Abstract: A non-contact electronic level has a light source, a vial having a bubble and positioned to be irradiated by light from the light source, and a photo sensor located at a position corresponding to the bubble at a fixed distance from the vial. The photo sensor captures an image of the bubble after the vial is irradiated by the light source. An image processing unit is electrically coupled to the photo sensor and converts the image of the bubble into an electronic level signal by comparing the centroid of the image of the bubble with a predetermined point.

Abstract: The present invention relates to a driving device for a scanning module. An active gear wheel and a passive gear wheel are disposed respectively on two rigid frames. These two rigid frames are connected by a rigid component to avoid relative displacement between the two wheels due to external force or change of temperature. The rigid component of the present invention may also be adopted as a guiding track for the scanning module.

Abstract: A non-contact electronic level has a light source, a vial having a bubble and positioned to be irradiated by light from the light source, and a photo sensor located at a position corresponding to the bubble at a fixed distance from the vial. The photo sensor captures an image of the bubble after the vial is irradiated by the light source. An image processing unit is electrically coupled to the photo sensor and converts the image of the bubble into an electronic level signal by comparing the centroid of the image of the bubble with a predetermined point.

Abstract: A non-contact electronic level has a light source, a vial having an air bubble and positioned to be irradiated by light from the light source, a photo sensor located at a position corresponding to the air bubble at a fixed distance from the vial, with the photo sensor capturing an image of the air bubble after the vial is irradiated by the light source, and an image processing unit electrically coupled to the photo sensor and converting the image of the air bubble into an electronic level signal.

Abstract: An invertible laser instrument that has a housing, a laser module disposed inside the housing and having a tenon disposed at the bottom of the laser module, a base disposed at the bottom of the laser module and having a hole at the center of the base, with the tenon inserted into the hole, and a resilient component disposed in the hole to secure the tenon in the hole. The resilient component secures the laser module to the base, so that the laser module will not fall out from the base when the laser instrument is inverted.

Abstract: The present invention relates to a driving device for a scanning module. An active gear wheel and a passive gear wheel are disposed respectively on two rigid frames. These two rigid frames are connected by a rigid component to avoid relative displacement between the two wheels due to external force or change of temperature. The rigid component of the present invention may also be adopted as a guiding track for the scanning module.