JP2000284220A - Laser pointer with hand-shake prevention and hand- shake preventing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser pointer with hand-shake prevention which can make a two-dimensional display by providing a correcting circuit, etc., which corrects the movement of the movable plate of a two-axial planar type electromagnetic actuator according to the output signal of an angular velocity sensor. SOLUTION: A semiconductor laser 2 is fixed to a housing 1 and the light emitted by the semiconductor laser 2 is collimated by a collimator lens system 3 into parallel light 101. This parallel light 101 is reflected by a mirror formed on the planar type electromagnetic actuator 7 in two-axis structure. Then angular velocity sensor 8 is arranged in the projection direction of the reflected laser light 102 to detect the angular velocities of two axes orthogonal to the reflected laser light 102. According to the detected angular velocities of the two axes, a control circuit for movable plate performs correction by a hand- shape quantity. Then a current is supplied to a plane coil provided on the top surface of the movable plate of the actuator 7 to control the tilt of the movable plate and then the projection direction of the reflected laser light is corrected to eliminate the movement of the laser pointer due to a hand shake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser pointer having a camera shake prevention function using a laser pointer which indicates a distant specific place with a two-dimensionally displayed light spot, and a camera shake prevention method.

[0002]

2. Description of the Related Art In a lecture or the like, in order to point out a specific place such as a drawing on a screen from a lecture position, it is necessary to use a long pointing rod because the drawing is enlarged and projected.
However, even with the stick, the lecturer had to move on the stage, which sometimes hindered the lecture from the viewpoint of the audience.
For this reason, a laser pointer, which is used by a speaker to project a light spot on a screen and point to it, has come to be used. Since the light is projected at hand, the speaker does not need to approach the screen, and using a red laser as a light source has an advantage that the visibility of the audience is high because the brightness of the light is high.

FIG. 1 shows a configuration of a conventional laser pointer. In FIG. 1, a housing 1 includes a semiconductor laser 2 fixed to the housing, collimated light emitted from the semiconductor laser 2, a collimating lens system 3 for determining a projection optical path, a power supply circuit 4, a battery box 5, and a power switch. Six are stored.

In the case of this example, if the spatial arrangement of the laser pointer changes except for the degree of freedom for translation with the optical path, the optical path changes, so that the projected light spot naturally moves. When using the actual laser pointer, it is not necessary to move the light point because the pointing position is arbitrary, but the spatial position of the housing fluctuates due to hand shake etc. Similarly, the light spot moved.

When a laser pointer is used, when a stranger or a speaker is nervous, a slight shake at hand is enlarged and projected in proportion to the distance to the screen. Keep moving constantly,
There was a problem that it was very difficult to see.

In order to suppress the camera shake, the frequency of the camera shake may be reduced by making the laser pointer itself heavy. However, in this case, there is a problem that the speaker becomes tired and the operability deteriorates.

[0007] Further, when the projected light spot is enlarged, the shake appears to be relatively small, but the brightness of the light is reduced, so that there is a problem that the visibility is reduced.

As a technique for solving the above-mentioned problem, Japanese Patent Application Laid-Open No. Hei 7-239660 discloses a technique for preventing camera shake of a light spot projector using an angular velocity sensor. A semiconductor laser, an optical system for converting laser light from the semiconductor laser into parallel light, a movable mirror inserted into a part of the optical system, and detecting an angular velocity of two axes orthogonal to a projection direction of the laser light. A light spot projector including an angular velocity sensor and a control circuit for controlling rotation of a movable mirror based on an output signal of the angular velocity sensor in one housing.

This is a laser pointer that displays dots. It has a structure in which laser light is reflected by a dish-rotating electrostatic movable mirror that can rotate around a pivot, and the camera shake is corrected by moving the movable mirror based on an output signal of an angular velocity sensor.

[0010] With a laser pointer of dot display, it is possible to prevent camera shake by the above-mentioned technology. However, recently, a laser pointer capable of two-dimensional display with a laser pointer is desired. Line display, circle display, arrow display, and other two-dimensional display are possible. Something that can be displayed has been developed. FIG. 2 is an inside view of a laser pointer capable of displaying lines and circles. The case 12 of the laser pointer 11 has a lens, a laser light source 13, a laser light source driving circuit / oscillation circuit 14, a switch (not shown), a battery 6, and two mirrors 15A and 15B that reflect the laser light and each mirror vibrates. The diaphragm / mirror holding plates 16A, 16B to be accommodated are housed, and the piezoelectric vibrators 17A, 17B are attached to the diaphragms 16A, 16B.

The laser light emitted from the laser light source 13 is reflected by two mirrors and emitted from the opening 12B. If the mirror is not vibrated, dot display will be displayed.
This is a laser pointer structure in which line display can be performed by vibrating two mirrors and circle display can be performed by simultaneously vibrating two mirrors. Elliptical display is also possible by changing the vibration width of the two mirrors.

FIG. 3 is a schematic diagram of a conventional two-axis laser pointer using two one-axis galvanometer mirrors. This is a laser pointer disclosed in JP-A-10-253924, which uses two galvanometer mirrors and is capable of two-dimensional display. Galvo mirror 22 and galvo mirror 2
The laser light source 21, the galvanometer mirror 22, and the galvanometer mirror 23 are arranged so that the laser light beam 26 emitted from the laser light source is located on the mirror surface of the galvanometer mirror 22. The light is reflected at substantially the center, and the reflected light is applied to the galvanomirror 2
3 and are fixed to the case 20 respectively. An electronic circuit including two alternating pulse current generators for supplying the two galvanomirrors 22 and 23 is formed on the substrate 24. 2
5 is a battery for power supply.

If the oscillation phases of the two galvanometer mirrors 22 and 23 are matched by adding a phase detector and a control circuit, a figure such as an oblique line or a sawtooth wave can be drawn. If a laser beam is turned on and off in synchronization with the phase while scanning at a constant fine interval, an arbitrary figure can be displayed similarly to a CRT. FIG. 3 shows a conventional one-axis galvanometer mirror. FIG. 2 is a schematic diagram of a two-axis laser pointer using two laser pointers. This is a laser pointer disclosed in JP-A-10-253924, which uses two galvanometer mirrors and is capable of two-dimensional display. Galvo mirror 22 and galvo mirror 2
The laser light source 21, the galvanometer mirror 22, and the galvanometer mirror 23 are arranged such that the laser light beam 26 emitted from the laser light source is on the mirror surface of the galvanometer mirror 22. The light is reflected at substantially the center, and the reflected light is applied to the galvanomirror 2
3 and are fixed to the case 20 respectively. An electronic circuit including two alternating pulse current generators for supplying the two galvanomirrors 22 and 23 is formed on the substrate 24. 2
5 is a battery for power supply.

If the oscillation phases of the two galvanometer mirrors 22 and 23 are matched by adding a phase detector and a control circuit, it is possible to draw a figure such as an oblique line or a sawtooth wave. If the laser light beam is turned on and off in synchronization with the phase while scanning at a constant fine interval, an arbitrary figure can be displayed similarly to the CRT.

[0015]

Since the laser pointer according to the prior art shown in FIG. 2 displays a line and a circle by vibrating a mirror, the display can be adjusted only by adjusting the amplitude, and the length of the line can be adjusted. You can only adjust the size of the circle and the size of the circle, you can not correct the camera shake.

The laser pointer according to the prior art shown in FIG. 3 is two-dimensionally displayed by two galvanometer mirrors, so that camera shake can be theoretically prevented.
There has not yet been proposed a laser pointer with camera shake prevention and a specific method of camera shake prevention. Further, a laser pointer using two galvanometer mirrors has the disadvantage that the whole becomes large, and the position adjustment between the galvanometer mirrors and the adjustment of the galvanometer mirror drive circuit are complicated. An object of the present invention is to provide a laser pointer with camera shake prevention capable of two-dimensional display that solves these problems.

[0017]

SUMMARY OF THE INVENTION A semiconductor laser, an optical system for converting laser light from the semiconductor laser into parallel light, a biaxial planar electromagnetic actuator inserted into a part of the optical system, A circuit for controlling the movement of a movable plate of a planar-type electromagnetic actuator having a two-axis structure; an angular velocity sensor for detecting an angular velocity of two axes orthogonal to a projection direction of laser light;
A correction circuit that corrects the movement of the movable plate of the axis planar type electromagnetic actuator is provided as a laser pointer with camera shake prevention provided in one housing.

The planar-type electromagnetic actuator having a two-axis structure has two movable plates disposed inside and outside, and a planar coil is provided on an upper surface of the movable plate, and each of the two plates has orthogonal two-axis beams. And a mirror is formed on the inner movable plate. By passing a current through the planar coil, the movable plate tilts about the beam.

In a method for preventing a camera pointer from shaking, a laser beam from a semiconductor laser is reflected by a planar-type electromagnetic actuator having a two-axis structure and two-dimensionally displayed. The camera shake is corrected by correcting the movement of the movable plate or correcting the camera shake by correcting the semiconductor laser drive control timing based on the output signal of the two-axis angular velocity sensor.

[0020]

4A and 4B show a planar type electromagnetic actuator having a biaxial structure used in the present invention. FIG. 4A is a top view and FIG. 4B is a side sectional view. FIG. 5 is a perspective view for explaining a planar-type electromagnetic actuator having a biaxial structure.

The planar type electromagnetic actuator 30 having a biaxial structure is a semiconductor element 4 on which a total reflection mirror 45 is formed.
0, substrate 50, pedestal 60, permanent magnet 70, yoke 80,
The stem 90 is formed. The plurality of stems 90 are for supplying a drive signal to the semiconductor element 40,
The electrode patterns 46A, 46B formed on the semiconductor element,
47A, 47B and the upper end of the stem 90 are connected by a wire.

In the planar-type electromagnetic actuator 30 having a biaxial structure, two permanent magnets 80 are arranged diagonally outside the semiconductor element 40 made of a silicon substrate. In the semiconductor element 40, a thin film coil 44 for driving the inner movable plate 41 is formed in a frame shape on the inner movable plate 41 so as to surround the total reflection mirror 45. The inner movable plate 41 and the outer movable plate 42 are beams 41 integrally formed with the silicon substrate 40.
A, 41B. The outer movable plate 42 is connected to the frame portion of the silicon substrate 40 by beams 42A and 42B.
On the other hand, on the upper surface of the outer movable plate 42, a thin-film coil 43 for driving the outer movable plate 42 is formed.

When a current is applied to the driving thin-film coil 43 formed on the outer movable plate 42, the outer movable plate 42 rotates in accordance with the current direction with the first beams 42A and 42B as fulcrums. At this time, the inner movable plate 41 also rotates integrally with the outer movable plate 42. On the other hand, when a current is applied to the driving thin film coil 44 formed on the upper surface of the inner movable plate 41, the inner movable plate 41 rotates around the second beams 41A and 41B as a fulcrum. An electric current is applied to the outer movable plate 42 driving thin film coil 43 and the inner movable plate 4
If a current is also applied to the driving thin film coil 44, the outer movable plate 4
The inner movable plate 41 rotates in a direction perpendicular to the direction of rotation of the second movable plate 41. In this case, two-dimensional scanning can be performed by deflecting and scanning the laser light with the total reflection mirror 45. The windows 48A, 48B, 49A, 49B are etched around the movable plate.
Are formed, and the movable plates are beams 41A, 41B, 42.
A, 42B only.

FIG. 6 is a structural view of a laser pointer according to the present invention, wherein 1 is a housing, 2 is a semiconductor laser, 3 is a collimating lens system, 7 is a planar type electromagnetic actuator having a biaxial structure, 8 is an angular velocity sensor, 9 is a control circuit, 4 is a power supply circuit, 5 is a battery box, 6 is a power switch, 10
Is a battery.

The semiconductor laser 2 is fixed to the housing 1, and the emitted light from the semiconductor laser 2 is converted into a parallel light 101 by a collimating lens system 3, and the parallel light 101 is transmitted to a planar-type electromagnetic actuator 7 having a biaxial structure. It is reflected by the formed mirror. The angular velocity sensor 8 is arranged in the projection direction of the reflected laser light 102, and detects the angular velocity of two axes orthogonal to the reflected laser light 102.

FIG. 7 is a circuit block diagram for preventing camera shake according to the present invention. The control circuit 9 includes a control circuit 9A for driving the thin film coil 44 for driving the inner movable plate 41, a control circuit 9B for driving the thin film coil 43 for driving the outer movable plate 42, and a control circuit 9C for the power supply 4 of the semiconductor laser. 4 is connected. The control circuit 9 is connected to the graphic memory 103. Output signals from the two-axis angular velocity sensor are also connected to the control circuit 9.

When the laser point is displayed and camera shake is prevented, the control circuit 9A, 9B for the movable plate corrects the camera shake based on the detected angular velocity of the two axes, and the movable plate of the planar electromagnetic actuator 7 is corrected. It is possible to control the tilt of the movable plate by passing current through the planar coils 44 and 43 provided on the upper surface, and correct the projection direction of the reflected laser light, thereby eliminating the movement of the laser point due to camera shake.

When a graphic is displayed by a laser, it is provided on the upper surface of the movable plate of the planar electromagnetic actuator 7 by control circuits 9A and 9B in accordance with current signals for several types of graphics previously stored in the graphic memory 103. The inclination of the movable plate is controlled by passing a current through the planar coil, and a graphic display is performed by two-dimensional scanning of the reflected laser beam 102. In addition, when a camera shake prevention function is added, a current signal for camera shake control is corrected in the control circuits 9A and 9B with respect to a current signal for a figure based on the two-axis angular velocity detected by the angular velocity sensor 8. The operation of the movable plate is controlled by applying a correction current to a planar coil provided on the upper surface of the movable plate of the planar type electromagnetic actuator 7 so that graphic display is performed by two-dimensional reflected laser beam scanning and projection is performed. It is possible to correct the direction.

Another method for preventing camera shake according to the present invention is as follows.
This method corrects the emission timing of the semiconductor laser light without correcting the movement of the movable plate of the planar type electromagnetic actuator having the shaft structure. The power control circuit 9C is controlled by the output signal of the two-axis angular velocity sensor, and the timing of the emission of the laser beam is corrected to prevent camera shake.

In either method, in the case of two-dimensional display, a figure is fetched into a memory (not shown) for each screen, and
Although it is necessary to display the image after correcting the camera shake, since the method of correction is a conventional means, the description is omitted.

[0031]

According to the present invention, since the above-described configuration is employed, a clear laser point instruction and a laser graphic display with no movement of the light spot due to camera shake can be realized by one laser pointer. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional laser pointer.

Fig. 2 Inside view of a laser pointer that can display lines and circles

FIG. 3 is a schematic view of a conventional two-axis laser pointer using two one-axis galvanometer mirrors;

FIG. 4 is a plan view type electromagnetic actuator having a biaxial structure used in the present invention, wherein (A) is a top view and (B) is a side sectional view.

FIG. 5 is a perspective view illustrating a planar-type electromagnetic actuator having a two-axis structure.

FIG. 6 is a configuration diagram of a laser pointer according to the present invention.

FIG. 7 is a circuit block diagram of camera shake prevention according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 housing 2 semiconductor laser 3 collimating lens system 4 power supply circuit 5 battery box 6 power switch 7 two-axis planar electromagnetic actuator 8 angular velocity sensor 9 control circuit 9A thin-film coil control circuit 9B thin-film coil control circuit 9C power control circuit 10 battery Reference Signs List 11 laser pointer 12 case 12B opening 13 lens and laser light source 14 laser light source drive circuit / oscillation circuit 15A mirror 15B mirror 16A diaphragm 16B diaphragm 17A piezoelectric vibrator 17B piezoelectric vibrator 20 case 21 laser light source 22 galvanomirror 23 galvanomirror Reference Signs List 24 substrate 25 battery 26 laser beam 30 biplanar electromagnetic actuator 40 semiconductor element 41 inner movable plate 41A beam 41B beam 42 outer movable plate 42A beam 42B beam 43 Thin film coil 44 Thin film coil 45 Total reflection mirror 46A Electrode pattern 46B Electrode pattern 47A Electrode pattern 47B Electrode pattern 48A Window 48B Window 49A Window 49B Window 50 Substrate 60 Pedestal 70 Permanent magnet 80 Yoke 90 Stem 101 Parallel light 102 Reflected laser beam 103 Graphic memory

Claims (3)

[Claims] 1. A semiconductor laser, an optical system that converts laser light from the semiconductor laser into parallel light, a biaxial planar electromagnetic actuator inserted into a part of the optical system, A circuit for controlling the movement of the movable plate of the planar electromagnetic actuator, an angular velocity sensor for detecting the angular velocity of the two axes orthogonal to the projection direction of the laser light, and the movement of the two-axis planar electromagnetic actuator based on the output signal of the angular velocity sensor A laser pointer with camera shake prevention, wherein a correction circuit for correcting the movement of the plate is provided in one housing. 2. A laser beam from a semiconductor laser,
In a method for preventing camera shake of a laser pointer with a camera shake which is reflected by a planar type electromagnetic actuator having a two-dimensional structure and is displayed in two dimensions, the movable plate control of the two-axis planar electromagnetic actuator is corrected by an output signal of a two-axis angular velocity sensor to reduce the camera shake. A camera shake prevention method for a laser pointer with a camera shake prevention, wherein the correction is performed. 3. A laser beam from a semiconductor laser,
In a method for preventing camera shake of a laser pointer having a camera shake which is reflected by a planar type electromagnetic actuator having a two-dimensional structure, the semiconductor laser drive control timing is corrected by an output signal of a two-axis angular velocity sensor to correct the camera shake. The method of preventing camera shake of a laser pointer with camera shake prevention.