CN208589036U - A kind of laser scanning device based on rotating mirror - Google Patents

Abstract

The utility model provides a kind of laser scanning device based on rotating mirror, including data processing module, optical transmitter module and optical receiver module, and the data processing module is connected respectively at optical transmitter module with optical receiver module；The data processing module is for handling received electric signal, the optical transmitter module includes laser emitter and Polyhedral rotating reflecting mirror, the Polyhedral rotating reflecting mirror is mounted in the rotary shaft of data processing module, the laser emitter is mounted on on the data processing module of Polyhedral rotating reflecting mirror the same side, and the Polyhedral rotating reflecting mirror is used to reflect the scan line without angle.A kind of laser scanning device based on rotating mirror of the utility model can generate a plurality of approximately parallel scan line simultaneously, improve the frequency of scanning, while having the advantages that structure is simple, compact, cost is relatively low.

Description

A kind of laser scanning device based on rotating mirror

Technical field

The utility model relates to laser scanning device fields, and in particular to a kind of laser scanning dress based on rotating mirror It sets.

Background technique

Current Handheld laser scanning means is generally by the way of the one-line scanning based on single oscillation reflecting mirror.It Advantage is that structure is simple, and small volume is at low cost；The disadvantage is that manual-alignment is needed to precisely align scanned pattern, and sweeping When retouching the scanned pattern of defect, if scan line falls in scanned pattern and has the region of defect (such as bar code is because of defect And break), then it can not scan, need artificial motion scan device or bar code, to make scan line be in scanned pattern There is no the region of defect could successful scan.

Multiple directions scanning (usually five sides may be implemented by complicated optical path in Flat bed laser scanning means To), but since scan line is distributed to multiple directions, scan line in each direction is less, so being still easy to appear needs The case where wanting artificial Mobile barcode or scanning means ability successful scan, especially has the case where many places defect in scanned pattern The probability of lower appearance is higher.Meanwhile structure is complicated for plat form type scanning apparatus, volume is larger, and cost is very high, is not suitable for being made as hand Hold formula scanner.

Utility model content

In view of this, to solve above-mentioned the problems of the prior art, the utility model provides a kind of based on rotary reflection The laser scanning device of mirror can generate a plurality of approximately parallel scan line simultaneously, improve the frequency of scanning, while have knot The advantages that structure is simple, compact, cost is relatively low.

To achieve the above object, the purpose of this utility model is realized at least through one of following technical solution.

A kind of laser scanning device based on rotating mirror, including data processing module, optical transmitter module and light-receiving Module, the data processing module are connect with optical transmitter module and optical receiver module respectively；The data processing module is for locating The electric signal that reason receiving module transmits, the optical receiver module are used to the optical signal of convergence being converted to electric signal；The light hair Penetrating module includes laser emitter and Polyhedral rotating reflecting mirror, and the Polyhedral rotating reflecting mirror is for reflecting sweeping for different angle Line is retouched, the Polyhedral rotating reflecting mirror is installed on the rotary shaft, the output axis connection of rotary shaft and motor, the laser emitter Be mounted on on the data processing module of Polyhedral rotating reflecting mirror the same side.

Further, the optical receiver module includes condenser, optical filter and photoelectric converter, the elder generation on optical path direction Relationship is followed successively by condenser, optical filter and photoelectric converter afterwards；The scanning light that the optical transmitter module projects is reflected across optically focused After mirror, convergence enters optical filter, finally enters photoelectric converter；The optical filter is used for filter background light, the photoelectric conversion Device is for converting optical signals to electric signal.

Further, the Polyhedral rotating reflecting mirror has N number of reflecting surface, and N is the integer (such as 3~20) more than or equal to 3； And the included angle of each reflecting surface and rotary shaft is all different.

Further, by the sequence of direction of rotation, each reflecting surface of Polyhedral rotating reflecting mirror and the angle angle of rotary shaft Degree is an arithmetic progression.

Further, each reflecting surface of Polyhedral rotating reflecting mirror and the angle of rotary shaft are less than or equal to 20 degree.

Further, it is additionally provided with shade, the shade is the impermeable baffle plate that there is opening in centre, the screening Electro-optical device is mounted at the scanning light of optical transmitter module injection, and the scanning light is irradiated to by the opening on shade wait sweep In tracing case, the shade is used to control the length of scan line.

Further, the condenser is convex lens.

Compared with prior art, the utility model has the following advantages that and technical effect: the utility model can produce simultaneously Raw a plurality of approximately parallel scan line, improves the frequency of scanning, while having structure simple, compact, cost is relatively low Advantage.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of laser scanning device based on rotating mirror of the utility model.

Fig. 2 is that the structure that a kind of laser scanning device based on rotating mirror of the utility model installs shade additional is shown It is intended to.

Fig. 3 is a kind of laser scanning device laser emitting light path schematic diagram based on rotating mirror of the utility model.

Fig. 4 is a kind of laser scanning device receiving light path schematic diagram based on rotating mirror of the utility model.

Fig. 5 is the present embodiment laser scanning device scanning ray schematic diagram.

Fig. 6 is the bar code schematic diagram that the scanning of one-line scanning device has defect.Since the whole of blocking bar code can not be gone completely Item is empty, so bar code can not be scanned correctly.

Fig. 7 is the bar code schematic diagram that the scanning of the present embodiment laser scanning device has defect.

Specific embodiment

The technical solution of the utility model is described in detail below in conjunction with attached drawing and specific embodiment.It needs to refer to Out, the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments, is based on this reality It is obtained by those of ordinary skill in the art without making creative efforts every other with the embodiment in novel Embodiment is fallen within the protection scope of the utility model.

As depicted in figs. 1 and 2, the structure for a kind of laser scanning device based on rotating mirror of the utility model is shown It is intended to, including data processing module, optical transmitter module and optical receiver module, the data processing module is respectively at optical transmitter module It is connected with optical receiver module；The data processing module is for handling received electric signal.The optical transmitter module includes laser Transmitter 110 and Polyhedral rotating reflecting mirror 120, on the rotary shaft, rotary shaft and motor (are schemed for the Polyhedral rotating reflecting mirror installation Middle summary) output axis connection.

As one embodiment, as shown in Figure 1, the Polyhedral rotating reflecting mirror 120 is mounted on data processing module 160 In rotary shaft, the laser emitter 110 be mounted on on the data processing module 160 of 120 the same side of Polyhedral rotating reflecting mirror, The Polyhedral rotating reflecting mirror 120 is used to reflect the scan line of different angle.Fig. 5 is the scanning of the present embodiment laser scanning device Light schematic diagram.

Preferably, the optical receiver module includes condenser 130, optical filter 140 and photoelectric converter 150, the optically focused Together with mirror 130, optical filter 140 are linked in sequence with photoelectric converter 150, it is mounted on data processing module 160 and not Block laser emitter 110；The condenser 130 is used to converge the light-receiving surface of optical signal to photoelectric converter 150, the filter Mating plate 140 is used for filter background light, and the photoelectric converter 150 is for converting optical signals to electric signal.

Preferably, the Polyhedral rotating reflecting mirror 120 is polyhedron, it is further preferred that N prism can be used, N is preferred It is 3~20, and the included angle of each reflecting surface and rotary shaft is all different.

Preferably, the included angle of the reflecting surface of the Polyhedral rotating reflecting mirror 120 and rotary shaft is less than or equal to 20 degree.

Preferably, 120 each adjacent two reflecting surface of Polyhedral rotating reflecting mirror and the included angle of rotary shaft differ It is worth all the same.

Preferably, it is additionally provided with shade 170, the shade 170 is mounted on data processing module, for controlling The length of scan line processed controls scanning angle.

As shown in figure 3, the laser emitter 110 issues a branch of dotted ray laser, and it is anti-to be radiated at Polyhedral rotating when work It penetrates on a reflecting surface of mirror 120.The point-like laser makes incidence angle and the angle of emergence with the rotation of Polyhedral rotating reflecting mirror 120 Constantly variation, therefore the laser reflected forms a scan line for the swing of the rotation of polygonal mirror.

Since each reflecting surface of Polyhedral rotating reflecting mirror 120 and the angle of rotary shaft are different, each reflection Scan line caused by face is not overlapped, i.e., this laser scanning device can produce the reflection with its Polyhedral rotating reflecting mirror 120 The scan line of the same number of a plurality of different location in face.Each reflecting surface of Polyhedral rotating reflecting mirror and the angle of rotary shaft are one Arithmetic progression.The difference of arithmetic progression is a.That is the angle of reflecting surface and rotary shaft is 0 degree, ± a degree, ± 2a degree, ± 3a degree ... The difference a of Polyhedral rotating mirror angle is bigger, then the spacing between scan line is bigger.The reflection of Polyhedral rotating reflecting mirror The maximum angle of face and rotary shaft is no more than 20 degree.Angle is excessive, and scan line will be made to generate apparent bending.

Optical receiver module is mounted on the lower section, top or left and right sides of optical transmitter module, sweeps it is noted that cannot block Retouch the transmitting of laser.

As shown in figure 4, for a kind of laser scanning device receiving light path signal based on rotating mirror of the utility model Figure will generate reflection, the scanned figure that the brightness of reflected light and laser irradiation arrive when scanning laser is irradiated on scanned pattern The reflectivity of case corresponding position is directly proportional, and part reflected light enters optical receiver module condenser 130, and passes through 140 mistake of optical filter After filter, converge on photoelectric converter 150.

It should be noted that because the position of recycling light optically focused will change with the position of scanning laser, optically focused mould The focal length of the condenser 130 of block should be enough short, to reduce the mobile range of recycling optical focus.Meanwhile photoelectric converter 150 light-receiving surface should be sufficiently large, covering recycling light moving range.

In the present embodiment, shade 170 can be set, shade 170 is the impermeable light trap that there is opening in a piece of centre Plate, scanning laser pass through the opening of shade 170, are irradiated on scanned pattern, the both ends of scanning ray are by shade 170 are blocked.Length of the shade 170 to control scan line, that is, control the angle of scanning.

Data processing module 160 includes the place for being used to handle data on electronic circuit board and being mounted on electronic circuit board Manage device.The electronic circuit board is also the bracket of entire scanning means, optical receiver module, optical transmitter module (including laser simultaneously Transmitter 110 and Polyhedral rotating reflecting mirror 120), the component parts such as shade 170 are all mounted thereon.Data processing mould Block can obtain information (such as the yardage of scanned pattern by analyzing the optical scanning signal that sends of photoelectric converter 150 According to).

Fig. 6 is the bar code schematic diagram that the scanning of one-line scanning device has defect.Since the whole of blocking bar code can not be gone completely Item is empty, so bar code can not be scanned correctly.Fig. 7 is the bar code schematic diagram that the scanning of the present embodiment laser scanner device has defect. As long as have in figure a scan line can complete blocking bar code, can be with successful scan.

In conclusion a kind of laser scanning device based on rotating mirror of the utility model can generate simultaneously it is a plurality of Approximately parallel scan line, improves the frequency of scanning, while having the advantages that structure is simple, compact, cost is relatively low.

Claims (7)

1. a kind of laser scanning device based on rotating mirror, including data processing module, optical transmitter module and light-receiving mould Block, the data processing module are connect with optical transmitter module and optical receiver module respectively；The data processing module is for handling The electric signal that receiving module transmits, the optical receiver module is for receiving optical signal and being converted to electric signal；It is characterized by: institute Stating optical transmitter module includes laser emitter and Polyhedral rotating reflecting mirror, and the Polyhedral rotating reflecting mirror is for reflecting different angles The scan line of degree, the Polyhedral rotating reflecting mirror are installed on the rotary shaft, the output axis connection of rotary shaft and motor, the laser Transmitter is mounted on data processing module.

2. a kind of laser scanning device based on rotating mirror according to claim 1, it is characterised in that: the light connects Receiving module includes condenser, optical filter and photoelectric converter, and the precedence relationship on optical path direction is followed successively by condenser, optical filter And photoelectric converter；The optical filter is used for filter background light, and the photoelectric converter is for converting optical signals to electric signal.

3. a kind of laser scanning device based on rotating mirror according to claim 1, it is characterised in that: the multi-panel Rotating mirror has N number of reflecting surface, and N is the integer more than or equal to 3；And the included angle of each reflecting surface and rotary shaft is not It is identical.

4. a kind of laser scanning device based on rotating mirror according to claim 3, it is characterised in that: press rotation side To sequence, the included angle of each reflecting surface of Polyhedral rotating reflecting mirror and rotary shaft is an arithmetic progression.

5. a kind of laser scanning device based on rotating mirror according to claim 4, it is characterised in that: Polyhedral rotating Each reflecting surface of reflecting mirror and the angle of rotary shaft are less than or equal to 20 degree.

6. a kind of laser scanning device based on rotating mirror according to claim 1, it is characterised in that: be additionally provided with Shade, the shade are the impermeable baffle plate that there is opening in centre, and the shade is mounted on optical transmitter module and penetrates At scanning light out, the scanning light is irradiated on pattern to be scanned by the opening on shade, and the shade is used In the length of control scan line.

7. a kind of laser scanning device based on rotating mirror according to claim 2, it is characterised in that: the optically focused Mirror is convex lens.