DE7531374U - MULTIPLE CAMERA LENS - Google Patents

Description

Utility model registration; Multi-lens camera lens

The invention relates to a multi-lens camera lens, in particular a lens with a short focal length, with a split lens mount and at least two against each other axially displaceable lens subsystems, the sub mountings receiving the lens subsystems into one another are screwable.

In the case of such lenses, the one that carries a partial lens system is used for focusing by means of screwing Partial version in the other version the distance between the two partial lens systems changed to a small extent. For lenses with a very short focal length, such as those used in pocket cameras in particular, is often a change in the distance between the two lens subsystems of only a few tenths of a millimeter required. A prerequisite for such an exact setting is an almost completely backlash-free screw thread between the two

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tII «III

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Partial mounts of the lens. However, screw threads with such tight manufacturing tolerances are not only related to manufacturing quite difficult to manufacture and not only add significantly to the cost of a lens, but are also unsuitable for efficient production in series production.

The invention is therefore based on the object of creating an objective of the type mentioned at the beginning which, through simple measures, freedom from play between the partial mounts of the lens is achieved without having to adhere to tight manufacturing tolerances for the screw thread.

This object is achieved according to the present invention in that the partial mounts each have an annular shape Have stop surface between which an annular wave spring is arranged. By this measure the flanks of the two-sided thread turns are pressed against each other and d € .s a partial lens system can be moved axially against the other without play.

In a preferred embodiment of the invention, the one part mount carries a cup-shaped, one larger inside diameter than the outer diameter of the barrel having approach, in which the other partial socket can be screwed, wherein the wave spring

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7531374 1102.76

between the base of the cup-shaped approach and the is in the approach penetrating end face of the other partial version.

The wave spring is advantageously designed in such a way that that it has six contact surfaces offset from one another by 60 ° and that the successive ones Contact surfaces alternate on the stop surface of the both partial versions. As a result, the spring rests with three support points offset by 120 ° each part socket, so that an even distribution of the spring pressure along a thread is guaranteed.

An exemplary embodiment of the invention is shown in the drawing. Show it

Figure 1 shows a section through the camera lens,

Figure 2 shows the wave spring in plan view and

Figure 3 is a schematic representation of the

Side view of the wave spring according to the figure

The camera lens has two partial lens systems 1 and 2, each held in a partial version 3 and 4- are. The partial version 4- fc ~ * saws a pot-shaped Approach 4-a, the clear diameter of which is greater than that Outer diameter of the threaded part socket 4.

7531374 02/12/78

The cylindrical inner edges of this pot-shaped attachment 4a carry a thread 5, in which the partial mount 3 with a on the cylinder surface of the Partial mount arranged thread 6 can be screwed. Between the bottom of the pot-shaped approach 4a and the end face penetrating into the pot-shaped extension 3a of the partial mount 3 is an annular wave spring 7 arranged.

This wave spring is shown in Figure 2 in plan view. The hatched areas on the wave spring mark contact surfaces 7aι 7b of the spring offset from one another by 60 °, the successive Contact surfaces alternately on the end face 3a of the partial mount 3 and on the base of the cup-shaped extension 4a are present. As can be clearly seen in the schematic representation of the side view in Figure 3, is the spring with three support surfaces 7b, each offset by 120 °, on the end face 3a of the partial mount and with a further three support surfaces, each offset by 120 °. 7a at the base of the cup-shaped extension 4a of the partial mount, whereby an exact and even distribution of the Spring force is achieved along a thread.

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7531374 1Z.02.76

Claims (2)

1. Multi-lens camera lens, especially one with a short focal length Objective with split lens mount and at least two axially displaceable against each other Lens subsystems, the partial mounts receiving the lens subsystems in one another are screwable, characterized in that the partial mounts (3, 4) o'e have an annular stop surface between which an annular wave spring (7) is arranged. 2. Lens according to claim 1, characterized in that the one part mount (M-) has a cup-shaped, a larger inside diameter than the mount outer diameter having approach (4a), in which the other part mount (3) can be screwed, and that the wave spring (? "* lies between the base of the cup-shaped extension and the end face (3a) of the other partial version penetrating into the extension. -6- 7531374 02/12/76 IMI Mil 3 Objective according to Claim 1 or 2, characterized in that that the Wexlenfeder (7) has six support surfaces (7a, 7 "b) offset from one another by 60 ° and the successive contact surfaces alternately rest against the stop surface of the partial mounts (3 -, ^).