JP2581160Y2 - Laser pointer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a laser pointer, and more particularly to a laser pointer capable of projecting a curve such as a straight line or a circle using a piezoelectric bimorph as an actuator.

[0002]

2. Description of the Related Art The use of a laser pointer has been considered in order to condense laser light from a semiconductor laser by an optical system (lens) to form a light beam and project the light beam on a projection surface to display a predetermined position. I have. In general, a continuous light beam is projected on a projection surface such as a screen to display a spot at one point.

It has been considered to display a simple figure such as a line or a circle using the laser pointer. For that purpose, it is necessary to change the direction of the light beam to a predetermined direction and distance, and to repeat this in a short time.

As described above, in order to repeatedly change the direction of a light beam in a short time, a method of moving a reflection mirror is generally used. As means for changing the direction of the light beam by moving the reflection mirror, it is considered to use a small motor or the like. Further, in order to project a curve such as a circle, it is necessary to make the reflecting mirror movable in two axial directions. Therefore, miniaturization becomes difficult.

[0005]

The inventor proposed to use a piezoelectric bimorph as a means for making the reflecting mirror movable. As shown in FIG. 3, a thin metal piece having elasticity such as phosphor bronze is sandwiched between two piezoelectric ceramic plates, and one end is attached to the tip of a piezoelectric bimorph 31 fixed to a fixing base 30 via a mirror fixing base 32. The reflection mirror 33 is attached, and a vibration is generated by a voltage applied to the piezoelectric ceramic plate of the piezoelectric bimorph 31, thereby causing the reflection mirror 33 to vibrate together with the reflection mirror fixing base 32. Further, as shown in FIG. 2, a light beam generated by the laser light generator 24 is vibrated in directions different from each other by 90 ° by reflecting mirrors 23a and 23b attached to the piezoelectric bimorphs 21a and 21b to draw a circle. Is also considered.

However, in the above-described vibration structure, since the vibration of the reflection mirror is limited by the vibration of the piezoelectric bimorph, a sufficient vibration cannot be obtained. Therefore, when irradiating a straight line, a long straight line could not be obtained, and when drawing a circle, a circle having a large diameter could not be obtained.

The present invention solves such a problem and provides a laser pointer capable of realizing a long straight line and a large circle by obtaining a large amplitude of the reflection mirror.

[0008]

The present invention solves the above-mentioned problems by improving the mounting structure of the reflection mirror.

That is, in a laser pointer for condensing a laser beam by an optical system to form a light beam and irradiating the light beam on a projection surface to display a spot, a piezoelectric bimorph having piezoelectric ceramic plates adhered to both surfaces thereof is used. The tip of a metal piece that extends in the direction opposite to the support position of the piezoelectric bimorph with the shim is bent, and a reflection mirror that reflects the light beam is attached to the open side of the bent end, and the driving frequency of the piezoelectric bimorph is bent. The vibration of the metal piece is generated by driving the piezoelectric bimorph to match the frequency of the natural vibration of the metal piece, and the reflection angle of the light beam is made variable.

Further, in a laser pointer which focuses a laser beam by an optical system to form a light beam and irradiates the light beam onto a projection surface to display a spot, two laser ceramic plates each having a piezoelectric ceramic plate attached to both surfaces thereof are provided. The tip of a metal piece extending in the direction opposite to the support position of the piezoelectric bimorph integrally with the shim of the piezoelectric bimorph is bent, and a reflection mirror that reflects a light beam is attached to the open side of each bent end, and each piezoelectric bimorph is attached. The driving frequency of each of the bent metal pieces is matched to the frequency of the natural vibration, and the vibration of the two metal pieces is generated by driving each piezoelectric bimorph, and the reflection angle of the light beam is made variable. Have

[0011]

The reflecting mirror attached to the tip of the shim projecting from the piezoelectric bimorph via a bent metal piece vibrates not only with the vibration of the piezoelectric bimorph but also with the vibration of the bent metal piece. If the driving frequency of the piezoelectric bimorph is adjusted to the frequency at which the natural vibration of the metal piece occurs, the vibration of the reflection mirror attached to the metal piece can be increased.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a piezoelectric bimorph and a reflecting mirror used in a laser pointer according to the present invention. The piezoelectric bimorph 11 attached to the support 10 has a metal piece 14 on both sides of which a piezoelectric ceramic plate 16 is attached. Electrodes are formed on the surface of the piezoelectric ceramic plate 16, and wiring (not shown) is provided.

At the tip of the piezoelectric bimorph 11, a metal piece 14 is extended. The metal piece 14 is a thin plate made of an elastic metal material such as phosphor bronze and is formed integrally with the shim of the piezoelectric bimorph, and has a structure protruding from the piezoelectric bimorph. The tip of the metal piece 14 is bent, and the reflection mirror 13 is fixed to the bent portion 15.

The driving voltage applied to the piezoelectric bimorph 11 causes the piezoelectric ceramic 16 to bend, causing vertical vibration. This vibration is transmitted to the reflection mirror 13 via the metal piece 14 and causes the reflection mirror 13 to vibrate. At this time, a natural vibration also occurs in the metal piece 15 to which the reflection mirror 13 is attached. The amplitude can be increased by matching the frequency of the natural vibration with the driving frequency of the piezoelectric bimorph.

In FIG. 1, one piezoelectric bimorph has been described. However, two piezoelectric bimorphs arranged so as to have different vibration directions and two reflecting mirrors attached to a metal piece interlocked with the two bimorphs form a light beam. Can be reflected twice. A single piezoelectric bimorph can only display a straight line because it can only obtain vibration in one direction, but two-dimensional figures such as circles can be displayed by combining two pieces and making the directions of vibration differ by 90 °. .

[0017]

According to the present invention, since the vibration of the reflection mirror can be increased, it is possible to irradiate a long and large figure. Since a piezoelectric bimorph is used, a laser pointer with low power consumption can be obtained.

Further, since the amplitude can be increased, the size of the piezoelectric bimorph can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a laser pointer using a piezoelectric bimorph.

FIG. 3 is a front view of a main part of a conventional laser pointer.

[Explanation of symbols]

 11, 21, 31: Piezoelectric bimorph 14: Metal piece 15: Metal piece (bent part) 13, 23, 33: Reflection mirror

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-63912 (JP, A) JP-A-2-3099881 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 27/20 G02B 26/10 H02N 2/00

Claims (3)

(57) [Scope of request for utility model registration] 1. A laser pointer which focuses a laser beam by an optical system to form a light beam and irradiates the light beam onto a projection surface to display a spot. The tip of a metal piece that extends in the direction opposite to the support position of the piezoelectric bimorph with the shim is bent, and a reflection mirror that reflects the light beam is attached to the open side of the bent end, and the driving frequency of the piezoelectric bimorph is bent. A laser pointer characterized in that the vibration of the metal piece is generated by driving the piezoelectric bimorph to match the frequency of the natural vibration of the metal piece, thereby making the reflection angle of the light beam variable. 2. A laser pointer for converging laser light by an optical system to form a light beam, and irradiating the light beam to a projection surface to perform spot display, wherein two piezoelectric ceramic plates are adhered to both surfaces of the laser pointer. The tip of a metal piece extending in the direction opposite to the support position of the piezoelectric bimorph integrally with the shim of the piezoelectric bimorph is bent, and a reflection mirror that reflects a light beam is attached to the open side of each bent end, and each piezoelectric bimorph is attached. The driving frequency of each of the bent metal pieces is matched to the frequency of the natural vibration, and the vibration of the two metal pieces is generated by driving each piezoelectric bimorph, making the reflection angle of the light beam variable. Laser pointer. 3. The vibration direction of two piezoelectric bimorphs is 90 °.
The laser pointer according to claim 2, which is different.