TW201306407A - Linear scan structure and laser designator using the same - Google Patents

Abstract

A linear scan structure includes a twisting element, a scan mirror and a plurality of grating strips. The scan mirror is connected to the twisting element to vibrate reciprocally at a predetermined range of angle. The grating strips are formed on the scan mirror for receiving a laser beam. The laser beam is diffracted by the grating strips and a plurality of diffraction beams is generated accordingly.

Description

Linear scanning structure and laser marker using the same

The present invention relates to a laser marker, and more particularly to a linear scanning structure and a laser marker using the same.

In general, a single-point projection laser marker projects a laser beam onto a screen to form a spot. When the user makes a briefing, the laser beam must be moved to drop the laser spot at the desired position. . However, a single spot can have limited effects and cannot cover a wide range of areas. As far as the conventional laser marker is used, it is often necessary to mark a piece of text or a key area in the briefing when it is used for presentation, but since the conventional laser pointer can only output a single spot, it must be always used to indicate the key point. Dangling the laser spot on the projection screen is not only uncomfortable, but also easy to interfere with thinking and affect the work of the briefing.

The present invention relates to a linear scanning structure and a laser marker using the linear scanning structure, which can generate a diffracted beam by diffraction of a laser beam.

According to an aspect of the invention, a linear scanning structure is provided comprising a torsion member, a scanning mirror and a plurality of grating strips. The scanning mirror is connected to the torsion member, and the scanning mirror can reciprocally vibrate with the torsion member as an axis within a predetermined angle. The grating stripe is formed on the scanning mirror and is configured to receive a laser beam, and the grating stripe further diffracts the laser light to generate a plurality of diffracted beams.

In one embodiment, the diffracted beams respectively vibrate in the direction of vibration of the scanning mirror to form a plurality of scanning beams, and the scanning beam is projected onto a projection surface to generate a plurality of projection spots.

In accordance with another aspect of the invention, a laser marker is provided that includes at least one laser source and a linear scanning structure. A laser source is used to emit a laser beam. The linear scanning structure comprises a torsion member, a scanning mirror and a plurality of grating strips. The scanning mirror is connected to the torsion member, and the scanning mirror can reciprocally vibrate in a center of the torsion member at a predetermined angle. The grating strips are formed on the scanning mirror and can be used to receive the laser beams, and the grating strips can further diffract the laser beam to generate a plurality of diffracted beams.

In one embodiment, the diffracted beams respectively vibrate in the direction of vibration of the scanning mirror to form a plurality of scanning beams, and the scanning beam is projected onto a projection surface to generate a plurality of projection spots.

In order to provide a better understanding of the above and other aspects of the present invention, the following detailed description of the embodiments and the accompanying drawings

The linear scanning structure of the embodiment and the laser marker using the same are formed on the mirror surface of the scanning mirror to form a grating stripe, so that the reflected laser beam is diffracted by the grating stripe to form a plurality of diffracted beams. When the scanning mirror reciprocates on a single axis, the diffracted beams respectively vibrate to form a plurality of small-angle scanning beams, and are connected to each other as a large-angle scanning beam. When these scanning beams are projected onto a projection surface (such as a screen), a plurality of projection spots can be formed on the screen. When the scanning mirror performs high-speed reciprocating vibration, these spots are also oscillated at the same time on the projection surface. These oscillating spots are formed into a continuous line segment by the human "visual persistence" phenomenon, and the scanning beam is scanned. The angle can be up to 180 degrees. Therefore, when it is necessary to project a line, it is not necessary to twist the scanning mirror at a large angle as in the prior art or to sway the laser pointer from side to side.

The following is a detailed description of various embodiments, which are intended to be illustrative only and not to limit the scope of the invention.

Please refer to FIGS. 1A and 1B , which respectively illustrate schematic diagrams of a linear scanning structure applied to a laser marker according to an embodiment of the invention. The laser marker 100 includes a laser source 110 and a linear scanning structure 120. The laser source 110 is used to emit a laser beam B. The linear scanning structure 120 includes a torsion member 122, a scanning mirror 124, and a plurality of grating strips 126. The scanning mirror 124 is coupled to the torsion member 122 and twisted about the torsion member 122 to reciprocally vibrate the scanning mirror 124 at a predetermined angle. A grating stripe 126 is formed on the scanning mirror 124 for receiving the laser beam B and causing the laser beam B to be diffracted via the grating stripe 126 to form a plurality of diffracted beams D1 to D3.

In FIG. 1A, the scanning mirror 124 is in a stationary state, and the generated laser beam B is formed only on the projection plane 10 to form a plurality of projection spots P1 to P3, which include the main reflected beam D1. The projection spots P2 and P3, which are formed by the projection spot P1 and the ±N-order sub-reflected beams D2 and D3, are positive integers greater than or equal to 1. In Fig. 1A, only the projection spots P2 and P3 generated by the ±1st-order sub-reflected beams D2 and D3 are shown, but not limited thereto. In Fig. 1B, when the scanning mirror 124 performs reciprocating vibration, the diffracted beams D1 to D3 vibrate in the vibration direction of the scanning mirror 124 to form a plurality of small-angle scanning beams C1 to C3. The projections of the scanning beams C1 to C3 are repeated and disappeared by a plurality of projection spots, and the line segments L1 to L3 as shown in FIG. 1B can be seen on the projection plane 10 by the phenomenon of persistence of the eyes. Therefore, the projection lines 10 are formed on the projection plane 10 instead of the projection spots P1 to P3, but are connected by a plurality of line segments L1 to L3.

Please refer to FIGS. 2A-2C, wherein FIG. 2C is a schematic diagram of the linear scanning structure 120, and FIGS. 2A and 2B are respectively a II cross-sectional view of the grating stripe 126 of the linear scanning structure 120 of FIG. 2C. In Fig. 2A, the scanning mirror 124 has a mirror surface 124a, and the grating stripe 126 is formed on the mirror surface 124a in a periodic concave-convex structure. In Fig. 2B, the scanning mirror 124 has two mirror surfaces 124a and 124b, and the grating strips 126 are formed on the two mirror surfaces 124a and 124b, respectively, in a periodic concave-convex structure. It is assumed that the period of the grating stripe 126 is d, and the wavelength of the laser beam B is λ, and the incident angle of the laser beam B is θ. When 2 dsin θ = Nλ is satisfied , a diffraction phenomenon is generated to form an N-order winding. Shoot the beam.

Please refer to FIGS. 2B and 3 , wherein FIG. 3 is a schematic diagram of a linear scanning structure applied to a dual laser source according to an embodiment. When the scanning mirror 124 is a double-sided mirror, the grating strips 126 can be respectively formed on the two mirror surfaces 124a and 124b, so that the reflected two laser beams B1 and B2 are diffracted by the grating strips 126 and respectively respectively on the two projection planes 11 Scan lines S1 and S2 are formed on and below 12.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

10. . . Projection plane

100. . . Laser marker

110. . . Laser source

120. . . Linear scan structure

122. . . Torsion piece

124. . . Scanning mirror

124a, 124b. . . Mirror surface

126. . . Grating stripe

B, B1, B2. . . Laser beam

C1～C3. . . Scanning beam

D1～D3. . . Diffracted beam

L1～L3. . . Line segment

P1 ~ P3. . . Projection spot

S, S1, S2. . . Scanning line

1A and 1B are schematic views respectively showing a linear scanning structure applied to a laser marker according to an embodiment of the present invention.

2A and 2B are respectively a cross-sectional view of the I-I of the grating stripe of the linear scanning structure of FIG. 2C.

Figure 2C is a schematic diagram of a linear scan structure.

FIG. 3 is a schematic diagram showing a linear scanning structure applied to a dual laser light source according to an embodiment.

10. . . Projection plane

100. . . Laser marker

110. . . Laser source

120. . . Linear scan structure

122. . . Torsion piece

124. . . Scanning mirror

126. . . Grating stripe

B. . . Laser beam

C1～C3. . . Scanning beam

L1～L3. . . Line segment

S. . . Scanning line

Claims (12)

A linear scanning structure comprising: a torsion member; a scanning mirror connecting the torsion member, wherein the scanning mirror can reciprocally vibrate with the torsion member as a shaft at a predetermined angle; and a plurality of grating strips formed on the On the scanning mirror, a laser beam can be received, and the grating strips can further diffract the laser beam to generate a plurality of diffracted beams. The linear scanning structure of claim 1, wherein the diffracted beams respectively vibrate in a vibration direction of the scanning mirror to form a plurality of scanning beams. The linear scanning structure of claim 1, wherein the scanning mirror has a mirror surface, and the grating strips are formed on the mirror surface by a periodic concave-convex structure. The linear scanning structure of claim 1, wherein the scanning mirror has two mirror surfaces, and the two mirror surfaces are oppositely disposed, and the grating strips are respectively formed on the two mirror surfaces by a periodic concave and convex structure. on. The linear scanning structure of claim 2, wherein the scanning beams are projected onto a projection surface to generate a plurality of projection spots. The linear scanning structure of claim 1, wherein the diffracted beams are composed of a main reflected beam and at least a first order sub-reflected beam. A laser marker includes: at least one laser light source for emitting a laser beam; and a linear scanning structure comprising: a torsion member; a scanning mirror connecting the torsion member, the scanning mirror can be predetermined Reciprocating vibration is performed in the angle with the torsion member as an axis; and a plurality of grating strips are formed on the scanning mirror for receiving the laser beam, and the grating strips further circulate the laser beam A plurality of diffracted beams are generated. The laser marker of claim 7, wherein the diffracted beams respectively vibrate in a vibration direction of the scanning mirror to form a plurality of scanning beams. The laser marker of claim 7, wherein the scanning mirror has a mirror surface, and the grating strips are formed on the mirror surface by a periodic concave-convex structure. The laser marker according to claim 7, wherein the scanning mirror has two mirror surfaces, and the two mirror surfaces are oppositely disposed, and the grating strips are respectively formed on the two reflections by a periodic concave-convex structure. On the mirror. The laser marker of claim 8, wherein the scanning beams are projected onto a projection surface to generate a plurality of projection spots. The laser marker of claim 7, wherein the diffracted beams are composed of a main reflected beam and at least a first-order sub-reflected beam.