A miniature photoelectric sensor

Abstract

The invention discloses a minitype photoelectric sensor. The minitype photoelectric sensor comprises a light source device, an optical prism and a circuit board. The light source device is installed in the optical prism and electrically connected with the circuit board. The light source device is used for emitting a light beam. The circuit board is positioned below the light source device. The upper part of the optical prism forms an optical receiving lens which is used for collecting the reflected light beam. The lower part of the optical prism forms an optical condensing lens which is used for collecting the light beam received by the optical receiving lens to the circuit board. The circuit board is provided with a photoelectric receiving tube and a signal processing circuit. The photoelectric receiving tube is installed on a position, closest to the light source device, on the circuit board. The signal processing circuit is connected with the photoelectric receiving tube through thecircuit board. The beneficial effect is that the volume is tiny, the same optical prism is used for finishing the sending and the receiving of the light beam, a measuring distance of the photoelectric sensor is further improved, and a main working circuit of the photoelectric sensor is used, so the signal to noise ratio and the disturbance resisting capacity of the sensor are improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric sensors, in particular to a miniature photoelectric sensor. Background technique [0002] In the technical field of industrial automation, a large number of photoelectric sensors for measuring position and distance are required. With the increasing degree of automation and mechanical complexity, the improvement of the miniaturization of sensors is increasingly demanding. [0003] Existing miniature photoelectric sensors are mainly optical fiber photoelectric sensors, which use the light guiding properties of optical fibers to change optical fibers into prisms, and use the good optical conductivity of optical fibers to complete the functions of emitting light and receiving light that optical prisms in photoelectric sensors complete. . Due to the small size of the optical fiber, there is a certain degree of bendability, and the optical fiber can be used to form a miniature photoelectric senso...

AI Technical Summary

Problems solved by technology

Due to the small size of the optical fiber, there is a certain degree of bendability, and the optical fiber can be used to form a miniature photoelectric sensor with a diameter of only 3mm in the transmitting and receiving part, such as the small optical fiber sensor series of Japanese Keyence, Japanese Omron and other companies; but the optical fiber is easy to break, and the optical fiber It also needs to be connected to a fiber amplifier for amplification and signal processing, and there is also a certain volume requirement for installation, so the wide application of fiber optic sensors is limited to a certain extent

There is another type of miniature photoelectric sensor that is realized by using a sensor-specific circuit and tiny components or prisms, such as the Swedish Contrinex company, the M4 series of the German P&F company and the M6 ​​series of the Japanese Omron company. The process is very demanding and therefore expensive, limiting their widespread use

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