JP6271884B2 - Illumination device, illumination system, imaging illumination device, and imaging system - Google Patents

Description

  The present invention relates to an illuminating device, an illuminating system, an imaging illuminating device, and an imaging system, and more particularly to an illuminating device, an illuminating system, an imaging illuminating device, and an imaging system that can change an irradiation area by adjusting an irradiation angle of irradiation light. .

  2. Description of the Related Art Conventionally, there is known an illumination device that includes a light source and an optical element and emits light emitted from the light source via the optical element. For example, an illumination device disclosed in Patent Document 1 includes a light emitting unit that uses a plurality of light emitting diodes as light sources, and an optical lens unit that is disposed in front of the light emitting unit and controls light emitted from the plurality of light emitting diodes. And a light distribution variable mechanism configured to change the light distribution of the light transmitted through the optical lens unit by changing the separation distance between the light emitting unit and the optical lens unit.

  According to the illumination device described in Patent Literature 1, the light distribution variable mechanism changes the separation distance between the light emitting unit and the optical lens unit, thereby changing the light distribution of the light transmitted through the optical lens unit. Specifically, when the optical lens unit is configured by a convex condensing lens, when the distance between the lens unit and the light emitting unit increases, the light emitted from the light emitting unit converges, and the distance decreases. The emitted light is diffused. Thus, according to the illuminating device described in Patent Document 1, it is possible to change light distribution characteristics such as convergence or diffusion of irradiation light.

  Further, the focal position scanning unit used in the interferometric film pressure gauge disclosed in Patent Document 2 scans the focal position of the light emitted from the light projecting unit within a predetermined range, and is disposed in the optical path. Each of the two wedge substrates has the same wedge angle, and the inclined surfaces are opposed to each other, and the two wedge substrates are moved so as to change the total thickness of the two wedge substrates. According to the focal position scanning unit described in Patent Document 2, the common focal position can be changed by moving the wedge substrate by the drive mechanism so that the total thickness of the wedge substrates positioned in the optical path is changed.

JP 2004-355934 A JP 2013-88358 A

  However, the illumination device described in Patent Document 1 described above can change the irradiation range by focusing or diffusing the irradiation light by changing the separation distance between the light emitting unit and the optical lens unit. The irradiation angle cannot be changed. In other words, the irradiation area cannot be partially expanded or reduced in accordance with the position of the irradiated object in the irradiation area of the irradiated light.

  Therefore, for example, when the illumination device is used in an imaging device or the like that is fixed and used at a specific location such as a monitoring camera, the irradiation light depends on the distance from the object to be irradiated on the optical axis. The irradiation range can be changed by focusing or diffusing, but in order to irradiate the object to be irradiated at a position shifted from the optical axis, illumination that partially expands or reduces the irradiation region is performed. I can't. Therefore, an illuminating device employed in an imaging device fixed in a specific location such as a surveillance camera must always irradiate light with sufficient brightness over the entire photographing range. In order to irradiate irradiation light with sufficient brightness over the entire photographing range, it is necessary to irradiate irradiation light in areas other than necessary areas, and an increase in power consumption cannot be avoided. Further, depending on the position of the subject, there is a problem that the amount of irradiation light is insufficient.

  Moreover, even if the configuration described in Patent Document 2 described above is adopted as an illumination device such as a monitoring camera, the configuration described in Patent Document 2 is driven so that the total thickness of the wedge substrates located in the optical path changes. Since the focal position of the light is changed by moving by the mechanism, in order to irradiate the object to be irradiated at the position shifted from the optical axis as in the above-described Patent Document 1, Illumination that partially expands or contracts the irradiation area cannot be performed.

  Accordingly, an object of the present invention is to provide an illumination device, an illumination system, and an imaging illumination device that can partially expand or contract an irradiation area by adjusting an irradiation angle of irradiation light according to an illumination request with a simple configuration. To provide an apparatus and an imaging system.

  As a result of intensive studies, the inventors of the present invention have solved the above-mentioned problems by adopting the following configuration.

  The illumination device according to the present invention can change the irradiation area by adjusting the irradiation angle of the irradiation light from the light source by the optical element arranged along the virtual vertical plane with respect to the light irradiation direction from the light source. And a moving means for moving the optical element relative to the light source along the vertical plane to adjust the position where the light emitted from the light source is incident on the incident surface of the optical element. Features.

  In the illumination device according to the present invention, it is preferable that the optical element is a light focusing unit having a positive refractive power or a light diffusion unit having a negative refractive power.

  The illumination device according to the present invention can change the irradiation area by adjusting the irradiation angle of the irradiation light from the light source by the optical element arranged along the virtual vertical plane with respect to the light irradiation direction from the light source. The optical element is disposed along a virtual vertical plane with respect to the direction of light irradiation from the light source, and disposed on the light exit side of the first light refracting means, and the first light refracting means. Second light refracting means having a different refractive index, and the exit surface of the first light refracting means and the incident surface of the second light refracting means are virtual vertical surfaces with respect to the light irradiation direction from the light source. The second light refracting means is an inclined surface having a predetermined angle, and the second light refracting means is moved in parallel with the first light refracting means with respect to the exit surface of the first light refracting means. Adjust the emission position of the light emitted from the exit surface Characterized in that it comprises a moving means.

  Moreover, the illumination device according to the present invention can change the irradiation area by adjusting the irradiation angle of the irradiation light from the light source by the optical element arranged along the virtual vertical plane with respect to the light irradiation direction from the light source. The optical element is disposed along a virtual vertical plane with respect to the direction of light irradiation from the light source, and is disposed on the light emitting side of the first light refracting means. A second light refracting means having a refractive index similar to that of the refracting means and having an exit surface having a predetermined curved shape, and the exit surface of the first light refracting means and the incidence of the second light refracting means The surface is an inclined surface that forms a predetermined angle with a virtual vertical surface with respect to the direction of light irradiation from the light source, and the second light refracting unit is set to the exit surface of the first light refracting unit with respect to the first light refracting unit. In parallel with the second light refraction means. Characterized in that it comprises a moving means for adjusting the output position of light emitted from the morphism surface.

  In the above-described illumination device according to the present invention, it is preferable that the first and second light refracting means are light focusing means having a positive refractive power or light diffusing means having a negative refractive power.

  The illumination system according to the present invention is characterized in that a plurality of the illumination devices described above are arranged along a virtual vertical plane with respect to the direction of light irradiation from the light source.

  Further, in the illumination system according to the present invention, two of the above-described illumination devices are arranged along a virtual vertical plane with respect to the light irradiation direction from the light source, and each lighting device has a light irradiation direction from the light source. And the first refracting means and the second refracting means of each lighting device are mirror-symmetric with respect to each other with a mirror surface including a midpoint of a straight line connecting between the light source centers of each lighting device. It is characterized by.

  Moreover, as for the illumination system concerning this invention, it is more preferable to provide multiple sets of the illuminating devices which comprise the above-mentioned illumination system.

  Further, the imaging illumination device according to the present invention irradiates light in the imaging region, and the illumination device in any one of the above-described illumination devices can change the irradiation region in the imaging region. Features.

  The imaging system according to the present invention includes an illumination device that can change an irradiation area of light emitted from a light source, and an imaging device that changes an imaging range within a predetermined imaging area. According to the imaging illumination device described above, the irradiation area in the imaging area can be changed.

  According to the illumination device of the present invention, by moving the optical element relative to the light source along the virtual vertical plane with respect to the light irradiation direction from the light source, the light irradiated from the light source is incident on the incident surface of the optical element. It is possible to change the incident position, adjust the irradiation angle of the irradiation light from the light source, and partially expand or reduce the irradiation region.

  For example, by using a light focusing means having a positive refractive power as an optical element, the irradiation angle of the irradiation light from the light source can be changed by changing the position where the irradiation light from the light source enters the incident surface of the light focusing means. Is partially enlarged, and the irradiation area can be partially expanded. Then, by using a light diffusing means having a negative refractive power as an optical element, the position at which the light emitted from the light source is incident on the incident surface of the light diffusing means is changed, thereby irradiating the irradiation light from the light source. Is partially reduced, and the irradiation area can be partially reduced.

  As described above, according to the present invention, the irradiation area is partially expanded or adjusted by arbitrarily adjusting the irradiation angle of the irradiation light from the light source with a simple configuration in which the optical element is moved relatively to the light source. Since it can be reduced, the illumination area can be changed without changing the installation angle of the illumination device itself. For this reason, when the illumination device of the present invention is used as an illumination device for imaging, for example, the installation angle of the illumination device itself is present even when the object to be irradiated is located at a position shifted from the optical axis. Without changing, the optical element can be moved relative to the light source to partially expand the irradiation region in the direction in which the object is irradiated. In addition to this, when there is an object to be irradiated at a position shifted from the optical axis and within the current irradiation area, the irradiation area on the side opposite to the direction in which the object to be irradiated exists is partially The amount of light irradiated to the irradiation target can be increased. As a result, it is possible to efficiently irradiate the irradiated object with irradiation light having sufficient brightness that enables photographing. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

It is a schematic sectional drawing of the illuminating device as 1st Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 1 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 2nd Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 2 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 3rd Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 5 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 4th Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 7 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 5th Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 9 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 6th Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 11 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 7th Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 13 from the state of FIG. It is a schematic sectional drawing of the illuminating device as 8th Embodiment to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illuminating device of FIG. 15 from the state of FIG. It is a schematic sectional drawing of the illumination system to which this invention is applied. It is a figure which shows the light irradiation area | region of the state which moved the illumination system of FIG. 17 from the state of FIG. 1 is a schematic configuration diagram of an imaging system to which the present invention is applied.

  Hereinafter, preferred embodiments of an illumination device, an illumination system, and an imaging illumination device according to the present invention will be described with reference to the drawings. First, an embodiment of a lighting device will be described.

1. Illumination Device An illumination device to which the present invention is applied will be described below with reference to the drawings, taking each of the illumination devices of the first to eighth embodiments as an example.

(1) 1st Embodiment First, the illuminating device 1 as an example of the illuminating device of this invention is demonstrated with reference to the schematic sectional drawing of the illuminating device 1 of FIG. The illumination device 1 according to the first embodiment is configured to change the irradiation angle of the irradiation light from the light source 2 by the optical lens 3 as an optical element arranged along the virtual vertical plane T with respect to the light irradiation direction Y from the light source 2. The irradiation area can be changed by adjustment. FIG. 1 shows a state in which light is emitted from the light source 2 as viewed from the side of the light source 2. In FIG. 1, the direction in which light is emitted from the light source 2 is indicated by a white arrow Y, and the direction from the light source 2 arranged on the left side in the drawing toward the right side in the drawing is the light irradiation direction Y. It is said. A plane perpendicular to the light irradiation direction Y is shown as a virtual vertical plane T.

  In the illuminating device 1, the optical lens 3 as an optical element is constituted by a light diffusing unit having a negative refractive power, and the optical lens 3 is relative to the light source 2 along the vertical plane T. And a moving device 4 that adjusts the position where the irradiation light from the light source 2 is incident on the incident surface of the optical lens 3. That is, in the illuminating device 1 according to the present invention, the light emitted from the light source 2 is moved relative to the light source 2 along the vertical plane T with respect to the light irradiation direction Y from the light source 2. Is made incident at different positions on the incident surface of the optical lens 3 to adjust the irradiation angle of the irradiation light from the light source 2 so that the irradiation region can be partially expanded. Hereinafter, each component of the illuminating device 1 of FIG. 1 is demonstrated.

(1-1) Light Source The light source 2 is not particularly limited as long as it can be used as the light source 2 of the lighting device 1. In addition to a light emitting element such as a light emitting diode or an organic EL element, an incandescent bulb or a halogen bulb is used. Further, it can be configured using a conventionally known light source such as a fluorescent lamp. These may be point light sources or surface light sources. Further, both the point light source and the surface light source can be configured using a plurality of light emitting elements and the like. These can select an appropriate light source as appropriate according to the application of the lighting device 1.

(1-2) Optical lens (optical element)
The optical lens 3 can be configured using any optical lens having refractive power such as a plastic lens and a glass lens. Here, the refractive power is a value equal to the reciprocal of the focal length of the lens, and indicates a positive value for a convex lens and a negative value for a concave lens. The optical lens 3 used in the illumination device 1 as the first embodiment is constituted by a concave lens as light diffusing means having negative refractive power.

  What is necessary is just to set the refractive power of the concave lens as a light-diffusion means according to the irradiation range (illumination angle) requested | required of the said illuminating device 1. FIG. For this reason, at least one of the entrance surface and the exit surface of the optical lens 3 configured by the light diffusing means may have a concave curved shape and have a predetermined refractive power. FIG. 1 shows a case where the exit surface of the optical lens 3 of the illumination device 1 has a curved shape that is recessed with a predetermined curvature.

  Further, the focal length of the optical lens 3 of the illumination device 1 of FIG. 1 can be appropriately selected according to the irradiation range required for the illumination device 1, but this optical lens 3 is It is preferable that the light beam emitted from the light source 2 is formed in such a size that it can enter only a part of the optical lens 3 instead of the entire area. As a result, it is possible to irradiate light from a part of the exit surface of the optical lens 3 by allowing the light emitted from the light source 2 to enter only a part of the area of the optical lens 3 and not to diffuse. Because it becomes.

  In the first embodiment, the optical lens 3 having negative refractive power is employed as the optical element. However, the illumination device in the present invention is not limited to this, and light having negative refractive power. As long as the diffusing means is provided in the same virtual plane T perpendicular to the light irradiation direction Y from the light source 2, an appropriate optical element can be appropriately employed.

(1-3) Moving device (moving means)
In the illuminating device 1 of FIG. 1, the moving device 4 as the moving means is optically maintained while maintaining the distance between the light source 2 and the optical lens 3 along the plane T perpendicular to the light irradiation direction Y of the light source 2. By moving the lens 3, the position where the irradiation light from the light source 2 enters the incident surface of the optical lens 3 is changed. The moving device 4 is connected to a control unit 6 such as a microcomputer. Based on a control signal from the control unit 6, the moving device 4 continuously determines the position where the irradiation light from the light source 2 enters the incident surface of the optical lens 3. Change it. The moving device 4 is not limited to a device that is controlled to move based on a control signal from the control unit 6, and may be a device that manually moves the optical lens 3.

  The moving device 4 moves the optical lens 3 relative to the light source 2 along the vertical plane T to change the position where the light irradiated from the light source 2 enters the incident surface of the optical lens 3. As long as it is possible, there is no particular limitation. For example, the position where the light emitted from the light source 2 enters the incident surface of the optical lens 3 may be changed by moving the light source 2 along a virtual plane on which the light source 2 is provided.

(1-4) Control unit (control means)
The control unit 6 is configured by a general-purpose microcomputer or the like, and input means for selecting an irradiation range of light emitted from the lighting device 1 is connected to the input side, and as described above, the output side The moving device 4 is connected. The controller 6 controls the moving device 4 based on an input signal from an input unit that adjusts the irradiation angle of the irradiation light from the illumination device 1 to adjust the irradiation region.

(1-5) Operation of Lighting Device Next, the operation of the lighting device 1 of FIG. 1 described above will be described with reference to FIG. FIG. 2 shows a state in which the optical lens 3 is moved from the state of the illumination device 1 of FIG. 1 upward (in the direction of the solid line arrow) in the figure. Based on the control signal from the control unit 6, the moving device 4 moves the optical lens 3 along the vertical plane T with respect to the direction of light irradiation from the light source 2, so that the irradiation light from the light source 2 is incident on the optical lens 3. Change the incident position. Thereby, the position where the irradiation light from the light source 2 is incident on the incident surface of the optical lens 3 is changed, and the position where the light is emitted from the emission surface is changed. In the illumination device of FIG. 1, the optical lens 3 has a negative refractive power, and the exit surface of the optical lens 3 has a curved shape with a predetermined curvature. For this reason, when the irradiation light from the light source 2 is incident on the substantially central position of the optical lens 3, the diffused light is irradiated in the same direction as the light irradiation direction Y from the light source 2, and is emitted from the emission surface. As the position of the emitted light approaches the edge of the optical lens 3, the refraction angle of the light incident on the edge of the optical lens 3 increases, and the light located on the edge side partially diffuses greatly. As a result, the irradiation angle of the portion increases.

  Therefore, when the irradiation range of the light irradiated from the illuminating device 1 is partially expanded, the optical lens 3 is relative to the light source 2 so as to face the direction opposite to the direction in which the expansion of the irradiation range is desired. Move to. Thereby, the irradiation area on the opposite side to the direction in which the optical lens 3 is moved relative to the light source 2 can be partially enlarged. Thus, even when the object to be irradiated is located at a position shifted from the light irradiation direction of the light source 2, the optical lens 3 is moved relative to the light source 2 so that the object to be irradiated can be efficiently Can be irradiated with light. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(2) 2nd Embodiment Next, the illuminating device 10 to which this invention as 2nd Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 10 of FIG. The illuminating device 10 shown in FIG. 3 has the same basic configuration as the illuminating device 1 shown in FIG. 1 described above, but has a different refractive power of the optical lens 3. Below, the structure of the optical lens 13 different from the illuminating device 1 shown in FIG. 1 is mainly demonstrated about the illuminating device 10 shown in FIG.

  In the illuminating device 10 as the second embodiment to which the present invention is applied, the optical lens 3 as an optical element is constituted by a light focusing means having a positive refractive power, and the optical lens 3 is optically related to the light source 2. A moving device 4 is provided that adjusts the position at which the irradiation light from the light source 2 enters the incident surface of the optical lens 13 by relatively moving the lens 13 along the virtual vertical plane T. That is, in the illumination device 1 according to the present invention, the light emitted from the light source 2 is moved relative to the light source 2 along the vertical plane T with respect to the light irradiation direction Y from the light source 2. Are made incident at different positions on the incident surface of the optical lens 13 to adjust the irradiation angle of the irradiation light from the light source 2 so that the irradiation region can be partially reduced.

  The optical lens 13 used in the illuminating device 10 as the second embodiment is configured by a convex lens as light focusing means having positive refractive power. What is necessary is just to set the refractive power of the convex lens as a light focusing means according to the irradiation range (illumination angle) requested | required of the said illuminating device 10. FIG. Therefore, it is good also as a structure which has predetermined refractive power by making at least one into the convex curved shape among the entrance plane or exit surface of the optical lens 13 comprised by a light condensing means. FIG. 3 shows a case where the exit surface of the optical lens 13 of the illumination device 10 has a curved shape swelled with a predetermined curvature.

  Further, the focal length of the optical lens 13 of the illumination device 10 in FIG. 3 can be appropriately selected according to the irradiation range required for the illumination device 10, but the optical lens 13 is It is preferable that the light beam emitted from the light source 2 is formed in such a size that it can enter only a part of the optical lens 13 instead of the entire area. As a result, it is possible to make the light emitted from the light source 2 enter only a partial area, not the entire area of the optical lens 13, converge, and irradiate the light from a part of the exit surface of the optical lens 13. Because it becomes.

  In the second embodiment, the optical lens 13 having a positive refractive power is employed as the optical element. However, the illumination device in the present invention is not limited to this, and light having a positive refractive power is used. As long as the focusing means is provided in the same virtual plane T perpendicular to the light irradiation direction Y from the light source 2, an appropriate optical element can be appropriately employed.

  Next, the operation of the illumination device 10 of FIG. 3 described above will be described with reference to FIG. FIG. 4 shows a state in which the optical lens 13 is moved upward from the state of the illumination device 10 of FIG. 3 (in the direction of the solid line arrow). Based on the control signal from the control unit 6, the moving device 4 moves the optical lens 13 along the virtual vertical plane T with respect to the light irradiation direction from the light source 2, so that the irradiation light from the light source 2 enters the optical lens 13. Change the position of incidence on the surface. Thereby, the position where the irradiation light from the light source 2 is incident on the incident surface of the optical lens 13 is changed, and the position where the light is emitted from the emission surface is changed. In the illumination device 10 of FIG. 3, the optical lens 13 has a positive refractive power, and the emission surface of the optical lens 13 has a curved shape protruding with a predetermined curvature. For this reason, when the irradiation light from the light source 2 is incident on the substantially central position of the optical lens 13, the condensed light is irradiated in the same direction as the light irradiation direction Y from the light source 2, and the emission surface The closer the position of the light emitted from the optical lens 13 is to the edge of the optical lens 13, the larger the refraction angle of the light incident on the edge of the optical lens 13, and the light located on the edge is partially focused. Thus, the irradiation angle of the part is narrowed.

  Therefore, when the irradiation range of the light irradiated from the illumination device 10 is partially reduced, the optical lens 13 is relative to the light source 2 so as to face the direction opposite to the direction in which the reduction of the irradiation range is desired. Move to. Thereby, the illumination area on the opposite side to the direction in which the optical lens 13 is moved relative to the light source 2 can be partially reduced to perform illumination with a part missing. As a result, even when there is an object to be irradiated at a position deviated from the light irradiation direction of the light source 2, the optical lens 13 is moved relative to the light source 2, so that the object is irradiated like a spotlight. It becomes possible to efficiently irradiate the irradiation object with light. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(3) 3rd Embodiment Next, the illuminating device 20 to which this invention as 3rd Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 20 of FIG. The illuminating device 20 shown in FIG. 5 has the same basic configuration as the illuminating device 1 shown in FIG. 1 described above, but is different in the configuration of the optical element (optical glass 3). Below, the structure of the optical element 23 different from the illuminating device 1 shown in FIG. 1 is mainly demonstrated about the illuminating device 20 shown in FIG.

  In the illuminating device 20 according to the third embodiment to which the present invention is applied, the optical element 23 is the first optical refracting means arranged along the virtual vertical plane T with respect to the light irradiation direction Y from the light source 2. A second light refracting means is disposed on the light exit side of the lens 24 and the first optical lens 24, has a refractive index comparable to that of the first optical lens 24, and has an exit surface 25B having a predetermined curved shape. And the light exit surface 24B of the first optical lens 24 and the light entrance surface 25A of the second optical lens 25 have a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2. Light that is emitted from the exit surface 25B of the second optical lens 25 by moving the second optical lens 25 parallel to the exit surface 24B of the first optical lens 24 with respect to the first optical lens 24. Adjust the emission position of It is characterized in that it comprises a mobile device 26 that. That is, in the illuminating device 20 according to the present invention, the second optical lens 25 is moved in parallel with the light exit surface 24B of the first optical lens 24 with respect to the light source 2, thereby allowing the light emitted from the light source 2 to be second. By adjusting the emission position of the light emitted from the emission surface 25B of the optical lens 25, the irradiation angle of the irradiation light from the light source 2 can be adjusted to partially expand the irradiation region.

  The optical element 23 used in the illuminating device 20 as the third embodiment includes a first optical lens 24 arranged along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and the first optical lens 24. And a second optical lens 25 disposed on the light emitting side. The first optical lens 24 and the second optical lens 25 are optical elements having a similar refractive index, and both have a shape in which the incident surface and the output surface are not parallel. In the illuminating device 20 of FIG. 5, the first optical lens 24 and the second optical lens 25 are constituted by concave lenses as light diffusing means having negative refractive power.

  As shown in FIG. 5, in the first optical lens 24, the incident surface 24 </ b> A is formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and the emission surface 24 </ b> B is light from the light source 2. It is formed by an inclined surface that forms a predetermined angle with the vertical surface T with respect to the irradiation direction Y. The second optical lens 25 disposed adjacent to the light exit side of the first optical lens 24 has the first optical so that the incident surface 25A is substantially parallel to the exit surface 24B of the first optical lens 24. Similarly to the exit surface 24B of the lens 24, the lens 24 is formed by an inclined surface that forms a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2. The emission surface 25B of the second optical lens 25 is formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and has a predetermined curved shape, in this case, the second optical lens 25 is negative. Therefore, the emission surface 25B is configured to have a predetermined refractive power as a concave curved shape.

  The entrance surface 25A of the second optical lens 25 and the exit surface 24B of the first optical lens 24 may be disposed in contact with each other, or may be spaced apart at a predetermined interval. However, in the case of being spaced apart, it is preferable that the incident surface 25A of the second optical lens 25 and the emission surface 24B of the first optical lens 24 are disposed substantially in parallel.

  In addition, the focal length of the optical element 23 of the illumination device 20 in FIG. 5 can be appropriately selected according to the irradiation range required for the illumination device 20, but the optical element 23 is configured. It is preferable that at least the second optical lens 25 is formed in such a size that the light beam emitted from the light source 2 can enter only a part of the optical lens 25 instead of the entire area. As a result, the light emitted from the light source 2 is incident not only on the entire area of the second optical lens 25 but only on a partial area of the second optical lens 25 that moves parallel to the first optical lens 24 to diffuse. This is because light can be irradiated from a part of the emission surface 25B of the second optical lens 25.

  The moving device 26 as the moving means used in the illumination device 20 as the third embodiment is a distance between the first optical lens 24 and the second optical lens 25 with respect to the emission surface 24B of the first optical lens 24. The second optical lens 25 is moved in parallel while maintaining the above, so that the irradiation light from the light source 2 enters the second optical lens 25 via the first optical lens 24 and the second optical lens 25 The position of the light emitted from the emission surface is changed. In the present invention, if the exit surface 24B of the first optical lens 24 and the entrance surface 25A of the second optical lens 25 can be moved in parallel, the exit surface 24B of the first optical lens 24 and the second The distance (interval) between the two optical lenses 25 and the incident surface 25A may be adjustable. In this way, the moving device 26 is connected to the control unit 6 such as a microcomputer, and based on the control signal from the control unit 6, the irradiation light from the light source 2 is converted into the second optical lens of the optical element 23. The position which radiates | emits from 25 output surfaces is changed continuously. The moving device 26 is not limited to a device that is controlled to move based on a control signal from the control unit 6 as in the case of the moving device 4 described above, and is a device that manually moves the second optical lens 25. It may be.

  Next, the operation of the illumination device 20 of FIG. 5 described above will be described with reference to FIG. 6 shows a state in which the second optical lens 25 is moved in the upward direction (in the direction of the solid arrow) in the drawing from the state of the illumination device 20 in FIG. 5 on the left side, and on the right side in FIG. The state which moved the 2nd optical lens 25 to the downward direction (solid line arrow direction) in the figure from the state of the illuminating device 20 is shown. Based on the control signal from the control unit 6, the moving device 26 moves the second optical lens 25 in parallel with the emission surface 24 </ b> B of the first optical lens 24, so that the light source 2 irradiates the first optical lens 24. The position of the light incident on the second optical lens 25 via the light and exiting from the exit surface 25B of the second optical lens 25 is changed.

  In the illumination device 20 of FIG. 5, the first and second optical lenses 24 and 25 have the same negative refractive power, and the emission surface 25B of the second optical lens 25 is curved with a predetermined curvature. Presents. For this reason, when the light irradiated from the light source 2 is incident on substantially the center position of the first optical lens 24 and the second optical lens 25, the light is diffused in the same direction as the light irradiation direction Y from the light source 2. Light is irradiated. Then, the second optical lens 25 moves parallel to the emission surface of the first optical lens 24, and the position of the light incident on the incident surface 25 </ b> A of the second optical lens 25 is the edge of the second optical lens 25. The closer to the part, the larger the refraction angle of the light incident on the edge side of the second optical lens 25, the light located on the edge side is partially diffused, and the irradiation angle of the part is growing.

  Therefore, when the irradiation range of the light irradiated from the illuminating device 20 is partially expanded, the second optical lens 25 is directed to the opposite side to the direction in which the expansion of the irradiation range is desired. Move against. Thereby, the irradiation area on the opposite side to the direction in which the second optical lens 25 is moved relative to the first optical lens 24 can be partially enlarged.

  In the left diagram of FIG. 6, since the second optical lens 25 is moved in the upward direction in the drawing, the light emitted from the first optical lens 24 is incident on the lower portion of the second optical lens 25 and is incident on the center of the lens. Without substantially changing the refraction angle of the light flux, the lower light flux near the edge emits light that is greatly refracted and extended obliquely downward. In this case, it is possible to illuminate the irradiation region in which only the lower part is partially enlarged.

  In the right diagram of FIG. 6, since the second optical lens 25 is moved downward in the figure, the light emitted from the first optical lens 24 is incident on the upper portion of the second optical lens 25, Without substantially changing the refraction angle of the light beam from the center of the lens, the upper light beam close to the edge emits light that is greatly refracted and expanded in an obliquely upward direction. In this case, it is possible to illuminate the irradiation region in which only the upper part is partially enlarged.

  As described above, the illumination device 20 as the third embodiment replaces the second optical lens 25 with the first optical lens 24 even when the object to be irradiated is located at a position shifted from the light irradiation direction of the light source 2. It is possible to efficiently irradiate the irradiated object with light. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(4) 4th Embodiment Next, the illuminating device 30 to which this invention as 4th Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 30 of FIG. The illumination device 30 shown in FIG. 7 has the same basic configuration as the illumination device 20 shown in FIG. 5 described above, but has a different optical element configuration. Below, the structure of the optical element different from the illuminating device 20 shown in FIG. 5 is mainly demonstrated about the illuminating device 30 shown in FIG.

  In the illuminating device 30 as the fourth embodiment to which the present invention is applied, the optical element 33 is the first optical refracting unit disposed along the virtual vertical plane T with respect to the light irradiation direction Y from the light source 2. The second optical as second light refracting means disposed on the light exit side of the lens 34 and the first optical lens 34, having a refractive index different from that of the first optical lens 34, and having an exit surface 35B having a predetermined curved shape. And an exit surface 34B of the first optical lens 34 and an incident surface 35A of the second optical lens 35 are inclined so as to form a predetermined angle with a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2. This is a surface that moves the second optical lens 35 parallel to the emission surface 34B of the first optical lens 34 with respect to the first optical lens 34, and is emitted from the emission surface 35B of the second optical lens 35. The exit position of It is characterized in that it comprises a mobile device 26 to be integer. That is, in the illuminating device 30 according to the present invention, the second optical lens 35 is moved in parallel to the emission surface 34B of the first optical lens 34 with respect to the light source 2, so that the light emitted from the light source 2 is second By adjusting the emission position of the light emitted from the emission surface 35B of the optical lens 35, the irradiation angle of the irradiation light from the light source 2 can be adjusted to partially expand the irradiation region.

  The optical element 33 used in the illumination device 30 as the fourth embodiment includes a first optical lens 34 arranged along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and the first optical lens 34. And a second optical lens 35 disposed on the light emitting side. The first optical lens 34 and the second optical lens 35 have different refractive indexes, and in this embodiment, the refractive index of the second optical lens 35 is larger than the refractive index of the first optical lens 34. Similarly to the optical lenses 24 and 25 of the third embodiment described above, the optical lenses 34 and 35 in the present embodiment also have shapes in which the incident surface and the exit surface are not parallel.

  In the illuminating device 30 of FIG. 7, the first optical lens 34 and the second optical lens 35 are constituted by concave lenses as light diffusing means having negative refractive power. As shown in FIG. 7, in the first optical lens 34, the incident surface 34 </ b> A is formed along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and the emission surface 34 </ b> B is light from the light source 2. It is formed by an inclined surface that forms a predetermined angle with a virtual vertical surface T with respect to the irradiation direction Y. The second optical lens 35 disposed adjacent to the light exit side of the first optical lens 34 is arranged so that the incident surface 35A is substantially parallel to the exit surface 34B of the first optical lens 34. Similarly to the light exit surface 34B of 34, it is formed by an inclined surface that forms a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2. The emission surface 35B of the second optical lens 35 is formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and has a predetermined curved shape, in this case, the second optical lens 35 is negative. Therefore, the exit surface 35B is configured to have a predetermined refractive power as a concave curved shape.

  Since the moving device 26 as the moving means used in the lighting device 30 as the fourth embodiment has the same configuration as the moving device 26 used in the lighting device 20 as the above-described third embodiment, the description will be made. Omitted.

  Next, the operation of the illumination device 30 of FIG. 7 described above will be described with reference to FIG. 8 shows a state in which the second optical lens 35 is moved in the upward direction (solid arrow direction) in the drawing from the state of the illumination device 30 in FIG. 7 on the left side, and on the right side in FIG. A state is shown in which the second optical lens 35 is moved from the state of 30 downward in the figure (in the direction of the solid line arrow). Based on the control signal from the control unit 6, the moving device 26 moves the second optical lens 35 in parallel to the emission surface 34 </ b> B of the first optical lens 34, so that the light source 2 irradiates the first optical lens 34. The position of light entering the second optical lens 35 via the light and exiting from the exit surface of the second optical lens 35 is changed.

  In the illumination device 30 of FIG. 7, the second optical lens 33 has a refractive power greater than that of the first optical lens 34, and the emission surface 35 </ b> B of the second optical lens 35 has a curved shape with a predetermined curvature. ing. For this reason, when the irradiation light from the light source 2 is incident on substantially the center position of the first optical lens 34 and the second optical lens 35, the light is diffused in the same direction as the light irradiation direction Y from the light source 2. Light is irradiated. At this time, in the illumination device 30 of FIG. 7, the second optical lens 33 has a refractive index larger than that of the first optical lens 34, and the emission surface 35B of the second optical lens 33 has a concave curved shape. Compared with the illuminating device 20 of FIG. 5 in which the first and second optical lenses 24 and 25 have the same refractive power, the light is refracted in a direction in which the light is more diffused and is emitted by the emission surface 35B of the second optical lens 35. Since it can be emitted, the irradiation range is wide.

  Then, the second optical lens 35 moves parallel to the emission surface of the first optical lens 34, and the position of the light incident on the incident surface 35 </ b> A of the second optical lens 35 is the edge of the second optical lens 35. The closer to the portion, the larger the refraction angle of the light incident on the edge side of the second optical lens 35, the light located on the edge side is partially diffused, and the irradiation angle of the portion becomes larger. growing.

  Therefore, when the irradiation range of the light irradiated from the illuminating device 30 is partially expanded, the second optical lens 35 is directed to the side opposite to the direction in which the expansion of the irradiation range is desired. Move against. Thereby, the irradiation area on the opposite side to the direction in which the second optical lens 35 is moved with respect to the first optical lens 34 can be partially enlarged.

  Also in this case, in the illumination device 30 of FIG. 7, the second optical lens 35 has a refractive index larger than that of the first optical lens 34, and the emission surface 35B of the second optical lens 35 has a concave curved shape. The direction in which the light incident on the edge side of the second optical lens 35 is more diffused than the illumination device 20 of FIG. 5 in which the first and second optical lenses 24 and 25 have the same refractive power. Since the light can be refracted and emitted from the emission surface 35B of the second optical lens 35, the irradiation range partially expanded is widened.

  In the left diagram of FIG. 8, since the second optical lens 35 is moved upward in the drawing, the light emitted from the first optical lens 34 is below the second optical lens 35 than in the left diagram of FIG. The incident light is more largely biased, and the expanded light is emitted by the lower light beam near the edge being largely refracted obliquely downward without substantially changing the refraction angle of the light beam from the center of the lens. In this case, it is possible to illuminate the irradiation region in which only the lower part is partially enlarged.

  In the right diagram of FIG. 8, since the second optical lens 35 is moved downward in the figure, the light emitted from the first optical lens 34 is incident on the upper portion of the second optical lens 35, Without substantially changing the refraction angle of the light beam from the center of the lens, the upper light beam close to the edge emits light that is greatly refracted and expanded in an obliquely upward direction. In this case, it is possible to illuminate the irradiation region in which only the upper part is partially enlarged.

  As described above, the illumination device 30 according to the fourth embodiment replaces the second optical lens 35 with the first optical lens even when the object to be irradiated is located at a position greatly deviated from the light irradiation direction of the light source 2. By moving with respect to 34, it becomes possible to irradiate light efficiently to the irradiated object. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(5) 5th Embodiment Next, the illuminating device 40 to which this invention as 5th Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 40 of FIG. The illumination device 40 shown in FIG. 9 has the same basic configuration as the illumination device 30 shown in FIG. 7 described above, but the first and second optical lenses 34 and 35 constituting the optical element 33 have a refractive index. The relationship is different. Below, the structure of the optical element different from the illuminating device 30 shown in FIG. 7 is mainly demonstrated about the illuminating device 40 shown in FIG.

  In the illumination device 40 as the fifth embodiment to which the present invention is applied, the optical element 43 includes the first optical lens 44 arranged along the virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and the first The second optical lens 45 is disposed on the light exit side of the optical lens 44, and the refractive index of the first optical lens 44 is larger than the refractive index of the second optical lens 45. In the illumination device 40 of FIG. 9, the first optical lens 44 and the second optical lens 45 are constituted by concave lenses as light diffusing means having negative refractive power.

  As shown in FIG. 9, the first optical lens 44 has an incident surface 44 </ b> A formed along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and an exit surface 44 </ b> B having light from the light source 2. It is formed by an inclined surface that forms a predetermined angle with a virtual vertical surface T with respect to the irradiation direction Y. The second optical lens 45 disposed adjacent to the light emitting side of the first optical lens 44 has the first optical lens so that the incident surface 45A is substantially parallel to the emitting surface 44B of the first optical lens 44. Similarly to the exit surface 44B of the lens 44, it is formed by an inclined surface that forms a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2. The emission surface 45B of the second optical lens 45 is formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and has a predetermined curved shape, in this case, the second optical lens 45 is negative. Therefore, the emission surface 45B is configured to have a predetermined refractive power as a concave curved shape.

  Next, the operation of the illumination device 40 of FIG. 9 described above will be described with reference to FIG. The figure shows a state in which the second optical lens 45 is moved from the state of the illumination device 40 in FIG. 9 to the left side in the upward direction (solid arrow direction) in the drawing, and the illumination device 40 in FIG. 9 on the right side. From this state, the second optical lens 45 is moved downward in the figure (in the direction of the solid arrow). Similar to the illumination device 30 according to the fourth embodiment described above, the moving device 26 causes the second optical lens 45 to be parallel to the exit surface 44B of the first optical lens 44 based on the control signal from the control unit 6. By moving, the position of the light emitted from the light source 2 and incident on the second optical lens 45 via the first optical lens 44 and emitted from the exit surface of the second optical lens 45 is changed.

  In the illumination device 40 of FIG. 9, the first optical lens 44 has a refractive power greater than that of the second optical lens 45, and the exit surface 45B of the second optical lens 45 has a curved shape with a predetermined curvature. ing. For this reason, when the irradiation light from the light source 2 is incident on substantially the center position of the first optical lens 44 and the second optical lens 45, the light is diffused in the same direction as the light irradiation direction Y from the light source 2. Light is irradiated. At this time, in the illumination device 40 of FIG. 9, the first optical lens 44 has a higher refractive index than the second optical lens 45, and the emission surface 45B of the second optical lens 45 has a concave curved shape. Compared with the illuminating device 30 of FIG. 7 in which the second optical lens 35 has a higher refractive index than the first optical lens 34, the light is refracted in a direction in which the light is diffused in a smaller range, and is emitted by the emission surface 45 B of the second optical lens 45. Can be emitted.

  Then, the second optical lens 45 moves in parallel to the emission surface 44B of the first optical lens 44, and the position of the light incident on the incident surface 45A of the second optical lens 45 is determined by the second optical lens 45. The closer to the edge, the larger the refraction angle of the light incident on the edge side of the second optical lens 45, and the light located on the edge side partially diffuses greatly, and the irradiation angle of the part Becomes larger.

  Therefore, when partially expanding the irradiation range of the light irradiated from the illuminating device 40, the second optical lens 45 is directed to the side opposite to the direction in which the expansion of the irradiation range is desired. Move against. Thereby, the irradiation area on the opposite side to the direction in which the second optical lens 45 is moved relative to the first optical lens 44 can be partially enlarged.

  Also in this case, in the illumination device 40 of FIG. 9, the first optical lens 44 has a higher refractive index than the second optical lens 45, and the exit surface 45B of the second optical lens 45 has a concave curved shape. The second optical lens 35 diffuses the light incident on the edge side of the second optical lens 45 in a more limited range as compared with the illumination device 30 in FIG. 7 having a higher refractive index than the first optical lens 34. Since the light can be refracted in the direction and emitted from the emission surface 45B of the second optical lens 45, the irradiation range partially expanded can be limited.

  In the left diagram of FIG. 10, since the second optical lens 45 is moved upward in the drawing, the light emitted from the first optical lens 44 is below the second optical lens 45 than in the left diagram of FIG. Incidently incident in a limited range, the lower light beam near the edge refracts obliquely downward and emits expanded light without substantially changing the refraction angle of the light beam from the center of the lens. In this case, it is possible to illuminate the irradiation area in which only the lower part is partially enlarged within a limited range.

  In the right diagram of FIG. 10, since the second optical lens 45 is moved downward in the figure, the light emitted from the first optical lens 44 is incident on the upper portion of the second optical lens 45, Without substantially changing the refraction angle of the light beam from the center of the lens, the upper light beam close to the edge emits light that is greatly refracted and expanded in an obliquely upward direction. In this case, it is possible to illuminate the irradiation region in which only the upper part is partially enlarged in a limited range.

  As described above, the illumination device 40 according to the fifth embodiment replaces the second optical lens 45 with the first optical lens even when the object to be irradiated is located at a position greatly deviated from the light irradiation direction of the light source 2. By moving with respect to 44, it becomes possible to irradiate light efficiently to the irradiated object. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(6) 6th Embodiment Next, the illuminating device 50 to which this invention as 6th Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 50 of FIG. The illumination device 50 shown in FIG. 11 has the same basic configuration as the illumination device 30 shown in FIG. 7 described above, but is different in the configuration of the second optical lens constituting the optical element 33. Below, the structure of the optical element different from the illuminating device 30 shown in FIG. 7 is mainly demonstrated about the illuminating device 50 shown in FIG.

  In the illumination device 50 according to the sixth embodiment to which the present invention is applied, the optical element 53 includes a first optical lens 54 disposed along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and a first optical lens. The second optical lens 55 has a refractive index which is disposed on the light exit side of the lens 54 and has a refractive index different from that of the first optical lens 54 and whose exit surface 55B has a predetermined curved shape. The refractive index is larger than the refractive index of the first optical lens 54. That is, in the illuminating device 50 of FIG. 11, the first optical lens 54 has a negative refractive power, and the second optical lens 55 is configured by a convex lens as a light focusing means having a positive refractive power.

  As shown in FIG. 11, the first optical lens 54 has an incident surface 54 </ b> A formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and an output surface 54 </ b> B having light from the light source 2. It is formed by an inclined surface that forms a predetermined angle with a virtual vertical surface T with respect to the irradiation direction Y. The second optical lens 55 disposed adjacent to the light emission side of the first optical lens 54 has the first optical lens 55A substantially parallel to the emission surface 54B of the first optical lens 54. Similarly to the exit surface 54B of the lens 54, it is formed by an inclined surface that forms a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2. The emission surface 55B of the second optical lens 55 is formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and has a predetermined curved shape, in this case, the second optical lens 55 is a positive Therefore, the emission surface 55B is configured to have a predetermined refractive power as a convex curved shape.

  Next, the operation of the illumination device 50 of FIG. 11 described above will be described with reference to FIG. FIG. 12 shows a state in which the second optical lens 55 is moved from the state of the illuminating device 50 of FIG. 11 to the left side in the upward direction (solid arrow direction) in the drawing, and the illuminating device of FIG. A state is shown in which the second optical lens 55 is moved from the state of 50 downward in the figure (the direction of the solid arrow). Similar to the illuminating device 30 as the fourth embodiment described above, the moving device 26 causes the second optical lens 55 to be parallel to the exit surface 54B of the first optical lens 54 based on the control signal from the control unit 6. By moving, the position of the light emitted from the light source 2 and incident on the second optical lens 55 via the first optical lens 54 and emitted from the emission surface of the second optical lens 55 is changed.

  In the illumination device 50 of FIG. 11, the second optical lens 53 has a refractive power greater than that of the first optical lens 54, and the emission surface 55B of the second optical lens 55 has a curved shape with a predetermined curvature. ing. For this reason, when the irradiation light from the light source 2 is incident on substantially the center position of the first optical lens 54 and the second optical lens 55, the light is focused in the same direction as the light irradiation direction Y from the light source 2. Light is irradiated. At this time, in the illumination device 50 of FIG. 11, the second optical lens 55 has a refractive index larger than that of the first optical lens 54, and the emission surface 55B of the second optical lens 55 has a convex curved shape. Since the light can be refracted in the direction of focusing in a narrower range and emitted by the emission surface 55B of the second optical lens 55, the irradiation range is narrowed.

  Then, the second optical lens 55 moves parallel to the emission surface of the first optical lens 54, and the position of the light incident on the incident surface 55 </ b> A of the second optical lens 55 is the edge of the second optical lens 55. The closer to the part, the larger the refraction angle of the light incident on the edge side of the second optical lens 55, the light located on the edge side is partially focused, and the irradiation angle of the part is Get smaller.

  Therefore, when the irradiation range of the light irradiated from the illumination device 50 is partially reduced, the second optical lens 55 is directed to the side opposite to the direction in which the reduction of the irradiation range is desired. Move against. Thereby, the irradiation area on the opposite side to the direction in which the second optical lens 55 is moved with respect to the first optical lens 54 can be partially reduced.

  In the left diagram of FIG. 12, since the second optical lens 55 is moved in the upward direction in the drawing, the light emitted from the first optical lens 54 is incident on the lower portion of the second optical lens 55 with a large deviation. Without substantially changing the refraction angle of the light beam from the center, the lower light beam near the edge is largely refracted obliquely upward to emit converged light. In this case, it is possible to illuminate the irradiation area in which only the lower part is partially missing.

  In the right diagram of FIG. 12, since the second optical lens 55 is moved in the downward direction in the figure, the light emitted from the first optical lens 54 is incident on the upper portion of the second optical lens 55, Without substantially changing the refraction angle of the light beam from the center of the lens, the upper light beam close to the edge is largely refracted obliquely and emits converged light. In this case, it is possible to illuminate the irradiation area in which only the upper part is partially missing.

  As described above, the illumination device 50 according to the sixth embodiment replaces the second optical lens 55 with the first optical lens even when the object to be irradiated is located at a position greatly deviated from the light irradiation direction of the light source 2. It is possible to efficiently irradiate the object to be irradiated by changing the irradiation angle of the light partially by moving with respect to 54. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(7) 7th Embodiment Next, the illuminating device 80 to which this invention as 7th Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 80 of FIG. The illumination device 80 shown in FIG. 13 has the same basic configuration as the illumination device 30 shown in FIG. 7 described above, but is different in the configuration of the first optical lens that constitutes the optical element 33. Below, the structure of the optical element different from the illuminating device 30 shown in FIG. 7 is mainly demonstrated about the illuminating device 80 shown in FIG.

  In the illumination device 80 according to the seventh embodiment to which the present invention is applied, the optical element 83 includes a first optical lens 84 disposed along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and a first optical element. The second optical lens 85 is disposed on the light exit side of the lens 84 and has a refractive index different from that of the first optical lens 84. Similarly to the second optical lens 35 of the illumination device 30 of FIG. 7, the second optical lens 85 is configured by a concave lens as a light diffusing unit having a negative refractive power and a light exit surface 85B having a predetermined curved shape. . The first optical lens 84 is constituted by a concave lens as a light diffusing unit having a negative refractive power, the incident surface 84A having a predetermined curved shape. In this case, the refractive index of the second optical lens 85 is designed to be larger than the refractive index of the first optical lens 84.

  As shown in FIG. 13, in the first optical lens 84, the incident surface 84 </ b> A is formed along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and the emission surface 84 </ b> B is light from the light source 2. It is formed by an inclined surface that forms a predetermined angle with a virtual vertical surface T with respect to the irradiation direction Y. The second optical lens 85 disposed adjacent to the light emission side of the first optical lens 84 has the incident optical surface 85A substantially parallel to the emission surface 84B of the first optical lens 84. Similarly to the exit surface 84B of the lens 84, it is formed by an inclined surface that forms a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2.

  Next, the operation of the illumination device 80 of FIG. 13 described above will be described with reference to FIG. 14 shows a state in which the second optical lens 85 is moved in the upward direction (solid arrow direction) in the drawing from the state of the illumination device 80 in FIG. 13 on the left side, and the illumination device in FIG. 13 on the right side. A state in which the second optical lens 85 is moved from the state 80 to the downward direction (solid arrow direction) in the figure is shown. Similar to the illumination device 30 according to the fourth embodiment described above, the moving device 26 makes the second optical lens 85 parallel to the exit surface 84B of the first optical lens 84 based on the control signal from the control unit 6. By moving, the position of light emitted from the light source 2 and incident on the second optical lens 85 via the first optical lens 84 and emitted from the exit surface of the second optical lens 85 is changed.

  The illumination device 80 of FIG. 13 has a curved shape in which the incident surface 84A of the first optical lens 84 is recessed with a predetermined curvature. The second optical lens 85 has a refractive power greater than that of the first optical lens 84, and the emission surface 85B of the second optical lens 85 has a curved shape that is recessed with a predetermined curvature. For this reason, when the irradiation light from the light source 2 is incident on substantially the center position of the first optical lens 84 and the second optical lens 85, the incident light is first incident on the first optical lens 84 and the first optical lens 84. And is emitted from the exit surface 84B. Thereafter, the light is incident from the incident surface 85A of the second optical lens 85 in the same direction as the light irradiation direction Y from the light source 2, is diffused to a wider range by the second optical lens 85, and is emitted from the output surface 85B. Is done. At this time, in the illumination device 80 of FIG. 13, the second optical lens 85 has a higher refractive index than the first optical lens 84, and the incident surface 84 </ b> A of the first optical lens 84 and the exit surface 85 </ b> B of the second optical lens 85 are concave. Therefore, since the light can be refracted in the direction of diffusing in a wider range and emitted from the emission surface 85B of the second optical lens 85, irradiation is performed as compared with the illumination device 30 of FIG. The range becomes wider.

  Then, the second optical lens 85 moves in parallel with the emission surface 84B of the first optical lens 84, and the position of the light incident on the incident surface 85A of the second optical lens 85 is the position of the second optical lens 85. The closer to the edge, the larger the refraction angle of the light incident on the edge side of the second optical lens 85, and the light located on the edge side partially diffuses greatly, and the irradiation angle of the part Becomes larger.

  Therefore, when the irradiation range of the light irradiated from the illumination device 80 is partially expanded, the second optical lens 85 is directed to the opposite side to the direction in which the expansion of the irradiation range is desired. Move against. Thereby, the irradiation area on the opposite side to the direction in which the second optical lens 85 is moved with respect to the first optical lens 84 can be partially expanded.

  In the left diagram of FIG. 14, since the second optical lens 85 is moved upward in the figure, the light diffused and emitted from the first optical lens 84 is greatly biased to the lower portion of the second optical lens 85. The light beam near the center of the lens is not substantially changed from the case of FIG. 13, and the light beam on the lower side near the edge is largely refracted obliquely and emitted diffused light. In this case, it is possible to illuminate the irradiation area in which only the lower part is partially expanded.

  In the right diagram of FIG. 14, the second optical lens 85 is moved downward in the figure, so that the light diffused and emitted by the first optical lens 84 is biased toward the upper portion of the second optical lens 85. The incident light beam refracts the light beam near the center of the lens and does not substantially change the angle of refraction as shown in FIG. In this case, it is possible to illuminate an irradiation area in which only the upper part is partially expanded.

  As described above, the illumination device 80 according to the seventh embodiment replaces the second optical lens 85 with the first optical lens even when the object to be irradiated is located at a position greatly deviated from the light irradiation direction of the light source 2. It is possible to efficiently irradiate the irradiation target object by partially changing the light irradiation angle by moving it with respect to 84. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

(8) 8th Embodiment Next, the illuminating device 90 to which this invention as 8th Embodiment is applied is demonstrated with reference to the schematic sectional drawing of the illuminating device 90 of FIG. The illuminating device 90 shown in FIG. 15 has the same basic configuration as the illuminating device 30 shown in FIG. 7 described above, but is different in the configuration of the first optical lens constituting the optical element 33. Hereinafter, the configuration of optical elements different from the illumination device 30 illustrated in FIG. 7 will be mainly described with respect to the illumination device 90 illustrated in FIG. 15.

  In the illumination device 90 according to the eighth embodiment to which the present invention is applied, the optical element 93 includes a first optical lens 94 arranged along a virtual vertical plane T with respect to the light irradiation direction Y from the light source 2, and a first optical lens. A second optical lens 95 disposed on the light exit side of the lens 94 and having a refractive index different from that of the first optical lens 94 is provided. Similarly to the second optical lens 35 of the illumination device 30 of FIG. 7, the second optical lens 95 is configured by a concave lens as a light diffusing unit having a negative refractive power and a light exit surface 95B having a predetermined curved shape. . The first optical lens 94 is constituted by a convex lens as a light converging unit having a positive refracting power with the incident surface 94A having a predetermined curved shape.

  As shown in FIG. 15, in the first optical lens 94, the incident surface 94 </ b> A is formed along a virtual vertical surface T with respect to the light irradiation direction Y from the light source 2, and the emission surface 94 </ b> B is light from the light source 2. It is formed by an inclined surface that forms a predetermined angle with a virtual vertical surface T with respect to the irradiation direction Y. The second optical lens 95 disposed adjacent to the light emitting side of the first optical lens 94 has the first optical lens 95A so that the incident surface 95A is substantially parallel to the emitting surface 94B of the first optical lens 94. Similarly to the exit surface 94B of the lens 94, it is formed by an inclined surface that forms a predetermined angle with the virtual vertical surface T with respect to the light irradiation direction Y from the light source 2.

  Next, the operation of the illumination device 90 of FIG. 15 described above will be described with reference to FIG. FIG. 16 shows a state in which the second optical lens 95 is moved in the upward direction (solid arrow direction) in the figure from the state of the illumination device 90 in FIG. 15 on the left side, and the illumination device in FIG. A state is shown in which the second optical lens 95 is moved from the state 90 in the downward direction (in the direction of the solid line arrow) in the figure. Similar to the illumination device 30 as the fourth embodiment described above, the moving device 26 makes the second optical lens 95 parallel to the exit surface 94B of the first optical lens 94 based on the control signal from the control unit 6. By moving, the position of the light emitted from the light source 2 and incident on the second optical lens 95 via the first optical lens 94 and emitted from the emission surface of the second optical lens 95 is changed.

  The illumination device 90 of FIG. 15 has a curved shape in which the incident surface 94A of the first optical lens 94 swells with a predetermined curvature. The first optical lens 94 has a refractive power larger than that of the second optical lens 95, and the emission surface 95B of the second optical lens 95 has a curved shape that is recessed with a predetermined curvature. For this reason, when the irradiation light from the light source 2 is incident on substantially the center position of the first optical lens 94 and the second optical lens 95, first, the light enters the first optical lens 94 and the first optical lens 94. And is emitted from the exit surface 94B. Thereafter, the light is incident from the incident surface 95A of the second optical lens 95 in the same direction as the light irradiation direction Y from the light source 2, is diffused to a wider range by the second optical lens 95, and is emitted from the output surface 95B. Is done. At this time, in the illumination device 90 of FIG. 15, the first optical lens 94 has a refractive index larger than that of the second optical lens 95, the incident surface 84A of the first optical lens 94 has a convex curved shape, and the second optical lens Since the exit surface 95B of the lens 95 has a concave curved shape, the light can be once refracted in the direction of condensing and emitted by the exit surface 95B of the second optical lens 95.

  Then, the second optical lens 95 moves in parallel to the exit surface 94B of the first optical lens 94, and the position of the light incident on the entrance surface 95A of the second optical lens 95 is the position of the second optical lens 95. The closer to the edge, the larger the refraction angle of the light incident on the edge side of the second optical lens 95, and the light located on the edge side partially diffuses greatly, and the irradiation angle of the part Becomes larger.

  Therefore, when the irradiation range of the light irradiated from the illumination device 90 is partially expanded, the second optical lens 95 is directed to the side opposite to the direction in which the expansion of the irradiation range is desired. Move against. Thereby, the irradiation area on the opposite side to the direction in which the second optical lens 95 is moved with respect to the first optical lens 94 can be partially expanded.

  In the left diagram of FIG. 16, since the second optical lens 95 is moved upward in the figure, the light once converged and emitted from the first optical lens 94 is largely biased to the lower portion of the second optical lens 95. The incident light beam emits light diffused by the lower light beam near the edge being largely refracted obliquely downward without substantially changing the refraction angle of the light beam near the center of the lens as in FIG. In this case, it is possible to illuminate the irradiation area in which only the lower part is partially expanded.

  In the right diagram of FIG. 16, the second optical lens 95 is moved in the downward direction in the figure, so that the light diffused and emitted from the first optical lens 94 is biased to the upper part of the second optical lens 95. The incident light and the refraction angle of the light beam near the center of the lens are not substantially changed from those in the case of FIG. In this case, it is possible to illuminate an irradiation area in which only the upper part is partially expanded.

  As described above, the illumination device 90 according to the eighth embodiment replaces the second optical lens 95 with the first optical lens even when the object to be irradiated is located at a position greatly deviated from the light irradiation direction of the light source 2. It is possible to efficiently irradiate the object to be irradiated by changing the irradiation angle of the light partially by moving with respect to 94. Therefore, irradiation of light to areas other than the necessary area is suppressed, and an increase in power consumption can be avoided.

  In addition, the illuminating device as each embodiment concerning this invention mentioned above changes arbitrarily about the ratio and thickness of the refractive index of the 1st and 2nd optical lens which comprise an optical element by the illumination requested | required. be able to. In addition, the first optical lens and the second optical lens can be arbitrarily combined and changed according to the required illumination condition as to whether the light diffusion means or the light focusing means is adopted.

  In addition, the inclination angle formed by the exit surface of the first optical lens constituting each lighting device described above and the surface perpendicular to the light irradiation direction from the light source can be designed so that the side that refracts light more greatly becomes smaller. preferable. That is, by designing the exit surface (inclined surface) of the first optical lens so that the inclination angle on the side that refracts light more greatly becomes smaller, the side on which light is refracted more greatly is compared to the opposite side. The cross-sectional thickness of the optical lens is reduced. Thereby, when the second optical lens is moved with respect to the first optical lens, the composition ratio of the second optical lens in the region where the light is transmitted on the side where the light is to be bent more greatly is set. The composition ratio can be made larger, and the irradiation angle of the light emitted from the emission surface of the second optical lens can be remarkably changed.

2. Illumination system Next, an illumination system 70 according to an embodiment of the present invention will be described with reference to a schematic configuration diagram of FIG. Here, the illuminating device 70 using the illuminating device 30 as 4th Embodiment mentioned above is demonstrated.

  In the illumination system 70 to which the present invention is applied, a plurality of illumination devices 30 as the fourth embodiment described above are arranged along a virtual vertical plane with respect to the direction of light irradiation from the light source 2 and two in FIG. Features.

  Moreover, the illumination system 70 to which the present invention is applied includes a mirror plane U that is parallel to the light irradiation direction Y from the light source and includes a midpoint S of a straight line connecting the centers of the light sources 2 of the respective illumination devices 30. It is preferable that the first optical lens 34 and the second optical lens 35 constituting each light source element 32 of each illumination device 30 are mirror-symmetric with respect to each other. For example, the inclination angle formed by the emission surface 34B of the first optical lens 34 constituting each illumination device 30 and the vertical surface T with respect to the light irradiation direction Y from the light source 2 is such that the illumination system 70 as a whole is arranged closer to the center. It is preferable to design so that it may become small. Thereby, the cross section thickness of the 1st optical lens 34 by the side arrange | positioned near the center as the whole illumination system 70 is arrange | positioned so that it may become thin.

  Accordingly, as shown in the left diagram of FIG. 18, the second optical lens 35 of each illumination device 30 faces away from the side where the adjacent illumination device 30 is disposed, that is, toward the outer side of the illumination system 70. Is moved in parallel to the exit surface 34A of the first optical lens 34 by the moving device 26, so that the second optical lens 35 in the region where the light from the light source 2 is transmitted is adjacent to each illumination device 30. Is larger than the composition ratio of the first optical lens 34. Thereby, the illumination range of the light emitted from each illumination device 30 can be extended toward the center of the entire illumination system 70, and the irradiation amount of the central part of the illumination range of the light emitted from the illumination system 70 can be reduced. Can be increased.

  Further, as shown in the right diagram of FIG. 18, the second optical lens 35 of each lighting device 30 is moved by the moving device 26 toward the side where the adjacent lighting device 30 is arranged, that is, toward the center of the lighting system 70. By moving the first optical lens 34 parallel to the exit surface 34A, the second optical lens 35 is directed toward the side opposite to the side where each lighting device 30 is adjacent, that is, toward the outer side of the lighting system 70. The light emitted from the emission surface 35B can be expanded. Thereby, the irradiation area of the light irradiated from the illumination system 70 can be expanded as a whole, and a wider range of illumination can be performed.

  In particular, each illumination device 30 is parallel to the light irradiation direction Y from the light source 2 and sandwiches a mirror surface S including a midpoint S of a straight line connecting the centers of the light sources 2 of each illumination device 30. The first optical lens 34 and the second optical lens 35 that constitute each light source element 32 of each lighting device 30 are mirror-symmetrical, and thus the lighting system 70 includes a plurality of lighting devices 30. However, the angle at which light is diffused or converged can be made uniform, and the illumination system 70 as a whole can be illuminated with uniform illumination light.

  Here, as the lighting system 70 of the present embodiment, the case where the two lighting devices 30 as the third embodiment described above are provided in parallel has been described in detail. However, the lighting system according to the present invention is described. However, the present invention is not limited to this, and any lighting device can be adopted as long as the lighting device to which the present invention described above is applied is used. In this case, the number of lighting devices constituting the lighting system is not limited to two, and a plurality of lighting devices constituting the lighting system may be arranged. In addition, the number of illumination devices constituting the illumination system may be any number, but the optical elements constituting each illumination device are within the same virtual plane perpendicular to the light irradiation direction Y from the light source 2. It is preferable to be provided along.

3. Imaging System Next, an imaging system 100 as an embodiment according to the present invention will be described with reference to a schematic configuration diagram of the imaging system 100 in FIG. The imaging system 100 according to the present embodiment includes an imaging illumination device 110 to which the present invention is applied and an imaging device 120, and the imaging illumination device 110 and the imaging device 120 are electrically connected. In the imaging illumination device 110, the control unit 6 controls the moving device 4 or 26 based on the information regarding the imaging range input from the imaging device 120, and the optical element is moved along the vertical plane T with respect to the light irradiation direction Y. Alternatively, the second optical lens is moved in parallel with the emission surface of the first optical lens, and thereby, a desired range is illuminated by the imaging illumination device 110 according to the imaging range of the imaging device 120. Hereinafter, the imaging illumination device 110 and the imaging device 120 will be described.

(1) Imaging illumination device The imaging illumination device to which the present invention is applied is imaged by the illumination devices 1, 10, 20, 30, 40, 50, 80, or 90 of the embodiments to which the present invention is applied. An imaging illumination device 110 that projects light in an area, wherein the illumination range can be partially expanded or reduced by adjusting an illumination angle in the imaging area.

  As the configuration of the imaging illumination device 110, the same configuration as that of the illumination device 1, 10, 20, 30, 40, 50, 80, or 90 described above can be employed. Therefore, by using the above-described illumination device as the imaging illumination device 110, the illumination angle of the irradiation light is adjusted while the imaging illumination device is fixed at a predetermined angle, and the irradiation area is partially expanded or reduced. Can be done. Therefore, even when the angle of view of the imaging device 120 such as a wide-angle system or a telephoto system is different, it is possible to irradiate light in an illumination range corresponding to each imaging field angle.

(2) Imaging Device The imaging device 120 includes an imaging lens unit 121, a lens driving mechanism 122, an input unit 123, a connection unit, and the like, and a control unit 125 that controls the operation of the imaging device 120 including these. The imaging lens unit 121 includes a zoom lens, a focus lens, and the like. The lens driving mechanism 122 moves the zoom lens, the focus lens, and the like to predetermined positions under the control of the control unit 125, and causes the imaging lens unit 121 to perform a zoom operation, a focus operation, and the like. For example, the input unit 123 is electrically connected to an operation unit that can be operated by a user or a personal computer (PC) at a remote location by wire or wirelessly, and a control signal is transmitted to the imaging illumination device 110. Etc. Specifically, information on the imaging range of the imaging lens unit 121 is output to the imaging illumination device 110 side under the control of the control unit 125. In the imaging system 100, the imaging illumination device 110 changes the illumination range based on information regarding the imaging range input from the imaging device 120 side.

  Here, the imaging device 120 may be a monitoring imaging device installed on a ceiling surface or a wall surface. Some surveillance imaging apparatuses are configured to be able to perform a zoom operation, a focus operation, and the like by a remote operation via a PC or the like. In the present invention, the imaging illumination device 110 moves the optical element 3 and the second optical lens 25 and the like based on the information related to the imaging range of the imaging device 120 to adjust the irradiation angle of the irradiation light from the light source 2. When the irradiation region is partially expanded or contracted, and the imaging range of the imaging device 120 is changed, light is emitted to a range corresponding to the imaging range. Therefore, according to the present invention, the illumination area can be partially changed according to the imaging range of the imaging device 120 without complicating and increasing the size of the imaging illumination device 110.

  The illumination device and the imaging illumination device 110 according to each embodiment described above have been described as changing the illumination area by moving the moving device 4 mainly by electrical control. However, the illumination device and the imaging illumination according to the present invention are described. The device 110 is not limited to the lighting device of the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.

  The illumination device according to the present invention moves the optical element relative to the light source along a virtual vertical plane with respect to the direction of light irradiation from the light source, so that the light emitted from the light source enters the incident surface of the optical element. Change the position to be adjusted and adjust the irradiation angle of the irradiation light from the light source to partially expand or contract the irradiation area, for example, fixed at a predetermined irradiation angle When used as an installed illumination device for imaging, illumination according to the angle of view of a captured image such as a wide-angle system or a telephoto system can be realized, which is particularly effective. In addition to this, the present invention is also applicable to the case where the lighting device according to the present invention is adopted as a lighting device used for a projector, an image reading device, etc., or a lighting device for a vehicle, and the lighting according to each lighting requirement is realized. It is valid.

1, 10, 20, 30, 40, 50, 80, 90 Illumination device 2 Light source 3, 13, 23, 33, 43, 53, 83, 93 Optical lens (optical element)
4, 26 Moving device (moving means)
6 Control unit (control means)
24, 34, 44, 54, 84, 94 First optical lens 25, 35, 45, 55, 85, 95 Second optical lens 24A, 25A, 34A, 35A, 44A, 45A, 84A, 85A, 94A, 95A Incident Surface 24B, 25B, 34B, 35B, 44B, 45B, 84B, 85B, 94B, 95B Outgoing surface 100 Imaging system 110 Imaging illumination device 120 Imaging device

Claims (8)

An illumination device capable of changing an irradiation area by adjusting an irradiation angle of irradiation light from the light source by an optical element arranged along a virtual vertical plane with respect to a light irradiation direction from the light source,
The optical element is disposed on a light emitting side of the first light refracting means and a first light refracting means disposed along a virtual vertical plane with respect to a direction of light irradiation from the light source, and is different from the first light refracting means. A second light refracting means having a refractive index, and the exit surface of the first light refracting means and the incident surface of the second light refracting means are at a predetermined angle with a virtual vertical plane with respect to the light irradiation direction from the light source. Is an inclined surface,
With respect to the first light refracting means, the second light refracting means is moved in a direction parallel to the emission surface of the first light refracting means, and light is emitted from the emission surface of the second light refracting means. An illumination device comprising a moving means for adjusting a position. An illumination device capable of changing an irradiation area by adjusting an irradiation angle of irradiation light from the light source by an optical element arranged along a virtual vertical plane with respect to a light irradiation direction from the light source,
The optical element is disposed along a virtual vertical plane with respect to the direction of light irradiation from the light source, and disposed on the light emitting side of the first light refracting means, and is the same as the first light refracting means. A second light refracting means having a refractive index of a certain degree and an exit surface having a predetermined curved shape, and the exit surface of the first light refracting means and the incident surface of the second light refracting means are An inclined surface that forms a predetermined angle with a virtual vertical plane with respect to the direction of light irradiation from the light source
With respect to the first light refracting means, the second light refracting means is moved in a direction parallel to the emission surface of the first light refracting means, and light is emitted from the emission surface of the second light refracting means. An illumination device comprising a moving means for adjusting a position.   The lighting device according to claim 1 or 2, wherein the first and second light refracting means are light focusing means having a positive refractive power or light diffusing means having a negative refractive power.   A lighting system comprising a plurality of lighting devices according to any one of claims 1 to 3 arranged along a virtual vertical plane with respect to a direction of light irradiation from a light source. Two lighting devices according to any one of claims 1 to 3 are disposed along a virtual vertical plane with respect to a direction of light irradiation from a light source,
Each lighting device is parallel to the light irradiation direction from the light source, and sandwiches a mirror plane including a midpoint of a straight line connecting the centers of the light sources of each lighting device, and the lighting device An illumination system, wherein the first light refracting means and the second light refracting means are mirror symmetrical.   An illumination system comprising a plurality of sets of illumination devices constituting the illumination system according to claim 5. An illumination device for imaging that irradiates light within an imaging region,
An illumination device for imaging, wherein the illumination region in the imaging region can be changed by the illumination device according to any one of claims 1 to 3. In an imaging system including an illumination device capable of changing an irradiation area of light emitted from a light source, and an imaging device that changes an imaging range within a predetermined imaging region,
The imaging system according to claim 7, wherein an irradiation area in the imaging area can be changed.

Images