A miniaturized optical component (36) for a camera pen has the shape of a plate and comprises at least two non-overlapping radiation-transmitting sections: an imaging section (36′) configured to transmit an image of an object plane, and an illuminating section (36″) configured to transmit illuminating radiation towards the object plane. Passive optical elements may be incorporated in the component to provide the imaging and illuminating sections, e.g. an image-generating surface structure, an illumination-controlling surface structure, a radiation filter, a stray light shield, and an aperture stop. These optical elements may be provided as well-defined surface structures and layers on a plate substrate. The optical component may be manufactured as a wafer structure comprising a plurality of these optical components. A camera housing (22) may be provided with a first mounting structure (56) for the optical component (36), a second mounting structure (64) for an image sensor (11) configured to detect the image, and a third mounting structure (66) for a radiation source (13) configured to generate the illuminating radiation. An elongate guide pipe (24) for receiving a stylus (8) may be received in and joined to an elongate recess (28) in an exterior wall portion of the camera housing (22).