JP3096140B2 - Pointing point indicating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring point indicating device for roughly grasping a collimating direction of a surveying instrument from a collimation target side.

[0002]

2. Description of the Related Art As one conventional point indicating device, as shown in FIG. 3, light transmitting plates of different colors are provided at a focal position of an optical axis of a collimator lens.
The light source is provided on the rear surface of the light transmitting plate. If the light source is primary light on the target side, secondary light diffused from the light transmitting plate is observed. In FIG. 3, for example, if the right side of the optical axis of the light-transmitting plate is green and the left side is red, when observing it from the target side, the light from the collimator lens is different on the left and right sides of the optical axis. Both colors can be observed mixed. That is, red is observed on the right side of the optical axis of the point indicating device, green is observed on the left side, and both colors are observed near the optical axis.

In such an apparatus, the light source can be seen with a certain width in the vicinity of the optical axis, so that it is easy to distinguish. However, secondary light transmitted through a light-transmitting plate is used instead of directly observing the light from the light source. Therefore, there is a problem that a considerably strong light source is required for observation at a long distance. In addition, there is a problem that it is difficult to distinguish the color of the secondary light by the light transmitting plate from the color of the background color at a long distance.

On the other hand, in another conventional embodiment disclosed in Japanese Utility Model Application No. 60-101669 (see FIG. 4),
There is an advantage that it is easy to use at a long distance because primary light is used instead of secondary light by a light transmitting plate. However, there is no portion where the light beams overlap as is apparent from FIG. Therefore, in this apparatus, the positions are distinguished on the optical axis as a boundary, but there is a risk that the boundary may be lost if the position is slightly shifted at the time of setting a point.

Therefore, the present invention uses the primary light of the light source directly without using a light-transmitting plate, makes it possible to easily determine even a weak light source from a long distance, and to lose the boundary near the optical axis. It is an object of the present invention to provide a measuring and pointing device.

[0006]

A point indicating device according to the present invention comprises at least two collimator lenses whose optical axes are parallel to each other, and is arranged on the optical axis of the collimator lens and emits a visible light beam. One light source and two light shielding plates at the focal position on the light source side of the collimator lens for shielding light beams, and each of the light shielding plates is arranged at a position for shielding light beams inward from two optical axes. It is characterized by having been done.

It is preferable that the two light sources blink at different periods. Further, it is preferable that the colors of the visible light emitted from the two light sources are different from each other.

[0008]

According to the present invention, the collimating direction of the surveying instrument and the point indicating device are mounted in parallel, the light source is made to emit light, and observation is performed from the target side, so that the light beam can be visually recognized when it is off the optical axis. If the optical axis is between the optical axes of the collimator lens, the light beam from the collimator lens is not visible at all.

Therefore, according to the present invention, since the primary light from the light source condensed by the collimator lens is directly observed, it can be easily confirmed even at a long distance. Therefore, a strong light source is not required and power consumption is reduced. Further, by making the phase of the periodic blinking and the phase of the blinking different, or by making the emission color of the light source different, the color of the background can be more easily distinguished even at a long distance. The shift direction in the direction connecting the optical axes of the system can be known.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment. FIG. 1 is an explanatory diagram showing the principle of a measuring and pointing device according to the present invention. In this figure, a measuring and pointing device according to the present invention comprises at least two collimator lenses 3, 4 whose optical axes 1, 2 are parallel to each other, and the collimator lenses 3, 4
And two light sources 7 and 8 for emitting visible light beams 5 and 6 on the optical axes 1 and 2 of the collimator lenses 3 and 4, respectively, for shielding the light beams 5 and 6 at the light source side focal positions 9 and 10. Drive circuit 2 for turning on and off the light sources 7 and 8
0.

Each of the light shielding plates 11 and 12 has two optical axes 1 and 2.
It is provided so as to block the light flux going outward from the position 2. The left and right light sources 7, 8 are preferably semiconductor light emitting elements. As shown in FIG. 2, the light sources 7 and 8 have (A) the period of the light source 7 longer than the period of the light source 8, or (B) the period of the light source 7 and the period of the light source 8 are equal and the phases are shifted by 180 °. .

When the light sources 7 and 8 of the semiconductor light emitting element emit light, the light beams 5 and 6 from the light sources 7 and 8 are half-shielded by the light shielding plates 9 and 10. The half-shielded light beams 5 and 6 are once condensed by the collimator lenses 3 and 4 and then emitted.
The projected light beam can be distinguished into three regions 13, 14 and 15. In the regions 14 and 15 outside the parallel optical axes 1 and 2,
Either of the light sources 7 and 8 is periodically blinked. In the common area 13 located between the parallel optical axes 1 and 2, the light beams from both light sources 7 and 8 cannot be visually recognized. From such a visual recognition state, it is possible to know whether it is between or outside the optical axis of the collimator optical system, and further, it is determined whether the optical axis of the collimator optical system is shifted to the right or left. can do.

Further, the colors of the visible light beams 5, 6 emitted from the two light sources 7, 8 are preferably different from each other. In this case, the confirmation is further facilitated by the combination of the blinking and the color.

[0014]

According to the configuration of the present invention described above, since the primary light from the light source condensed by the collimator lens is directly observed, it can be easily confirmed even at a long distance. Therefore,
Power consumption is reduced because a strong light source is not required. In addition, by making the phase of the periodic blinking and the phase of the blinking different, or by making the light emission color of the light source different, it becomes easier to discriminate the color from the background at a long distance, and to confirm it easily. In addition, since at least one of the light sources can be directly confirmed near the optical axis, the boundary is not lost near the optical axis.
It has many effects.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the principle of a measuring and pointing device according to the present invention.

FIG. 2 is an explanatory diagram showing a flicker cycle of a semiconductor light emitting element.

FIG. 3 is an explanatory diagram of a conventional point indicating device.

FIG. 4 is an explanatory diagram of another conventional point indicating device.

[Explanation of symbols]

 1, 2 Optical axis 3, 4 Collimator lens 5, 6 Light flux 7, 8 Light source 9, 10 Focus 11, 12 Shield plate 13, 14, 15 Area

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01C 15/00-15/14

Claims (3)

(57) [Claims] At least two collimator lenses whose optical axes are parallel to each other, two light sources arranged on the optical axis of the collimator lens for emitting a visible light beam, and a focal position of the collimator lens on the light source side Wherein the light-shielding plate is disposed at a position where the light-shielding plate blocks the light beam directed inward from the two optical axes. 2. The point indicating apparatus according to claim 1, wherein the two light sources blink at different periods. 3. The point indicating apparatus according to claim 1, wherein the colors of the visible light beams emitted from the two light sources are different from each other.