Method for adjusting a photodetector array and a beam-splitting and detector structure for a line scan camera
AssigneeTVI Vision Oy
InventorsGuy Lemström, Mikko Ristolainen
Life of this patent
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Abstract
The present invention relates to a method for adjusting a photodetector array, and a beam-splitting and detector structure for a line scan camera, which structure comprises a photodetector array which is protected by a casing (10) from at least the back, and adjusted to the focus plan of an objective and glued to the exit surface focus plane of an objective and glued to the exit surface of the beamsplitting prism (2) by means of a support and adjusting structure. According to the invention, the supporting and adjusting structure comprising a glue layer (6) arranged between edges (19) surrounding the photodetector array (1) in the casing (10) and the exit surface (4) of the beam-splitting prism.
Claims16
A beam-splitting and detector structure for a line scan camera, comprising:
- a beam-splitting prism;
- a photodetector array mounted in a protective casing to protect at least a back of the photodetector array;
- and
- a supporting and adjusting structure disposed between an exit surface of the beam-splitting prism and the protective casing having a thickness adjusted to set the photodetector array at a focal plane of an objective, wherein the support and adjusting structure includes cured adhesive arranged between the edges of the protective casing surrounding the photodetector array and the exit surface of the beam-splitting prism to set a spacing between the edges of the protective casing and the exit surface, the adhesive allowing movement of the photodector array during adjustment to the focal plane.
A method for adjusting a photodetector array to an objective focus plane in a line scan camera, and mounting the photodetector array, in the focal plane, to the exit surface of the beam-splitting prism using a support structure, the method comprising:
- directing a line-formed image, formed from one of a light line and a light of line-formed portions, from an alignment target through a beam-splitting prism to the exit surface of the prism;
- positioning the photodetector array near the exit surface of the beam-splitting prism so that the photodetector array intersects with the line-formed image, the photodetector array being mounted in a casing having a hardenable adhesive applied on a peripheral casing edge, the adhesive contacting the exit face;
- adjusting a position of the photodetector array relative to the line-formed image so that the photodetector lies in the focal plane;
- and
- fixing the photodetector lying in the focal plane relative to the prism by hardening the hardenable adhesive contacting the exit face;
- wherein the hardenable adhesive allows adjustment of the position of the detector including tilting the detector.
A method for adjusting a photodetector array to an objective focus plane in the line scan camera, and mounting it in this position to the exit surface of the beam-splitting prism by means of a support structure, comprising:
- directing a line-formed light, or a light of line-formed portions, from an alignment target through a beam splitting prism to its exit surface;
- positioning the photodetector array near the exit surface of the beam-splitting prism so that the photodetector array intersects with a line-formed image of the alignment target on the exit surface;
- supporting the photodetector array by its casing to the beam-splitting prism with glue;
- adjusting the supported photodetector array with regard to the line-formed image which is on the exit surface of the beam-splitting prism, including tilting the photodetector array, so that light levels of the detectors of the photo detector array essentially correspond to each other;
- prior to positioning the photodetector array close to the exit surface of the beam-splitting prism, spreading the glue on the edges of the photodetector array casing, wherein the glue allows positioning of the photodetector array during the adjusting step;
- and
- hardening the glue after the adjusting step.
Dependencies are inferred from the claim text.