JPS59221610A - Distance measuring device - Google Patents

Abstract

PURPOSE:To set accurately the position where spot light beams from light sources for fitting adjustment cross each other by providing the light source for fitting adjustment on a projection and a photodetection side, and setting a surface to be measured at the intersection of the spot light beams. CONSTITUTION:Light emitted by the light source 1 for distance measurement 1 is converged into spot light on the surface 11 to be measured through a half-mirror 2 and a lens 3 for projection, and detected by a light position detecting element 6 through a lens 4 for photodetection arranged slantingly above and a dynamic mirror 5. The light source 7 for fitting adjustment which emits visible light is provided on the projection side, and the light source 8 which emits visible light different in wavelength from the light source 7 is provided on the photodetection side. A distance measuring device is installed so that the spot light beams from the light sources 7 and 8 cross each other on the surface to be measured, and consequently the measurement is performed accurately.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a distance measuring device using infrared light, in which visible spot light of a lever is focused on a surface to be measured from a light emitting system side and a light receiving system side. Positional Relationship - This invention relates to a distance measuring device that can easily detect whether or not it is installed in a position where distance measurement is possible.

[Background technology]

Conventionally, for the first time with a distance measuring device that uses infrared light, when the device is installed opposite the surface to be measured, it is necessary to check whether the distance between the device and the surface to be measured is within the measurable area. In this case, distance measurement is actually performed and the output signal is used to set the device in an operating range where distance measurement is possible.

[Purpose of the invention]

An object of the present invention is to provide a distance measuring device using the above-mentioned infrared light, which can be easily and accurately set at an appropriate position with respect to a surface to be measured. .

[Disclosure of the invention]

The gist of this invention is to provide a distance measuring device that detects a position by having a position detection element receive the projected infrared light, and to arrange a light source for mounting and adjustment on the light emitting side and the light receiving side. This distance measuring device is capable of irradiating light emitted from a light source as a spot light onto a surface to be measured through the infrared light projecting lens or light receiving lens and along the light projecting axis or the light receiving axis.

The present invention will be explained below based on illustrated examples.

1st Fj! J and! Figure $2 shows an embodiment of the present invention.

The light emitted from the distance measuring light source (1) is directed toward the measurement target via a half mirror (21) tilted at 45 degrees with respect to the optical axis and a projection lens (31) arranged perpendicular to the optical axis. surface(
11) is focused as a spot light. The spot light is transmitted to an optical position detection element (61) via a light receiving lens (4) and a dichroic mirror (51) arranged diagonally above.
Detected by

Emitter lens (6), light receiver lens (4), light source (1)
, the light-receiving element (6), etc. are generally arranged so as to satisfy the Scheimpflug condition with respect to the surface to be measured (11), and are In this embodiment, the light receiving element (6) is designed to take in the reflected light from the dichroic mirror (5) that satisfies the Scheimpflug condition as is. is placed in the center of the distance measuring device, making the entire device more compact.

As the position detection device (6), a two-dimensional or more PSD solid-state image sensor or the like is used.

The output signal of the position detection device (6) is displayed as a required distance value via an amplification section (12), a processing section (13) for digitization, etc.

By detecting the position of the spot light on the surface of the position detection element (6), the distance to the surface to be measured is detected. This distance measuring device has the following system added for installation adjustment. A light source for mounting adjustment (71 is made of a red LED or the like that emits visible light. This light source (C is a light source whose optical axis is inclined at 45 degrees with respect to the half mirror (2)). The light is reflected by the half mirror (21) and focused onto the surface to be measured by the projection lens (3).On the other hand, another light source (8) for mounting adjustment uses a wavelength different from that of the light source (71). The light source 18) emits visible light, for example, from a green LED, and the light emitted from the light source 18) is focused onto the surface to be measured by the light receiving lens (41) via the dichroic mirror [5]. .

The light emitted from the light source (2) and the light source (8) is reflected by the half mirror (21 or transmitted through the dichroic mirror 15) so that the light does not overlap with the distance measuring light source (11, etc.). The light emitted from the light source (71) and the light source (83) intersect at a position at an appropriate measurement distance.

Therefore, the distance between the distance measuring device and the surface to be measured (11) is
If appropriate, as shown in Figure 2 (bl), the spot of the red light emitted from the light source and the green light emitted from the light source (8) +91. (10) overlap at one point, but it is possible to If the distance is short, the green spot (91) is focused on the right side of the red spot (1o), as shown in FIG. 2 (al).

If it is far away, the green spot (9) is focused to the left of the red spot (1o), as shown in Figure 2 (C1).In this way, the two spots (91, (10) ), the distance measuring device can be easily set so that the spot lights (9) and (1o) overlap with respect to the surface to be measured.And when the two spot lights (91, (10) overlap) , the light emitted from the light source 111 is detected by the position detection element (6
) at a predetermined position (for example, the central position as shown in the figure),
Measurement target surface (11
) movement can be detected.

Switching on and off of the light source (1) for distance measurement and the light source (8) for adjusting the mounting position is generally performed using an ordinary power supply switch.

〔Effect of the invention〕

The distance measuring device according to the present invention has two light sources for mounting adjustment as described above, so by lighting up the light sources and setting the two spot lights at a position where they intersect (overlap), On the other hand, it can be easily and accurately set at an appropriate position.

[Brief explanation of drawings]

Figure 1 and ji! Figure 2 shows an embodiment of this invention. @Figure 1 is a schematic side view, Figure 2 (at, (bl,
(Cl C is each a plan view.

Claims (1)

[Claims] (1) In a distance measuring device that detects a position by having a position detection element receive infrared light to be projected, a light source for mounting adjustment is arranged on the light emitting side and the light receiving side, and the light emitted from each light source is A distance measuring device that can freely irradiate external light as a spot light onto a surface to be measured through a projecting lens or a light receiving lens and along a projecting axis or a receiving axis.