CN214097964U - Zoom lens system that shakes - Google Patents

Abstract

The utility model discloses a zoom mirror system that shakes is equipped with a set of focusing lens, a set of mirror, a field lens that shakes, and incident laser jets out behind above-mentioned three characteristic portion in proper order, a set of focusing lens is a set of fixed lens and a set of movable lens of coaxial line, and movable lens can follow fixed lens's axis back-and-forth movement, changes the light beam divergence angle through the change of lens interval, a set of mirror that shakes is two can pivoted mirror pieces. The zoom lens system has one focusing lens group to regulate the divergence angle in real time, and one field lens may change the focus of the outgoing light via changing the divergence angle of the incident light, so that the lens system can complete the change of the size of the working breadth without replacing the field lens. Therefore, compare in current mirror system that shakes, the utility model discloses do not need additionally to dispose the field lens of different focuses, practice thrift manufacturing cost, improve production efficiency.

Description

Zoom lens system that shakes

Technical Field

The utility model relates to a zoom mirror technical field that shakes specifically is a zoom mirror system that shakes.

Background

The galvanometer system consists of a group of galvanometers and a field lens, and the working process is to change the path of a beam of parallel laser to emit to a working plane by using the group of galvanometers and focus the parallel beam on the working plane by using the field lens arranged in front of the working plane.

The field lens, in particular to an F-Theta flat field focusing lens, is applied to a laser scanning or engraving system. The field lens can solve many of the problems associated with laser scanning. The field lens is divided into a plurality of models due to different focal lengths, so when the working breadth and the working distance are changed, other models of field lenses corresponding to the focal lengths must be replaced. The field lens is parallel in multiple models and lacks the current situation of universality, and certain trouble and cost burden are brought to production.

The above-mentioned disadvantage of lack of versatility is further explained. A galvanometer system can change the size of a working surface by replacing field lenses with different focal lengths. The breadth refers in particular to the distribution plane of the laser focal point, namely the working plane for focusing the laser by the galvanometer system. The larger the breadth of the galvanometer system is, the longer the focal length of the field lens to be equipped is, and the focusing distance, namely the working distance is increased along with the focal length. The energy is inversely proportional to the square of the focal spot radius as well as to the square of the distance. Therefore, when a galvanometer system is replaced by a field lens with a larger width, the focused energy is obviously weakened due to the increase of the working distance and the increase of the theoretical focusing light spot. Moreover, the working distance of the galvanometer system which can not change the focal length is constant, and the working distance of the galvanometer system cannot be shortened due to the reduction of the breadth.

The weaker the energy of the generated laser focus, the poorer the working effect. Therefore, in actual production, a galvanometer system much larger than the size of the current working target should not be selected. For example, with a working target size within a rectangle of 100mm by 100mm, a galvanometer system with a format of 110mm by 110mm is preferred over a galvanometer system with a format of 130mm by 130 mm. Although 130mm x 130mm can cover an area of 100mm x 100mm, we still prefer to use a 110mm x 110mm galvanometer system with a smaller web and more powerful because the energy decreases as the web increases and the working distance increases. This example shows that in practical production, a plurality of field lenses with different focal lengths need to be prepared for one galvanometer system to meet the requirements of different sizes of webs. The purchase cost and the replacement and debugging operation of the matched assembly are obvious defects of the existing galvanometer system, and therefore, a zoom galvanometer system is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a zoom galvanometer system to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a zoom galvanometer system is provided with a group of focusing mirrors, a group of galvanometers and a field lens, wherein incident laser sequentially passes through the three characteristic parts and then is emitted, the group of focusing mirrors are a group of fixed lenses and a group of movable lenses which are coaxial, the movable lenses can move back and forth along the axes of the fixed lenses, and the divergence angle of a light beam is changed by changing the distance between the lenses.

Preferably, the group of galvanometers is two rotatable reflecting mirrors.

Preferably, the field lens is a focusing lens with a fixed focal length.

Compared with the prior art, the beneficial effects of the utility model are that:

the zoom galvanometer system is provided with a field lens, and incident light of the field lens passes through the group of focusing lenses arranged in the utility model in advance to adjust the divergence angle in real time, so that the field lens can change the working distance and the focusing breadth of emergent light by changing the divergence angle of the incident light, and the galvanometer system can finish the change of the working breadth without changing the field lens; it is proposed to change the incident light state of the field lens from parallel light to non-parallel light with a divergence angle that is continuously adjustable. Creativity lies in providing a mechanism that can adjust field lens incident light divergence angle to combine this mechanism and the mirror system that shakes into a zoom mirror system that shakes, the practicality lies in not needing the field lens of extra configuration different focuses, just can realize marking the continuous variation of mark distance and mark breadth, and the performance is superior to prior art far away and can only rely on changing different field lenses and realize marking the change of distance and breadth, and prior art still can not realize the continuous adjustable of breadth. Therefore, the production cost is saved, and the production efficiency is improved.

Drawings

Fig. 1 is a schematic view of an optical path of a conventional galvanometer system according to the present invention.

Fig. 2 is a schematic isometric view of a zoom galvanometer system according to the present invention.

Fig. 3 is a schematic bottom view of a zoom galvanometer system according to the present invention.

Fig. 4 is a schematic front view of a zoom galvanometer system according to the present invention.

In the figure: 1. a movable lens; 2. a first motor; 3. fixing the lens; 4. incident laser; 5. a field lens; 6. a first mirror plate; 7. a second mirror; 8. a second motor; 9. a third motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a zooming galvanometer system is provided with a group of focusing mirrors, a group of galvanometers and a field lens 5, wherein incident laser 4 is emitted after sequentially passing through the three characteristic parts;

the group of focusing mirrors are a group of fixed lenses 3 and a group of movable lenses 1 which are coaxial, the movable lenses 1 can move back and forth along the axes of the fixed lenses 3, and the group of movable lenses 1 can be driven by a first motor 2 or pushed manually;

the group of galvanometers comprises two rotatable first reflecting mirrors 6 and two rotatable second reflecting mirrors 7, and the two rotatable first reflecting mirrors 6 and the two rotatable second reflecting mirrors 7 are respectively driven by a second motor 8 and a third motor 9;

one field lens 5 is a focusing lens with a fixed focal length.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A zoom lens system, comprising: the laser beam laser device is provided with a group of focusing lenses, a group of vibrating lenses and a field lens, incident laser beams sequentially pass through the group of focusing lenses, the group of vibrating lenses and the field lens and then are emitted, the group of focusing lenses are a group of fixed lenses and a group of movable lenses which are coaxial, the movable lenses can move back and forth along the axes of the fixed lenses, and the divergence angle of the laser beams is changed by changing the distance between the lenses.

2. A zoom lens system according to claim 1, wherein: the group of galvanometers are two rotatable reflecting mirrors.

3. A zoom lens system according to claim 1, wherein: the field lens is a focusing lens with fixed focal length.

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