JPH06175076A - Laser pointer - Google Patents

Abstract

PURPOSE:To provide a laser pointer which is easy to use and easy to view. CONSTITUTION:A variable angle prism 2 is arranged in front of a projecting lens 7. This prism 2 is obtained by sealing two plate glasses 2a and 2b at a bellows part 2c, and filling its inside with liquid 2d having high refractive index, and constituted so that the apex angles of both plate glasses can be relatively moved in horizontal and vertical directions. The driving in both directions is performed by a prism driving actuator 3, and the respective apex angles at that time are detected by a prism apex angle sensor 4, then information on the apex angles in the respective directions is transmitted to a microcomputer 6. 5 is a shake sensor attached to the inside of the case of the laser pointer so that the shake of the case in the horizontal and vertical directions may be detected, and it transmits information on the detected shake in the respective directions to the microcomputer 6 so as to calculate a correction driving amount for driving the glass plate so that the apex angle of the prism 2 may be changed, and control to drive the actuator 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser pointer for projecting a laser beam onto a screen or the like by hand-held operation and giving an instruction.

[0002]

2. Description of the Related Art In order to give instructions on a large screen at conferences, lectures, etc., there has been proposed a laser pointer which gives an instruction by using a laser beam by hand.

This laser pointer has a light projecting lens and a laser projecting means provided in a hand-held case.

[0004]

However, in the conventional laser pointer, since the laser pointer is hand-held by a hand and a laser beam is projected on a hanging drawing or a screen at a remote place, the hand is slightly shaken. However, there was a problem that it was very difficult to see because the projection point was greatly blurred and wobbled again.

Further, since the projection point is a "point", the pointing portion is narrow, and when pointing a wide range, the pointing location must be shaken, which is very difficult to see and is difficult to use.

The present invention solves these conventional problems,
It is an object to provide a laser pointer which is easy to use and easy to see.

[0007]

The structure for achieving the object of the present invention is as set forth in the appended claims. Specifically, a laser beam projected according to camera shake is changed by a variable apex angle prism. By refracting and compensating to reduce blurring at the projection point, by vibrating this variable apex angle prism, the projection point becomes a "line" or "oval", and it is possible to indicate a wide area at once. To do.

[0008]

1 shows a first laser pointer according to the present invention.
It is a schematic block diagram which shows an Example.

Reference numeral 1 is a laser projecting means, 7 is a projecting lens, and the laser projecting means 1 and the projecting lens are mounted in a hand-held case 11 as shown in FIG.

Reference numeral 2 denotes a prism having a variable apex angle (hereinafter referred to as a vari-angle prism), which is arranged in front of the light projecting lens 7. The vari-angle prism 2 is, as shown in FIG.
Two plate glasses 2a and 2b are sealed with a bellows part 2c and filled with a liquid 2d having a high refractive index. The plate glasses 2a and 2b are moved relative to each other in a horizontal direction and a vertical direction, which are two directions perpendicular to each other. The prism driving actuator 3 is configured to be capable of driving in both directions, each apex angle at that time is detected by the prism apex angle sensor 4, and the apex angle information in each direction is transmitted to the microcomputer 6.

Reference numeral 5 denotes a blur sensor which is mounted inside the case of the laser pointer and which detects angular movement of the case in two directions which are orthogonal to each other, that is, a horizontal direction and a vertical direction. Is transmitted to the microcomputer 6.

The microcomputer 6 calculates a correction drive amount for driving the glass plate to change the apex angle of the vari-angle prism 2 based on the blur information and the apex angle information, and drives the prism drive actuator 3. Take control.

The operation of the laser pointer of the present embodiment thus constructed will be described below with reference to FIGS. 2 to 4.

As shown in (1) of FIG. 2, when there is a camera shake at an angle θ, if the distance between the screen 10 and the laser pointer is l, the movement of the projection point on the surface of the screen 10 is l. Xθ, which increases as the distance 1 increases. Therefore, if the apex angle of the vari-angle prism is changed according to the camera shake angle and the optical path of the projected laser light is refracted, the influence of camera shake can be canceled as shown in (2) of FIG. it can.

That is, as shown in (1) of FIG. 3, when the plate glasses 2a and 2b of the vari-angle prism 2 are parallel to each other, the laser light passing through the vari-angle prism 2 travels straight, but in FIG. If the two plate glasses 2a and 2b are not parallel as in 2) and (3), the laser light passing through the vari-angle prism 2 is refracted. This is used to correct the change in the optical axis due to camera shake. If the refractive index of the prism liquid is n, and the vertex angle of the prism for canceling camera shake is ε, then θ = (n−1 ) Becomes ε.

Therefore, the apex angle ε for correction is calculated by the microcomputer 6 from the blur angle θ from the camera shake sensor 5, and the apex angle of the vari-angle prism 2 calculated and the apex from the prism apex angle sensor 4 are calculated. The prism drive actuator 3 is controlled so that the angle information becomes equal.

Note that this control is performed by detecting the camera shake in the horizontal direction and the camera shake in the vertical direction, respectively, and changing the vertical angle in the horizontal direction and the vertical direction, so that the change in the optical axis can be corrected two-dimensionally.

FIG. 5 is a schematic block diagram showing a second embodiment of the laser pointer according to the present invention.

The present embodiment utilizes the feature of the vari-angle prism 2 capable of varying the apex angles of the two orthogonal axes, that is, the beam emitted when the change angle is ε as shown in FIG. Is θ = (n-1) ε,
When the distance to the screen is l, the movement of the image point on the screen surface is l × θ. Then, when the two apex angles are changed so as to vibrate respectively, the vibrations are combined so as to obtain the projected states of various shapes. For example, as shown in (1) of FIG. When the vibration amplitude is set to 0 and only the horizontal direction is vibrated, a horizontal straight line corresponding to the amplitude of the vibration can be obtained. When both vibrations are driven in synchronization, as shown in (2) of FIG. It is possible to obtain an ellipse-shaped projection state, and it is possible to project a circle, a horizontally long ellipse, and a vertically long ellipse by changing the vibration amplitudes of both sides. You can also lean to.

It is the prism drive actuator 3 that gives the vari-angle prism 2 vibration in this way.
The projection state can be selected by the input means 8, and the microcomputer 6 drives a vibration generator including an oscillator, a phase shifter, a phase shifter and the like (not shown) according to an instruction from the input means 8 to drive the prism drive actuator 3. To do.

Needless to say, the second embodiment described above may have the functions of the first embodiment.

[0022]

As described above, according to the present invention,
Even if the hand holding the laser pointer is slightly blurred, for example, the blur at the projection point pointed by the laser pointer can be reduced, and the projection point pointed can also be a straight line or an ellipse, so that a wide range can be pointed at once. it can.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic view showing a usage state of the first embodiment.

FIG. 3 is a diagram for explaining the operation principle of the first embodiment.

FIG. 4 is a view showing a vari-angle prism of the first embodiment.

FIG. 5 is a schematic block diagram showing a second embodiment.

FIG. 6 is a diagram illustrating a usage state of the second embodiment.

FIG. 7 is a diagram for explaining the principle of the second embodiment.

[Explanation of symbols]

 1 Laser Projection Means 2 Vari Angle Prism 3 Prism Drive Actuator 4 Prism Vertical Angle Sensor 5 Blur Sensor 6 Microcomputer 7 Projection Lens 8 Input Means 10 Screen 11 Handheld Case

Claims (3)

[Claims] 1. A laser pointer that projects a laser beam through a lens and a laser projection unit and a projection lens provided in the case, and a blur detection unit that detects a blur of the case and a laser beam projector. Correction optical means for correcting the light direction, drive means for driving the correction optical means, and control for controlling the drive means so as to drive the correction optical means for correcting the blur amount detected by the blur detection means. A laser pointer having means. 2. A laser pointer in which a laser projecting means and a projecting lens are provided in a case, and a laser beam is projected through the projecting lens; an optical axis shifting optical means for shifting an optical axis of the laser beam; A laser pointer comprising drive means for driving the optical axis shift means and control means for controlling the drive means so as to drive the optical axis shift means by an external operation. 3. A laser pointer having the blur correction function according to claim 1 and the optical axis shift function according to claim 2, wherein the correction optical means also serves as the optical axis shift means. .