Device for non-contact object handling

Abstract

A non-contact handling tool (8) for picking up an object (3), the tool comprising an ultrasonic transducer (10) extending between a reflective side and a picking side configured to emit ultrasounds forming, in a near field area of the picking side, an excess-pressure wave, and a fluid suction system configured to suction a fluid towards the picking side, forming in said near field area an under-pressure. The fluid suction system comprises at least a fluid suction channel (30) disposed in the ultrasonic transducer. The transducer has a height defined between the picking side and the reflective side corresponding to a half wavelength of the ultrasounds generated in the transducer.

Description

TECHNICAL FIELD[0001]The present invention relates to a device for the non-contact handling of an object. The invention more particularly relates to a device for handling small-sized objects, in particular smaller than a volume of 10−6 m3 or smaller than a mass of the order of 20 g.STATE OF THE ART[0002]The methods called “pick and place” allow the handling of an object by using tools to carry out extremely fast-paced handlings for displacing several hundred objects per minute. “Pick and place” tools usually use suction devices called “vacuum grippers”, for suctioning the object in a direction opposite to gravity, immobilising the object against the tool and thus displacing it to the required place. As for handling objects of the order of the centimetre, the purpose is to grip the object while contending the effects of gravity. For this object range, gravity is the main force which is exerted on the object, gravity being in particular much higher than the adhesion forces between the...

AI Technical Summary

Benefits of technology

The present invention is a device for handling small objects using ultrasounds. The device uses near field ultrasounds as repulsive force to counteract the attractive force and achieve a maximum levitation force on the object. By adjusting the dimensions of the device to the size of the object, the device can adapt to different objects and maintain a stable suspension during handling. The device can also maintain a deviation between the picking side and the surface of the object, which is important for handling objects with small dimensions. Overall, the device provides a stable and efficient way for handling small objects.

Problems solved by technology

On the other hand, the adhesion forces which were insignificant for larger objects, become overpowering and much stronger than gravity.

Thus, when the object is pressed against the tool, it becomes difficult to detach the object from the tool due to the adhesion forces between the object and the tool.

This disrupts the displacement speed and the positioning precision of the displaced object.

Moreover, at this scale, every contact between the object and the suction head may damage the object by generating microparticles which can also disrupt tool operation.

Thus, the suction devices are not satisfactory for handling small-sized or fragile objects.

However, these two types of levitation are only applicable to objects that are sensitive to electric or magnetic fields.

In addition, there is a risk that the object placed in a magnetic or electric field becomes damaged.

The main drawback of aerodynamic methods is that the levitating object has very little lateral stability.

This main drawback of this technique is that handlings are restricted to the area between the generator and the reflector, and thus, solely at node level.

This method is hardly ever used as its range of application is restricted to a vertical displacement of the object, from bottom to top, by placing a transmitter under the object thereby, restraining its range of application.

The encumbrance of such tools for pick and place applications or for other applications for handling objects in restricted spaces, is a drawback and sometimes makes the use of such tools impossible for certain applications.

Furthermore, a larger body of the tool can also impact on the performance (rapidity and precision) of robot machines bearing these tools.

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