JP2001183969A - Light image projector using led - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED mark pointer which has high safety to the eyes and of which the projection mark is an easily visible color meeting the color of a projection surface and external light. SOLUTION: This device is successively arranged with an LED light source 1, a matrix mask 4 for marking having a cruciform slit and a light projecting lens 6. The marking matrix mask 4 is arranged within a region where the section of the light beam emitted from the LED light source 1 is nearly the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mark pointer (optical image projector) used for processing wood or plastic material, for example.

[0002]

2. Description of the Related Art It is well known that a mark pointer using a laser beam (commonly called a laser pointer) is conventionally used in describing a planetarium, a projection view, and the like. It is harmful and requires careful handling, and it may be difficult to see due to the color of the projection surface and external light.

[0003]

A first object of the present invention is to provide an LE which is highly safe for eyes.
To provide a mark pointer using D,
A second object is to provide an LED mark pointer whose projection mark is easy to see according to the color of the projection surface or external light.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first invention is to sequentially arrange an LED light source, a marking master mask and a light projecting lens, and An optical image projection apparatus using an LED, wherein a master mask is arranged in a region where the cross section of a light beam emitted from an LED light source is substantially the same.

According to this configuration, since the LED is used as the light source, the security is higher than that of the laser pointer. The mark is colored, and there are several types of LEDs having different emission colors. By selecting an LED, it is possible to provide a mark pointer suitable for the intended use, and it is possible to use LED light efficiently.

According to a second aspect of the present invention, an LED light source having a plurality of LEDs having different emission colors, an LED light source capable of lighting the LEDs individually or a plurality of LEDs at the same time, a marking master mask and a light projecting lens are sequentially arranged. LE for master mask
A light image projection device using LEDs, wherein the light beam emitted from the D light source is disposed in a region where cross sections of the light beams are substantially the same.

According to this configuration, in addition to the advantages and effects of the first invention, it is possible to provide a mark pointer using an LED of a color that cannot be obtained by the current LED manufacturing technology.

According to a third aspect of the present invention, in the first or second aspect, a convex lens for improving a light beam is provided between the LED light source and the marking master mask, preferably in proximity to the LED light source. An optical image projection device using LEDs,
By providing the convex lens for improving the light beam in this way, it is possible to use an LED having a large divergence angle of the light beam currently available on the market, and to lengthen the parallel portion of the light beam, that is, the portion having the same cross section of the light beam. Therefore, there is an advantage that the degree of freedom of setting the marking master mask is increased.

[0009]

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG.
An LED light source having an LED 2 having a divergence angle of 15 ° in mm, 4 is a marking master mask provided with a cross slit 5, and 6 is a light projecting lens movable in the optical axis direction.

The marking master mask 4 is arranged in a region L where the cross sections of the light beams emitted from the LEDs 2 are substantially the same.

The reason why the marking master mask 4 is arranged in this manner is that, as shown in FIG. 2, the light beam B emitted from the LED 2 spreads at an angle of about 15 ° when it exceeds the region L as shown in FIG. Since the light beam density is high if the light beam is provided in the region L, the light beam can be used efficiently and the reach distance can be increased.

A commercially available L having a diameter of 5 mm and a spread angle of 15 °
In the case of ED, the area L is about 20 mm, and the reach distance is 50 to 6
0cm mark used for wood and plastic processing
A pointer that can be practically used as a pointer was obtained.

There are currently commercially available LEDs having a light beam divergence angle of 45 ° and 30 ° in addition to the angle of 15 ° of the above-mentioned embodiment. These LEDs have a practicality as a mark pointer in the configuration of FIG. Absent.

FIG. 3 shows an L having a spread angle of 45 ° or 30 °.
This shows a configuration for improving the light beam of the ED to make the LED mark pointer practical. A convex lens 61 or 62 is provided on the light beam emission side of the LED 2 ′ or 2 ″ to parallelize the light beam due to spherical aberration. By forming portions (regions having substantially the same cross section), the LED mark pointer can be put to practical use.

FIG. 4 shows a case where an improving convex lens 63 having a large focal length is provided when an LED 2 having a spread angle of 15 ° is used. In this case, the parallel portion of the light beam can be made slightly longer.

FIG. 5 shows still another embodiment of the present invention. In this case, as the LED light source 11, two commercially available yellow LEDs 21 and green LEDs 22 are used, and power is supplied through switches 31 and 32, respectively. It is connected and emits a light beam through a dichroic mirror 7 and a right-angle prism 8.

When the switch 31 is turned on in this embodiment,
A yellow light beam is emitted from the LED light source 11 via the dichroic mirror 7, and a yellow cross mark is projected on the image plane by the cross slit 5 and the light projecting lens 6 of the mask 4.

When the switch 32 is turned on, the LED light source 11 is transmitted through the right-angle prism 8 and the dichroic mirror 7.
Emits a green light beam, and a green cross mark is projected on the image plane.

When both the switches 31 and 32 are turned on, the LED light source 11 emits a pseudo white beam which cannot be obtained with a commercially available LED. That is, according to this embodiment, not only a three-color LED light beam can be obtained, but also a pseudo-white mark pointer similar to a laser pointer can be provided.

In this embodiment, the mask 4 is provided in the region L as a matter of course.

[0021]

As described above, the mark pointer according to the present invention has a short reach of the projected image at present, but can select several kinds of colors, so that the mark pointer can be easily viewed according to the situation of the image plane. There is an effect that a pointer can be provided. According to the second invention, a pseudo white or mixed color mark which cannot be obtained with a commercially available LED at present.
According to the third aspect of the present invention, it is possible to realize a pointer, and according to the third aspect of the present invention, it is possible to use a commercially available mark pointer with all the LEDs.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an installation position of a marking master mask.

FIG. 3 is a diagram showing a method for improving a light beam of an LED.

FIG. 4 is a diagram showing a method for improving a light beam of an LED.

FIG. 5 is a configuration diagram of a different embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 LED light source 2, 21, 22 LED 3, 31, 32 switch 4 matrix mask for marking 5 cross slit 6 light emitting lens 7 dichroic lens 8 right angle prism

Claims (3)

[Claims] 1. An LED light source, a marking master mask and a light projecting lens are sequentially arranged, and the marking master mask is arranged in a region where a cross section of a light beam emitted from the LED light source is substantially the same. An optical image projection device using an LED. 2. A marking master mask comprising: a plurality of LEDs having different emission colors; an LED light source capable of lighting the LEDs individually or a plurality of LEDs simultaneously; a marking master mask and a projection lens; Wherein the light beam emitted from the LED light source is arranged in a region where the cross sections of the light beams are substantially the same. 3. The optical image projection device using LEDs according to claim 1, wherein a convex lens for improving a light beam is provided between the LED light source and the marking master mask.