JPS598221Y2 - Automatic collimation optical distance meter device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic collimating optical range meter that automatically collimates with respect to a land origin when measuring the position of a movable object such as a floating work platform using a optical range meter.

Conventionally, when determining the position of a movable body such as a working platform at sea, it has been difficult to determine the position of the platform due to the special circumstances of being at sea, that is, the movement of the platform due to the motion of seawater.

In addition, when using a light wave rangefinder to determine the position of the boat platform, a dedicated operating shell is used to allow each lightwave rangefinder installed on the boat platform to aim at the reflector that serves as the reference origin located at the land origin. I needed it.

In addition, measurement was stopped until the operator's sight was determined, resulting in a lack of speed in measurement work.

The present invention was developed in view of the above, and an object of the present invention is to provide an automatic collimating optical range finder that is designed to easily and quickly determine the position or amount of movement of a moving body such as a floating work platform. This is the purpose.

The feature of the present invention is that a light wave rangefinder is supported on a movable body such as a ship's platform so that it can rotate freely in the horizontal direction and freely in the vertical direction, and a collimating telescope is placed at the top or bottom of the center of the body of the light wave rangefinder. A 4-split light-receiving element is fixed near the focus of the objective lens of the telescope, and the light from the light source provided above or below the distance-measuring corner prism placed on land is directed to the center of the 4-split light-receiving element. The light-receiving image due to the misalignment of collimation is amplified by the differential output of two sets of light-receiving elements facing each other perpendicularly to the horizontal and vertical directions of the four-split light-receiving element. It is supplied to horizontal and vertical rotation drive motors to automatically track the direction of the light source, and for land-based light sources, an objective lens or cylindrical power lens is installed in front of the light source to increase the luminous flux utilization rate and illuminate a wide horizontal area. Alternatively, it can be installed in combination, and the signal beam of the light source is distinguished from natural light as a flashing light by a chopper installed in front of the light source, and the distance between the moving body and the land origin can be automatically measured regardless of day or night. be.

The present invention will be explained below with reference to examples.

FIG. 1 is a schematic cross-sectional view of a collimated optical distance meter according to an embodiment of the present invention.

In the collimating optical distance meter shown in FIG. 1, numeral 1 is a leveling device fixed on a work platform, and 2 is a pedestal for supporting the optical distance meter 3.

A rotating shaft 4 fixed to a frame 2 is pivotally supported on the leveling device 1, a gear 5 is fixed to the rotating shaft 4, and a gear 7 fixed to the rotating shaft of a servo motor 6 is meshed with the point shaft 5.

In addition, a shaft 8 is extended from the light wave distance meter 3 to both sides, and the shaft 8 is supported by a pair of bearings provided on the mount 2. A sector gear 9 is fixed to one end of the shaft 8, and the shaft 8 is connected to the rotating shaft of the servo motor 10. The worm 11 is fixed, and the worm 11 and the sector gear 9 are meshed.

Therefore, the rotation of the servo motor 6 causes the light wave distance meter 3 to rotate in the horizontal direction, and the rotation of the servo motor 10 causes the light wave distance meter 3 to rotate in the vertical direction to change its elevation angle.

Further, a collimating telescope 12 is fixed to the upper center of the optical distance meter 3 so that its tip axis is parallel to the optical axis of the optical distance meter 3.

A four-part light-receiving element 14, which is known from Japanese Patent No. 18588 (1972), is fixed to the collimating telescope 12 near the focal point of the objective lens 13, as shown in FIG.

The outputs of the horizontally opposing photodetectors of the 4-split photodetector 14 are input to the differential amplifier 15 and amplified, and the outputs of the amplifier 15 are input to the servo motor 6. The output of the light receiving element is input to the differential amplifier 16 for amplification, and the output of the amplifier 16 is input to the servo motor 10.

On the other hand, a distance measuring corner prism 18 serving as a reference position on land is rotatably fixed on a leveling device 17 so as to be substantially horizontal, its leading axis is set in the direction of the ship's platform, and the prism is fixed with a clamp 19.

In addition, a reference light source device 20 is mounted on the housing of the corner prism 18.
is fixed so that its optical axis is parallel to the optical axis of the corner prism 18.

The reference light source device includes a light source 21 on the focal plane of the condensing objective lens.
A cylindrical lens 23 is provided in front of the objective lens 22, or is provided in combination with the objective lens 22, to spread the light beam horizontally as shown in FIG.

Further, a chopper 24 is mechanically provided in front of the light emitting source 21 to interrupt the light beam from the light emitting source 21.

Corner frame 18 remains fixed, approximately ±3
It has the advantage of returning the incident light in the same direction as the projected light for incident light at an incident angle of 0°.

Note that 25 and 26 are clamps for fixing the positions of the leveling device 1 and the mount 2 and the positions of the light wave range finder 3 and the mount 2, respectively, with the light wave distance meter 3 facing approximately in the direction of the corner prism 18. be.

In the collimating optical distance meter configured as described above, the intermittent modulated light beam from the reference light source device 20 is imaged on the four-part light receiving element surface provided in the collimating telescope 12, and the image is formed due to the deviation of collimation. The output of each of the four divided light receiving elements changes depending on the deviation from the center point.

In other words, the horizontal shift causes an output difference between the horizontally opposing photodetectors of the 4-split photodetector, and this output difference is amplified by the amplifier 15, and only the modulation frequency component of the modulated light beam is extracted through the bandpass filter. , servo motor 6
The optical distance meter 3 is rotated in the horizontal direction via the gears 5 and 7, and due to the vertical deviation, there is an output difference between the vertically opposing light receiving elements of the 4-split light receiving element, and this output is The difference is similarly amplified by an amplifier 16, and only a certain modulation frequency portion of the modulated light beam is extracted through a bandpass filter, and the servo motor 10 is driven to generate a worm 11 and a sector gear 9.
The optical distance meter 3 is rotated in the vertical direction via the telescope 12 , that is, the optical axis of the optical distance meter 3 is automatically tracked in the direction of the corner prism 18 .

Therefore, even if there is movement of the boat platform on which the lightwave rangefinder 3 is installed due to the movement of the seawater, the lightwave rangefinder 3 will always track in the direction of the corner prism 18, and the lightwave rangefinder 3 will always track in the direction of the corner prism 18. The deviation can be measured and calculated.

Further, the light beam from the reference light source device 20 can be distinguished from natural light because it is modulated intermittently by a mechanical chopper.

Further, by installing a single cylindrical lens or a combination of cylindrical lenses in front of the objective lens 22 of the reference light source device 20, it is possible to increase the utilization rate of the light beam of the light receiving source and to illuminate a wide horizontal area.

Therefore, if there is no need for this, the light beam may be projected only by the objective lens 22 without using the cylindrical drill lens.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view for explaining a collimating rangefinder according to an embodiment of the present invention, FIG. FIG. 3 is a sectional view for explaining a reference light source device installed on land. Explanation of symbols 1 and 17...Leveling device, 2.
... Frame, 3... Lightwave distance meter, 4...
... Rotating axis, 5 and 7 ... Gear, 6 and 10 ... Servo motor, 8 ... Axis, 9
...Sector gear, 11 ...Worm, 1
2... Sighting telescope, 13 and 22...
・Objective lens, 14... 4-split light receiving element, 15
and 16...differential amplifier, 18...
Corner prism, 20...Reference light source device, 2
1...Light source, 23...Cylindrical lens, 24...Mechanical output.

Claims (1)

[Scope of utility model registration request] A collimating telescope is attached to the upper or lower center of the optical range meter body, which is supported rotatably in the horizontal direction and rotatably in the vertical direction, with its optical axis parallel to the optical axis of the optical range meter. A 4-split light receiving element is fixed near the focal point of the objective lens, and light from a light emitting source disposed on land is focused on the center of the 4-segment light receiving element, and the received light image due to misalignment of collimation is transferred to the 4-segment light receiving element. The differential output of two sets of light receiving elements facing each other orthogonally in the horizontal and vertical directions is amplified and supplied to the horizontal and vertical rotation drive motors of the light wave distance meter support mechanism to automatically track the light in the direction of the light receiving source. A collimated optical distance meter placed on a moving body such as a ship's platform, and an objective lens or a cylindrical lens mounted singly or in combination on the front of the light source to increase the luminous flux utilization rate and illuminate a wide horizontal area. Furthermore, the signal beam of the light emitting source is differentiated from natural light as blinking light by a chopper provided in front of the light emitting source, and is applied to the upper or lower part of the corner prism, parallel to the optical axis of the corner prism, which is installed as a land-based light emitting source. An automatic collimating optical distance meter device consisting of a combination of a reference light source device fixed according to the distance between the optical distance meter body and a collimating telescope.