Abstract: A modular unit is designed for an electronic pen. The modular unit comprises a carrier with a receiver for a writing implement, a printed circuit board, a two-dimensional radiation sensor mounted on the printed circuit board, and an imaging unit which defines an image plane. The carrier, the printed circuit board, and the imaging unit are joined together with the imaging unit facing the radiation sensor to locate the image plane at the radiation sensor. A radiation source, such as an LED or a laser diode, may be arranged on the printed circuit board or mounted in a holder on the imaging unit. The imaging unit may be implemented as a boresight unit for controlling the spatial origin of radiation transmitted towards the radiation sensor. The boresight unit may comprise a radiation-transmitting channel, an imaging lens, and a redirecting mirror in the channel.

Abstract: A camera having a lens and a sensor between which one or more transparent plates can selectively be disposed. The plates may have different thickness or indices of refraction, or they may have the same thickness and index of refraction and various combinations of them can be employed. Alternatively, a single plate may be used. The single plate may have one or more regions of different thickness or index of refraction or both. One option may including removing any of the plates from the area between the lens and sensor. With any of these various embodiments, the object distance of best focus is varied when the plate is added or removed or different areas on a plate are used or different combinations of plates are added.

Abstract: 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.

Abstract: An optical system comprises an imaging arrangement (1?, 1?) that transmits an image to an image plane; a sensor; and one or more locator elements that locate the imaging arrangement (1?, 1?) to provide the image on the sensor. Tolerances of the locator element(s) allow a lateral translation and a rotation of the imaging arrangement (1?; 1?) around a nominal rotation point. A parameter of the optical system is selected such that a movement, resulting from either the lateral translation or the rotation, of an optical axis (OA) on the sensor is at least partly counteracted by a movement, resulting from either the lateral translation or the rotation, of the image on the sensor with respect to the optical axis (OA). Thereby, the optical system is wholly or partly self-compensating with respect to tolerances affecting the angular position or the lateral position of the imaging arrangement.

Abstract: An optical system comprises an optical axis (OA) extending longitudinally between an object plane and an image plane; an imaging arrangement (1?, 1?) that transmits an image from the object plane to the image plane; a substrate with a sensor device; and one or more locator elements which locate the imaging arrangement (1?, 1?) to provide the image on the sensor device. Tolerances of the locator element(s) act to allow a lateral translation the imaging arrangement (1?; 1?) and a rotation of the imaging arrangement (1?; 1?) around a nominal rotation point. A parameter of the optical system is selected such that a movement, resulting from either the lateral translation or the rotation, of the optical axis (OA) on the sensor device is at least partly counteracted by a movement, resulting from either the lateral translation or the rotation, of the image on the sensor device with respect to the optical axis (OA).

Abstract: A modular unit is designed for an electronic pen. The modular unit comprises a carrier (70) with a receiver for a writing implement, a printed circuit board (72), a two-dimensional radiation sensor (78) mounted on the printed circuit board, and an imaging unit (82) which defines an image plane. The carrier (70), the printed circuit board (72), and the imaging unit (82) are joined together with the imaging unit (82) facing the radiation sensor (78) to locate the image plane at the radiation sensor (78). The modular unit may comprise an analysis system dedicated to a particular optical analysis application, such as position determination based on images of a position-coding pattern. A radiation source, such as an LED or a laser diode, may be arranged on the printed circuit board or mounted in a holder on the imaging unit. The imaging unit (82) may be implemented as a boresight unit for controlling the spatial origin of radiation transmitted towards the radiation sensor (78).

Abstract: A method and an arrangement for presentation of a graphical representation of a handwritten message on a graphical screen. Position data and time data are recorded, indicating positions and points of time for the handwritten message. An image area in the graphical representation of the handwritten message is identified based on said position data and said time data, the size of the image area being a subportion of the graphical representation of the handwritten message. Finally, display data is provided to a screen, which display data comprises a graphical representation of the subportion of the handwritten message in the identified image area.

Abstract: An optical system, for example in an optical pen, is arranged to illuminate an object plane and to transmit an image of the object plane to an image plane. The system has an optical component that reflects first radiation, which is emitted by a radiation source, towards the object plane while also transmitting second radiation from the object plane towards the image plane. The optical component comprises a reflective surface portion arranged to reflect the first radiation, and a spatially separate transparent surface portion arranged to transmit the second radiation.

Abstract: An optical system, for example in an optical pen, is arranged to illuminate an object plane and to transmit an image of the object plane to an image plane. The system has an optical component that reflects first radiation, which is emitted by a radiation source, towards the object plane while also transmitting second radiation from the object plane towards the image plane. The optical component comprises a reflective surface portion arranged to reflect the first radiation, and a spatially separate transparent surface portion arranged to transmit the second radiation.

Abstract: A method and an arrangement for presentation of a graphical representation of a handwritten message on a graphical screen. Position data and time data are recorded, indicating positions and points of time for the handwritten message. An image area in the graphical representation of the handwritten message is identified based on said position data and said time data, the size of the image area being a subportion of the graphical representation of the handwritten message. Finally, display data is provided to a screen, which display data comprises a graphical representation of the subportion of the handwritten message in the identified image area.