WO2024262414A1 - Guide light beaming device - Google Patents

Abstract

This guide light beaming device that beams guide light for indicating direction to a stakeout worker is configured such that: the optical system of the guide light beaming device includes a beaming lens (12), a spectroscopic plate (15), and a light source (14); the light source is a broadband light source for emitting broadband light; a coloring element (17) is formed on the spectroscopic plate; the coloring element has at least two regions (17a, 17b) having different spectral characteristics; one of the spectroscopic plate or the light source is positioned on or near the focal position of the beaming lens and the other of the spectroscopic plate or the light source is positioned near or on the focal position of the beaming lens; and the light emitted from the broadband light source is colored by the regions and beamed from the beaming lens as guide light (18) including at least two colors.

Description

Guide light irradiation device

The present invention relates to a guide light irradiation device that emits guide light to guide survey workers.

A guide light irradiation device that emits guide light to guide construction workers during construction work is known.

The guide light is a different color on the left and right sides of the sighting axis, and is irradiated towards the staking point. The staking worker visually checks the guide light and distinguishes the color to determine the direction to move in, and is guided to the staking point by moving to the boundary between the left and right colors.

Conventionally, guide light irradiation devices have light sources arranged opposite each other, and a right-angle mirror. The two light sources emit light of different colors, and the light is incident on two perpendicular reflecting surfaces of the right-angle mirror. The two colors of light reflected by the reflecting surfaces are emitted as guide light with a boundary. An example of a guide device is shown in Patent Document 1.

　Conventional guide light irradiation devices require two light sources of different colors and a right-angle mirror, and because they have a large number of parts and the light sources are placed opposite each other, they take up a large amount of space. Furthermore, the task of aligning the two light sources and the right-angle mirror is complicated.

JP 2020-165839 A JP 2015-40831 A

The present invention provides a guide light irradiation device that has a small number of parts and can be easily manufactured.

The present invention relates to a guide light irradiation device that irradiates guide light to indicate directions to surveying workers, the optical system of the guide light irradiation device including an irradiation lens, a spectral plate, and a light source, the light source being a broadband light source that emits light in a broadband, a coloring element being provided on the spectral plate, the coloring element having at least two regions with different spectral characteristics, one of the spectral plate and the light source being positioned at or near the focal position of the irradiation lens, and the other being positioned at or near the focal position of the irradiation lens, the light emitted from the broadband light source being colored by the region, and the guide light irradiating device being configured to be irradiated from the irradiation lens as guide light including at least two colors of light.

The present invention also relates to a guide light irradiation device in which the guide light irradiation optical system includes a plurality of light sources, the optical axes of the plurality of light sources are arranged in the same vertical or horizontal plane, the irradiation lens is provided on each of the optical axes corresponding to the light source, the spectroscopic plate is provided between the irradiation lens and the light source, the boundary of the region is included in the plane, and the light emitted from the plurality of light sources is colored by the region, irradiated by the irradiation lens, and collected to be irradiated as guide light including at least two colors of light.

The present invention also relates to a guide light irradiation device in which the light source is a white LED that emits visible white light.

The present invention also relates to a guide light irradiation device in which the light source is an LED that emits invisible near-infrared light.

The present invention also relates to a guide light irradiation device in which the spectral plate has the color-developing elements formed on a transparent substrate.

The present invention also relates to a guide light irradiation device in which the spectral plate has the color-developing elements formed on the reflecting surface of a reflector.

The present invention also relates to a guide light irradiation device in which the spectroscopic plate has a blinking means, making it possible to blink at least one of the regions.

The present invention also relates to a guide light irradiation device in which the spectral plate includes a liquid crystal plate having optical transparency, and the liquid crystal plate is a coloring element that forms at least two regions with different spectral characteristics.

The present invention also relates to a guide light irradiation device in which the liquid crystal plate is configured to be able to blink at least one of the regions.

The present invention also relates to a guide light irradiation device in which the color-developing element is divided into multiple parts vertically or horizontally and has multiple regions.

The present invention also relates to a guide light irradiation device in which the color-developing element is further divided into two parts, left and right or top and bottom, and has multiple regions.

The present invention also relates to a guide light irradiation device in which the color-producing element is divided into two parts, an upper part and an lower part, each part having a plurality of regions, and the blinking means is configured to blink one of the upper and lower parts.

The present invention also relates to a guide light irradiation device in which the color-producing elements have a gradation in which the color changes gradually from one end to the other.

The present invention also relates to a guide light irradiation device in which the transparent substrate is rectangular in shape, the region is divided into two along the short side, and color-producing elements with different spectral transmittances are provided in the divided portion to form two regions, a boundary extending in the longitudinal direction of the transparent substrate is formed by the two regions, a plurality of the light sources are provided within a plane including the boundary, and the optical axes of the light sources are inclined at a predetermined angle to each other.

The present invention also relates to a guide light irradiation device in which the irradiation lens is an anamorphic lens.

The present invention also relates to a guide light irradiation device in which the spectral plate has a rectangular shape that transmits light from the multiple light sources, the region is divided into two along the short side, and color-producing elements with different spectral characteristics are provided in the divided portion to form two regions, and the two regions form a boundary that extends in the longitudinal direction of the transparent substrate, and the boundary is configured to be included within the plane.

The present invention also relates to a guide light irradiation device in which the spectroscopic plate is made up of small spectroscopic plates arranged on the optical axes of a plurality of the light sources in correspondence with the light sources, at least two regions are formed on the small spectroscopic plates, and coloring elements having different spectral transmittances are provided in each region, and the boundaries of the regions are included in the plane.

The present invention also relates to a guide light irradiation device in which the optical axes of the light sources are inclined at a predetermined angle in the direction in which the light irradiating the light expands.

The present invention also relates to a guide light irradiation device in which a guide light irradiation unit is constituted by the irradiation lens, the small spectrometer, and the light source, which are arranged on the optical axis of the light source, and the guide light irradiation optical system is composed of a plurality of guide light irradiation units, one guide light irradiation unit has a reference optical axis parallel to the collimation direction, and the optical axes of the other guide light irradiation units are inclined at a predetermined angle with respect to the reference optical axis in the direction in which the irradiated light expands.

The present invention also relates to a guide light irradiation device in which a guide light irradiation unit is formed by the irradiation lens, the small light plate, and the light source, which are arranged on the optical axis of the light source, and the guide light irradiation optical system is composed of five guide light irradiation units, one guide light irradiation unit has a reference optical axis parallel to the collimation direction, two guide light irradiation units are provided in a vertical plane including the reference optical axis, symmetrically from top to bottom with respect to the reference optical axis, and two guide light irradiation units are provided in a horizontal plane including the reference optical axis, symmetrically from left to right with respect to the reference optical axis, a guide light is formed by a collection of light emitted from the five guide light irradiation units, each of the small light plates is divided into regions so that the guide light has a boundary included in the vertical plane and a boundary included in the horizontal plane, and color-developing elements are formed in the regions.

The present invention also relates to a guide light irradiation device in which the spectroscopic plate has a blinking means, making it possible to blink at least one of the regions.

According to the present invention, there is provided a guide light irradiation device that irradiates guide light to indicate directions to surveying workers, and the optical system of the guide light irradiation device includes an irradiation lens, a spectral plate, and a light source, the light source is a broadband light source that emits light in a broadband, a coloring element is provided on the spectral plate, and the coloring element has at least two regions with different spectral characteristics, one of the spectral plate and the light source is configured to be located at or near the focal position of the irradiation lens, and the other is configured to be located near or at the focal position of the irradiation lens, and the light emitted from the broadband light source is colored by the region, and is configured to be irradiated from the irradiation lens as guide light containing at least two colors of light, so that the optical system has a simple configuration, has a small number of parts, and can be easily manufactured.

FIG. 1 is an explanatory diagram showing an outline of a guide light emitting device according to a first embodiment. FIG. 2A is an explanatory diagram showing a main part of a guide light emitting optical system of the guide light emitting device, and FIG. 2B is a diagram showing a cross section of a light beam of the guide light. FIG. 3 is an explanatory diagram of color-developing elements. FIG. 4 is a graph showing the spectral characteristics of the light source, the transmittance characteristics of the dichroic film, and the spectral characteristics of light after passing through the dichroic film in this embodiment. FIG. 5 is an explanatory diagram showing a first modification of the coloring element. FIG. 6 is an explanatory diagram showing a second modification of the coloring element. FIG. 7 is an explanatory diagram showing a third modification of the coloring element. FIG. 8 is an explanatory diagram showing a fourth modification of the coloring element. FIG. 9 is an explanatory diagram showing a fifth modification of the coloring element. FIG. 10A is a schematic diagram of a guide light irradiating optical system according to the second embodiment, and FIG. 10B is a diagram showing a cross section of a light beam of guide light in the second embodiment. FIG. 11A is a schematic diagram of a guide light irradiating optical system according to the third embodiment, and FIG. 11B is a diagram showing a cross section of a light beam of guide light in the third embodiment. FIG. 12A is a schematic diagram of a guide light irradiating optical system according to the fourth embodiment, and FIG. 12B is a diagram showing a cross section of a light beam of guide light in the fourth embodiment. FIG. 13 is an explanatory diagram of the coloring elements in the fourth embodiment. FIG. 14 is an explanatory diagram showing an outline of a guide light emitting device according to the fifth embodiment. FIG. 15A is an explanatory diagram showing an irradiation state of the guide light at a short distance, and FIG. 15B is an explanatory diagram showing an irradiation state of the guide light at a long distance. FIG. 16A is a schematic diagram of a guide light emitting optical system in the fifth embodiment, and FIG. 16B is a diagram showing a cross section of a light beam of guide light in the guide light emitting optical system. FIG. 17 is an explanatory diagram of the spectroscopic plate in the fifth embodiment. FIG. 18 is an explanatory diagram of the basic configuration of the guide light irradiating optical system. FIG. 19A is a schematic diagram of a guide light emitting optical system according to the sixth embodiment, and FIG. 19B is a diagram showing a cross section of a light beam of guide light in the guide light emitting optical system. FIG. 20A is a schematic diagram of a guide light emitting optical system according to the seventh embodiment, and FIG. 20B is a diagram showing a cross section of a light beam of guide light in the guide light emitting optical system. FIG. 21 is an explanatory diagram of a coloring element having a gradation of color or brightness. FIG. 22 is a schematic diagram of a guide light irradiating optical system according to the eighth embodiment. FIG. 23 is a view taken along the arrow A in FIG. FIG. 24 is a view taken along the arrow B in FIG. FIG. 25 is a diagram showing a cross section of a light beam of guide light in the guide light irradiating optical system of the eighth embodiment.

Below, an embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing an overview of the guide light emitting device 1 according to this embodiment, and shows the guide light emitting device 1 attached to the top surface of a total station 2. The optical axis of the guide light emitting device 1 is set parallel to the collimation optical axis of the total station 2.

In addition, in Figure 1, 3 indicates a pole on which a prism 4 is mounted. In addition, Figure 1 shows the state in which the pole 3 is installed at a survey point 5.

The total station 2 is installed at a known point, and the sighting direction is set to the survey point 5.

Fig. 2(A) is a schematic diagram showing the main parts of the optical system of the guide light irradiation device 1. Fig. 2(A) shows a plan view of the optical system, with the upper side in the figure representing the right, the lower side representing the left, and the left side representing the front. Fig. 2(B) shows a cross section of the light beam of the guide light.

In FIG. 2(A), 11 denotes a guide light irradiation optical system, 12 denotes an irradiation lens, a light source 14 is provided at the focal position on the optical axis 13 of the irradiation lens 12, and a spectrometer 15 is provided in front of the light source 14. The light source 14 is a broadband light source that emits light having a wide band of wavelengths, for example an LED that emits visible white light.

In the embodiment described below, a coloring element is included as the area discrimination element, and areas of different colors are formed in the guide light.

The spectral plate 15 has color elements 17 (17a, 17b) formed on the surface of a transparent substrate 16 (see FIG. 3), and the color elements 17 have optical characteristics in which the regions 17a, 17b on the left and right of a boundary 17e passing through the optical axis 13 have different spectral transmittances. For example, a dichroic film is used as the color elements 17.

In the above explanation, in FIG. 2(A), the color-developing element 17 is formed on the surface of the spectroscopic plate 15 facing the projection lens 12, but it may be formed on the surface of the spectroscopic plate 15 facing the light source 14. Also, the spectroscopic plate 15 is provided near the focal position of the projection lens 12. The light source 14 is provided at the focal position of the projection lens 12. It is also possible to set the spectroscopic plate 15 at the focal position of the projection lens 12 and provide the light source 14 near the focal position.

The color-producing element 17 is a dichroic film, and for example, the spectral transmission wavelength of the left region 17a is 400 nm to 500 nm (blue), and the spectral transmission wavelength of the right region 17b is 650 nm to 750 nm (red).

Figure 4 shows an example of the relationship between the spectral characteristics of the LED, the transmittance characteristics of the dichroic film in region 17a, and the spectral characteristics of the LED after passing through the dichroic film. In Figure 4, curve A shows the wavelength characteristics of the light source 14, curve B shows the transmittance characteristics of the dichroic film in region 17a, and curve C shows the wavelength characteristics of the transmitted light in region 17a.

The transmittance characteristics of the dichroic film in region 17a are such that it transmits wavelengths between 400 nm and 500 nm, so the light that passes through region 17a is blue light. Although not shown, if the transmittance characteristics of the dichroic film in region 17b are 650 nm to 750 nm, the light that passes through region 17b is red light.

The white light emitted from the light source 14 passes through the spectrometer 15, and is emitted as guide light 18, with blue light 18a on the left and red light 18b on the right, and the boundary 18e indicating the position of the optical axis (see FIG. 2B). It then passes through the projection lens 12 and is irradiated toward the measurement point as guide light 18, which is an approximately parallel beam (a beam with a predetermined spread angle).

When guiding a surveyor during surveying work, if the surveyor recognizes the guide light 18 as red, it can be determined that he or she is to the right of the surveying point, and the worker will be guided to the surveying point by moving to the left.

It is also possible to form no dichroic film on either one of the regions 17a and 17b, for example, on region 17b, or to form only an AR coating. In this case, the guide light will be two colors, blue light and white light.

In the above explanation, the color-producing element 17 is divided into left and right regions 17a and 17b, but in cases where the measurement point is set in a location with a difference in elevation, or where it is necessary to guide the measurement to a specific height standard, the color-producing element 17 may be divided into upper and lower regions.

Furthermore, the manner in which the color-producing elements 17 are divided can be changed in various ways.

In the first modified example shown in FIG. 5, the color-producing element 17 is divided into a total of four parts, vertically and horizontally. Dichroic films with different spectral transmittances are formed for the four divided areas 21a, 21b, 21c, and 21d. The guide light transmitted through the color-producing element 17 forms areas of four different colors, and further forms vertical and horizontal boundaries at the boundaries of each area. Furthermore, the intersection of the vertical and horizontal boundaries coincides with the optical axis 13 of the guide light 18.

When the surveyor recognizes the guide light, he can determine which area he is in by the color, and can also use the color recognition to determine in which direction he needs to move to reach the position of the optical axis 13.

In the first modified example, the four divided regions 21a, 21b, 21c, and 21d are formed, making it possible to provide guidance in both the horizontal and vertical directions.

In addition, the color-producing element 17 may be configured so that the guide light is made up of two colors and the diagonally opposite areas are the same color.

FIG. 6 shows a second modification of the color element 17.

In the second modified example, the color-producing element 17 is divided horizontally into four to form four rectangular regions 22a, 22b, 22c, and 22d, and the spectral transmittance of the dichroic film formed in each region is made different. Regions of different colors are formed in the horizontal direction of the guide light, and the surveyor can intuitively determine in which direction and how far he or she should move by recognizing the color.

The number of divisions is not limited to four, but may be three, five or more.

Figure 7 shows a third modified example. In addition to the division of the second modified example, the third modified example is further divided into two levels, upper and lower, to form eight regions. It is also possible to color the regions in the reverse order of coloring the upper level and the lower level.

In the third modified example, the surveyor can intuitively determine in which direction and how far he or she should move by recognizing the color, and can also confirm the up/down position and the position of the optical axis 13.

In the fourth modified example shown in FIG. 8, the coloring elements 17 are formed so that they do not form distinct areas, but rather form a gradation in which the color changes gradually in the horizontal direction.

In addition, gradation can be achieved by, for example, giving a gradient to the thickness of the dichroic film.

The guide light 18 has a color gradation, allowing surveyors to intuitively determine in which direction and how far they should move by recognizing the color.

In the fifth modified example shown in Figure 9, the color-producing element 17 is divided into two, top and bottom, and a gradation in which the color gradually changes horizontally is formed in each of the top and bottom regions. Also, by reversing the color change of the top and bottom gradations, the worker can recognize his/her position in the vertical direction and intuitively judge in which direction and how far he/she should move in each of the top and bottom regions.

In the above embodiment, the color-producing element 17 is not limited to a dichroic film, and various modifications are possible. For example, it may be an absorbing film that absorbs specific wavelengths, colored glass of a different color may be used, or a phosphor may be applied to change the wavelength, an EW element may be used, or a combination of a dichroic film and a phosphor may be used.

Furthermore, the color-producing element 17 may be a transmissive liquid crystal display. For example, a transmissive organic EL display, a transmissive inorganic EL display, a transmissive liquid crystal display, etc.

In addition, to improve the distinguishability, at least one area may be made to blink. If a transmissive liquid crystal display is used as the blinking means, the area in which the liquid crystal display driver is formed may be configured to blink.

Furthermore, a mechanical light-shielding shutter may be provided on the spectrometer as a blinking means, and the area may be blinked at periodic light-shielding intervals to improve the identification of the area.

Furthermore, the blinking means can be used to distinguish between groups of areas. For example, in the coloring of the areas shown in FIG. 7, if the upper section is configured to blink, the upper and lower sections can be distinguished by the blinking, and the operator can determine whether the area is included in the upper section or the lower section.

As explained above, the light source 14 and the spectrometer 15 are both provided at or near the focal position of the irradiation lens 12, so the positional relationship between the light source 14 and the spectrometer 15 can be fixed. Therefore, the light source 14 and the spectrometer 15 can be made into a unit.

In the environment of the surveying and installation work, the total station 2 and the surveying and installation point 5 may be close or far away. When they are close, the larger the spread angle of the guide light 18, the easier it is to recognize the guide light 18 and the better the workability. On the other hand, when they are far away, if the irradiation range becomes too wide, the amount of light decreases and the workability worsens. Therefore, when they are far away, it is better for the spread angle of the guide light 18 to be small.

Therefore, it is preferable to be able to adjust the spread angle of the guide light 18 depending on the work environment.

In the above embodiment, the light source 14 and the spectrometer 15 may be combined into a light source unit, and the position of the light source unit relative to the illumination lens 12 may be adjustable. By making the configuration adjustable, the state of focusing of the guide light 18 by the illumination lens 12 can be changed by adjusting the position of the light source unit, and the spread angle of the guide light 18 can be easily adjusted.

Next, the spectrometer 15 may be made rotatable around the optical axis 13.

In this case, by rotating the spectrometer 15 by 90 degrees, the guide light 18, which is color-coded on the left and right, becomes color-coded on the top and bottom.

For example, in a location with an elevation difference, the surveyor is first guided horizontally by the guide light 18, which is color-coded left and right, and then the spectrometer 15 is rotated 90 degrees and the guide light 18 is color-coded up and down, allowing the surveyor to confirm the vertical position of the survey point. Therefore, it is possible to guide the surveyor in two directions, horizontally and vertically.

FIGS. 10(A) and 10(B) show the guide light irradiation optical system 11 of the second embodiment.

The second embodiment shows a case where the color-producing element 17 is formed on a reflective surface.

A reflector 29 is provided as a spectroscopic plate 15 on the optical axis 13 of the irradiation lens 12. A coloring element 17 is formed on the reflecting surface of the reflector 29, and the spectroscopic plate 15 is set at or near the focal position. A light source 14 is provided on the reflected optical axis of the reflector 29, and the optical axis of the reflector 29 is aligned with the reflected optical axis.

The color-producing element 17 is similar to that shown in FIG. 3, and is divided into two regions 17a and 17b at a boundary 17e that passes through the optical axis 13, and each of the regions 17a and 17b has optical characteristics with different spectral transmittances. For example, a dichroic film is used as the color-producing element 17. Alternatively, a phosphor that changes the wavelength may be applied. Furthermore, a combination of a dichroic film and a phosphor may be used.

The light source 14 is provided close to the reflector 29, and the light source 14 (light emitting point) is at or near the focal position of the irradiation lens 12.

The broadband light (white light) emitted from the light source 14 is colored by being reflected by the regions 17a and 17b, and is irradiated as guide light 18 having two colors of guide light 18a, 18b and a boundary 18e.

In the second embodiment, the light source 14 is provided on the reflected optical axis of the reflector 29, so the depth distance to the irradiation lens 12 is shortened, and the guide light irradiation optical system 11 can be configured compactly. Furthermore, bending the optical axis 13 by the reflector 29 has the advantage of increasing the degree of freedom in designing the guide light irradiation optical system 11.

In addition, a mirror may be provided between the irradiation lens 12 and the spectrometer 15 to bend the optical axis 13 multiple times.

In the second embodiment, a reflective liquid crystal display may be used as the coloring element. Furthermore, a blinking means may be added to the liquid crystal display to partially blink the formed area, thereby enhancing the distinguishability of the area.

Furthermore, the spectrometer may be a digital micromirror device (DMD), and the digital micromirror device may be combined with a color-developing element to function as an area forming means and a blinking means, so that the digital micromirror device forms an area and causes the area to blink, improving identification.

FIGS. 11(A) and 11(B) show a third embodiment. In FIG. 11(A) and FIG. 11(B), the same reference numerals are used for the parts equivalent to those shown in FIG. 2(A) and FIG. 2(B), and the description thereof will be omitted.

In FIG. 11(A), the upper side indicates the top and the lower side indicates the bottom. The top and bottom are the vertical direction, and the direction perpendicular to the paper surface is the horizontal direction. FIG. 11(B) shows a cross section of the irradiated guide light 18.

The third embodiment shows a configuration in which one light source 14 is used to increase the spread angle in the horizontal or vertical direction. Figures 11(A) and 11(B) explain the case in which the spread angle is increased in the horizontal direction.

The light source 14 is a broadband light source that emits light having a wide band of wavelengths (e.g., white light), and an LED with a wide spread angle is used.

An anamorphic lens is used as the illumination lens 27. The illumination lens 27 has a stronger light-gathering effect in the vertical direction.

The guide light 18 emitted from the light source 14 passes through the spectral plate 15 on which the color-emitting elements 17 are formed, and is colored into upper and lower two-color guide light 18a and guide light 18b. Furthermore, the guide light 18 is more strongly focused in the vertical direction by the irradiation lens 27, and has an elliptical beam cross section with its major axis in the horizontal direction, and a boundary 18e extending in the horizontal direction is formed by the guide light 18a and the guide light 18b.

Therefore, the upper and lower guide lights 18a and 18b of two colors, as well as the boundary 18e, function as guide lights over a wide horizontal range.

As described above, the guide light irradiation device of the above embodiment uses a broadband light source that emits light in a broad band, and the necessary coloring of the guide light is performed by the spectral plate 15, so one light source 14 and one spectral plate 15 are sufficient, which significantly simplifies the configuration.

Figures 12(A), 12(B) and 13 show the fourth embodiment. Figure 12(A) is a schematic diagram showing the main parts of the optical system of the guide light emitting device 1, showing a plan view. In Figure 12(A), the upper side indicates the left and the lower side indicates the right. Figure 12(B) shows a cross section of the light beam of the irradiated guide light 18, and Figure 13 shows the coloring element 17 used in the fourth embodiment.

The fourth embodiment shows a case in which the guide light 18 forms a boundary 24e' over a wide area in the left-right (horizontal) direction.

The spectral plate 15 is shaped like a horizontally long rectangle, and the area is divided into two parts, upper and lower, along the short side. Color-producing elements 17 with different spectral transmittances are provided in the divided parts to form areas 24a and 24b. Areas 24a and 24b form a boundary 24e' that extends in the longitudinal direction (horizontal in this embodiment).

Three light sources 14a, 14b, and 14c are arranged facing the spectroscopic plate 15. Each of the light sources 14a, 14b, and 14c is a broadband light source that emits light having a broadband wavelength (e.g., white light) and is an LED with a spread angle α.

The optical axes 25a, 25b, and 25c of the light sources 14a, 14b, and 14c are radially arranged within the same horizontal plane that includes the boundary 24e'.

The optical axis 25a of the light source 14a is set parallel to the collimation optical axis of the total station 2 (see FIG. 1). The optical axis 25b is inclined upward at an angle of, for example, 30° with respect to the optical axis 25a, and the optical axis 25c is inclined downward at an angle of, for example, 30° with respect to the optical axis 25a. The inclination angle is not limited to 30°, but is set appropriately to 10°, 20°, etc. depending on the work environment.

With respect to the light source 14a, an irradiation lens 12a is disposed on the optical axis 25a of the light source 14a, and the color-producing element 17 and the light source 14a are set to be at or near the focal point of the irradiation lens 12a.

Similarly, for the light source 14b and the light source 14c, the irradiation lens 12b and the irradiation lens 12c are arranged on the optical axis 25b and the optical axis 25c, and the color-producing element 17 and the light source 14b and the light source 14c are set to be at or near the focal points of the irradiation lenses 12b and 12c, respectively.

When the light sources 14a, 14b, and 14c are turned on, the light emitted from each of the light sources 14a, 14b, and 14c passes through the color-emitting element 17 and is colored by the area 24a and the area 24b, respectively. Furthermore, each light is focused to a required spread angle by the projection lenses 12a, 12b, and 12c, and is irradiated as guide lights 18a, 18b, and 18c that are color-coded on the left and right. Furthermore, the guide lights 18a, 18b, and 18c are irradiated as a collective guide light 18.

Since the optical axes of the light sources 14a, 14b, and 14c are in a horizontal plane including the boundary 24e', the color boundary of the guide lights 18a, 18b, and 18c corresponding to the boundary 24e' is continuous horizontally. Therefore, the guide light 18 is irradiated as light of different colors above and below the horizontal boundary 24e'. In addition, the guide light 18 has a guide light spread angle of 60° + α in the left-right direction and a single guide light spread angle in the vertical direction.

Therefore, in the fourth embodiment, the guide light 18 can be emitted with a large horizontal spread angle. Furthermore, since the horizontal spread angle is obtained by arranging multiple light sources 14, there is no decrease in the light quantity or brightness due to the large spread angle of the guide light 18. Therefore, there is no loss of recognizability by the worker.

Furthermore, in the fourth embodiment, the light sources 14a, 14b, and 14c are provided close to one spectrometer plate 15, and the light sources 14a, 14b, and 14c are provided close to each other, so the light source unit does not become large.

In addition, in the fourth embodiment, the guide light 18 can be identified over a wide horizontal range, so that the surveyor will not lose sight of the guide light during surveying and installation work over a wide area. Furthermore, since a horizontal reference can be obtained by the guide light 18 over a wide horizontal range, the horizontal reference can be confirmed at multiple points simultaneously. Furthermore, by applying this to indoor construction work, a reference can be obtained for interior work.

In the fourth embodiment, the spread angle of the guide light 18 is increased in the left-right direction (horizontal direction), but it is also possible to increase the spread angle of the guide light 18 in the vertical direction.

Furthermore, in the fourth embodiment, a transmissive liquid crystal display may be used as the color-producing element, and if a transmissive liquid crystal display is used, the transmissive liquid crystal display may be made to form areas and the areas may be selectively made to blink, thereby enhancing the distinguishability of the areas.

Furthermore, an electrochromic material having two different spectral characteristics may be used as a coloring element, and the electrochromic material may function as an area forming means and a blinking means, forming an area and blinking one of the areas, thereby enhancing the distinguishability of the areas.

Furthermore, as a blinking means, a mechanical light-shielding shutter may be provided in one area of the spectrometer plate 15, and the blinking may be performed at periodic light-shielding intervals to enhance the distinguishability of the area.

The light sources 14a, 14b, and 14c, the spectrometer plate 15, and the illumination lenses 12a, 12b, and 12c may be integrally configured and rotatable about the horizontal axis (i.e., the optical axis 25a), making it possible to select the direction in which the guide light spreads depending on the working environment.

In the above explanation, the number of light sources 14 is 3, but it may be 2 or 4. Furthermore, the optical axis of the light source is inclined at a predetermined angle with respect to the adjacent optical axis, and the optical axes are inclined at a predetermined angle with respect to each other.

In the above embodiment, visible white light is used as the broadband light, and a white LED is used as the light source, but invisible light may be used as the broadband light, and an invisible LED may be used.

In this case, a light receiver is used that receives invisible guide light, and the light receiver is provided with a guide display unit that displays the results of receiving the guide light, and may also display instructions on the direction of movement based on the results of receiving the light. Also, the direction of movement may be guided to the survey worker by voice.

Furthermore, the receiver may be provided with a communication function with the total station 2, and the light receiving state may be communicated to the total station 2, and instructions to the worker may be displayed on the display unit of the total station 2. As a notification method in the total station 2, the LED of the indicator of the total station may be made to flash or emit continuous light to indicate the direction in which the survey worker should move, or the color of the indicator may be used to indicate the direction in which the survey worker should move.

Furthermore, it goes without saying that the fourth embodiment can also be applied to the modifications of the color-producing elements 17 shown in Figures 5 to 9, such as the modification of the division of the color-producing elements 17 and the formation of a gradation in which the color gradually changes.

FIG. 14 is an explanatory diagram showing an overview of the guide light irradiation device 1 according to the fifth embodiment, which is applied to a survey work site with an elevation difference.

The guide light irradiation device 1 is attached to the top surface of the total station 2, and the optical axis of the guide light irradiation device 1 is set parallel to the collimation optical axis of the total station 2.

In Figure 14, 3 indicates a pole on which a prism 4 is attached. Figure 14 shows the pole 3 installed at a survey point 5.

The total station 2 is installed at a known point, and the sighting direction is set to the survey point 5.

The guide light 7 is emitted from the guide light emitting device 1 toward the pole 3.

The guide light 7 expands vertically, and the cross section of the light beam is an ellipsoid with its major axis in the vertical direction. The guide light 7 is colored in different colors on the left and right sides, with the optical axis of the guide light 7 as the boundary. For example, when viewed from the guide light irradiation device 1 side, the right side 7a of the guide light 7 is blue light, and the left side 7b is red light. In the illustration, the boundary between the red light and the blue light is indicated by 7e.

When guiding a surveyor during survey work, if the surveyor recognizes the guide light 7 as blue, it can be determined that he is to the left of the survey point 5, and the worker is guided to the survey point by moving to the right (Figure 15 (A)).

In a survey work site with a difference in elevation, for example when there is a depression in the ground, when the worker moves across the depression, the worker also moves downward. In this embodiment, the guide light 7 expands both vertically, so even if the worker moves downward, the worker does not leave the irradiation range of the guide light 7 and guidance continues (Figure 15 (B)).

The fifth embodiment will be described with reference to Figures 16(A), 16(B), and 17.

Fig. 16(A) is a schematic diagram showing the main parts of the optical system of the guide light irradiation device 1. Note that Fig. 16(A) shows an elevational view of the optical system, with the upper side in the figure indicating the top, the lower side indicating the bottom, and the right side indicating the front.

In FIG. 16(A), 11 indicates a guide light irradiation optical system. The guide light irradiation optical system 11 has a plurality of light sources 14 and a plurality of irradiation lenses 12 corresponding to the light sources 14 on the optical axis 13 of the light sources 14.

In the fifth embodiment, three light sources 14a, 14b, and 14c are provided, and irradiation lenses 12a, 12b, and 12c are provided on the optical axes 13a, 13b, and 13c of the light sources 14a, 14b, and 14c, respectively. In addition, a common spectrometer 15 is provided between the light sources 14a, 14b, and 14c and the irradiation lenses 12a, 12b, and 12c, close to the light sources 14a, 14b, and 14c.

The light sources 14a, 14b, and 14c are provided so that the optical axes 13a, 13b, and 13c are positioned on the same vertical plane, and the light sources 14b and 14c are arranged symmetrically above and below the optical axis 13a. Furthermore, the optical axes 13b and 13c are inclined at a predetermined angle with respect to the optical axis 13a. Here, the optical axis 13a is set parallel to the collimation optical axis.

An irradiation lens 12a is provided on the optical axis 13a, and the optical axis of the irradiation lens 12a coincides with the optical axis 13a. The focal position of the irradiation lens 12a is set to be at the position of the spectrometer 15 or the position of the light source 14a, or near the position of the spectrometer 15 or near the position of the light source 14a. Note that the vicinity of the focal position of the irradiation lens 12a includes the focal position.

Similarly, irradiation lenses 12b and 12c are provided on the optical axes 13b and 13c, and the optical axes of the irradiation lenses 12b and 12c coincide with the optical axes 13b and 13c, respectively. In addition, the focal positions of the irradiation lenses 12b and 12c are set to be at the position of the spectroscopic plate 15 or the position of the light sources 14b and 14c, or near the position of the spectroscopic plate 15 or near the position of the light sources 14b and 14c.

FIG. 18 shows the basic configuration of the illumination lens, the spectroscopic plate, and the light source in the fifth embodiment, and shows a plan view of the portion related to the light source 14a in FIG. 16(A). Note that the light sources 14b and 14c are similar to the light source 14a, so a description thereof will be omitted.

The light source 14a is a broadband light source that emits light having a wide band of wavelengths, for example an LED that emits visible white light.

The spectral plate 15 has color elements 17 (17a, 17b) formed on the surface of a transparent substrate 16 (see FIG. 17), and the color elements 17 have optical characteristics in which the regions 17a, 17b on the left and right of a boundary 17e passing through the optical axis 13a have different spectral transmittances. For example, a dichroic film is used as the color elements 17. Furthermore, the boundary 17e, i.e., the boundary line, is set so as to be located on a vertical plane including the optical axes 13a, 13b, and 13c.

It is also possible to form no dichroic film on either one of the regions 17a and 17b, for example, on region 17b, or to form only an AR coating. In this case, the guide light will be two colors, blue light and white light.

In the above explanation, in FIG. 18, the color-developing element 17 is provided on the surface of the spectroscopic plate 15 facing the illumination lenses 12a to 12c, but it may be provided on the surface of the spectroscopic plate 15 facing the light source 14a.

The color-producing element 17 is a dichroic film, and for example, the spectral transmission wavelength of the right region 17a is 400 nm to 500 nm (blue), and the spectral transmission wavelength of the left region 17b is 650 nm to 750 nm (red).

The relationship between the spectral characteristics of the LED, the transmittance characteristics of the dichroic film in region 17a, and the spectral characteristics of the LED after passing through the dichroic film is as shown in Figure 4.

The color-producing element 17 is not limited to a dichroic film, and can be modified in various ways. For example, it can be an absorbing film that absorbs specific wavelengths, colored glass of a different color can be used, or a phosphor can be applied to change the wavelength, an EW element can be used, or a combination of a dichroic film and a phosphor can be used.

Furthermore, the color-producing element may be a transmissive liquid crystal display, and a blinking means may be provided to enhance distinguishability, as in the above-mentioned embodiment.

Next, the relationship between the light sources 14a, 14b, and 14c and the spectrometer 15 will be explained.

As described above, the light sources 14a, 14b, and 14c are arranged so that their optical axes are located on the same vertical plane, and further, the light sources 14b and 14c are arranged symmetrically above and below the optical axis 13a, and the optical axes 13b and 13c of the light sources 14b and 14c are inclined at a predetermined angle α above and below the optical axis 13a.

The spectrometer 15 has a rectangular shape that is elongated in the vertical direction, and has the region 17a and the region 17b on the left and right of the boundary 17e that extends in the longitudinal direction.

The light sources 14a, 14b, and 14c are disposed close to the spectrometer 15, and the white visible light 18a, 18b, and 18c emitted from the light sources 14a, 14b, and 14c passes through the spectrometer 15 and enters the illumination lenses 12a, 12b, and 12c, respectively.

The light beams 18a, 18b, and 18c are focused by the illumination lenses 12a, 12b, and 12c, respectively, at a predetermined spread angle β, and the light beams 18a, 18b, and 18c are collected and irradiated as guide light 18 having a boundary 18e.

The optical axis 13b and the optical axis 13c are inclined at a predetermined angle α with respect to the optical axis 13a, and the relationship between this inclination angle α and the spread angle β is set so that at least the light 18a and the light 18b, and the light 18a and the light 18c overlap partially, respectively, and no discontinuous portions of the light beam are generated between the light 18a, 18b and the light 18a, 18c when irradiated as the guide light 18.

In the fifth embodiment, the spread angle of the guide light 18 is 2×α+β in the vertical direction and β in the horizontal direction. The vertical length (length in the up-down direction) and horizontal length (width) of the spectrometer 15 are the lengths through which the light 18a, 18b, and 18c emitted from the light sources 14a, 14b, and 14c pass.

The inclination angle α and the spread angle β are appropriately determined according to the working environment. Also, in the above embodiment, the number of light sources is three, but it is not limited to three, and may be two or four or more.

In this embodiment, the guide light 18 can be emitted with a large spread angle in the vertical direction. Furthermore, since the spread angle in the vertical direction is obtained by arranging multiple light sources, there is no decrease in the light quantity or brightness due to the large spread angle of the guide light 18. Therefore, there is no loss of recognizability by the worker.

In addition, in the above embodiment, the guide light 18 is expanded in the vertical direction, but if it is expanded in the horizontal direction, the above configuration can be rotated 90° horizontally so that the optical axes 13a, 13b, 13c and the boundary 18e are included in the same horizontal plane.

In other words, the light sources 14a, 14b, and 14c, the spectrometer plate 15, and the irradiation lenses 12a, 12b, and 12c can be rotated 90° together.

Figures 19(A) and 19(B) show the sixth embodiment.

In the sixth embodiment, the arrangement of the light sources 14a, 14b, 14c and the illumination lenses 12a, 12b, 12c is the same as in the fifth embodiment, but the light splitter 15 is divided into small light splitters 15a, 15b, 15c, and each small light splitter 15a, 15b, 15c corresponds to the light sources 14a, 14b, 14c, respectively. The small light splitters 15a, 15b, 15c may have any shape, such as a rectangular plate or a circular plate, but in this embodiment they are rectangular plates.

Each of the small light-splitting plates 15a, 15b, and 15c is divided into left and right regions, and color-producing elements 17 (17a, 17b) with different spectral characteristics are formed in the left and right regions. In addition, the boundaries formed by each of the small light-splitting plates 15a, 15b, and 15c are set to be located on a vertical plane that includes the optical axes of the light sources 14a, 14b, and 14c.

By dividing the small light-splitting plates 15a, 15b, and 15c to correspond to the light sources 14a, 14b, and 14c, the small light-splitting plates 15a, 15b, and 15c need only be large enough to transmit the smallest part of the light beam diameter of the light 18a, 18b, and 18c, making it possible to miniaturize them.

In addition, by unitizing the light source 14a, the small light plate 15a, and the irradiation lens 12a into the guide light irradiation unit 19a (similarly unitizing the light sources 14b and 14c, the small light plates 15b and 15c, and the irradiation lenses 12b and 12c into the guide light irradiation units 19b and 19c), the degree of freedom in the configuration and arrangement of the guide light irradiation optical system 11 is increased.

As shown in FIG. 19(B), in the sixth embodiment, the light 18a, 18b, and 18c emitted from the light sources 14a, 14b, and 14c are collected and irradiated as guide light 18 having a boundary 18e.

FIGS. 20(A) and 20(B) show the main parts of the guide light irradiation optical system 11 of the seventh embodiment. In FIG. 20(A) and FIG. 20(B), the same reference numerals are used for the parts equivalent to those shown in FIG. 19(A) and FIG. 19(B), and the description thereof will be omitted.

In the fifth and sixth embodiments, the guide light 18 is transmitted through the spectral plate 15 to color the light, but in the seventh embodiment, the spectral plate 15 is a reflector, and coloring is performed by reflecting the light off the spectral plate 15. Also, FIG. 20(A) shows a case where two light sources 14a and 14b are included as light sources.

The light sources 14a and 14b are arranged symmetrically above and below the optical axis 13 of the guide light irradiation optical system 11. The optical axis 13 is set parallel to the collimation optical axis.

Small reflectors 31a and 31b are provided facing the light sources 14a and 14b, respectively, and irradiation lenses 12a and 12b are provided on the reflected light axes 32a and 32b of the small reflectors 31a and 31b, respectively. The small reflectors 31a and 31b constitute the spectrometer 15. The optical axes of the light sources 14a and 14b and the reflected light axes 32a and 32b are set to be located in the same vertical plane.

Since light sources 14a and 14b have the same configuration, the following will describe light source 14a.

A coloring element 17 is formed on the reflective surface of the small reflector 31a.

The coloring elements 17 (17a, 17b) have optical characteristics in which the regions 17a, 17b on the left and right of the boundary 18e passing through the optical axis 13 have different spectral transmittances (see FIG. 4). For example, a dichroic film is used as the coloring elements 17.

The color-producing element 17 is not limited to a dichroic film, but may be, for example, an absorbing film that absorbs a specific wavelength, or a phosphor coating that changes the wavelength.

Furthermore, it is not necessary to form a dichroic film on either one of the regions 17a and 17b, for example, on the region 17b. In this case, the guide light will be two colors, blue light and white light.

The white light emitted from the light source 14a is colored by being reflected by the color-emitting elements 17a and 17b, and is emitted as guide light 18a having a boundary 18e.

Similarly, for the light source 14b, guide light 18b having a boundary 18e is emitted from the irradiation lens 12b, and the upper and lower guide lights 18a and 18b are combined and irradiated as guide light 18.

Here, the boundary 17e between the color-producing elements 17a, 17b formed on the small reflectors 31a, 31b, respectively, is arranged to be located within a vertical plane including the optical axes of the light sources 14a, 14b and the reflected optical axes 32a, 32b. Therefore, in the collected guide light 18, the boundary 18e appears as a vertical straight line passing through the optical axis 13.

In the seventh embodiment, the light source 14a, the small reflector 31a, the irradiation lens 12a, and the light source 14b, the small reflector 31b, and the irradiation lens 12b may be unitized as the guide light irradiation unit 33a and the guide light irradiation unit 33b, respectively.

FIG. 21 shows a modified example of the color-producing element 17. In FIG. 21, the same reference numerals are used to designate the same parts as those shown in FIG. 17.

In this modified example, a gradation of color or brightness is provided to the color elements formed in areas 17a and 17b obtained by dividing the color element 17 into two parts, left and right.

Region 17a has a gradation where the color and brightness change gradually from the bottom to the top of the figure, while region 17b has a gradation where the color and brightness change gradually from the bottom to the top of the figure, the opposite to region 17a.

In addition, gradation can be achieved by, for example, giving a gradient to the thickness of the dichroic film.

The guide light 18 has a color gradation, allowing the surveyor to intuitively determine in which direction he or she should move by recognizing the color.

In the above embodiment, the color-producing element 17 is not limited to a dichroic film, but may be, for example, an absorbing film that absorbs a specific wavelength, or a phosphor coating that changes the wavelength.

Furthermore, as in the second embodiment, a reflective liquid crystal display may be used as the coloring element. Furthermore, a blinking means may be added to the liquid crystal display to partially blink the formed area, thereby enhancing the distinguishability of the area.

Furthermore, the spectrometer may be a digital micromirror device (DMD), and the digital micromirror device may be combined with a color-developing element to function as an area forming means and a blinking means, so that the digital micromirror device forms an area and causes the area to blink, improving identification.

The eighth embodiment will be described with reference to Figs. 22 to 25. In Figs. 22 to 25, the same reference numerals are used for the parts that are the same as those shown in Fig. 19.

The eighth embodiment shows a case where multiple light sources 14a, 14b, 14c, 14d, and 14e are arranged three-dimensionally. The light sources 14a, 14b, 14c, 14d, and 14e emit broadband light (for example, visible white light) as in the above-mentioned embodiments.

FIG. 22 is a front view, FIG. 23 is a view seen from the direction of arrow A in FIG. 22, and FIG. 24 is a view seen from the direction of arrow B in FIG. 22.

Light source 14a is arranged on optical axis 13a, and light sources 14b, 14c and light sources 14d, 14e are arranged symmetrically above, below and to the left and right of optical axis 13a. Optical axis 13a is set parallel to the collimation optical axis, and optical axis 13a is the reference optical axis in the eighth embodiment.

The optical axes 13b, 13c, 13d, and 13e of the light sources 14b, 14c, 14d, and 14e are inclined at a predetermined angle in the expansion direction with respect to the optical axis 13a.

Furthermore, the optical axes 13a, 13b, and 13c are configured to be included in the same vertical plane (vertical plane), and the optical axes 13a, 13d, and 13e are configured to be included in the same horizontal plane (horizontal plane).

First, regarding the light source 14a, the light source 14a, the small light plate 15a, and the irradiation lens 12a are arranged on the optical axis 13a, and the small light plate 15a and the light source 14a are provided near the focal position of the irradiation lens 12a. Note that either the light source 14a or the small light plate 15a may be provided at the focal position of the irradiation lens 12a.

The light source 14a, the small spectrometer 15a, and the irradiation lens 12a constitute the guide light irradiation unit 19a.

Similarly, for the light sources 14b, 14c, 14d, and 14e, small light dividing plates 15b, 15c, 15d, and 15e and irradiation lenses 12b, 12c, 12d, and 12e are provided on the optical axes 13b, 13c, 13d, and 13e, respectively, to form guide light irradiation units 19b, 19c, 19d, and 19e, respectively.

The small light-splitting plates 15a, 15b, 15c, 15d, and 15e will be described with reference to FIG. 24. The small light-splitting plates 15a, 15b, 15c, 15d, and 15e may have any shape, such as a rectangular plate or a circular plate, but in this embodiment, they are rectangular plates.

The small light-splitting plate 15a on the optical axis 13a is divided into four equal parts, vertically and horizontally, around the optical axis 13a, to form regions 35a, 35b, 35c, and 35d, and color-producing elements with different spectral characteristics are formed in each of the regions 35a, 35b, 35c, and 35d. For example, dichroic films with different spectral transmittances are formed as the color-producing elements.

The guide light emitted from the light source 14a passes through each of the areas 35a, 35b, 35c, and 35d of the small spectrometer 15a, and each area is colored in one of four colors. Furthermore, vertical and horizontal boundaries are formed at the boundaries of each area. The vertical boundaries are included in the vertical plane, and the horizontal boundaries are included in the horizontal plane. Furthermore, the intersection of the vertical and horizontal boundaries coincides with the optical axis 13a.

The small spectrophotometer 15b on the optical axis 13b is divided into left and right regions 36a and 36b with a vertical line passing through the optical axis 13b as the boundary, and dichroic films with different spectral transmittances are formed in each of the regions 36a and 36b.

Here, the spectral transmittance characteristics of the dichroic film formed in the region 36a are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35a. Also, the spectral transmittance characteristics of the dichroic film formed in the region 36b are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35b.

The guide light emitted from the light source 14b passes through each of the areas 36a and 36b of the small light plate 15b, and is colored in two colors for each area. The color of the light that passes through the area 36a matches the color of the light that passes through the area 35a. Furthermore, the color of the light that passes through the area 36b matches the color of the light that passes through the area 35b.

In addition, the vertical boundary line of the small splitter plate 15b coincides with the vertical boundary line formed by the small splitter plate 15a.

The small splitter plate 15c on the optical axis 13c is divided into left and right regions 37c and 37d by a vertical line passing through the optical axis 13c, and dichroic films with different spectral transmittances are formed in the regions 37c and 37d.

The spectral transmittance characteristics of the dichroic film formed in the region 37c are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35c. Also, the spectral transmittance characteristics of the dichroic film formed in the region 37d are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35d.

The guide light emitted from the light source 14c passes through each of the areas 37c and 37d of the small light plate 15c, and is colored in two colors for each area. The color of the light that passes through the area 37c matches the color of the light that passes through the area 35c. Furthermore, the color of the light that passes through the area 37d matches the color of the light that passes through the area 35d.

In addition, the vertical boundary line formed by the small light-splitting plate 15c coincides with the vertical boundary line formed by the small light-splitting plate 15a.

The small spectrophotometer 15d on the optical axis 13d is divided into upper and lower regions 38b and 38c with a horizontal line passing through the optical axis 13d as the boundary, and dichroic films with different spectral transmittances are formed in each of the regions 38b and 38c.

The spectral transmittance characteristics of the dichroic film formed in the region 38b are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35b. Also, the spectral transmittance characteristics of the dichroic film formed in the region 38c are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35c.

The guide light emitted from the light source 14d passes through each of the areas 38b and 38c of the small light plate 15d, and is colored in two colors for each area. The color of the light that passes through the area 38b matches the color of the light that passes through the area 35b. Furthermore, the color of the light that passes through the area 38c matches the color of the light that passes through the area 35c.

In addition, the horizontal boundary line formed by the small splitter plate 15d coincides with the horizontal boundary line formed by the small splitter plate 15a.

The small spectrophotometer 15e on the optical axis 13e is divided into upper and lower regions 39a and 39d with a horizontal line passing through the optical axis 13e as the boundary, and dichroic films with different spectral transmittances are formed in each of the regions 39a and 39d.

The spectral transmittance characteristics of the dichroic film formed in the region 39a are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35a. Also, the spectral transmittance characteristics of the dichroic film formed in the region 39d are made the same as the spectral transmittance characteristics of the dichroic film formed in the region 35d.

The guide light emitted from the light source 14e passes through each of the areas 39a and 39d of the small light plate 15e, and is colored in two colors for each area. The color of the light that passes through the area 39a matches the color of the light that passes through the area 35a. Furthermore, the color of the light that passes through the area 39d matches the color of the light that passes through the area 35d.

In addition, the horizontal boundary line formed by the small splitter plate 15e coincides with the horizontal boundary line formed by the small splitter plate 15a.

The guide light emitted from the guide light irradiation units 19b, 19c, 19d, and 19e is collected and irradiated from the guide light irradiation optical system 11 as a collected guide light 41. The collected state of the collected guide light 41 is shown in FIG. 25.

In the collective guide light 41, a vertical boundary 41a and a horizontal boundary 41b are formed, and the intersection of the boundary 41a and the boundary 41b coincides with the optical axis 13a. The optical axis 13a is parallel to the collimation optical axis.

If the four regions defined by the boundary 41a and the boundary 41b are the first quadrant 42a, the second quadrant 42b, the third quadrant 42c, and the fourth quadrant 42d, the first quadrant 42a is light colored by the regions 35a, 36a, and 39a. The second quadrant 42b is light colored by the regions 35b, 36b, and 38b. The third quadrant 42c is light colored by the regions 35c, 37c, and 38c. The fourth quadrant 42d is light colored by the regions 35d, 37d, and 39d.

The first quadrant 42a, the second quadrant 42b, the third quadrant 42c, and the fourth quadrant 42d are each a different color, so the boundaries 41a and 41b can be clearly identified, and the survey worker can recognize which quadrant he is in by recognizing the color of the collective guide light 41, and can determine the direction of movement.

Furthermore, by recognizing the change in color of the collective guide light 41, the boundaries 41a and 41b can be recognized, and the direction of movement toward the optical axis 13a can be recognized.

According to the eighth embodiment, the collective guide light 41 can be recognized over a wide range, and the horizontal and vertical movement directions can be recognized by distinguishing the colors. Furthermore, since the collective guide light 41 is formed by light from multiple light sources 14, a decrease in the amount of light and brightness is suppressed even when irradiated over a wide range, and the recognition ability of the surveyor is not impaired.

Furthermore, in the eighth embodiment, the light transmitted through the small light plates 15b, 15c, 15d, and 15e may be configured to form a gradation so that the direction of movement can be determined.

It goes without saying that the small light dividing plates 15a to 15e in the eighth embodiment can each be the reflector light dividing plates shown in the seventh embodiment.

Furthermore, it goes without saying that in the eighth embodiment, the coloring elements can be modified in various ways, just as in the above embodiments.

REFERENCE SIGNS LIST 1 Guide light irradiation device 2 Total station 3 Pole 11 Guide light irradiation optical system 12 Irradiation lens 13 Optical axis 14 Light source 15 Spectroscopic plate 17 Coloring element 18 Guide light 27 Irradiation lens 29 Reflector 41 Collective guide light

Claims (21)

A guide light irradiation device that irradiates guide light to indicate directions to surveying workers, the optical system of the guide light irradiation device includes an irradiation lens, a spectral plate, and a light source, the light source is a broadband light source that emits light in a broadband, a coloring element is provided on the spectral plate, the coloring element has at least two regions with different spectral characteristics, one of the spectral plate and the light source is configured to be located at or near the focal position of the irradiation lens, and the other is configured to be located near or at the focal position of the irradiation lens, the light emitted from the broadband light source is colored by the region, and the guide light irradiation device is configured to be irradiated from the irradiation lens as guide light containing at least two colors of light. The guide light irradiation device of claim 1, wherein the guide light irradiation optical system includes a plurality of light sources, the optical axes of the plurality of light sources are arranged in the same vertical or horizontal plane, the irradiation lens is provided on each of the optical axes in correspondence with the light source, the spectroscopic plate is provided between the irradiation lens and the light source, the boundary of the region is included in the plane, and the light emitted from the plurality of light sources is colored by the region, irradiated by the irradiation lens, and collected to be irradiated as guide light including at least two colors of light. The guide light irradiation device of claim 1 or claim 2, wherein the light source is a white LED that emits visible white light. The guide light irradiation device of claim 1 or claim 2, wherein the light source is an LED that emits invisible near-infrared light. The guide light irradiation device of claim 1 or claim 2, in which the color-developing elements are formed on a transparent substrate. The guide light irradiation device of claim 1 or claim 2, in which the coloring elements are formed on the reflecting surface of the reflector. The guide light irradiation device of claim 1 or claim 2, wherein the spectrometer has a blinking means and at least one of the regions can be made to blink. The guide light irradiation device of claim 1 or claim 2, wherein the spectroscopic plate includes a liquid crystal plate having optical transparency, and the liquid crystal plate is a coloring element that forms at least two regions with different spectroscopic characteristics. The guide light irradiation device of claim 7, wherein the liquid crystal plate is configured to be able to blink at least one of the regions. The guide light irradiation device of claim 1, wherein the color-producing element is divided into multiple areas vertically or horizontally. The guide light irradiation device of claim 6, wherein the color-producing element is further divided into two parts, left and right or top and bottom, and has multiple regions. The guide light irradiation device of claim 7, wherein the color-producing element is divided into two parts, an upper part and an lower part, each part having a plurality of regions, and the blinking means is configured to blink one of the upper and lower parts. The guide light irradiation device of claim 1, wherein the color-producing elements have a gradation in which the color changes gradually from one end to the other end. The guide light irradiation device of claim 5, in which the transparent substrate is rectangular and divided into two regions along the short side, and coloring elements having different spectral transmittances are provided in the divided portions to form two regions, and a boundary extending in the longitudinal direction of the transparent substrate is formed by the two regions, and a plurality of the light sources are provided within a plane including the boundary, and the optical axes of the light sources are inclined at a predetermined angle to each other. The guide light irradiation device of claim 1, wherein the irradiation lens is an anamorphic lens. The guide light irradiation device of claim 2, in which the spectral plate has an elongated rectangular shape through which light from the multiple light sources passes, the region is divided into two along the short side direction, and color-producing elements with different spectral characteristics are provided in the divided portion to form two regions, and the two regions form a boundary extending in the longitudinal direction of the transparent substrate, and the boundary is configured to be included within the plane. The guide light irradiation device of claim 2, in which the spectroscopic plate is made up of small spectroscopic plates arranged on the optical axes of the plurality of light sources in correspondence with the light sources, at least two regions are formed on the small spectroscopic plates, and coloring elements having different spectral transmittances are provided in each region, and the boundaries of the regions are configured to be included in the plane. The guide light irradiation device of claim 2, in which the optical axes of the light sources are inclined at a predetermined angle in the direction in which the irradiated light expands. The guide light irradiation device of claim 2, in which the guide light irradiation unit is constituted by the irradiation lens, the small spectrometer, and the light source arranged on the optical axis of the light source, and the guide light irradiation optical system is composed of a plurality of guide light irradiation units, one guide light irradiation unit has a reference optical axis parallel to the collimation direction, and the optical axes of the other guide light irradiation units are inclined at a predetermined angle with respect to the reference optical axis in the direction in which the irradiated light expands. The guide light irradiation device of claim 2, in which a guide light irradiation unit is formed by the irradiation lens, the small light plate, and the light source arranged on the optical axis of the light source, the guide light irradiation optical system is composed of five guide light irradiation units, one guide light irradiation unit has a reference optical axis parallel to the collimation direction, two guide light irradiation units are provided in a vertical plane including the reference optical axis and are symmetrical from top to bottom with respect to the reference optical axis, and two guide light irradiation units are provided in a horizontal plane including the reference optical axis and are symmetrical from left to right with respect to the reference optical axis, the guide light is formed by a collection of light emitted from the five guide light irradiation units, each of the small light plates is divided into regions and coloring elements are formed in the regions so that the guide light has a boundary included in the vertical plane and a boundary included in the horizontal plane. The guide light irradiation device according to any one of claims 16, 17, 19, and 20, in which the spectroscopic plate has a blinking means and at least one of the regions can be made to blink.

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