Guide light irradiation device

Abstract

A guide light irradiation device that emits guide light (16) to show a direction to a surveying worker, wherein an optical system of the guide light irradiation device includes an irradiation lens (15), an irradiation prism (14), and a light source (13), the light source is a broadband light source that emits light in a broad band, a coloring element (17) having two regions with different spectral characteristics is provided on a light incidence surface of the irradiation prism, the light emitted from the broadband light source enters the irradiation prism through the regions as guide light containing light of two colors, and the guide light is irradiated from the irradiation lens after being internally reflected at least twice inside the irradiation prism.

Description

Guide light irradiation device

[0001] The present invention relates to a guide light emitting device that emits guide light to guide an operator to a measurement point.

[0002] 2. Description of the Related Art In a surveying operation, a guide light emitting device that emits guide light is known as a device for guiding a surveying worker.

[0003] The guide light has different colors on the left and right sides of the collimation axis, and is irradiated toward the staking point. The staking worker visually recognizes the guide light and distinguishes the color to determine the direction of movement, and by moving to the boundary position between the left and right colors, he is guided to the staking point.

[0004] Conventionally, a guide light emitting device has two light sources and a right-angle mirror arranged opposite each other. 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 having a boundary. An example of such a guide light emitting device is disclosed in Patent Document 1.

[0005] Conventional guide light emitting devices have an irradiation lens for converting the guide light into a parallel beam or a beam with a predetermined divergence angle, which requires a certain focal length for the irradiation lens, resulting in an increase in the size of the optical system.

[0006] Japanese Patent Application Laid-Open No. 2020-165839

[0007] The present invention provides a guide light irradiating device that allows for miniaturization of the optical system and the entire device.

[0008] The present invention relates to a guide light emitting device that emits guide light to show directions to surveying workers, wherein the optical system of the guide light emitting device includes an illumination lens, an illumination prism, and a light source, the light source being a broadband light source that emits light over a wide band, and a coloring element having two regions with different spectral characteristics is provided on the incident surface of the illumination prism, and the light emitted from the broadband light source enters the illumination prism via the regions as guide light containing light of two colors, and the guide light is internally reflected at least twice within the illumination prism before being irradiated from the illumination lens.

[0009] The present invention also relates to the guide light irradiating device, wherein the light source is a white LED that emits white visible light.

[0010] The present invention also relates to a guide light irradiation device in which the coloring element is a dichroic film evaporated onto the incident surface of the irradiation prism.

[0011] The present invention also relates to a guide light irradiation device in which the irradiation prism is configured so that at least one surface reflects the guide light incident at an angle equal to or greater than the critical angle and transmits the guide light incident at a right angle.

[0012] The present invention also relates to a guide light irradiating device in which the irradiation prism has a chamfered portion formed outside the optical path of the guide light.

[0013] The present invention also relates to a guide light irradiating device in which the color-producing element is a liquid crystal display.

[0014] Furthermore, the present invention relates to a guide light irradiating device in which a flashing means is added to the coloring element, and at least one of the divided surfaces can be flashed by the flashing means.

[0015] According to the present invention, there is provided a guide light irradiation device that emits guide light to show directions to surveying workers, wherein the optical system of the guide light irradiation device includes an irradiation lens, an irradiation prism, and a light source, the light source is a broadband light source that emits light over a wide band, and a coloring element having two regions with different spectral characteristics is provided on the incident surface of the irradiation prism, and the light emitted from the broadband light source enters the irradiation prism via the regions as guide light containing light of two colors, and the guide light is configured to be irradiated from the irradiation lens after being internally reflected at least twice within the irradiation prism, so that the length in the optical axis direction of the guide light can be shortened, thereby enabling the miniaturization of the optical system and the entire device to be achieved.

[0016] FIG. 1 is an explanatory diagram showing an overview of a guide light emitting device according to a first embodiment. FIG. 2 is an explanatory diagram showing the main parts of the guide light emitting section of the guide light emitting device. FIG. 3 is a plan view of a coloring element. 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 the main parts of the guide light emitting section of a guide light emitting device according to a second embodiment. FIG. 6 is an explanatory diagram showing the main parts of the guide light emitting section of a guide light emitting device according to a third embodiment. FIG. 7 is an explanatory diagram showing the main parts of the guide light emitting section of a guide light emitting device according to a fourth embodiment.

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] 1 is an explanatory diagram showing an overview of a guide light emitting device 1 according to this embodiment, and shows a state in which the guide light emitting device 1 is attached to the upper surface of a surveying instrument 2, for example, a total station. The optical axis of the guide light emitting device 1 is set parallel to the collimation optical axis of the surveying instrument 2.

[0019] 1, reference numeral 3 denotes a pole on which a prism 4 is mounted. In addition, FIG. 1 shows the state in which the pole 3 is installed at a staking point 5. The surveying device 2 is installed at a known point, and the collimation direction is set to the staking point 5.

[0020] FIG. 2 is a schematic side view showing a main part of the optical system of the guide light emitting device 1. As shown in FIG.

[0021] 2, reference numeral 11 denotes a guide light irradiator, and the guide light irradiator 11 has a guide light axis 12. The guide light irradiator 11 also has, in order from the light-emitting side, a light source 13 provided on the guide light axis 12, an irradiation prism 14, and an irradiation lens 15 provided on the reflected light axis of the irradiation prism 14. The guide light axis 12 and the guide light axis 12 reflected by the irradiation prism 14 are collectively referred to as the guide light axis 12.

[0022] The light source 13 is a broadband light source having a wide band of wavelengths, and is, for example, an LED that emits white light in the visible light range as the guide light 16 .

[0023] The illumination prism 14 is, for example, a pentagonal prism, and is configured to internally reflect the guide light 16 at least twice and deflect it in a desired direction.

[0024] The illumination lens 15 is configured to convert the guide light 16 emitted from the light source 13 located at the focal position of the illumination lens 15 into a parallel beam or an approximately parallel beam (a beam having a predetermined divergence angle).

[0025] Next, details of the illumination prism 14 will be described. The illumination prism 14 faces the light source 13 and has a first surface 14a onto which white light from the light source 13 is incident as guide light 16 via a color-producing element 17 (described later), a second surface 14b onto which the guide light 16 transmitted through the first surface 14a is incident, a third surface 14c onto which the guide light 16 internally reflected by the second surface 14b is incident, a fourth surface 14d onto which the guide light 16 reflected by the third surface 14c is incident, and a fifth surface 14e formed between the second surface 14b and the third surface 14c.

[0026] The first surface 14a is configured to be perpendicular to the guide light axis 12, and the guide light 16 is incident at a right angle, that is, an incident angle of 0°, on the first surface 14a.

[0027] The second surface 14b faces the first surface 14a and is inclined in a direction away from the first surface 14a from left to right in Fig. 2. That is, the second surface 14b is configured to reflect the guide light 16 incident on the second surface 14b in a direction away from the illumination lens 15.

[0028] The third surface 14c extends downward from the right end of the first surface 14a. The angle formed between the first surface 14a and the third surface 14c is an obtuse angle, and the third surface 14c is inclined downward in a direction away from the illumination lens 15. Therefore, the third surface 14c is configured to reflect the guide light 16 reflected by the second surface 14b toward the illumination lens 15.

[0029] The fourth surface 14d faces the third surface 14c, extends downward from the left end of the first surface 14a, and is perpendicular to the guide light axis 12 reflected by the third surface 14c. Therefore, the fourth surface 14d is configured so that the guide light 16 is incident at a right angle, that is, an incident angle of 0°, and is emitted from the illumination prism 14. That is, the fourth surface 14d serves as an emission surface for the guide light 16.

[0030] The color-producing elements 17 are formed on the first surface 14a of the irradiation prism 14. The color-producing elements 17 are located on the optical path of the white light and are larger than the luminous flux of the white light. Therefore, the white light passes through the color-producing elements 17 on its way to the first surface 14a, and the white light that has passed through the color-producing elements 17, i.e., the guide light 16, is incident on the first surface 14a.

[0031] 3, the coloring element 17 has optical characteristics in which the spectral transmittance differs between regions 17a and 17b on the left and right of a boundary 17e through which the guide optical axis 12 passes. As the coloring element 17, for example, a dichroic film vapor-deposited on the first surface 14a is used.

[0032] In FIG. 2, the light source 13 is provided at the focal position of the irradiation lens 15, and the color-emitting element 17 is provided near the focal position, but the color-emitting element 17 may be provided at the focal position of the irradiation lens 15, and the light source 13 may be provided near the focal position.

[0033] The color-producing element 17 is a dichroic film, and the spectral transmission wavelength of the left region 17a is set to 400 nm to 500 nm (blue), and the spectral transmission wavelength of the right region 17b is set to 650 nm to 750 nm (red).

[0034] 4 shows an example of the relationship between the spectral characteristics of the guide light 16, the transmittance characteristics of the dichroic film in the left region 17a, and the spectral characteristics of the guide light 16 after passing through the dichroic film. In FIG. 4, a solid line A indicates the spectral characteristics of the white light emitted from the light source 13, i.e., the guide light 16, a dashed line B indicates the transmittance characteristics of the dichroic film, and a dashed line C indicates the spectral characteristics of the guide light 16 after passing through the dichroic film.

[0035] The dichroic film in the left region 17a has a transmittance characteristic of transmitting light with wavelengths of 400 nm to 500 nm, so the guide light 16a transmitted through the left region 17a is blue light. Although not shown, if the dichroic film in the right region 17b has a transmittance characteristic of 650 nm to 750 nm, the guide light 16b transmitted through the right region 17b is red light.

[0036] The white light emitted from the light source 13 passes through the color-producing element 17 while entering the irradiation prism 14. The white light that passes through the left region 17a becomes the blue guide light 16a, and the white light that passes through the right region 17b becomes the red guide light 16b. Therefore, the white light enters the first surface 14a of the irradiation prism 14 as the two-color guide light 16 consisting of the blue guide light 16a and the red guide light 16b across the boundary 16e.

[0037] The guide light 16 incident on the first surface 14a is successively internally reflected by the second surface 14b and the third surface 14c. The guide light 16 reflected by the third surface 14c is incident on the fourth surface 14d at a right angle (at an incident angle of 0°) and is emitted from the illumination prism 14. That is, the guide light 16 is internally reflected twice within the illumination prism 14.

[0038] The guide light 16 emitted from the irradiation prism 14 passes through the irradiation lens 15 and is irradiated onto the measurement point 5 as the guide light 16 in the form of a parallel or approximately parallel beam.

[0039] The guide light 16 irradiated to the staking point 5 is configured such that the blue guide light 16 a is on the left side and the red guide light 16 b is on the right side, and the boundary 16 e indicates the position of the guide light axis 12 .

[0040] In guiding the staking and setting worker during staking and setting work, if the staking and setting worker recognizes the guide light 16 as red, it can be determined that he is to the right of the staking and setting point 5, and the worker can be guided to the staking and setting point 5 by moving leftward. Similarly, if the staking and setting worker recognizes the guide light 16 as blue, it can be determined that he is to the left of the staking and setting point 5, and the worker can be guided to the staking and setting point 5 by moving rightward. The staking and setting work is carried out until the staking and setting worker recognizes the guide light 16 as two colors, red and blue.

[0041] In this embodiment, the left region 17a and the right region 17b are formed with dichroic films having different transmittance characteristics. On the other hand, either the left region 17a or the right region 17b, for example, the right region 17b may not be formed with a dichroic film or may be formed with only an AR (Anti-Reflection) coating. In this case, the guide light 16 becomes two-color light consisting of blue guide light 16a and white guide light 16b.

[0042] As described above, in the first embodiment, the guide light irradiating unit 11 has the irradiation prism 14, and the irradiation prism 14 is configured to internally reflect the guide light 16 twice, and then deflect the guide light 16 in a direction parallel to the collimation optical axis of the surveying instrument 2.

[0043] Therefore, the length of the guide light emitting unit 11 in the direction parallel to the collimation optical axis can be shortened, and there is no need to secure space equivalent to the focal length of the irradiation lens 15 in the direction parallel to the collimation optical axis, so that the optical system of the guide light emitting unit 11 can be made smaller, and the entire guide light emitting device 1 can be made smaller.

[0044] In the first embodiment, the color-producing element 17 , which is, for example, a dichroic film, generates the two-color guide light 16 from the broadband white light emitted from the single light source 13 .

[0045] Therefore, since there is no need to use two light sources to generate the guide light 16 of two colors, the number of parts can be reduced, and the manufacturing cost can be reduced.

[0046] Furthermore, since a dichroic film vapor-deposited on the first surface 14a of the irradiation prism 14 is used as the color-producing element 17, there is no need to separately use a spectroscopic plate or the like vapor-deposited with a dichroic film, which reduces the number of parts and the manufacturing cost.

[0047] Next, a second embodiment of the present invention will be described with reference to Fig. 5. In Fig. 5, the same components as those in Fig. 2 are designated by the same reference numerals, and their description will be omitted.

[0048] The illumination prism 18 according to the second embodiment is a pentagonal prism having a first surface 18a facing the light source 13, a second surface 18b onto which the guide light 16 transmitted through the first surface 18a is incident, a third surface 18c onto which the guide light 16 internally reflected by the second surface 18b is incident, a fourth surface 18d onto which the guide light 16 internally reflected by the third surface 18c is incident, and a fifth surface 18e formed between the second surface 18b and the fourth surface 18d.

[0049] The first surface 18a is disposed so as to be perpendicular to the guide light axis 12, and coloring elements 17 are formed on the surface thereof, which are larger than the luminous flux of white light that is perpendicularly incident on the first surface 18a at an incident angle of 0°. Therefore, the white light incident on the first surface 18a passes through the coloring elements 17 on its way to the first surface 18a, and becomes two-color guide light 16. In other words, the first surface 18a serves as the incident surface for the guide light 16.

[0050] The second surface 18b faces the first surface 18a and is inclined from left to right in Fig. 5 in a direction approaching the first surface 18a. That is, the second surface 18b is configured to reflect the guide light 16 incident on the second surface 18b in a direction approaching the illumination lens 15.

[0051] The third surface 18c is continuous with the left end of the first surface 18a and extends downward. The angle formed between the first surface 18a and the third surface 18c is an obtuse angle, and the third surface 18c is disposed so as to be perpendicular to the guide optical axis 12 of the guide light 16 incident on the illumination lens 15. Furthermore, an AR coating is vapor-deposited over the entire surface of the third surface 18c, and the guide light 16 reflected by the second surface 18b and incident at an incident angle equal to or greater than the critical angle is totally reflected toward the fourth surface 18d, i.e., in a direction away from the illumination lens 15.

[0052] The fourth surface 18d is continuous with the right end of the first surface 18a and extends downward. The angle formed between the first surface 18a and the fourth surface 18d is an obtuse angle, and the fourth surface 18d is inclined downward in a direction away from the irradiation lens 15. Therefore, the fourth surface 18d is configured to reflect the guide light 16 toward the irradiation lens 15 so that the incident guide light 16 is perpendicularly incident on the third surface 18c at an incident angle of 0°. In the second embodiment, the third surface 18c serves as the exit surface for the guide light 16.

[0053] In the second embodiment, the illumination prism 18 is configured so that the guide light 16 incident on the first surface 18a, which is the entrance surface, is internally reflected by the second surface 18b, the third surface 18c, and the fourth surface 18d in sequence, and then emitted from the third surface 18c, which is the exit surface, parallel to the collimation optical axis of the surveying instrument 2.

[0054] In the second embodiment, the guide light 16 is configured to be internally reflected three times within the irradiation prism 18. Therefore, the distance in the direction parallel to the collimation optical axis of the guide light irradiating unit 11 can be further shortened, and the optical system of the guide light irradiating unit 11 and the guide light irradiating device 1 can be further miniaturized.

[0055] Furthermore, since the fifth surface 18e is located outside the optical path of the guide light 16, it can be regarded as a chamfered portion formed at the corner formed by the second surface 18b and the fourth surface 18d, and the length of the guide light irradiating portion 11 in the direction parallel to the collimation optical axis, i.e., the length in the irradiation direction of the guide light 16, can be further shortened.

[0056] Next, a third embodiment of the present invention will be described with reference to Fig. 6. In Fig. 6, the same components as those in Fig. 2 are given the same reference numerals, and the description thereof will be omitted.

[0057] The illumination prism 19 according to the third embodiment is a pentagonal prism having a first surface 19a facing the light source 13, a second surface 19b onto which the guide light 16 transmitted through the first surface 19a is incident, a third surface 19c onto which the guide light 16 internally reflected by the second surface 19b is incident, a fourth surface 19d onto which the guide light 16 internally reflected by the third surface 19c and the second surface 19b in turn is incident, and a fifth surface 19e formed between the third surface 19c and the fourth surface 19d.

[0058] The first surface 19a is disposed so as to be perpendicular to the guide optical axis 12, and has coloring elements 17 formed on its surface, the coloring elements 17 being larger than the luminous flux of white light incident on the first surface 19a. The white light incident on the first surface 19a passes through the coloring elements 17 before entering the first surface 19a, and becomes two-color guide light 16.

[0059] The second surface 19b extends downward from the left end of the first surface 19a. The angle formed between the first surface 19a and the second surface 19b is an acute angle, and the second surface 19b is disposed so as to be perpendicular to the guide light axis 12 of the guide light 16 incident on the illumination lens 15. Furthermore, the second surface 19b is vapor-deposited with an AR coating over the entire surface, so that the guide light 16 that has passed through the first surface 19a and is incident at an angle equal to or greater than the critical angle is totally reflected toward the third surface 19c, and the guide light 16 that has been reflected by the third surface 19c and is incident at an angle equal to or greater than the critical angle is totally reflected toward the fourth surface 19d.

[0060] The third surface 19c extends from the lower end of the second surface 19b toward the right side. The angle formed between the second surface 19b and the third surface 19c is an acute angle, and the third surface 19c is inclined from the left side to the right side in Fig. 6 in a direction approaching the light source 13. Therefore, the third surface 19c is configured to reflect the guide light 16 reflected by the second surface 19b again toward the second surface 19b.

[0061] The fourth surface 19d extends downward from the right end of the first surface 19a. The angle formed between the first surface 19a and the fourth surface 19d is an obtuse angle, and the fourth surface 19d is inclined downward in a direction away from the illumination lens 15. The fourth surface 19d is configured so that the guide light 16 reflected by the second surface 19b is reflected toward the second surface 19b so that the guide light 16 is incident on the second surface 19b at a right angle (an incident angle of 0°). In the third embodiment, the second surface 19b serves as the exit surface for the guide light 16.

[0062] The illumination prism 19 in the third embodiment is configured so that the guide light 16 incident on the first surface 19a, which is an incident surface, is internally reflected by the second surface 19b, the third surface 19c, the second surface 19b, and the fourth surface 19d in this order, and then emitted from the second surface 19b, which is an exit surface, in a direction parallel to the collimation optical axis of the surveying instrument 2. In other words, the guide light 16 is configured to be internally reflected four times within the illumination prism 19.

[0063] Therefore, the distance in the direction parallel to the collimation optical axis of the guide light emitting unit 11 can be further shortened, and the optical system of the guide light emitting unit 11 and the guide light emitting device 1 can be further miniaturized.

[0064] Next, a fourth embodiment of the present invention will be described with reference to Fig. 7. In Fig. 7, the same components as those in Fig. 2 are designated by the same reference numerals, and their description will be omitted.

[0065] The illumination prism 21 according to the fourth embodiment is a pentagonal prism having a first surface 21a facing the light source 13, a second surface 21b onto which the guide light 16 transmitted through the first surface 21a is incident, a third surface 21c onto which the guide light 16 internally reflected by the second surface 21b is incident, a fourth surface 21d that internally reflects the guide light 16 internally reflected by the third surface 21c toward the third surface 21c, and a fifth surface 21e formed between the first surface 21a and the fourth surface 21d.

[0066] The first surface 21a is disposed perpendicular to the guide light axis 12, and color-producing elements 17 larger than the luminous flux of the white light incident on the first surface 21a are formed on the optical path of the white light, with a reflective film deposited on the areas other than where the color-producing elements 17 are formed. The white light incident on the first surface 21a passes through the color-producing elements 17 on its way to the first surface 21a, becoming two-color guide light 16. Furthermore, the first surface 21a is configured to reflect the guide light 16 toward the third surface 21c so that the guide light 16 reflected by the third surface 21c is incident on the third surface 21c at a right angle (0°). In the fourth embodiment, the first surface 21a serves as the incident surface for the guide light 16.

[0067] The second surface 21b extends from the upper end of the first surface 21a toward the left side in Fig. 7. The angle formed between the first surface 21a and the second surface 21b is an acute angle, and the second surface 21b is inclined downward from the right side to the left side in Fig. 7.

[0068] The third surface 21c extends downward from the left end of the second surface 21b. The angle between the second surface 21b and the third surface 21c is an obtuse angle, and the third surface 21c is disposed so as to be perpendicular to the guide light axis 12 incident on the illumination lens 15. Furthermore, the third surface 21c is entirely coated with an AR coating, so that the guide light 16 reflected by the second surface 21b and incident at an angle equal to or greater than the critical angle is totally reflected toward the fourth surface 21d, the guide light 16 reflected by the fourth surface 21d and incident at an angle equal to or greater than the critical angle is totally reflected toward the first surface 21a, and the guide light 16 reflected by the first surface 21a and incident at a right angle (0°) is transmitted. In the fourth embodiment, the third surface 21c serves as the exit surface for the guide light 16.

[0069] The fourth surface 21d extends from the lower end of the third surface 21c toward the right side in Fig. 7. The angle between the third surface 21c and the fourth surface 21d is an acute angle, and the fourth surface 21d is inclined upward from the left side to the right side. Therefore, the fourth surface 21d is configured to reflect the guide light 16 reflected by the third surface 21c back toward the third surface 21c.

[0070] The illumination prism 21 in the fourth embodiment is configured so that the guide light 16 incident on the first surface 21a, which is an incident surface, is internally reflected by the second surface 21b, the third surface 21c, the fourth surface 21d, the third surface 21c, and the first surface 21a in this order, and then emerges from the third surface 21c, which is an exit surface, in a direction parallel to the collimation optical axis of the surveying instrument 2. In other words, the guide light 16 is internally reflected five times within the illumination prism 21.

[0071] Therefore, the distance in the direction parallel to the collimation optical axis of the guide light emitting unit 11 can be further shortened, and the optical system of the guide light emitting unit 11 and the guide light emitting device 1 can be further miniaturized.

[0072] The color-producing element may be a dichroic film, a wavelength absorbing film, colored glass, a fluorescent film, or an EW element. Furthermore, the color-producing element may be a transmissive liquid crystal display, such as a transmissive organic EL display, a transmissive inorganic EL display, or a transmissive liquid crystal display.

[0073] Furthermore, in order to enhance the distinguishability, the coloring element may be provided with a flashing means, and the flashing means may be configured to flash at least one of the divided surfaces. When a transmissive liquid crystal display is used, the flashing means may be configured to flash an area where a liquid crystal display driver is formed.

[0074] Alternatively, an area may be made of electrochromic material having two different spectral characteristics, and the area may be made to blink so that the area can be identified.

[0075] Furthermore, a mechanical light-shielding shutter may be provided on the spectroscopic plate as a blinking means, and the regions may be blinked at periodic light-shielding intervals to enhance the discrimination of the regions.

[0076] REFERENCE SIGNS LIST 1 guide light irradiation device 2 surveying device 5 measurement point 11 guide light irradiation unit 13 light source 14 irradiation prism 15 irradiation lens 16 guide light 17 coloring element 18 irradiation prism 19 irradiation prism 21 irradiation prism

Claims

1. A guide light irradiation device that emits guide light to show direction to surveying workers, the optical system of the guide light irradiation device including an irradiation lens, an irradiation prism, and a light source, the light source being a broadband light source that emits light in a broad band, the incident surface of the irradiation prism being provided with a coloring element having two regions with different spectral characteristics, the light emitted from the broadband light source entering the irradiation prism through the regions as guide light containing light of two colors, the guide light being internally reflected at least twice within the irradiation prism before being irradiated from the irradiation lens.

2. The guide light emitting device according to claim 1, wherein the light source is a white LED that emits visible white light.

3. The guide light irradiation device according to claim 1, wherein the color-developing element is a dichroic film evaporated onto the incident surface of the irradiation prism.

4. The guide light emitting device according to claim 1, wherein the irradiation prism has at least one surface that reflects the guide light incident at an angle equal to or greater than the critical angle and transmits the guide light incident at a right angle.

5. The guide light irradiating device according to claim 1, wherein the irradiation prism has a chamfered portion formed outside the optical path of the guide light.

6. The guide light emitting device according to claim 1, wherein the color-developing element is a liquid crystal display.

7. The guide light emitting device according to claim 1, further comprising a blinking means attached to said coloring element, said blinking means enabling at least one of said divided surfaces to blink.

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