JPS6239902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object] Industrial Field of Use The present invention relates to an optical system for a lightwave rangefinder, and particularly to an optical system for a lightwave rangefinder that is capable of simultaneous collimation.

BACKGROUND ART A conventional optical distance meter is of a type in which a light transmitting system and a light receiving system are disposed oppositely to each other with respect to the optical axis of an objective lens.

Generally, when measuring distance using light waves, the reflected light is received by a light receiving system using the frequency of the light waves from the light emitting system as a reference, and is converted into an electrical signal for electrical processing. At this time, the reference light serving as a standard is guided from the light emitting element to the light receiving element via an internal optical path. In the conventional optical distance meter in which the light transmitting system and the light receiving system are arranged oppositely to each other with respect to the optical axis of the objective lens, it is difficult to form an internal optical path, and it is especially difficult to measure angles in addition to distance measurements. The formation of the internal optical path and the collimation optical system for a light-wave distance meter capable of simultaneous collimation have become even more complex and difficult, making it necessary to mount the light-wave distance meter on top of the surveying instrument. and there are limits to the simplification of operations,
Moreover, the cost had to be high.

Problems to be Solved by the Invention The present invention is capable of transmitting and receiving light through one objective lens, and simultaneously transmits and receives light through a single objective lens. This makes it possible to incorporate it into the lens barrel of a single telescope, thereby not only making the machine more compact and simplifying its operation, but also making it possible to obtain an optical system for an optical rangefinder that is cheaper than conventional ones. This is the purpose.

[Structure of the invention]

Means for Solving the Problems In order to achieve the above object, the present invention provides a light transmitting system having a light emitting element and a light receiving system having a light receiving element on only one side with respect to the optical axis of the objective lens. , a splitting prism is disposed on the optical axis of the objective lens and between the objective lens and the light transmitting system or the light receiving system, and the splitting prism passes the incident light that passes through the objective lens to the splitting prism to a light receiving element. a reflective surface A that refracts the light toward the prism, a refracting surface B that transmits the incident light from the light emitting element into the prism, a reflective surface C that further refracts the refracted light refracted by the refracting surface toward the objective lens, and the reflective surface It has an optical system of a light wave distance meter, which is provided with an exit surface D for transmitting light reflected from the surface to an objective lens, and is provided with a collimation optical system.

Embodiments The present invention will be described below with reference to the drawings.

FIG. 1 shows an objective lens 1 of a light wave distance meter according to the present invention.
This is a diagram showing the positional relationship between the splitting prism 4 and the objective lens 1 of the splitting prism 4 and the light transmitting system or the light receiving system.
A light transmitting system having a light emitting element 3 such as a light emitting diode and a light receiving system having a light receiving element 2 such as a light receiving diode are both disposed on only one side of the objective lens 1 on the optical axis X-X'. A splitting prism 4 is disposed between the objective lens 1 and the light receiving system or between the objective lens 1 and the light transmitting system. In this embodiment, the splitting prism 4 is a prism having a hexagonal longitudinal section, and includes a reflecting surface A that refracts incident light that passes through the objective lens 1 and reaches the splitting prism 4 toward the light receiving element 2, and a light emitting surface. A refractive surface B that transmits the incident light from the element 3 into the splitting prism 4, a reflective surface C that further reflects the refracted light refracted by the refractive surface B toward the objective lens 1, and light reflected from the reflective surface. It is integrally provided with an exit surface D for transmitting light to the objective lens.

That is, the reflecting surface A is provided on one split prism 4 for either the light transmitting system or the light receiving system, which is disposed only on one side with respect to the optical axis of the objective lens 1.
The refracting surface, the exit surfaces B and D, and the reflecting surface C of the splitting prism 4 are used for the other part to cause the incident and exit.

The incident light is reflected by the reflective surface A of the splitting prism 4 and reaches the light receiving element 2, and the light from the light emitting element 3 enters the splitting prism 4 through the refractive surface B of the splitting prism 4, and is reflected by the reflecting surface C. It is reflected, exits from the splitting prism 4 through the exit surface D, and exits the system through the objective lens 1.

Note that the positions of the light transmitting system having the light emitting element 3 and the light receiving system having the light receiving element 2 may be exchanged.
For example, in FIG. 1, the light transmitting system and the light receiving system may be replaced so that the light emitting element is placed at the position of the light receiving element 2 and the light receiving element is placed at the position of the light emitting element 3.

FIG. 2 shows an optical system of a simultaneous collimation optical distance meter which is an embodiment of the present invention.

The positional relationship between the objective lens 1 and the splitting prism 4 of this optical distance meter, and the objective lens 1 of the splitting prism 4
The positional relationship between the light transmitting system or the light receiving system and the structure of the splitting prism 4 are the same as those shown in FIG. 1 and explained with reference to FIG. 1 above. The collimating optical system is a simultaneous collimating optical system. That is, on the optical axis X-X' of the objective lens 1, a reflecting prism 5 having dimensions smaller than the convergent light of the objective lens is provided in contact with the front surface of the splitting prism 4, and the reflecting prism 5 is arranged on the optical axis X-X' of the objective lens 1. With respect to Another reflective prism 6 is provided for bending again to make the collimating optical axis parallel to the optical axis of the objective lens on the opposite side, and an afocal lens 7, an afocal plate 8, and an eyepiece 9 are arranged. A simultaneous collimation optical system was constructed.

In this embodiment, the reflecting prism 5 is provided in contact with the front surface of the splitting prism 4, and the fixing means thereof can be fixed with adhesive, and there is no need to use a reflecting prism frame or the like. Not only can the reflecting prism 5 and the dividing prism 4 be fixed easily and at low cost, but also
When the reflecting prism 5 and the dividing prism 4 are installed apart from each other, it is possible to prevent ghosts from occurring due to reflections on the rear surface of the reflecting prism 5. Furthermore, the afocal lens 7 has the function of collimating near and far objects. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts as in FIG. 1.

FIG. 3 shows a simultaneous collimation optical system according to another embodiment of the present invention.

In this embodiment, the positional relationship between the objective lens 1 and the splitting prism 4, the positional relationship between the objective lens 1 of the splitting prism 4 and the light transmitting system or the light receiving system, the reflecting surfaces A, C, the refractive surface, and the exit surface of the splitting prism 4. The formation of B and D is also the same as in FIG. In this embodiment, a collimating through hole 13 is provided which penetrates the central part of the split prism 4 in the front-rear direction and is configured in the same manner as shown in FIG. This through hole is formed to have a smaller size than the convergent light of the objective lens 1.

An afocal lens 10, an afocal plate 11, and an eyepiece 1 are provided behind the collimation aperture 13 of the split prism 4.
2 was provided to form a simultaneous collimation optical system.

The fact that the afocal lens 10 has the function of collimating near and far objects is similar to the above explanation regarding FIGS. 2 and 3. In FIG. 3, the same reference numerals as in FIG. 1 indicate the same parts as in FIG. 1.

〔Effect of the invention〕

The present invention provides a structure in which a light transmitting system having a light emitting element and a light receiving system having a light receiving element are both disposed on only one side with respect to the optical axis of the objective lens, and the objective lens is located on the optical axis of the objective lens. and a light transmitting system or a light receiving system, a reflecting surface A that refracts the incident light that passes through the objective lens and reaches the splitting prism toward the light receiving element, and a refracting surface B that transmits the incident light from the light emitting element into the prism. , a splitting prism configured to include a reflecting surface C that further refracts the refracted light refracted by the refracting surface toward the objective lens, and an exit surface D that transmits the reflected light from the reflecting surface to the objective lens. Because of this arrangement, unlike the optical system of conventional optical rangefinders, there is no need to use separate objective lenses for the light transmitting system and the light receiving system, but only one objective lens and one objective lens for the light receiving system are used. The split prism makes it possible to transmit and receive light into and out of the light transmitting system and light receiving system, which are provided only on one side of the optical axis of the objective lens.The light receiving system receives the reflected light from the light emitting system, and generates electricity. It is easy to form an internal optical path that guides the standard reference light from the light emitting element to the light receiving element when converting it into a signal and electrically processing it, and it can be used to create a light transmitting system, a light receiving system, a collimating optical system, especially a simultaneous collimating optical system. This makes it possible to incorporate the optical distance meter into the lens barrel of a telescope, which not only makes the machine more compact and simplifies its operation, but also allows the optical distance meter to be mounted on a surveying instrument. Compared to a light wave distance meter, it has the effect of being able to obtain light wave distance at a lower cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the optical system of a light wave distance meter according to the present invention, FIG. 2 is an explanatory diagram of the optical system of a simultaneous collimation optical distance meter which is an embodiment of the present invention, and FIG. FIG. 2 is an explanatory diagram of an optical system of a simultaneous collimation optical rangefinder according to an embodiment. 1... Objective lens, 2, 3... Light receiving, light emitting element, 4... Division prism, 5, 6... Reflecting prism, 7, 10... Afocal lens, 8, 12... Eyepiece lens, 9, 11 ... Focus plate, 13... Hole for collimation, A... Reflection surface of the splitting prism, B... Refraction surface of the splitting prism, C... Reflection surface of the splitting prism, D... Exit surface of the splitting prism.

Claims (1)

[Scope of Claims] 1. A light transmitting system having a light emitting element and a light receiving system having a light receiving element are both disposed on only one side with respect to the optical axis of the objective lens, and the optical axis of the objective lens is on the optical axis of the objective lens. A splitting prism is arranged between the lens and the light transmitting system or the light receiving system, and the splitting prism includes a reflecting surface A that refracts incident light that passes through the objective lens and reaches the splitting prism toward the light receiving element, and a light emitting element. a refractive surface B that transmits the incident light from the refractive surface into the prism, a reflective surface C that further refracts the refracted light refracted by the refractive surface toward the objective lens, and transmits the reflected light from the reflective surface to the objective lens. An optical system for a light wave rangefinder, which is provided with an exit surface D for the purpose of the optical system, and is also provided with a collimation optical system. 2. The optical system for a light wave distance meter according to claim 1, wherein the split prism has a hexagonal longitudinal section. 3. The collimating optical system is provided with a reflection prism on the optical axis of the objective lens, which is in contact with the front surface of the splitting prism and whose dimensions are smaller than the convergence light of the objective lens, and the reflection prism has a diameter that is smaller than the convergence light of the objective lens. The collimating optical axis is bent to a side opposite to the side where both the light transmitting system and the light receiving system are disposed, and the bent collimating optical axis is bent again to direct the light of the objective lens on the opposite side. 2. The optical system for a light wave distance meter according to claim 1, wherein the collimating optical system is formed by providing another reflective prism for setting the collimating optical axis parallel to the axis. 4. The optical system for a light wave rangefinder according to claim 1, wherein the collimating optical system is formed by passing a collimating hole through the center of the split prism and forming the collimating optical system behind the split prism.