JP2018081748A - Lighting device - Google Patents

Abstract

A lighting device is provided which is excellent in operability when operated with one hand. An illumination device (1) can change the distance between a light source and an illumination lens (3) within a predetermined range along an optical axis (L). It is possible to change the illumination range of the illumination light. The illumination device 1 has a fixed barrel 23 that holds the light source and a lens holding barrel 22 that holds the illumination lens 3 . It has a cam mechanism 31 capable of varying the distance in the direction along the optical axis L between the light source and the illumination lens 3 by rotating the lens holding barrel 22 around the optical axis L. FIG. Here, the cam mechanism 31 sets the rotation angle of the lens holding barrel 22 to 90° and the relative movement amount between the light source and the illumination lens 3 to 3 mm. This relative movement amount of 3 mm is the maximum value of the relative movement amount between the light source and the illumination lens 3 . [Selection drawing] Fig. 3

Description

  The present invention relates to a lighting device.

  For example, Patent Document 1 discloses an illuminating device that can change the spot diameter of illumination by relatively moving the light source and the lens along the optical axis and changing the distance between them.

JP-A-10-69801

  Since such an illuminating device is often used for a reading light or the like next to a bed, there are many opportunities to be operated with one hand while lying on the bed. Then, an object of this invention is to provide the illuminating device which is excellent in the operativity at the time of operating with one hand.

  In order to achieve the above object, the illumination device of the present invention can change the distance between the light source and the illumination lens within a predetermined range along the optical axis, and emits from the illumination lens by changing the distance. An illumination device capable of changing the illumination range of the illumination light to be obtained, and by rotating the lens holding cylinder around the optical axis, the fixed cylinder holding the light source, the lens holding cylinder holding the illumination lens, A cam mechanism that can vary a distance in the direction along the optical axis between the light source and the illumination lens, and the cam mechanism has a rotation angle of the lens holding cylinder in the range of 60 ° to 120 °, The amount of relative movement between the light source and the illumination lens is 2 mm or more and 4 mm or less.

  Here, the cam mechanism may be configured such that the relative movement amount between the light source and the illumination lens is 2.5 mm or more and 3.5 mm or less in a range where the rotation angle of the lens holding cylinder is 60 ° or more and 120 ° or less.

The illumination lens has an incident surface on which light emitted from the light source enters the illumination lens, and a concave shape that reflects part of the light incident on the illumination lens from the incident surface toward the illumination direction. And an exit surface that emits light incident from the entrance surface in the illumination direction, and the entrance surface is an opening formed so that light from the light source can enter on the side where the light source is disposed. And a first incident surface formed on the inner surface of the concave portion recessed in a direction opposite to the direction in which the light source is disposed, and the first incident surface is disposed on the bottom surface of the concave portion. A condensing lens surface having a convex surface on the light source side so as to collect the light from the light source, and the second incident surface is illuminated so that the light from the light source can be transmitted toward the reflecting surface An inner surface of a recess formed around the optical axis of the lens for use, and the first incident surface is a light source A shape that increases the light distribution angle of the non-reflective illumination light that is transmitted through the first incident surface and emitted from the exit surface of the main illumination light as the illumination lens moves relatively closer to the illumination lens. The reflective surface and the second incident surface are the following (1) and (2) with respect to the reflected illumination light that is the main illumination light that is transmitted through the second incident surface, reflected by the reflective surface, and emitted from the exit surface. ) The shape may satisfy the condition of (3).
(1) As the light source and the illumination lens move relatively closer to each other, the emission direction of the reflected illumination light emitted from the emission surface changes the optical axis with respect to the emission position on the emission surface of the reflected illumination light. Tilt toward the opposite side.
(2) The light distribution angle of the reflected illumination light is increased as the light source and the illumination lens move in a relatively approaching direction.
(3) Of the reflected illumination light reflected by the reflecting surface, the one having the smallest irradiation angle with respect to the optical axis of the light from the light source to the second incident surface is defined as the first reflected light, and the light source is directed to the second incident surface. The second reflected light has the largest irradiation angle with respect to the optical axis until reaching the second incident surface, and the irradiation angle with respect to the optical axis until the light reaches the second incident surface from the light source is the first reflected light and the second reflected light. When the intermediate light is the third reflected light, the first reflected light of the first to third reflected lights is in a state where the light source and the illumination lens are farthest within a predetermined range, Illuminates near the optical axis on the surface to be illuminated.

  Further, the reflecting surface and the second incident surface are not crossed after the first reflected light and the third reflected light are emitted from the emission surface in a state where the light source and the illumination lens are farthest from each other within a predetermined range. It may be a shape.

  The first incident surface has a higher image height as the exit angle increases within a range where the exit angle of the light beam passing through the first entrance surface reaches a predetermined angle. The image height may be lowered as the value of increases.

  In addition, a fly-eye lens may be disposed on the exit surface of the illumination lens.

  In the present invention, it is possible to provide an illumination device that is excellent in operability when operated with one hand.

It is the top view which looked at the illuminating device which concerns on embodiment of this invention from the output surface side. It is AA sectional drawing of FIG. It is a perspective view which shows the state which removed the exterior cylinder from the illuminating device which concerns on embodiment of this invention. It is an expanded view of the lens holding cylinder which the illuminating device which concerns on embodiment of this invention has, and is a figure which shows the whole cam groove formed in a lens holding cylinder. 1st reflected light, 2nd reflected light, and 3rd reflected light among reflected illumination light when a light source is light-emitted in the state which has arrange | positioned the lens for illumination of the illuminating device which concerns on embodiment of this invention in the front-end position It is sectional drawing of the illuminating device which shows these optical paths. It is the figure which extended and showed the optical path of the 1st reflected light, the 2nd reflected light, and the 3rd reflected light which were shown in FIG. 5 to the to-be-illuminated surface 1 meter ahead. 1st reflected light, 2nd reflected light, and 3rd reflected light among reflected illumination light when a light source is light-emitted in the state which has arrange | positioned the lens for illumination of the illuminating device which concerns on embodiment of this invention in the intermediate position It is sectional drawing of the illuminating device which shows these optical paths. It is the figure which extended and showed the optical path of the 1st reflected light, the 2nd reflected light, and the 3rd reflected light which are shown in FIG. 7 to the to-be-illuminated surface 1 meter ahead. Of the reflected illumination light when the light source emits light with the illumination lens of the illumination device according to the embodiment of the present invention arranged at the rear end position, the first reflected light, the second reflected light, and the third reflected light It is sectional drawing of the illuminating device which shows the optical path of light. It is the figure which extended and showed the optical path of 1st reflected light, 2nd reflected light, and 3rd reflected light shown in FIG. 9 to the to-be-illuminated surface 1 meter ahead from the output surface. It is a figure which shows the aspherical extension line of the reflective surface of the lens for illumination of the illuminating device which concerns on embodiment of this invention. When the light source emits light with the illumination lens of the illumination device according to the embodiment of the present invention arranged at the front end position, the light enters from the first incident surface and exits from the output surface without passing through the reflecting surface. It is sectional drawing of the illuminating device which shows the optical path of non-reflective illumination light. It is sectional drawing of the illuminating device which shows the optical path of non-reflective illumination light when a light source is light-emitted in the state which has arrange | positioned the lens for illumination of the illuminating device which concerns on embodiment of this invention in the intermediate position. It is sectional drawing of the illuminating device which shows the optical path of non-reflective illumination light when a light source is light-emitted in the state which has arrange | positioned the illumination lens of the illuminating device which concerns on embodiment of this invention in the rear-end position. It is a figure which shows in detail the optical path at the time of the non-reflective illumination light which concerns on embodiment of this invention permeate | transmits a 1st entrance plane. FIG. 3 is a diagram in which the cross-sectional view shown in FIG. 2 of the illumination lens according to the embodiment of the present invention and the cross-sectional view of the illumination lens according to the comparative example are superimposed. The optical path of 1st reflected light, 2nd reflected light, and 3rd reflected light is shown among reflected illumination light when a light source is light-emitted in the state which has arrange | positioned the illumination lens of the illuminating device which concerns on a comparative example in the front-end position. It is sectional drawing of an illuminating device. It is the figure which extended and showed the optical path of the 1st reflected light shown in FIG. 17, the 2nd reflected light, and the 3rd reflected light to the to-be-illuminated surface 1 meter ahead. The optical path of the 1st reflected light, the 2nd reflected light, and the 3rd reflected light is shown among reflected illumination light when a light source is made to emit light in the state where the illumination lens of the lighting equipment concerning a comparative example is arranged in an intermediate position. It is sectional drawing of an illuminating device. It is the figure which extended and showed the optical path of the 1st reflected light shown in FIG. 19, the 2nd reflected light, and the 3rd reflected light to the to-be-illuminated surface 1 meter ahead from the output surface. Of the reflected illumination light when the light source emits light with the illumination lens of the illumination device according to the comparative example arranged at the rear end position, the optical paths of the first reflected light, the second reflected light, and the third reflected light It is sectional drawing of the illuminating device shown. It is the figure which extended and showed the optical path of the 1st reflected light, the 2nd reflected light, and the 3rd reflected light which are shown in FIG. 21 to the to-be-illuminated surface 1 meter ahead. It is a figure which shows the illumination intensity distribution in the to-be-illuminated surface when the lens for illumination of the illuminating device which concerns on embodiment of this invention and the illuminating device which concerns on a comparative example is arrange | positioned in the front end position. It is a figure which shows the illumination intensity distribution in the to-be-illuminated surface when the lens for illumination of the illuminating device which concerns on embodiment of this invention and the illuminating device which concerns on a comparative example is arrange | positioned in the intermediate position. It is a figure which shows the illuminance distribution in a to-be-illuminated surface when the lens for illumination of the illuminating device which concerns on embodiment of this invention and the illuminating device which concerns on a comparative example is arrange | positioned in the rear end position. It is a figure which shows the relationship between the relative displacement of a light source and the lens for illumination, and the light distribution angle of an illuminating device of the illuminating device which concerns on embodiment of this invention. It is a figure which shows the relationship between the relative displacement | movement amount of a light source and the lens for illumination, and the emitted light emission efficiency of the illuminating device which concerns on embodiment of this invention. It is a figure which shows the illumination intensity distribution in the to-be-illuminated surface when the lens for illumination of the illuminating device which concerns on the modification which has arrange | positioned the fly-eye lens to the output surface of the illuminating device which concerns on embodiment of this invention is arrange | positioned in the front end position. It is a figure which shows the illumination intensity distribution in the to-be-illuminated surface when the lens for illumination of the illuminating device of the modification concerning embodiment of this invention is arrange | positioned in an intermediate position. It is a figure which shows the illumination intensity distribution in the to-be-illuminated surface when the lens for illumination of the illuminating device of the modification which concerns on embodiment of this invention is arrange | positioned in a rear-end position.

  Hereinafter, an illumination device according to an embodiment of the present invention will be described with reference to the drawings.

(Configuration of lighting apparatus according to an embodiment of the present invention)
FIG. 1 is a plan view of the illumination device 1 according to the embodiment of the present invention as seen from the exit surface side. FIG. 2 is a cross-sectional view taken along the line AA of FIG. In addition, the hatching which should be shown in FIG. 2 is abbreviate | omitted. The hatching is also omitted in the subsequent cross-sectional views. FIG. 3 is a perspective view showing a state in which the outer cylinder is removed from the lighting device 1 according to the embodiment of the present invention. FIG. 4 is a development view of the lens holding tube 22 included in the illumination device 1 according to the embodiment of the present invention, and is a view showing the entire cam groove 33 formed in the lens holding tube 22. In the following description, the illumination direction (arrow B) of the illumination device 1 may be described as the front (front side). Moreover, the direction opposite to the illumination direction B will be described as the rear (rear side).

  The illumination device 1 can change the distance between the light source 2 and the illumination lens 3 along the optical axis L within a predetermined range. And the illuminating device 1 can change the illumination range of the illumination light radiate | emitted from the lens 3 for illumination by changing the distance. The illumination device 1 includes a fixed cylinder 23 that holds the light source 2 and a lens holding cylinder 22 that holds the illumination lens 3. In addition, the illumination device 1 includes a cam mechanism 31 that can change the distance in the direction along the optical axis L between the light source 2 and the illumination lens 3 by rotating the lens holding tube 22 about the optical axis L. Have.

  The lens holding cylinder 22 is inserted into an exterior cylinder (not shown), and the outer periphery of the lens holding cylinder 22 is covered with the exterior cylinder. The outer cylinder is formed with a screw hole penetrating the outer side and the inner side of the cylinder. By screwing a screw into this screw hole, the lens holding cylinder 22 and the exterior cylinder are integrated. Therefore, when the lens holding cylinder 22 is rotated, the outer cylinder is grasped by hand.

  Here, the cam mechanism 31 sets the relative movement amount of the light source 2 and the illumination lens 3 within 3 mm within the range of 90 ° of the rotation angle of the lens holding cylinder 22. The relative movement amount 3 mm is the maximum value of the relative movement amount between the light source 2 and the illumination lens 3.

  The cam mechanism 31 includes a cam groove 33 and a cam follower 34 that engages with the cam groove 33. As shown in FIG. 4, the cam groove 33 is formed in the lens holding cylinder 22. Three cam grooves 33 are formed at equal angles around the optical axis L, and the length of the groove is set so that the maximum rotation angle of the lens holding tube 22 is 90 degrees. The cam follower 34 is provided on the fixed cylinder 23. Three cam followers 34 are provided around the optical axis L at intervals of 120 ° so as to engage with the three cam grooves 33, respectively.

  Therefore, when the lens holding cylinder 22 is rotated about the optical axis L, the lens holding cylinder 22 is moved to the optical axis L with respect to the fixed cylinder 23 according to the rotation direction by the action of the cam groove 33 and the cam follower 34. Move back and forth along. That is, when the lens holding tube 22 is rotated around the optical axis L, the illumination lens 3 moves back and forth along the optical axis L with respect to the light source 2 according to the rotation direction of the lens holding tube 22.

  As shown in FIG. 3, the lighting device 1 includes a support member 35 and a pedestal 36. The pedestal 36 is fixed to a wall, a desk or the like with screws or the like not shown. That is, the pedestal 36 is a fixed part for installing the lighting device 1 on a wall or a desk. The lighting device 1 and the support member 35 are connected by a universal joint (not shown). Therefore, the illumination device 1 connected to the support member 35 with a universal joint can change the illumination direction in a state where the illumination device 1 is installed on the wall or the desk via the pedestal 36.

  Moreover, the illuminating device 1 according to the embodiment of the present invention includes a light source 2, an illumination lens 3 on which light emitted from the light source 2 is incident, controls the light distribution of the incident light, and is emitted. And a cam mechanism 31 that moves the lens 3 along the optical axis L. The light source 2 uses LED (Light Emitting Diode) chip components. The illumination lens 3 is an integrally molded product of a transparent material (lens material) such as acrylic resin, polycarbonate resin, or glass.

  As described above, the cam mechanism 31 includes the cam groove 33 and the cam follower 34 that engages with the cam groove 33. By rotating the lens holding cylinder 22 in which the cam groove 33 is formed around the optical axis L, the lens holding cylinder 22 moves along the optical axis L by the action of the cam groove 33 and the cam follower 34 formed in the fixed cylinder 23. Move. As the lens holding cylinder 22 moves along the optical axis L, the distance (interval) between the light source 2 and the illumination lens 3 changes.

  In FIG. 5 and subsequent figures, the cam mechanism 31 is not shown for easy understanding of the drawings. The mechanism (moving mechanism) for changing the distance between the light source 2 and the illumination lens 3 along the optical axis L is not only the cam mechanism 3 described above but also the screwing of the lens holding tube 22 and the fixed tube 23. You may go. Alternatively, the light source 2 may be moved directly along the optical axis L. Moreover, it is good also as a structure which moves both the lens 3 for illumination and the light source 2. FIG.

  The illumination lens 3 has an incident surface 4 on which light emitted from the light source 2 enters the illumination lens 3 and a part of the light incident on the illumination lens 3 from the incident surface 4 in the illumination direction B. It has a reflecting surface 5 as a reflecting surface having a concave shape to reflect, and an exit surface 6 that emits light incident from the entrance surface 4 into the illumination lens 3 in the illumination direction B. The reflecting surface 5 is an aspherical concave mirror having a center of curvature on the optical axis L side. The illumination direction B is a direction from the illumination device 1 toward the illuminated surface 9 that the illumination device 1 illuminates.

  The illumination lens 3 has a recess 8 that is formed with an opening 7 at the rear end and is recessed forward. The concave portion 8 is formed so that light emitted from the light source 2 can enter the side where the light source 2 is disposed. The inner surface of the recess 8 becomes the incident surface 4. The incident surface 4 has a first incident surface 4A and a second incident surface 4B. Here, the first incident surface 4 </ b> A is a condensing lens surface that is disposed on the bottom surface of the concave portion 8 and has a convex surface on the light source 2 side (towards the rear) so as to condense light from the light source 2. The second incident surface 4B is an inner surface formed in the recess 8 around the optical axis L of the illumination lens 3 so that the light from the light source 2 can be transmitted toward the reflecting surface 5.

  The light source 2 emits light through a fluorescent resin that encloses the LED chip portion. That is, the light emission part of the light source 2 has an area. Therefore, it is difficult to design the illumination lens 3 that can obtain a desired illuminance distribution by tracking the optical path of the illumination light. Therefore, the illumination lens 3 is designed on the basis of simulation software and actual measurement results so that light emitted from the emitting portion having an area has a desired illuminance distribution on the illuminated surface 9.

  In addition, it is difficult to configure the illumination lens 3 so that all the light emitted from the emission part of the light source 2 is guided to a range (illuminated surface) to be illuminated and this illumination range has a desired illuminance distribution. . Therefore, the illumination lens 3 is designed so that the light emitted from the light source 2 has a desired illuminance distribution on the illuminated surface 9 as a whole.

  Further, it is difficult to explain the relationship between the light emitted from the entire surface of the emission part of the light source 2 and the configuration of the illumination lens 3. Therefore, here, as the light that has a large influence on the illuminance distribution in the emission part of the light source 2, the light emitted from the point light source 2A at a predetermined irradiation angle is set as the main illumination light, and the surface 9 to be illuminated of this main illumination light The configuration of the illumination lens 3 in which the illuminance distribution in FIG.

  The point light source 2A is a point on the optical axis L of the LED chip. In the lighting device 1, the point light source 2A can be incident on the incident surface 4 when the illumination lens 3 is disposed at a front end position F described later. Light is the main illumination light. In the lighting device 1, the predetermined irradiation angle of the main illumination light is set to 148 °. The predetermined irradiation angle is a fixed value that does not change even if the distance between the light source 2 and the illumination lens 3 is changed along the optical axis L. Of the main illumination light, light that is incident from the second incident surface 4B and reflected by the reflecting surface 5 and then emitted from the emitting surface 6 is referred to as “reflected illumination light”, and is incident from the first incident surface 4A and reflected by the reflecting surface 5. The light emitted from the emission surface 6 without being reflected by the light is referred to as “non-reflective illumination light”.

  The distance between the light source 2 and the exit surface 6 of the illumination lens 3 can be changed within a predetermined range along the optical axis L by the moving mechanism 21. The longer the distance between the light source 2 and the exit surface 6 is, the narrower the illumination range on the illuminated surface 9 is. Conversely, the shorter the distance between the light source 2 and the exit surface 6 is, the wider the illumination range on the illuminated surface 9 is. In addition to the distance between the light source 2 and the exit surface 6, the illumination range depends on the shape including the size of the areas of the entrance surface 4 and the exit surface 6.

  Therefore, the predetermined range of the distance between the light source 2 and the exit surface 6 is such that the illumination range on the illuminated surface 9 is a desired width according to the shape including the area of the entrance surface 4 and the exit surface 6. Is set to be When the light source 2 and the emission surface 6 are in the state where the light source 2 and the emission surface 6 are farthest from each other and the illumination range becomes the widest in the illumination range having a desired width. The distance between the light source 2 and the exit surface 6 is such that the light source 2 and the exit surface 6 are closest to each other.

  The reflection surface 5 is a total reflection surface that totally reflects a part of the main illumination light incident in the illumination lens 3 from the second incident surface 4B in the illumination direction B. In the illumination lens 3, along the optical axis L, the first incident surface 4 A is closest to the light source 2 from the front end position F where the first incident surface 4 A is farthest from the light source 2, and the light source 2 is in the recess 8. The rear end position R can be moved.

(Optical path of illumination light in the illumination device according to the embodiment of the present invention)
FIG. 5 is a cross-sectional view of the illumination device 1 for explaining the optical path of the reflected illumination light when the illumination lens 3 of the illumination device 1 is disposed at the front end position F. FIG. 5 is a diagram in which a part of the reflected illumination light is added to the cross-sectional view of the illumination device 1 shown in FIG.

  The main illumination light emitted from the illuminating device 1 is emitted by the light distribution of the rotation target around the optical axis L. For easy understanding of the drawings and explanation, the optical path of the reflected illumination light in FIGS. 5 and 6 (FIG. 6 will be described later) is shown only on one side (one side) with respect to the optical axis L, and the optical axis L with respect to the one side. The other side (the other side) is not shown. 5 and 6 exemplify three light rays of the first reflected light P1, the second reflected light P2, and the third reflected light P3. The methods shown in FIGS. 5 and 6 are the same for FIGS. 7, 8, 9, 10, 11, 17, 18, 19, 20, 21, and 22. To do.

Here, the first reflected light P1, the second reflected light P2, and the third reflected light P3 are light emitted from the light source 2 and incident on the second incident surface 4B among the reflected illumination light reflected by the reflecting surface 5. The exit angle with respect to the axis L is
(1) The smallest one is the first reflected light P1,
(2) The largest one is the second reflected light P2,
(3) An intermediate light between the first reflected light P1 and the second reflected light P2 is defined as a third reflected light P3.

  When the illumination lens 3 is disposed at the front end position F, the exit angle of the first reflected light P1 with respect to the optical axis L is about 26 °, the exit angle of the second reflected light P2 with respect to the optical axis L is about 74 °, and The outgoing angle of the third reflected light P3 with respect to the optical axis L is about 50 °.

  The angle emission angles of the first reflected light P1, the second reflected light P2, and the third reflected light P3 with respect to the optical axis L vary depending on the distance between the illumination lens 3 and the light source 2. That is, in the illumination device 1, when the illumination lens 3 is disposed at the rear end position R, the emission angle of the first reflected light P1 with respect to the optical axis L is about 38 °, and the second reflected light P2 with respect to the optical axis L. The emission angle is about 74 °, and the emission angle of the third reflected light P3 with respect to the optical axis L is about 56 °.

  When the illumination lens 3 is disposed at the intermediate position M, the emission angle of the first reflected light P1 with respect to the optical axis L is about 30 °, and the emission angle of the second reflected light P2 with respect to the optical axis L is about 74 °. The outgoing angle of the third reflected light P3 with respect to the optical axis L is about 52 °. The intermediate position M is a position between the front end position F and the rear end position R. The intermediate position M does not need to be a strictly central (middle) position between the front end position F and the rear end position R. For example, it may be about 30% of the distance between the front end position F and the rear end position R from the center position between the front end position F and the rear end position R.

  The illuminating device 1 is configured, for example, such that the surface to be illuminated is set at a position approximately 1 meter away from the exit surface 6 and a desired illuminance distribution is obtained in a desired illumination range at this position. FIG. 6 is a diagram showing the optical paths of the first reflected light P1, the second reflected light P2, and the third reflected light P3 shown in FIG. 5 extended from the exit surface 6 to the illuminated surface 9 about 1 meter away. The surface 9 to be illuminated is not limited to 1 meter and can be a desired distance, and the shape including the size of the illumination lens 3 and the shape of the light source 2 are set according to this distance. The “predetermined distance” is a distance that can be determined according to the application of the lighting device 1 or the like. For example, when the lighting device 1 is used as a bedside reading light, a predetermined distance can be set to about 1 meter, and when the lighting device 1 is used as room lighting that illuminates the floor surface from the ceiling. , About 2.5 emails can be set as a predetermined distance. Furthermore, when using the illuminating device 1 in order to illuminate the picture displayed on the wall surface from the ceiling side, about 2 meters can be set to a predetermined distance.

  FIG. 7 is a cross-sectional view of the illuminating device 1 showing an optical path of reflected illumination light when the illumination lens 3 of the illuminating device 1 is disposed at an intermediate position M that is a position between the rear end position R and the front end position F. It is. FIG. 8 is a view showing the optical paths of the first reflected light P1, the second reflected light P2, and the third reflected light P3 shown in FIG. 7 extending from the exit surface 6 to the illuminated surface 9 1 meter ahead.

  FIG. 9 is a cross-sectional view of the illumination device 1 showing the optical path of the reflected illumination light when the illumination lens 3 of the illumination device 1 is disposed at the rear end position R. FIG. 10 is a diagram showing the optical paths of the first reflected light P1, the second reflected light P2, and the third reflected light P3 shown in FIG. 9 extending from the exit surface 6 to the illuminated surface 9 1 meter ahead.

  The reflecting surface 5 and the second incident surface 4B have shapes that satisfy the following conditions (1), (2), and (3).

Condition (1)
The reflective surface 5 and the second incident surface 4B are emitted from the light source 2 as shown in FIGS. 5, 6, 7, 8, 9, and 10, and are incident surface 4, reflective surface 5, and exit surface 6. The emission direction of the reflected illumination light emitted via the light is changed according to the movement from the front end position F to the rear end position R of the illumination lens 3 (movement where the light source 2 and the illumination lens 3 relatively approach each other). The shape is inclined from one side of the axis L toward the other side.

Condition (2)
Further, as can be seen from FIGS. 6, 8 and 10, the reflecting surface 5 and the second incident surface 4B move from the front end position F to the rear end position R of the illumination lens 3 (the light source 2 and the illumination lens 3). And the light distribution angle (irradiation range) of the reflected illumination light emitted from the emission surface 6 is increased.

Condition (3)
Of the first reflected light P1, the second reflected light P2, and the third reflected light P3 reflected by the reflecting surface 5 with the illumination lens 3 disposed at the front end position F, the first reflected light P1 The illumination surface 9 is illuminated closest to the optical axis L. That is, the first reflected light P1 illuminates the vicinity of the optical axis L on the illuminated surface 9.

  In addition, the lens 3 for illumination used for the illuminating device 1 is set as the structure which satisfy | fills the following conditions. That is, as shown in FIG. 11, the light source 2 is located at the vertex 5 </ b> B on the aspherical extension line 5 </ b> A of the reflecting surface 5 arranged on the optical axis L (shown in an arc shape with a dashed line in FIG. 11). When it is arranged, the angle (emission angle) a1 of the first reflected light P1 with respect to the optical axis L is 20 ° or more and 25 ° or less, and the emission angle a2 of the second reflected light P2 with respect to the optical axis L Are set to 55 ° or more and 65 ° or less, such as the aspherical shape of the reflecting surface 5 and the angle of the second incident surface 4B with respect to the optical axis L.

  As can be seen from FIGS. 5 and 6, the reflecting surface 5 and the second incident surface 4 </ b> B provide the first reflected light P <b> 1 and the third reflected light P <b> 3 when the illumination lens 3 is disposed at the front end position F. The shape is such that it does not intersect after exiting from the exit surface 6.

  Moreover, 4 A of 1st entrance surfaces are made into the shape which enlarges the light distribution angle of non-reflective illumination light as the light source 2 and the lens 3 for illumination move to the direction which approaches relatively.

  FIG. 12 shows the non-reflective illumination light that enters from the first incident surface 4A and exits the exit surface 6 without passing through the reflective surface 5 when the illumination lens 3 of the illumination device 1 is disposed at the front end position F. It is sectional drawing of the illuminating device 1 which shows these optical paths. FIG. 12 is obtained by adding an optical path of non-reflective illumination light to the cross-sectional view of the illumination apparatus 1 shown in FIG. The method shown in FIG. 12 is the same for FIGS. 13 and 14 described later.

  FIG. 13 shows a cross section of the illuminating device 1 showing the optical path of the non-reflective illumination light when the illuminating lens 3 of the illuminating device 1 is disposed at an intermediate position M that is a position between the rear end position R and the front end position F. FIG. FIG. 14 is a cross-sectional view of the illuminating device 1 showing the optical path of the non-reflective illumination light when the illuminating lens 3 of the illuminating device 1 is disposed at the rear end position R.

  Light (non-reflective illumination light) from the light source 2 incident from the first incident surface 4A is condensed. As can be seen from FIGS. 12, 13 and 14, the illumination range of the non-reflective illumination light becomes wider as the illumination lens 3 moves from the front to the rear. The optical path P4 and the optical path P5 indicate the light rays at the peripheral edge across the optical axis L of the non-reflective illumination light.

  The shape of the first incident surface 4A is such that the image height of each light beam (the light beam of non-reflective illumination light) emitted from the point light source 2A and transmitted through the first incident surface 4A on the illuminated surface 9 is the optical axis L of each light beam. The shape is changed as follows according to the angle (emitting angle) with respect to. That is, the shape of the first incident surface 4A is such that the image height increases as the emission angle increases within a range from 0 ° (coincidence with the optical axis L) to a predetermined angle of each light beam. If the angle is exceeded, the image height decreases as the exit angle increases. By forming the shape of the first incident surface 4A in this way, the illuminance on the peripheral side of the illumination range by the non-reflective illumination light on the illuminated surface 9 can be increased, and the illumination of the illuminated surface 9 together with the reflected illumination light A uniform illuminance can be achieved.

  In the present embodiment, the predetermined emission angle is set to about 5/10 of the maximum emission angle of the non-reflective illumination incident on the first incident surface 4A. In other words, the image height of each ray increases as the emission angle of each light beam increases from 0 ° to about 5/10 of the maximum emission angle, and for each light ray having a maximum emission angle of about 5/10 or more, Conversely, the shape of the first incident surface 4A is formed so that the image height decreases as the exit angle increases.

  The illuminance distribution does not change abruptly before and after the predetermined angle (5/10 of the maximum emission angle), and the predetermined emission angle is in the range of 4/10 to 7/10 of the maximum emission angle. If it exists, it can aim at equalization | homogenization suitably, Preferably it is preferable that it is the range of 5/10 or more and 6/10 or less. As described above, by forming the shape of the first incident surface 4 so that the image height on the illuminated surface 9 decreases as the exit angle increases for light rays exceeding the predetermined exit angle, as shown in FIG. The light in the region surrounded by X in the figure (the region of the non-reflective illumination light exceeding the predetermined emission angle) is divided into the inner surface and the outer light in this region, the output surface 6 and the surface to be illuminated. 9 cross each other.

(Configuration of lighting device according to comparative example)
FIG. 16 is a diagram in which the cross-sectional view shown in FIG. 2 of the illumination lens 3 according to the embodiment of the present invention and the cross-sectional view of the illumination lens 3 ′ according to the comparative example are superimposed. The solid line shows the illumination lens 3 according to the embodiment of the present invention, and the broken line shows the illumination lens 3 ′ according to the comparative example. The curvature of the reflecting surface 5 of the illumination lens 3 according to the present invention is slightly smaller toward the concave portion 8 side (front to rear) than the reflection surface 5 ′ of the illumination lens 3 ′ according to the comparative example. .

  The shape of the illumination lens 3 ′ according to the comparative example other than the shape of the reflecting surface 5 ′ is the same as the shape of the illumination lens 3 according to the embodiment of the present invention. Moreover, the illuminating device 11 (refer FIG. 17) which concerns on a comparative example uses the light source 2 similarly to the illuminating device 1 which concerns on embodiment of this invention, and the movement range of the light source 2 is also the same as the illuminating device 1. FIG. Therefore, in the description of the illumination device 11 according to the comparative example, among the reference numerals attached to the respective members, “illumination device 11” indicating the illumination device 11 itself according to the comparative example and “illumination lens 3 ′” as a component thereof. Except for “reflecting surface 5 ′”, description will be given with reference numerals corresponding to the respective elements of lighting device 1 according to the embodiment of the present invention, and description of each element will be omitted.

(Optical path of lighting device according to comparative example)
Here, among the reflected light according to the comparative example, the light corresponding to the first reflected light P1 is referred to as the first reflected light P1 ′, and the light corresponding to the second reflected light P2 is referred to as the second reflected light P2 ′. The third reflected light P3 ′ is equivalent to the above-described third reflected light P3. Note that the irradiation angles of the first reflected light P1 ′, the second reflected light P2 ′, and the third reflected light P3 ′ from the light source 2 to the second incident surface 4B with respect to the optical axis L are the first reflection described above. It is the same as the light P1, the second reflected light P2 and the third reflected light P3.

  FIG. 17 is a cross-sectional view of the illumination device 11 for explaining the optical path of the reflected illumination light when the illumination lens 3 of the illumination device 11 is disposed at the front end position F. FIG. 18 is a diagram showing the optical paths of the first reflected light P1 ′, the second reflected light P2 ′, and the third reflected light P3 ′ shown in FIG. 17 extended from the exit surface 6 to the illuminated surface 9 1 meter ahead. is there.

  FIG. 19 is a cross-sectional view of the illuminating device 1 for explaining the optical path of the reflected illumination light when the illuminating lens 3 of the illuminating device 11 is disposed at an intermediate position M between the rear end position R and the front end position F. is there. FIG. 20 shows the optical paths of the first reflected light P1 ′, the second reflected light P2 ′, and the third reflected light P3 ′ shown in FIG. 19 extended from the exit surface 6 to the illuminated surface 9 1 meter ahead. It is.

  FIG. 21 is a cross-sectional view of the illumination device 11 for explaining the optical path of the reflected illumination light when the illumination lens 3 of the illumination device 11 is disposed at the rear end position R. FIG. 22 is a diagram showing the optical paths of the first reflected light P1 ′, the second reflected light P2 ′, and the third reflected light P3 ′ shown in FIG. 21 extended from the exit surface 6 to the illuminated surface 9 1 meter ahead. It is.

  The reflective surface 5 and the second incident surface 4B are reflected illumination emitted from the light source 2 and emitted via the incident surface 4, the reflective surface 5 ′, and the output surface 6, as can be seen from FIGS. The light emission direction is changed from one side of the optical axis L to the other side in accordance with the movement of the illumination lens 3 from the front end position F to the rear end position R (movement in which the light source 2 and the illumination lens 3 relatively approach). In addition to the shape that directs (shakes), the irradiation range (light distribution angle) is widened, and the first reflected light P 1 ′ illuminates the vicinity of the optical axis L on the illuminated surface 9. About these points, the illuminating device 1 and the illuminating device 11 are the same.

  However, in the illuminating device 11, as can be seen from FIG. 17, the reflecting surface 5 and the second incident surface 4 </ b> B have the first reflected light P <b> 1 ′ and the third reflected light 3 in the state where the illumination lens 3 is disposed at the front end position F. The reflected light P <b> 3 ′ is shaped to intersect after exiting from the exit surface 6. This is the difference between the lighting device 11 according to the comparative example and the lighting device 1 according to the embodiment of the present invention.

  In addition, the optical path of the non-reflective illumination light of the illuminating device 11 which concerns on a comparative example is the same as the optical path of the non-reflective illumination light of the illuminating device 1 which concerns on embodiment of this invention shown in FIG.12, FIG.13 and FIG.14.

(Illuminance distribution of lighting devices according to embodiments and comparative examples of the present invention)
FIG. 23 is a diagram showing an illuminance distribution when the illumination lens 3 is disposed at the front end position F in the illumination device 1 according to the embodiment of the present invention and the illumination device 11 according to the comparative example. FIG. 24 shows the illumination device 3 according to the embodiment of the present invention and the illumination device 11 according to the comparative example, when the illumination lens 3 is arranged at an intermediate position M between the rear end position R and the front end position F. It is a figure which shows illuminance distribution. FIG. 25 is a diagram illustrating an illuminance distribution when the illumination lens 3 is disposed at the rear end position R in the illumination apparatus 1 according to the embodiment of the present invention and the illumination apparatus 11 according to the comparative example. . These illuminance distributions are illuminance distributions on the illuminated surface 9 that is 1 meter away from the exit surface 6.

  23, FIG. 24, and FIG. 25 that have the letter “present invention” under the illuminance distribution (for example, (present invention-R reflected light)) are related to the embodiment of the present invention. 2 is an illuminance distribution of the lighting device 1. 21, FIG. 24, and FIG. 25, in which the letter “comparative example” is attached below the illuminance distribution (for example, (comparative example—R reflected light)), the illumination device 11 according to the comparative example Illuminance distribution.

  23, FIG. 24, and FIG. 25, in which the numeral “reflected illumination light” is attached below the illuminance distribution (for example, (Invention-R reflected illumination light)). It is an illuminance distribution of "reflective illumination light" of the illuminating device 1 which concerns on, and the illuminating device 11 which concerns on a comparative example. 23, FIG. 24, and FIG. 25 that have the letter “non-reflective illumination light” attached under the illuminance distribution (for example, (Invention-R non-reflective illumination light)). It is illumination intensity distribution of the "non-reflective illumination light" of the illuminating device 1 which concerns on the form, and the illuminating device 11 which concerns on a comparative example. Further, in FIGS. 23, 24, and 25, the characters “synthesized illumination light” attached under the illuminance distribution (for example, (the present invention-R synthesized illumination light)) are embodiments of the present invention. This is an illuminance distribution of “synthesized illumination light” obtained by synthesizing “reflected illumination light” and “non-reflective illumination light”, which is light emitted during actual use of the illumination device 1 according to the embodiment and the illumination device 11 according to the comparative example. .

  The illuminance distribution of the illuminating device 1 according to the embodiment of the present invention is such that the illuminance of the synthesized light is greater than that of the illuminating device 11 according to the comparative example, particularly when the illumination lens 3 is disposed at the intermediate position M or the rear end position R. It can be seen that the distribution is uniform and the change in illuminance distribution is smooth. Here, as shown in FIG. 24, when the illumination lens 3 is arranged at the intermediate position M, the illumination range of the synthesized illumination light of the illumination device 1 is almost uniformly bright, whereas the synthesized illumination light of the illumination device 11 It can be seen that the bright range is limited to a slightly central portion of the entire illumination range. This tendency also appears in the illuminance distribution when the illumination lens 3 is arranged at the rear end position R as shown in FIG.

  This reason can be easily understood by comparing FIG. 8 and FIG. 20 showing the optical path of the reflected illumination light when the light source 2 is arranged at the intermediate position M. FIG. The third reflected light P3 of the illumination device 1 takes an optical path at the outer edge of the illumination range far from the optical axis L as compared to the third reflected light P3 'of the illumination device 11 (see FIGS. 8 and 20). As for the light intensity, the first reflected light P1, P1 'is the strongest, the third reflected light P3, P3', and the weakest light is the second reflected light P2, P2 '. The illuminating device 1 distributes the optical path of the third reflected light P3 to the outer side (the second reflected light P2 side) of the third reflected light P3 'of the illuminating device 11. That is, the illumination device 1 distributes the third reflected light P3 so as to compensate for the illuminance of the second reflected light P2, which is light with low illuminance. In contrast, the second reflected light P <b> 2 ′ of the illumination device 11 is distributed toward the center of the illumination range as compared to the second reflected light P <b> 2 of the illumination device 1. Therefore, the illuminance distribution shown in FIG. 24 is different.

  Such a characteristic of the optical path of the illuminating device 1 is also seen when the illuminating lens 3 is disposed at the rear end position R (see FIGS. 10, 22 and 25). This is one reason why the illuminance distribution of the illuminating device 1 is uniform compared to the illuminating device 11 according to the comparative example. The feature of the optical path of the illumination device 1 is that the first reflected light P1 and the third reflected light P3 do not intersect after being emitted from the emission surface 6 in a state where the illumination lens 3 is disposed at the front end position F. Thus, it has been clarified by the inventor's earnest study that the second incident surface 4B and the reflecting surface 5 can be obtained by setting the shapes thereof.

  FIG. 26 is a diagram illustrating the relationship between the relative movement amount of the light source 2 and the illumination lens 3 and the light distribution angle of the illumination device 1 in the illumination device 1 according to the embodiment of the present invention. When the light distribution angle is about 10 ° and the coordinate a has a relative movement amount of 0 mm, the illuminance distribution according to the embodiment of the present invention shown in FIG. 23 is obtained. When the light distribution angle is about 25 ° and the coordinate b is about 1.5 mm, the illuminance distribution according to the embodiment of the present invention shown in FIG. 24 is obtained. Further, when the light distribution angle is about 40 ° and the coordinate c is about 3 mm, the illuminance distribution according to the embodiment of the present invention shown in FIG. 25 is obtained. The light distribution angle is preferably 10 ° or more and 40 ° or less. If the light distribution angle is less than 10 ° or exceeds 40 °, the uniformity of illuminance tends to deteriorate. In FIG. 26, the amount of movement exceeding 3 mm is indicated by a broken line, but this is data assuming that the lighting device 1 cannot move but the movement exceeding 3 mm is possible.

(Main effects obtained by the embodiment of the present invention)
The cam mechanism 31 included in the illuminating device 1 sets the relative movement amount of the light source 2 and the illumination lens 3 to 3 mm in the range of 90 ° of the rotation angle of the lens holding cylinder 22. The relative movement amount 3 mm is the maximum value of the relative movement amount between the light source 2 and the illumination lens 3. The range of the rotation angle of 90 ° substantially coincides with the range (around 90 °) in which a person can easily rotate with one twist without applying a heavy load on the wrist or arm. For example, when the lighting device 1 is installed on the bedside, the lens holding tube 22 is often rotated in an unnatural posture. Therefore, operability can be improved by making it possible to change the entire illumination range of the illumination device 1 with one hand within a range of rotation angles of around 90 °.

  FIG. 27 is a diagram showing the relationship between the emission efficiency at which the light emitted from the light source 2 is emitted from the illumination lens 3 and the relative movement amount between the light source 2 and the illumination lens 3. In FIG. 27, the emission efficiency with respect to the relative movement amount when the emission efficiency when the relative movement amount between the light source 2 and the illumination lens 3 is 1.5 mm (light distribution angle 25 °) is set as a reference (= 1). It is shown.

  It can be seen that the illumination device 1 can keep the reduction of the emission efficiency within 10% over the entire range of the light distribution angle from the narrow angle (relative movement amount = 0 mm) to the wide angle (relative movement amount = 3.0 mm). Note that a decrease in the output efficiency on the narrow-angle side causes the light to leak due to an increase in the distance between the light source 2 and the illumination lens 3, and a decrease in the output efficiency on the wide-angle side causes the reflector surface to approach the illumination lens 3. This happens because the total internal reflection is broken and light leaks. In FIG. 27, the amount of movement exceeding 3 mm is indicated by a broken line, but this is data assuming that the lighting device 1 cannot move but the movement exceeding 3 mm is possible.

  The illumination device 1 according to the embodiment of the present invention can change the distance between the light source 1 and the illumination lens 3 within a predetermined range along the optical axis L. By changing this distance, the illumination device 1 The illumination device can change the illumination range of illumination light emitted from the lens 3. The illumination lens 3 reflects the incident surface 4 on which the light emitted from the light source 2 enters the illumination lens 3 and a part of the light incident on the illumination lens 3 from the incident surface 4 toward the illumination direction. A reflecting surface 5 as a concave reflecting surface, and an exit surface 6 that emits light incident from the entrance surface 4 toward the illumination direction.

  The incident surface 4 has an opening 7 formed on the side on which the light source 2 is disposed so that light from the light source 2 can enter, and an inner surface of a recess 8 that is recessed in a direction opposite to the direction in which the light source 2 is disposed. The first incident surface 4A and the second incident surface 4B are formed. The first incident surface 4A is a condensing lens surface that is disposed on the bottom surface of the concave portion 8 and has a convex surface on the light source 2 side so as to condense light from the light source 2. The second incident surface 4B is an inner surface of the concave portion 8 formed around the optical axis of the illumination lens 3 so that the light from the light source 2 can be transmitted toward the reflecting surface 5.

  4 A of 1st entrance planes are the light which permeate | transmits 4 A of 1st entrance planes, and radiate | emits from the output surface 6 among main illumination lights, as the light source 2 and the lens 3 for illumination move relatively. It is a shape that increases the light distribution angle of the non-reflective illumination light. The reflective surface 5 and the second incident surface 4B are the following (1) with respect to the reflected illumination light that is the main illumination light that is transmitted through the second incident surface 4B, reflected by the reflective surface 5, and emitted from the exit surface 6. (2) A shape that satisfies the conditions of (3).

(1) As the light source 2 and the illumination lens 3 move relative to each other, the emission direction of the reflected illumination light emitted from the emission surface 6 is relative to the emission position of the reflected illumination light on the emission surface 6. Then, it is inclined toward the opposite side across the optical axis 2.
(2) The light distribution angle of the reflected illumination light is increased as the light source 2 and the illumination lens 3 move in a relatively approaching direction.
(3) First reflected light reflected by the reflecting surface 5 in a state where the light source 2 and the illumination lens 3 are farthest within a predetermined range (the illumination lens 3 is disposed at the front end position F). Of P1, the second reflected light P2, and the third reflected light P3, the first reflected light P1 illuminates the surface 9 to be illuminated closest to the optical axis L. That is, the first reflected light P1 illuminates the vicinity of the optical axis L on the illuminated surface 9.

  Since the illuminating device 1 has the above-described configuration, even when the spot diameter of the illumination is changed by changing the distance between the light source 2 and the illumination lens 3, the illuminance spots and the illuminance are irrespective of the spot diameter. It can be set as illumination with little change of distribution.

  Moreover, in the illuminating device 1 which concerns on embodiment of this invention, the output angle with respect to the optical axis L of the light until it reaches | attains the 2nd entrance plane 4B from the light source 2 among the reflected illumination light reflected on the reflective surface 5 is the minimum. Is the first reflected light P1, and the light having the maximum emission angle with respect to the optical axis L from the light source 2 to the second incident surface 4B is the second reflected light P2. When the outgoing angle with respect to the optical axis L of the light until reaching 4B is the intermediate between the first reflected light P1 and the second reflected light P2 as the third reflected light P3, the reflecting surface 5 and the second incident surface 4B has a shape in which the first reflected light P1 and the third reflected light P3 do not intersect after being emitted from the emission surface 6 in a state where the light source 2 and the illumination lens 3 are farthest from each other within a predetermined range. .

  When the illumination device 1 has the above-described configuration and changes the illumination range by changing the distance between the light source 2 and the illumination lens 3, as shown in FIGS. 23 to 25, the illuminance distribution of the illumination range The illumination range can be changed while suppressing the occurrence of spots.

  Further, as shown in FIGS. 24 and 25, the illumination intensity distribution of the main illumination light on the surface to be illuminated 9 is obtained by effectively complementing the illuminance of the dark part generated in the central portion of the reflected illumination light with the non-reflective illumination light. The present inventor has found out that they can be made more uniform through intensive studies.

  As shown in FIGS. 24 and 25, when the illumination lens 3 is disposed at the intermediate position M or the rear end position R, the illuminance distribution of the reflected illumination light on the surface to be illuminated 9 has a low illuminance at the center. It becomes. On the other hand, the illuminance distribution on the illuminated surface 9 of the non-reflective illumination light transmitted through the first incident surface 4A is higher at the center side. Therefore, the illuminating device 1 can make the illuminance distribution of the main illumination light uniform by supplementing the low-illuminance portion of the central portion of the reflected illumination light with the non-reflective illumination light on the illuminated surface 9. However, if the illuminance at the central portion of the non-reflective illumination light is too high, the illuminance distribution of the main illumination light cannot be suitably made uniform.

  Therefore, the first incident surface 4A of the illumination device 1 according to the embodiment of the present invention has a higher image height as the emission angle becomes larger in a range where the emission angle of the light beam passing through the first incident surface 4A reaches a predetermined angle. If the predetermined output angle exceeds a predetermined output angle, the image height is decreased as the output angle increases. As a result, the non-reflective illumination light has an increased illuminance on the peripheral side while suppressing an increase in illuminance on the center side of the illumination range on the illuminated surface 9. For this reason, when the portion with low illuminance distribution in the central portion of the reflected illumination light is supplemented with non-reflective illumination, the illuminance on the peripheral side can be increased while appropriately increasing the illuminance at the central portion. Therefore, the illuminance distribution on the illuminated surface 9 of the entire main illumination light can be preferably made uniform.

(Other forms)
The lighting device 1 according to the embodiment of the present invention described above is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention. It is.

  For example, the cam mechanism 31 included in the illuminating device 1 sets the relative movement amount of the light source 2 and the illumination lens 3 to 3 mm in the range of 90 ° of the rotation angle of the lens holding tube 22. The relative movement amount 3 mm is the maximum value of the relative movement amount between the light source 2 and the illumination lens 3.

  However, the relative movement amount 3 mm may not be the maximum value of the relative movement amount between the light source 2 and the illumination lens 3. The relative movement amount can be 2 mm or more and 4 mm or less when the rotation angle of the lens holding cylinder 22 is in the range of 60 ° to 120 °. When obtaining a desired illumination range and illuminance distribution, if the distance between the light source 2 and the illumination lens 3 is less than 2 mm, it is necessary to increase the effectiveness of the illumination lens 3 (with a small amount of movement). The range must be variable), and it is necessary to form the illumination lens 3 with a small diameter and a large thickness. Then, sink marks and the like at the time of molding of the illumination lens 3 are likely to occur, and molding becomes difficult. On the other hand, if the relative movement amount between the light source 2 and the illumination lens 3 exceeds 4 mm, the diameter of the illumination lens 3 increases, and in addition, it becomes difficult to obtain a desired illumination range and illuminance distribution.

  Further, when the rotation angle of the lens holding tube 22 is less than 60 °, the ratio of the relative movement amount of the light source 2 and the illumination lens 3 with respect to the rotation amount of the lens holding tube 22 is larger than that when the rotation angle is 60 ° or more. The adjustment of the relative movement amount between the light source 2 and the illumination lens 3 becomes severe and difficult to operate. On the contrary, when the rotation angle of the lens holding tube 22 exceeds 120 °, it is difficult to perform an operation of rotating the lens holding tube 22 with one twist with one hand.

  Further, the cam mechanism 31 may be configured such that the relative movement amount between the light source and the illumination lens is 2.5 mm or more and 3.5 mm or less in the range of the rotation angle of the lens holding cylinder 22 from 60 ° to 120 °. . By doing in this way, the said effect (The effect which suppresses the sink at the time of shaping | molding of the lens 3 for illumination, and the effect that the lens 3 for illumination becomes easy to obtain a desired illumination range and illumination intensity distribution) becomes more preferable.

  Further, the cam mechanism 31 has a rotation angle of the lens holding cylinder 22 within a range of 90 ° ± 10 °, and a relative movement amount between the light source and the illumination lens is 2 mm or more and 4 mm or less, or 2.5 mm or more and 3.5 mm or less. It is also good to do. In this way, when the person rotates the lens holding tube 22 with one hand, the adjustment of the relative movement amount between the light source 2 and the illumination lens 3 does not become severe, and the wrist and arm are large. Easy to rotate with a twist without applying a load.

  Moreover, it is good also as a structure which arrange | positions a fly eye lens in the output surface 6 of the illuminating device 1 which concerns on embodiment of this invention. FIG. 28 is a diagram showing an illuminance distribution when an illumination lens of an illumination apparatus according to a modification in which a fly-eye lens is disposed on the exit surface 6 of the illumination apparatus 1 according to the embodiment of the present invention is disposed at the front end position F. It is. FIG. 29 is a diagram illustrating an illuminance distribution when the illumination lens of the illumination device according to the modification is disposed at an intermediate position M between the rear end position R and the front end position F. FIG. 30 is a diagram illustrating an illuminance distribution when the illumination lens of the illumination device according to the modification is disposed at the rear end position R. FIG. These illuminance distributions are illuminance distributions on the illuminated surface 9 that is 1 meter away from the exit surface 6.

  Here, in FIG. 28, FIG. 29 and FIG. 30, the ones with the letter “variation” attached under the illuminance distribution (for example, (variation-R reflected illumination light)) are the embodiments of the present invention. It is an illumination intensity distribution of the illuminating device of the modification which concerns on this.

  Also, in FIGS. 28, 29 and 30, those with the letter “reflected light” attached under the illuminance distribution (for example, (variant-R reflected illumination light)) are included in the embodiment of the present invention. It is an illuminance distribution of “reflected illumination light” of the illumination device of the modification. Also, in FIGS. 28, 29, and 30, those with the letter “non-reflective illumination light” attached under the illuminance distribution (for example, (Modification—R non-reflective illumination light)) are illuminations of the modification. It is an illuminance distribution of “non-reflective illumination light” of the apparatus. Further, in FIGS. 28, 29, and 30, the characters “synthesized illumination light” attached under the illuminance distribution (for example, (modified example-R synthesized illumination light)) are those of the illumination device of the modified example. It is an illuminance distribution of “synthesized illumination light” obtained by synthesizing “reflected illumination light” and “non-reflective illumination light”, which is light emitted in actual use.

  28, 29 and 30 also show the illuminance distribution of the illumination device 1 according to the embodiment of the present invention so that the effect of the fly-eye lens can be easily confirmed. The illuminance distribution of the lighting device 1 is a reproduction from FIGS. 23, 24, and 25, respectively.

  It can be seen that the change in the illuminance distribution is smoother by arranging the fly-eye lens on the exit surface 6 so that the emitted light is transmitted through the fly-eye lens.

  The illumination lens 3 can be moved along the optical axis L from the front end position F farthest from the light source 2 to the rear end position R where the light source 2 approaches the first incident surface 4A and enters the recess 8. It is said. That is, the range in which the illumination lens 3 moves is from the position where the light source 2 is disposed outside the recess 8 to the position where the light source 2 enters the recess 8. However, the range in which the illumination lens 3 moves may be limited to a range in which the light source 2 is disposed outside the recess 8 or may be limited to a range in which the light source 2 is disposed in the recess 8.

  Further, although LED chip parts are used for the light source 2, other light emitting elements such as an organic EL may be used, and the shape of the light emitting elements may be leaded parts instead of chip parts.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light source 3 Illumination lens 4 Incident surface 5 Reflecting surface 6 Outgoing surface 7 Opening 8 Recessed portion 22 Lens holding tube 23 Fixed tube 31 Cam mechanism 33 Cam groove 34 Cam follower

Claims (6)

The distance between the light source and the illumination lens can be changed within a predetermined range along the optical axis, and the illumination range of the illumination light emitted from the illumination lens can be changed by changing the distance. A lighting device,
A fixed cylinder for holding the light source;
A lens holding cylinder for holding the illumination lens;
A cam mechanism capable of varying a distance in a direction along the optical axis between the light source and the illumination lens by rotating the lens holding tube about the optical axis;
Have
The cam mechanism has a rotation angle of the lens holding cylinder in a range of 60 ° or more and 120 ° or less, and a relative movement amount of the light source and the illumination lens is 2 mm or more and 4 mm or less.
A lighting device characterized by that. The lighting device of claim 1.
The cam mechanism has a rotation angle of the lens holding cylinder in a range of 60 ° to 120 °, and a relative movement amount of the light source and the illumination lens is set to 2.5 mm to 3.5 mm.
A lighting device characterized by that. The lighting device according to claim 1 or 2,
The illumination lens is
An incident surface on which light emitted from the light source enters the illumination lens;
A concave reflecting surface that reflects a part of the light incident into the illumination lens from the incident surface toward the illumination direction;
And an exit surface that emits light incident from the entrance surface toward the illumination direction,
The entrance surface has an opening formed on the side where the light source is disposed so that light from the light source can enter and is formed on the inner surface of a recess recessed in a direction opposite to the direction in which the light source is disposed. A first incident surface and a second incident surface,
The first incident surface is a condensing lens surface that is disposed on the bottom surface of the concave portion and has a convex surface on the light source side to condense light from the light source,
The second incident surface is an inner surface of the concave portion formed around the optical axis of the illumination lens so that light from the light source can be transmitted toward the reflective surface.
The first incident surface is light that passes through the first incident surface and is emitted from the emission surface, out of main illumination light, as the light source and the illumination lens move in a relatively approaching direction. It is a shape that increases the light distribution angle of non-reflective illumination light,
The reflective surface and the second incident surface are the following (1) with respect to the reflected illumination light that is the main illumination light that is transmitted through the second incident surface, reflected by the reflective surface, and emitted from the exit surface. (2) It is a shape that satisfies the conditions of (3).
An illumination lens characterized by that.
(1) As the light source and the illumination lens move in a relatively approaching direction, the exit direction of the reflected illumination light exiting from the exit surface becomes the exit position of the reflected illumination light on the exit surface. On the other hand, it is inclined toward the opposite side across the optical axis.
(2) The light distribution angle of the reflected illumination light is increased as the light source and the illumination lens move in a relatively approaching direction.
(3) Of the reflected illumination light reflected by the reflecting surface, the light having the smallest irradiation angle with respect to the optical axis until reaching the second incident surface from the light source is defined as the first reflected light. The light having the maximum irradiation angle with respect to the optical axis until reaching the second incident surface is defined as second reflected light, and the light irradiation angle with respect to the optical axis from the light source until reaching the second incident surface. However, when the intermediate light between the first reflected light and the second reflected light is the third reflected light, the light source and the illumination lens are farthest from each other within the predetermined range. Among the first to third reflected lights, the first reflected light illuminates the vicinity of the optical axis most on the surface to be illuminated. The lighting device according to claim 3.
The reflecting surface and the second incident surface are formed such that the first reflected light and the third reflected light are in the state where the light source and the illumination lens are farthest from each other within the predetermined range. It is a shape that does not intersect after exiting from
A lighting device characterized by that. The lighting device according to claim 3 or 4,
The first incident surface has an image height that increases as the exit angle increases within a range where the exit angle of the light beam passing through the first entrance surface reaches a predetermined angle. It is a shape that lowers the image height as the angle increases,
A lighting device characterized by that. ,
In the illuminating device of any one of Claim 1 to 5,
An illumination device, wherein a fly-eye lens is disposed on the exit surface of the illumination lens.