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1. A focus adjustment apparatus (10) of an optical code reader (100) which has an objective (12) having at least one lens, an objective plane and a drive (18) with a cam plate (16) operable to positionally adjust of the objective (12), wherein the objective (12) is supported in a parallel guide (14), wherein the parallel guide (14) has a coupling unit (32, 34) coupling the parallel guide to the cam plate (16) so that a rotational movement of the cam plate (16) adjusts the position of the objective (12) in the parallel guide (14) with a parallel shift of the objective plane; and wherein the coupling unit (32, 34) has a press-on element (32) enabling play-free coupling of the parallel guide (14) to the cam plate (16) as well as a counter-bearing element (34) located between the press-on element (32) and the drive (18), the counter-bearing element relieving the drive (18) from the press-on element (32), the counter bearing element (34) absorbing force provided by the rotational movement of the cam plate onto the parallel guide whereby the counter bearing element prevents torque from the force from being provided to the drive from the press on element, thereby enabling the play-free coupling,
wherein the cam plate (16) has a projection (16a) extending around it in a peripheral direction substantially normal to a face of the cam plate (16), wherein the press-on element (32) is arranged along an outside cam plate circumference at the projection and the counter-bearing element (34) is arranged along an inside cam plate circumference at the projection (16a) and wherein the focus adjustment apparatus is operable to adjust focusing of the optical code reader.
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