Liquid Focal lens

2020/02/10

As determined by the principle of optical imaging, the relative position of lens glass and camera sensitive chip needs to be adjusted to focus object planes of different depths while the lens is set in a fixed position, for any optical imaging lens has only one clear focusing and imaging position under static status (object plane position focused by lens is in one-to-one correspondence relation with the image plane position of lens according to the Principles of Optics, and there will be only one clear focusing object position if lens is not adjusted). Such adjustment is generally called focusing.As determined by the principle of optical imaging, the relative position of lens glass and camera sensitive chip needs to be adjusted to focus object planes of different depths while the lens is set in a fixed position, for any optical imaging lens has only one clear focusing and imaging position under static status (object plane position focused by lens is in one-to-one correspondence relation with the image plane position of lens according to the Principles of Optics, and there will be only one clear focusing object position if lens is not adjusted). Such adjustment is generally called focusing.

Liquid Focal lens

In general, manual and electric focusing is supported by the present optical lens; for example, the focusing of focal lens is adjusted by rotating a group of knobs on lens; the common industrial focal lens are rotated manually, judged via naked eyes or algorithm and operators need to check if focusing is completed while rotating the knobs. Merits of manual focusing: Low cost of lens, small product volume and easy maintenance. Demerits: Low adjustment efficiency and precision, instability and remote control not supported. Electric focusing has unmatched merits than manual focusing due to the necessity of high focusing efficiency, stability and also remote control in industrial applications or security fields. However, electric focusing has such demerits as too high cost, too large volume, poor focusing efficiency, difficult maintenance, high maintenance cost and limited service life.

Liquid Focal lens

As the major problem of electric focusing, the motor-driven lens set has linear motion in lens, which belongs to mechanical motion, and in many cases, the glasses are also revolving in the motion, so motion process needs to be repeated in order to judge if focusing is completed via algorithm. This process will greatly reduce the focusing efficiency. For lens, glass coaxiality has great influence on the imaging quality and glass motion also has major influence on the overall coaxiality. The motor drive, which has been miniaturized as much as possible, has to be used as the precise glass motion mechanism of motor and thus increasing the volume of lens and causing high cost and low maintainability.

By realizing focusing in the lens, the liquid glass overturns the existing focus method in principle. Focusing of liquid glass, which is similar with that of human’s eyes, can realize shape change (change of front/rear curvature of glass) through the certain voltage applied. The overall structure is much smaller than that of motor, for such change brings no change or rotation of body and ensures high controllability, stability and efficiency (millisecond class adjustment speed).