CN2382034Y - Laser video scanner - Google Patents

Abstract

A laser video scanner, in which the light beam emitted by the laser reaches the vibrating mirror scanner through the acousto-optic modulator, and then reflected to the polyhedron rotating mirror scanner for scanning, the reflected beam can be projected on the screen through the reflecting mirror, coaxial with the polyhedron rotating mirror A signal turntable is set, and it is placed in a photocoupler. The coupler divides the obtained synchronous signal into two outputs, one of which is controlled by the control circuit to control the vibration of the vibrating mirror, and the other is sent to the computer, and the computer sends the video signal and the vibrating mirror back to the computer. The pendulum signal is respectively sent to the acousto-optic modulator and the vibrating mirror scanner through the control circuit; it can be used for the dynamic demonstration of the image, so that the image demonstration has a TV effect.

Description

A laser video scanner

The utility model belongs to the improvement of the structure of a laser video scanner and relates to the technical field of laser image demonstration equipment production.

The laser video scanner uses computer-controlled acousto-optic modulators and scanning devices to project high-energy laser beams onto various screens according to a certain program to realize the demonstration of graphics and images. Existing demonstration scanners realize the demonstration of laser graphics by scanning with double vibrating mirrors. The scanning speed is slow and the amount of information is small. The scanning frequency is only a few hundred hertz at a scanning angle of ±7°. There is also a scanner that uses a combination of an acousto-optic modulator and a galvanometer scanner. The fast-scanning acousto-optic modulator can realize two-dimensional scanning at a small angle. After imaging, the image is then input into the two-dimensional galvanometer scanner. In order to obtain a dynamic laser image; it solves the problem of slow speed and increases the amount of information. The disadvantage is that it has been scanned twice to realize the dynamic expansion and change of the image, so it cannot display a complete video image like a TV; in addition Its dynamic laser image is limited by the scanning angle of the galvanometer and can only be used for image demonstration of a small field of view.

The purpose of the utility model is to provide a laser video scanner capable of realizing the TV effect.

The technical scheme of the utility model is achieved in this way. The designed laser video scanner consists of: laser, vibrating mirror scanner, polyhedron rotating mirror scanner, acousto-optic modulator, photoelectric coupler and computer; its structural relationship is: the laser beam emitted by the laser is modulated by acousto-optic The vibrating mirror scanner reaches the vibrating mirror scanner, and the video signal control of the acousto-optic modulator is connected to the computer through the control circuit by the cable, and the driving control of the vibrating mirror scanner is completed by connecting the cable to the control circuit; the beam reaching the vibrating mirror is reflected On the polyhedron rotating mirror, the polyhedron rotating mirror reflects the light beam to a fixed reflector, which can reflect and project the light beam on the projection screen; the polyhedron rotating mirror scanner is fixed on the driving motor shaft. , the rotary axis of the turntable should be perpendicular to the pendulum axis of the vibrating mirror, and there are 30--60 reflectors evenly placed on the side of the turntable to form a polyhedral rotating mirror; and a signal turntable is fixed on the same axis, and the signal disk is uniformly opened in the radial direction. The number of slots should be the same as the number of mirrors of the rotating mirror or in multiples, and the signal turntable should be placed in the photocoupler so that it can obtain the synchronous signal of the rotation of the polyhedron rotating mirror; the photocoupler divides the obtained synchronous signal into two One input is sent to the control circuit through the cable to control the swing of the vibrating mirror, and the other is sent to the computer to control the execution of the image software through the cable. The present invention is also characterized in that the polyhedron rotating mirror turntable can be integrated with the signal turntable, that is, slots are opened in the radial direction of the same turntable, and reflectors are arranged on its side circumference.

Because of the laser video scanner designed by the utility model, its laser beam shoots the beam with image information to the vibrating mirror scanner through the acousto-optic modulator, and the scanning of the beam in the Y-axis direction is realized by the vibration of the vibrating mirror and the beam Reflected to the polyhedral rotating mirror, since the rotating axis of the rotating mirror is perpendicular to the pendulum axis of the galvanizing mirror, and the rotating mirror rotates at a high speed, the scanning of the beam in the X-axis direction is realized, and a two-dimensional image can be obtained after reflection projection, and because of its scanning frequency It can reach more than 4000Hz, the high-speed rotation of the rotating mirror can make the field frequency reach 50Hz, and the horizontal scanning angle can reach 18°--24°, so it can meet the demonstration of dynamic images, so that the utility model can realize the image demonstration of TV effect the goal of.

Accompanying drawing 1 is the structural representation of the laser video scanner designed by the utility model, among the figure 1 is a laser, 2 is an acousto-optic modulator, 3 is a galvanometer scanner, 4 is a reflector, 5 is a polyhedron rotating mirror turntable, 6 7 is a photoelectric coupler, 8 is a control circuit, 9 is a computer, and 10 is a projection screen.

Embodiment and working principle of the present utility model will be described in detail below in conjunction with accompanying drawings.

Referring to the accompanying drawings, it is a structural representation of an example of a laser video scanner designed by the utility model. It adopts a helium-neon laser with a bandwidth greater than 1 MHz, and emits a 5mW laser beam through the acousto-optic modulator to reach the galvanometer scanner. The acousto-optic modulator can be pulsed or sinusoidal according to needs, and its video signal is controlled by a cable. The circuit is connected to the computer, and the oscillation period of the vibrating mirror scanner is not less than 50Hz, and the driving of the vibrating mirror scanning is completed by connecting the cable to the control circuit; Make the light beam reflected by the vibrating mirror reach the polyhedron rotating mirror. The polyhedron rotating mirror scanner is shown in the figure. The rotating mirror turntable is fixed on the driving motor shaft, and 30 mirrors are evenly attached to the side of the turntable. The motor speed is 150 revolutions per second, the scanning frequency of the polyhedron rotating mirror is 150×30, and a scan is completed every 3 revolutions; a signal turntable is fixed coaxially with the turning mirror, and the radial direction of the signal disk is evenly opened with slots. Consistent with the number of rotating mirrors (or in multiples, the synchronization signal obtained is more accurate), as shown in the figure, the signal turntable is placed in the photocoupler, and the light emitted from one side of the photocoupler passes through the slot and is captured. The other side receives, so that the scanning frequency signal of the rotating mirror on the rotating mirror turntable that rotates synchronously with the signal turntable can be obtained by the photocoupler; the photocoupler divides the obtained synchronous frequency signal into two channels, and sends one to the control circuit to control the vibration. The synchronous swing frequency of the mirror is sent all the way to the computer to provide a synchronous frequency signal for the execution of the image software. The computer sends the video signal of the image to the acousto-optic modulator through the control circuit according to the synchronous signal obtained. The back-swing signal of the vibrating mirror is sent to the vibrating mirror scanner through the control circuit; the computer is provided with an image demonstration driver, and the control circuit is provided with a shaping filter circuit (to complete the processing of the synchronous signal), and a data buffer output circuit (to complete the processing of the synchronous signal). Video signal processing), counter and digital-to-analog conversion circuit (to complete the processing of the oscillating mirror swing signal).

In the laser video scanner made according to the above requirements, the light beam emitted by the laser is converted into a light beam with image information in the acousto-optic modulator according to the image video signal given by the computer, and the light beam is directed to the vibrating mirror scanner, and the vibrating mirror is synchronized The signal frequency is oscillated to complete the scanning in the Y-axis direction, and the beam is reflected to the polyhedral rotating mirror. The high-speed rotation of the rotating mirror completes the scanning in the X-axis direction. The scanned beam is projected on the projection screen through the mirror, and the dynamic image can be realized. demo.

Claims (3)

1. laser video scanner, its composition has laser instrument, acousto-optic modulator, vibration mirror scanning device, polygonal-mirror scanner, photoelectrical coupler, computing machine and control circuit, it is characterized in that, the structural order of described video scanner is: the laser beam of being sent by laser instrument arrives the vibration mirror scanning device by acousto-optic modulator, the vision signal control of its acousto-optic modulator is to be connected to computing machine by cable by control circuit, and the drive controlling of vibration mirror scanning device is connected with control circuit by cable to be finished; The light beam that arrives galvanometer is reflected onto on the polygonal-mirror, and polygonal-mirror reflexes to a catoptron that fixedly installs again with light beam, and it can be with the beam reflection projection in projection screen; Described polygonal-mirror scanner is to fixedly install the tilting mirror rotating disk in the drive motor rotating shaft, and disk shaft should be vertical with the galvanometer balance staff, evenly is being provided with 30--60 face catoptron formation polygonal-mirror rotating disk side week; And the coaxial signal rotating disk that is set with, signal panels radially evenly have groove, groove quantity should be consistent with tilting mirror mirror surface number or becomes the multiple relation, and the signal rotating disk is placed photoelectrical coupler, make its synchronizing signal photoelectrical coupler that can obtain the polygonal-mirror rotation divide two tunnel outputs with the synchronizing signal that obtains, one the tunnel delivers to the swing that control circuit removes to control galvanometer through cable, one the tunnel delivers to the complete of computer control image software through cable, and computing machine is connected with control circuit by cable and transmits vision signal and galvanometer backswing signal.

2. laser video scanner according to claim 1 is characterized in that, described polygonal-mirror rotating disk can be integrated with the signal rotating disk, promptly same rotating disk radially open groove, in its side week catoptron is set.

3. laser video scanner according to claim 1 and 2 is characterized in that, is provided with filtering shaping circuit, metadata cache output circuit, counter and D/A converting circuit in the described control circuit.