JPH0714934Y2 - Reflector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reflecting device that reflects light, and more particularly to a reflecting device that is used in a light wave rangefinder and that reflects light that has entered the reflecting device in the same direction as the incident direction. Is.

[Prior Art] Conventionally, an optical distance meter has been used to measure a certain distance. This lightwave rangefinder emits light such as infrared modulated light,
The distance to the measurement point is measured by reflecting the light with a reflecting device installed at the measurement point and measuring the time until the light is emitted and returned. A corner prism for reflecting light is attached to the reflecting device. This prism has a shape in which three edges are cut into equal lengths with one corner of the cube as the center,
It has the property that the incident ray returns in the same direction as the incident direction. By the way, in this kind of optical rangefinder, it is necessary to correctly direct the light to the reflecting device. Therefore, a collimation telescope is provided in the optical distance meter, and the collimation telescope collimates the center position of the reflecting device to direct light to the reflecting device.

However, in the conventional reflection device, for example, at the time of emitting light toward the reflection device when measuring at night, in a dark environment such as in a tunnel, or when measuring a long distance,
There is a problem that the center of the corner prism of the reflector cannot be collimated correctly.

[Purpose] Therefore, an object of the present invention is to provide a reflecting device that can easily collimate the center of a corner prism of the reflecting device even when surveying in a dark environment or surveying a long distance. .

[Structure] The present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of the present invention.

In the figure, reference numeral 1 is a reflecting device for reflecting light. The reflection device 1 includes a corner prism 2, a holding member 3 that holds the corner prism 2, and a lighting device 4 fixed to the holding member 3.
It consists of and.

The corner prism 2 is made of transparent optical glass. The corner prism 2 has a substantially triangular pyramid shape in which three edges are cut into equal lengths with one corner of a cube as shown in FIG.
Two reflecting surfaces 2b are formed, where 2a and the ridge line form a right angle with each other. Further, the chamfered vertex A formed by the three reflecting surfaces 2b is appropriately polished so as to be parallel to the incident / transmitting transmitting plane 2a to form a transmitting surface 2c.
The light from the lighting device 4 is transmitted through the transparent surface 2c. In this case, in this embodiment, the transmissive surface 2c is formed with the apex A of the corner prism 2 as a flat surface. However, the present invention is not limited to this example. It is also possible to provide a surface parallel to 2a. The reflecting surface 2b is configured to reflect the light incident from the optical distance meter three times on the reflecting surface 2b and reflect the same in the incident direction.

The holding member 3 is a hollow portion in which a cylinder is connected to the great circle side of the truncated cone.
It has a shape having 3a. A screw portion 3c is formed on the inner periphery of the open end 3b of the hollow portion 3a. In this screw part 3c,
An annular bracket 5 is screwed so as to be freely fitted by a screw portion 5a provided on the outer circumference. Corner prism 2
Are mounted on the bracket 5 and held by the holding member 3. A rod portion 6 is formed at one end of the holding member 3 on the side opposite to the placket 5 in a direction perpendicular to the incident / transmission plane 2a of the corner prism 2. This rod part 6
An attaching screw 6a for attaching the reflecting device 1 to a base (not shown) is formed on the outer periphery of one end of the holding member 3 side.
At the center of the rod portion 6 in the axial direction, there is a hollow portion with an intermediate wall 6b interposed
One hole 6c communicating with 3a and the other hole 6d are formed. A light emitting diode 4a, which is an illumination light source as shown in FIG. 1, is mounted in the hole 6c from the hollow portion 3a side. It is exposed to the apex part A forming 2c. In this case, in this embodiment, the light emitting diode 4a is mounted as the light source, but the light emitting diode 4a is not limited to this example as long as it can emit light, and may be a bean ball, for example.
The hole 6d is provided with a terminal 4c to which the lead wire 4b from the light emitting diode 4a is connected, and the hole 6d provided with the terminal 4c.
Form a connector 7. A resistor R for adjusting the amount of light is connected to one of the lead wires 4b. One of the cables 8 connected to a power source (not shown) is connected to the connector 7. Although the power supply is exclusively for the lighting device 4, a lightwave power supply used for a lightwave rangefinder can be used.

Another embodiment of the reflecting device 1 is shown in FIGS. 3 and 4.

In the reflection device 1 of FIG. 3, a screw hole 6e is formed at the center of the mounting screw 6a formed on the holding member 3, and a separate rod portion 6 holding the light emitting diode 4a in the screw hole 6e.
Is the screw part formed on the outer periphery of the tip of the light emitting diode 4a side.
6f is detachably screwed. A switch 9 for switching the light amount is provided on the outer periphery of the intermediate portion of the rod portion 6.

The reflecting device 1 of FIG. 4 has a mounting screw 6a for the case where the rod portion 6 cannot be extended from one end of the mounting screw 6a.
The rod portion 6 is separated from one end of 6a, and the connector 7 is separated. The connector 7 is provided at an appropriate portion where the inclined surface of the holding member 3 is formed. Light emitting diode
Although not shown, the lead wire 4b from 4a is connected to the terminal 4c of the connector 7 through the hole 6c and the inside of the hollow portion 3a.

Next, the operation will be described based on the above configuration.

The reflection device 1 is arranged at the measurement point, and the switch of the illumination device 4 of the reflection device 1 is turned on to cause the light emitting diode 4a to emit light. The light of the light-emitting diode 4a transmitted from the transmission surface 2c to the incident / transmission plane 2a side is collimated by the collimation telescope provided in the optical distance meter, and the image of the light-emitting diode 4a coincides with the center of the reference scale of the collimation telescope. As described above, the light is properly emitted toward the reflecting device. The emitted light enters from the entrance / exit transmission plane 2a formed on the prism 2 of the reflection device 1 and strikes the reflection surface 2b. The light striking the reflecting surface 2b reaches the light wave range finder which is reflected and emitted in the same direction as the incident direction. In this way, the time from the time when the light is emitted to the time when the light is reflected by the reflection device 1 and returned is measured, and the distance to the measurement point is measured.

[Effect] As described above, according to this reflecting device, the transmissive surface parallel to the incident / exit transmissive plane is formed near the apexes formed on the three reflective surfaces of the corner prism, and the rear surface of the transmissive surface is illuminated. Since the light source is arranged, the luminous flux from the light source can be effectively emitted to the side of the optical distance meter, and even when measuring at night or in a dark environment such as in a tunnel or measuring a long distance, the prism of the reflector can be easily used. The center can be collimated.

[Brief description of drawings]

1 and 2 show an embodiment of the reflecting device of the present invention. FIG. 1 is a sectional view of a main part of the reflecting device, and FIG.
FIG. 3 is an overall perspective view of a corner prism, and FIGS. 3 and 4 are cross-sectional views of essential parts showing another embodiment of a reflecting device. 1 ... Reflecting device, 2 ... Corner prism 2a ... Injection / transmission plane, 2b ... Reflecting surface 2c ... Transmissive surface, 3 ... Holding member 4a ... Light emitting diode (illumination light source) A ... Vertex

Claims (3)

[Scope of utility model registration request] 1. A reflection device having a corner prism, which has a substantially triangular pyramid shape, a bottom surface forms an incident / transmission / transmission plane, and the other three surfaces form three reflection surfaces whose ridge lines form a right angle to each other. A reflecting device characterized in that a transmission surface parallel to the incident / transmission transmission plane is formed in the vicinity of apexes formed on the three reflection surfaces of the corner prism, and an illumination light source is arranged behind the transmission surface. 2. The reflection device according to claim 1, wherein the illumination light source is fixed to a holding member which holds the corner prism. 3. The reflection device according to claim 1, wherein the illumination light source is detachably held by a holding member holding a corner prism.