JPH0678924U - Laser pointer - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a laser pointer that can display a straight line with a simple structure. [Structure] A mirror having a convex curvature on the reflection surface side is used as a reflection mirror of a laser beam. The beam reflected by the reflecting mirror spreads in a direction having a curvature, whereby the beam which is a point is displayed as a straight line. If a means for swinging the reflecting mirror by a piezoelectric bimorph or the like is also used, a longer straight line or the like can be displayed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a laser pointer, and more particularly to a laser pointer capable of projecting a straight line or the like by using a reflection mirror.

[0002]

[Prior art]

 Use of a laser pointer has been considered in order to focus laser light from a semiconductor laser by an optical system (lens) to form a light beam, which is projected on a projection surface to display a predetermined position. In general, a continuous light beam is projected onto a projection surface such as a screen to spot-display one point. FIG. 3 is an explanatory view showing an example of such a laser pointer, in which the laser light of the semiconductor laser 31 is condensed by a lens 32, reflected by a reflection mirror 33, 34 in a predetermined direction and irradiated. .

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

[0004]

[Problems to be solved by the device]

 As described above, the method of moving the reflecting mirror is generally used in order to repeatedly change the direction of the light beam in a short time. That is, the reflecting mirror has a movable structure, and the reflecting mirror is repeatedly moved.

Although a small motor or the like is used to move the reflecting mirror, a driving circuit and a power source are required, and it is difficult to obtain a small-sized laser pointer with low power consumption.

The present invention solves such a problem, and provides a drive mechanism which can be easily downsized and consumes less power.

[0007]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems by providing a reflecting surface of a reflecting mirror with a curvature to lengthen the reflecting direction.

That is, a laser pointer that collects laser light by an optical system to form a light beam and projects the light beam on a projection surface to perform spot display includes a reflection mirror that reflects the light beam, and reflects the light beam. At least one of the mirrors is characterized by having a curvature so that the reflecting surface side is convex.

In addition, a laser pointer that collects laser light by an optical system to form a light beam, and projects the light beam on a projection surface to display a spot includes a reflection mirror that reflects the light beam. At least one of the reflection mirrors has a curvature so that the reflection surface side is convex, and the reflection mirror or another reflection mirror is rotatably supported, and the piezoelectric bimorph is connected to the support and is rotated by bending the piezoelectric bimorph. It is characterized in that the reflection mirror supported so that it can be rotated repeatedly at a predetermined angle.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view showing an essential part of an embodiment of a laser pointer according to the present invention. The laser pointer 10 includes a power source 16 and an electronic circuit 17 in a housing, and a semiconductor laser 11 for generating a laser beam.

An optical system (lens) 12 for condensing the laser light generated by the semiconductor laser 11 and a reflection mirror 13 and a reflection mirror 14 for directing the same in a predetermined direction are provided. Both the reflection mirror 13 and the reflection mirror 14 are fixed to the housing, but the reflection mirror 14 has a curvature so that the reflection surface side is convex. That is, it is composed of a convex mirror.

The light beam made into a parallel beam having a constant width and length by the lens is reflected by the above convex mirror, so that a straight line having an increased length is irradiated. It reflects the light beam so that it is incident at an angle of 46 ° to the tangent of the curved surface. The angle of reflection is 46 °, and the irradiation beam is lengthened by 1 °, but a line with an extended length of 52 mm is drawn 3 m ahead.

FIG. 2 is a front sectional view showing another embodiment of the present invention, which is the same as the above example in that the semiconductor laser 21, the lens 22, the reflecting mirror 23, and the reflecting mirror 24 are provided. In this example, the reflection mirror 24 is rotatably supported, and the support portion of the reflection mirror 24 is connected to the piezoelectric bimorph 25. In this piezoelectric bimorph, piezoelectric ceramic plates are attached to both sides of a metal plate, and electrodes are formed on the surface of the piezoelectric ceramic plate and connected to a power source.

The vibration generated in the piezoelectric ceramic plate by the voltage applied to the piezoelectric bimorph 25 is transmitted to the supporting portion of the reflection mirror 24 by the metal plate, and is moved up and down. This vertical movement is converted into rotational movement about the axis, and the reflection mirror 24 also swings at a predetermined angle (range) accordingly. A reciprocating motion with a period corresponding to the frequency of the vibration generated in the piezoelectric ceramic plate is generated. In this example, it is easy to display a straight line from the point light source.

The movement of the reflection mirror 24 and the action of its curvature make it possible to form a longer straight line. Since the reflecting mirror has a curved surface, it is possible to draw a long straight line even if the piezoelectric bimorph has a small amplitude.

The present invention is not limited to the above example, but it is also possible to give a plurality of reflecting mirrors a curvature or change the bending direction. Further, the reflecting mirror that is moved by using the piezoelectric bimorph may be flat. It is also possible to move the beam in two axial directions by using multiple piezoelectric bimorphs. At this time, by combining with a convex mirror, it becomes easy to enlarge the figure.

[0018]

[Effect of device]

 It is possible to obtain a small and lightweight laser pointer that can display figures such as straight lines with a simple structure. Moreover, since the piezoelectric actuator is used for the movement of the reflecting mirror, a laser pointer with low power consumption can be obtained.

Furthermore, by changing the curvature of the reflection mirror, it is possible to switch and display different lengths.

[Brief description of drawings]

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

FIG. 2 is a front sectional view of a main part showing another embodiment of the present invention.

FIG. 3 is a front sectional view showing a conventional laser pointer.

[Explanation of symbols]

 13, 14, 23, 24: Reflecting mirror 25: Piezoelectric bimorph

Claims (2)

[Scope of utility model registration request] 1. A laser pointer for concentrating laser light by an optical system to form a light beam, and projecting the light beam onto a projection surface to provide a spot display, comprising a reflection mirror for reflecting the light beam. A laser pointer, wherein at least one of the mirrors has a curvature such that the reflection surface side is convex. 2. A laser pointer for concentrating laser light by an optical system to form a light beam, and projecting the light beam onto a projection surface to provide a spot display, comprising a reflection mirror for reflecting the light beam, and reflecting the light beam. At least one of the mirrors has a curvature so that the reflection surface side is convex, and the reflection mirror or another reflection mirror is rotatably supported, and a piezoelectric bimorph is connected to the support, and the piezoelectric bimorph can be rotated by bending. A laser pointer characterized by repeatedly rotating a reflection mirror supported by a mirror at a predetermined angle.