das Innere des Fassungskörpers 4 von der einen äußeren Seite aus sich erfindungsgemäß konisch verengt und somit die Verwendung nur eines Werkzeug-Kernteiles erlaubt, sind die Linsensitze sch'agfehlerfrei und erscheinen stufenförmig angeordnet. Damit das den kleinsten optisch freien Durchmesser aufweisende Linsenglied 2 auch bestimmungsgemäß als Mittelglied eingesetzt werden kann, wird sein Außendurchmesser maßlich so weit vergrößert, daß er zwischen dem Durchmesser der beiden anderen Linsenglieder 1 und 3 liegt. Zum Einhalten der Luftabstä ide zwischen den Linsengliedern sind Abstandsringe 5 und β angeordnet.Since the interior of the socket body 4 conically narrows according to the invention from the one outer side and thus allows the use of only one tool core part, the lens seats are free of defects and appear arranged in steps. So that the smallest optically free diameter having lens member 2 can also be used as intended as an intermediate member, its outer diameter is dimensionally increased so far that it lies between the diameter of the other two lens elements 1 and 3. To comply with the Luftabstä ide between the lens members spacer rings 5 and β are arranged.

Der Fassungskörper 4 ist in einem Außenkörper 7 gelagert, der äußerlich unterschiedlich ausführbar ist und dessen Innenflüche eine Kegelfläche 7 b ist. Zur Scharfeinstellung trägt der Außenkörper 7 eine Drallnut 7 a. Insgesamt ist der Außenkörper mit seinen Außenmaßen auf den jeweiligen Projektortyp zugeschnitten. Die Montage des erfindungsgemäß ausgebildeten Projektionsobjektivs kann durch einen Industrieroboter erfolgen, wobei eine senkrechte Lage der optischen Achse Voraussetzung ist und die Frontlinse, d. h. das Linsenglied 1, nach erfolgter Montage nach oben zeigt.The socket body 4 is mounted in an outer body 7, which is externally different executable and the inner crevices is a conical surface 7 b. For focusing, the outer body 7 carries a swirl groove 7 a. Overall, the outer body is tailored with its external dimensions to the respective projector type. The assembly of the inventively embodied projection lens can be done by an industrial robot, with a vertical position of the optical axis is a prerequisite and the front lens, d. H. the lens member 1, after assembly is pointing upwards.

Die Arbeitsschritte sehen folgendermaßen aus:The steps are as follows:

1. Fügen der Teile 3,6,2,5 und 1 in der angegebenen Reihenfolge in den Fassungskörper 4.1. Add the parts 3,6,2,5 and 1 in the order given in the socket body. 4

2. Aufsetzen und Niederdrücken des Außenkörpers 7, bis er zur Anlage bei Linsonglied 1 kommt.2. placing and pressing the outer body 7 until it comes to rest on Linson member 1.

Dabei gibt der Fassungskörper 4 an seinen drei Nasen 4b infolge der Berührung mit der Kegelfläche 7 b elastisch nach und es kommt zu einem Haftsitz zwischen Fassungskörper 4 und Außenkörper 7.In this case, the socket body 4 at its three lugs 4b due to the contact with the conical surface 7 b elastically and it comes to a pressure fit between the socket body 4 and outer body. 7

3. Fügen des Schriftringes 8 mit Kleber oder als Snap-in-Verbindung.3. Add the writing ring 8 with glue or as a snap-in connection.

Damit liegt ein durch Industrieroboter schnell und sicher von nur einer Seite aus montiertes, dreigliedriges Projektionsobjektiv vor, das auch kaum einen Zentrierfehler aufweist.This is a fast and safe by industrial robots from only one side mounted, three-part projection lens, which also hardly has a centering error.

Claims

1. Version for projection lenses, which is designed as a plastic filling and the optical system is at least tripartite, wherein the center member has the smallest optically free diameter, characterized in that the center member in the outer diameter increases dimensionally, lying between the other lens members, is executed that the individual lens members associated lens seats are arranged stepwise within a common socket body so that the lens seat with the smallest diameter for the smallest lens member is located inside the socket body and for the largest lens member of the outer lens seat is provided with the largest diameter.

2. Socket for projection objects according to claim 1, characterized in that the socket body uniformly circumferentially distributed outside at one end has elastically yielding lugs and is mounted with these in an externally differently executable outer body.

3. Version for injection objectives according to claim 2, characterized in that at least one of the lens seats consists of several in the socket body uniformly circumferentially distributed ribs.

For this 1 page drawings

Field of application of the invention

The invention relates to a version for Projektio.isobjektive, which is designed as a plastic filling and whose optical system is at least three-membered, wherein the central member has the smallest optically free diameter.

Characteristic of the known state of the art

Frames for tripartite projection lenses are designed with the consideration of a simple and cost-saving installation in de: usually as a filling sockets. This means that the lenses are placed in a socket body and held by spaced between them spacer rings at the prescribed distance. Known solutions are designed so that the first and the third Linsengliod be performed in the socket body circumferentially & eUig, while the center member, which in the known projection systems generally has a smaller diameter, is mounted in one of the two spacer rings. Through a Vorschraub- or retaining ring, the entire lens is finally fixed. It has also been proposed to fix or glue the inserted lenses in the plastic holder body by crimping the plastic material under thermal or ultrasonic action. The introduction of the lenses is carried out in this case so that two lenses of different diameter of the one and the third lens is guided from the other side into the socket body. For this type of assembly, a use of robots is unsuitable.

Another disadvantage in the assembly of known plastic versions occurs due to the manufacturing technique used for the socket body. Due to the different Linsengiößen always at least one lens seat rieht formed by the same tool core part in the case of the plastic body produced in the plastic molding process. As a result, due to unavoidable axial displacements of the two tool parts impact errors of the lens seats to each other. They affect the optical performance and appear as a centering error * when checked.

Object of the invention

By applying the invention, the assembly of multi-unit projection lenses with plastic tool holders is made possible by means of industrial robots and an occurrence of the centering error is avoided.

Explanation of the essence of the invention

[.e invention has the object of providing a filling made of plastic material whose lens seats allow a largely slip-free recording of the lens members and at the same time an assembly of all lens elements from one side. The object is achieved in that the middle member dimensionally enlarged in the outer diameter, lying between the two other lens members is executed, that the individual lens members associated lens seats are arranged stepwise within a socket body so that the lens seat with the smallest diameter for the smallest lens member is located in the interior of the Tassungskörpers and is provided for the largest lens member of the outer lens seat with the largest diameter. An advantageous embodiment of the socket body further consists in that it has evenly distributed at one circumferential end elastically yielding lugs and stored with these in an externally differently executable »outer body is».

To avoid accumulation of material of the lens seat of the center member expediently consists of three in the socket body uniformly circumferentially distributed ribs.