Axially displaceable aligning mount for optical components,...

Details Axially displaceable aligning mount for optical components,... Axially displaceable aligning mount for optical components,...

2003-03-06

2004-07-06

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With support

C359S819000

Reexamination Certificate

active

06760166

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority to German patent application 102 09 938.3, which is hereby incorporated by reference herein.
BACKGROUND
The application concerns an axially displaceable aligning mount for optical components, in particular for lens elements or lens combinations of zoom systems, and a method for its manufacture.
BACKGROUND OF THE INVENTION
In optical zoom systems, individual lens members or cemented lens combinations are arranged axially displaceably so that parfocality over the entire zoom range can be set and retained. Whenever possible, no tilting of the lens elements or of their mounts should occur during translations of this kind, since decentering can result therefrom and cause a degradation of the image quality of the overall optical system.
A known aligning mount
11
is depicted in FIG.
1
. It has a passthrough transport thread
12
that corresponds to a corresponding internal thread of a mount receptacle
10
. A cemented lens member L and a further individual lens element are retained in aligning mount
11
in known fashion. With exact positioning, the optical axes of lens elements L coincide with the optical axis of the overall system. A disadvantage of this aligning mount
11
is that because of the thread clearance that is present, the risk of a large tilt of this aligning mount exists, resulting in the aforementioned degradations of image quality.
A further known aligning mount has a transport thread having one guidance diameter at the mount receptacle and at the actual aligning mount. It is disadvantageous here that the transport thread shortens the guidance length, which is labeled F in each of the Figures. In addition, the external mount receptacle also requires an internal thread, which greatly increases manufacturing costs.
In a further known aligning mount, one transport thread as well as two different guidance diameters, at the mount receptacle and the actual aligning mount, are provided. It is disadvantageous that the guidance diameters must be manufactured in separate operations, and that adaptation of the guidance diameters of the mount receptacle and aligning mount is possible only with great effort.
Another known aligning mount is shown in FIG.
2
. Over the entire guidance length F, two identical guidance diameters and one transport thread
12
a
are provided in the center region between the guidance diameters at aligning mount
11
a
, as well as a passthrough guidance diameter, without a thread, at mount receptacle
10
a.
Through a lateral orifice
13
with an internal thread in mount receptacle
10
a
, which for that reason must have a large wall thickness Wa, a resilient ball
15
is pressed into the thread and held by a retaining screw
14
. Ball
15
engages partially into transport thread
12
a
and effects an axial motion upon rotation of aligning mount
11
a
. In this known mount, it is disadvantageous that a large wall thickness Wa of mount receptacle
10
a
is needed in order to receive resilient ball
15
and retaining screw
14
. In addition, ball
15
exerts a force on mount
11
a
that can result in a deformation of the aligning mount and in a consequent distortion of the lens elements.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide an axially displaceable aligning mount that does not exhibit the aforesaid disadvantages and that allows low-tilt axial translations to be performed. A further object is to provide a method for manufacturing an accurately centered and accurately aligned axially displaceable aligning mount.
The present invention provide an axially displaceable aligning mount for optical components, in particular for lens elements and/or lens combinations of zoom systems. The aligning mount according to the present invention includes a) a mount receptacle having a cylindrical orifice, the mount receptacle having at least one transverse opening in its center region; b) an aligning mount, receiving the lens elements or lens combinations, that has a cylindrical guidance diameter in its two end regions and a transport thread in its center region. The cylindrical guidance diameter (D) of the mount receptacle (
20
) is embodied in internally unthreaded fashion. The diameter of the transport thread (
22
) is no greater than the guidance diameter (D). Moreover, the transverse opening (
23
) has, in its region facing toward the transport thread (
22
) and in the associated thread region, a one-piece threaded segment (
24
).
Advantages of the arrangement and method according to the present invention include the fact that an arrangement that economizes on material and reduces costs is obtained, in which tilting during the translation operation is drastically reduced or minimized as compared to known approaches. The mount receptacle can be of simpler configuration, in particular even if only thin wall thicknesses can be allowed or are dictated by the design.


REFERENCES:
patent: 2894430 (1959-07-01), Schuch
patent: 5521764 (1996-05-01), Balogh et al.
patent: 6590720 (2003-07-01), Oba

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