An assembly includes a male member fitted in the bore of a female member in a rigid or slidable manner, with at least one of the confronting peripheral surfaces of both members being formed with a plurality of equally spaced projections which are positioned between the two members. These projections are of such a shape as to afford a low mechanical strength, such as for instance, triangular or trapezoidal in cross section, and contribute to eliminating any looseness in the fit between the assembled members. The projections may be cut or collapsed or otherwise altered under pressure by a face of the opposite member in which the projection carrying member is fitted during assembly thereby eliminating any clearance between the members with the resulting obviation of looseness.
A laser diode module as an example has a laser diode pressed into a first housing part and a lens of an optical collimation system pressed into a cup-shaped second housing part. The second housing part is pressed into a cylindrical opening of the first housing part. In the opening there are molded three runners, which extend in the axial direction and are uniformly distributed in the peripheral direction, with the runners engaging on the jacket surface of the second housing part. The runners and the jacket surface form connection elements which are press-fitted together and which enable, apart from the connection, an adjustment of the lens relative to the laser diode. Pressure die cast zinc is in particular suitable as the material for the connection elements. An adhesive bond is not required with a holder of this kind.
A lens frame consists of a lens barrel with a built-in projection lens and a support member in which the lens barrel is inserted and supported. The lens barrel has on its outer surface a pair of axially spaced projections as a slide member. The support member has on its inner surface projected guide strips that extend inclined with respect to a plane perpendicular to the axis of the support member. The support member also has axially extending ribs on the inner surface that tightly engage with the outer surface of the lens barrel as the latter is inserted into the former, in order to keep their axes aligned. With the lens barrel inserted and the projected guide strip received between the paired projections, the lens barrel is rotated and the paired projections are guided along the inclined projected guide strip, causing the lens barrel to move forward or backward in the axial direction. In this way, the focus adjustment can easily be made. The tight engagement between the ribs and the lens barrel produces contact friction that helps prevent the lens barrel from being turned inadvertently after the focus adjustment is made.
A rotary securing lens and mount assemblage has a lens and a mount for the lens which are secured to one another when the lens is rotated relative to the mount. The lens includes at least one cutting edge which is shaped to cut into the mount in order for the lens and the mount to become mutually engaged to be secured to one another when the lens is rotated.
