3results about How to "Stable reading" patented technology

This invention discloses an optical disc and an optical disc device. The optical disc includes a groove bottom channel and a groove top channel formed by spiral grooves. Both the groove bottom channel and the groove top channel have a plurality of recording blocks capable of recording data. Each recording block contains a predetermined number of frames, and each frame has a frame synchronization field of length T at a predetermined position. In adjacent groove bottom channels and groove top channels along the radial direction of the optical disc, the recording block in the groove bottom channel is the first recording block, and the recording block in the groove top channel is the second recording block. The first recording block and the second recording block are offset from each other by an angular offset length along the circumference of the optical disc. The optical disc disclosed in this invention has the advantages of a small reading signal amplitude during optical disc reading, thus eliminating the need for a large dynamic range and very high SNR performance in the reading signal processing circuit, thereby simplifying the implementation of the reading signal processing circuit.

The utility model discloses a mechanical large-diameter thread outer diameter measuring device, which comprises a bottom plate, and two positioning sliding rods and two measuring sliding rods which are arranged on the bottom plate, and the two positioning sliding rods can move relatively along the upper surface of the bottom plate, so that the two positioning sliding rods are close to each other to radially clamp a boss of a workpiece to be measured. The two measuring sliding rods can move relatively along the upper surface of the bottom plate, so that the two measuring sliding rods are close to each other and respectively cling to two sides of a thread of a to-be-measured workpiece, scale marking lines are arranged on the upper surface of the bottom plate, and the lower ends of the measuring sliding rods are aligned with the scale marking lines. The length limit of an outer measuring claw of a vernier caliper is broken through, the large-diameter thread diameter measuring device is suitable for measuring the outer diameter of a large-diameter thread, the measurable thread diameter range is wide, the large-diameter thread diameter measuring device is particularly suitable for batch detection of a production line, personal errors are reduced through a positioning sliding rod and scale marks, the measuring precision and stability are improved, only three steps of fixing, pulling and reading are needed during operation, the single-time measuring time is short, and the efficiency is improved. The operation process is simplified, and stable fixation, automatic adaptation and rapid reading are achieved.

The utility model discloses a flow regulation type gas supply device, which belongs to the technical field of chemical equipment and comprises a cabinet. A main pipe is fixedly mounted at the top of the cabinet, a plurality of branch pipes are fixedly mounted on the bottom side of the main pipe, a flow valve is arranged on each branch pipe, and a flow meter is arranged at the discharging end of the main pipe; a bracket is fixedly mounted at the bottom in the cabinet; a plurality of self-calibration fixing mechanisms are arranged on the bracket; and a plurality of anti-leakage automatic connecting mechanisms are arranged at the inner top of the cabinet. The gas cylinders are limited and fixed through the self-calibration fixing mechanisms, the leakage-proof automatic connecting mechanisms are started to be connected with the gas cylinders, the gas cylinders can supply fluorine to the main pipe through the branch pipes, and the gas cylinders can be connected with the main pipe in parallel through the leakage-proof automatic connecting mechanisms to achieve synchronous supply of fluorine. The fluorine flow of a single gas cylinder is controlled through a flow valve; when fluorine of a single gas cylinder is completely consumed and needs to be replaced, the reading of the flowmeter is kept stable by adjusting the fluorine flow of other gas cylinders.