JP6740094B2 - Lighting equipment - Google Patents

Description

The present invention relates to a lighting device.

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

Japanese Patent Laid-Open No. 10-69801

Such an illuminating device is often used for a reading light or the like beside the bed, and thus is often operated with one hand while lying on the bed. Therefore, an object of the present invention is to provide a lighting device that is excellent in operability when operated with one hand.

In order to achieve the above object, the illuminating device of the present invention can change the distance between the light source and the illuminating lens within a predetermined range along the optical axis, and the light is emitted from the illuminating lens by changing the distance. A lighting device capable of changing the illumination range of illumination light, wherein a fixed barrel for holding a light source, a lens holding barrel for holding a lens for illumination, and a lens holding barrel rotated about an optical axis, A cam mechanism capable of varying the distance between the light source and the illuminating lens in the optical axis direction, wherein the cam mechanism has a rotation angle of the lens holding cylinder in the range of 60° to 120°, The relative movement amount between the light source and the illumination lens is set to 2 mm or more and 4 mm or less.

Here, the cam mechanism may set the relative movement amount of the light source and the illumination lens to 2.5 mm or more and 3.5 mm or less within the range of the rotation angle of the lens holding cylinder of 60° or more and 120° or less.

In order to achieve the above object, the illuminating device of the present invention can change the distance between the light source and the illuminating lens within a predetermined range along the optical axis, and the light is emitted from the illuminating lens by changing the distance. A lighting device capable of changing the illumination range of illumination light, wherein a fixed barrel for holding a light source, a lens holding barrel for holding a lens for illumination, and a lens holding barrel rotated about an optical axis, A cam mechanism capable of varying the distance between the light source and the illuminating lens in the optical axis direction, wherein the cam mechanism has a rotation angle of the lens holding cylinder in the range of 60° to 120°, The relative movement amount between the light source and the illuminating lens is set to 2 mm or more and 4 mm or less, and the illuminating lens has an incident surface on which the light emitted from the light source enters the illuminating lens and an incident surface from which the light enters the illuminating lens. It has a concave reflecting surface that reflects a part of the light toward the illumination direction, and an emission surface that emits the light incident from the incident surface toward the illumination direction, and the light source is arranged on the incident surface. Has a first entrance surface and a second entrance surface formed on the inner surface of a recess having an opening through which light from the light source can enter and recessed in a direction opposite to the direction in which the light source is arranged. The first incident surface is a condenser lens surface that is disposed on the bottom surface of the concave portion and has a convex surface on the light source side so as to condense the light from the light source. The second incident surface has the light from the light source. The first entrance surface is a direction in which the light source and the illuminating lens are relatively close to each other, which is an inner side surface of a recess formed around the optical axis of the illuminating lens so that the light can be transmitted toward the reflecting surface. Of the main illumination light, the light distribution angle of the non-reflecting illumination light, which is the light that passes through the first incident surface and exits from the exit surface, increases as the main illumination light moves. Of the main illumination light, the following (1), (2), and (3) may be applied to the reflected illumination light that is the light that passes through the second incident surface, is reflected by the reflecting surface, and is emitted from the emitting surface. ..
(1) As the light source and the illuminating lens move relatively closer to each other, the emission direction of the reflected illumination light emitted from the emission surface is aligned with the optical axis with respect to the emission position of the reflected illumination light on the emission surface. Incline toward the opposite side of the sandwich.
(2) The light distribution angle of the reflected illumination light is increased as the light source and the illuminating lens relatively move.
(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 from the light source to the second incident surface is reflected. The second reflected light has the maximum irradiation angle with respect to the optical axis of the light until reaching the second reflected light, and the irradiation angles with respect to the optical axis of the light from the light source to the second incident surface are the first reflected light and the second reflected light. When an intermediate light is used as the third reflected light, the first reflected light among the first to the third reflected light is in the state where the light source and the illumination lens are farthest from each other within a predetermined range. Illuminates the illuminated surface closest to the optical axis.

Further, the reflecting surface and the second incident surface do not intersect with each other 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 apart within a predetermined range. It may be a shape.

The first incident surface increases the image height as the exit angle of the light beam passing through the first entrance surface increases up to a predetermined angle, and when the exit angle exceeds the predetermined angle, the exit angle is reversed. The shape may be such that the image height becomes lower as becomes larger.

A fly-eye lens may be arranged on the exit surface of the illumination lens.
Further, the cam mechanism may set the relative movement amount of the light source and the illumination lens to 2.5 mm or more and 3.5 mm or less within the range of the rotation angle of the lens holding cylinder of 60° or more and 120° or less.

According to the present invention, it is possible to provide a lighting device having excellent 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 an AA sectional view 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. FIG. 6 is a development view of a lens holding barrel included in the lighting device according to the embodiment of the present invention, and is a diagram showing an entire cam groove formed in the lens holding barrel. The first reflected light, the second reflected light, and the third reflected light 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 front end position 3 is a cross-sectional view of the lighting device showing the optical path of FIG. It is the figure which extended the optical path of the 1st reflected light shown in FIG. 5, the 2nd reflected light, and the 3rd reflected light to the to-be-illuminated surface 1 meter ahead from an emission surface. The first reflected light, the second reflected light, and the third reflected light of the reflected illumination light when the light source is caused to emit light with the illumination lens of the illumination device according to the embodiment of the present invention arranged in the intermediate position 3 is a cross-sectional view of the lighting device showing the optical path of FIG. It is the figure which extended the optical path of the 1st reflected light shown in FIG. 7, the 2nd reflected light, and the 3rd reflected light to the illuminated surface 1 meter ahead from an emission surface. The first reflected light, the second reflected light, and the third reflected light of the reflected illumination light when the light source is caused to emit light with the illumination lens of the illumination device according to the embodiment of the present invention arranged at the rear end position It is sectional drawing of the illuminating device which shows the optical path of light. It is the figure which extended the optical path of the 1st reflected light shown in FIG. 9, the 2nd reflected light, and the 3rd reflected light to the illuminated surface 1 meter ahead from an emission surface. It is a figure which shows the aspherical extension line of the reflective surface of the illuminating lens 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 the emission surface without passing through the reflection surface. It is sectional drawing of an illuminating device which shows the optical path of non-reflection illumination light. It is sectional drawing of the illuminating device which shows the optical path of non-reflection illumination light when a light source is made to emit light in the state which has arrange|positioned the lens for illumination of the illuminating device which concerns on embodiment of this invention. It is sectional drawing of the illuminating device which shows the optical path of non-reflection illumination light when a light source is made to emit light in the state which has arrange|positioned the illuminating lens of the illuminating device which concerns on embodiment of this invention. It is a figure which shows in detail the optical path when the non-reflection illumination light which concerns on embodiment of this invention penetrates a 1st incident surface. FIG. 3 is a diagram in which the cross-sectional view of the illumination lens according to the embodiment of the present invention shown in FIG. 2 and the cross-sectional view of the illumination lens according to the comparative example are overlapped. The optical paths of the first reflected light, the second reflected light, and the third reflected light of the reflected illumination light when the light source is caused to emit light with the illumination lens of the illumination device according to the comparative example arranged at the front end position are shown. It is sectional drawing of an illuminating device. It is the figure which extended the optical path of the 1st reflected light shown in FIG. 17, the 2nd reflected light, and the 3rd reflected light to the illuminated surface 1 meter ahead from an emission surface. The optical paths of the first reflected light, the second reflected light, and the third reflected light of the reflected illumination light when the light source is caused to emit light with the illumination lens of the illumination device according to the comparative example arranged at the intermediate position are shown. It is sectional drawing of an illuminating device. It is the figure which extended the optical path of the 1st reflected light shown in FIG. 19, the 2nd reflected light, and the 3rd reflected light to the illuminated surface 1 meter ahead from an emission surface. The optical paths of the first reflected light, the second reflected light, and the third reflected light of the reflected illumination light when the light source is caused to emit light with the illumination lens of the illumination device according to the comparative example arranged at the rear end position are It is sectional drawing of the illuminating device shown. FIG. 22 is a diagram in which the optical paths of the first reflected light, the second reflected light, and the third reflected light shown in FIG. 21 are extended to the illuminated surface 1 meter ahead from the emission surface. It is a figure which shows the illuminance 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 illuminance distribution in the to-be-illuminated surface when the illumination lens 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 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 which concerns on embodiment of this invention and the illuminating device which concerns on a comparative example is arrange|positioned at a rear end position. It is a figure which shows the relationship of the relative movement amount 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 of the relative movement amount of a light source and the lens for illumination, and the emission efficiency of emitted light of the illuminating device which concerns on embodiment of this invention. It is a figure which shows the illuminance 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 on the output surface of the illuminating device which concerns on embodiment of this invention is arrange|positioned at the front end position. It is a figure which shows the illuminance distribution in the to-be-illuminated surface when the illumination lens of the illuminating device of the modification which concerns on embodiment of this invention is arrange|positioned in an intermediate position. It is a figure which shows the illuminance 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, a lighting device according to an embodiment of the present invention will be described with reference to the drawings.

(Structure of the illumination device according to the embodiment of the present invention)
FIG. 1 is a plan view of an illuminating device 1 according to an embodiment of the present invention as viewed from the exit surface side. FIG. 2 is a sectional view taken along line AA of FIG. The hatching that should be shown in FIG. 2 is omitted. The hatching is omitted also in the subsequent similar sectional views. FIG. 3 is a perspective view showing a state in which the outer casing is removed from lighting device 1 according to the embodiment of the present invention. FIG. 4 is a development view of the lens holding barrel 22 included in the lighting 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 barrel 22. In the following description, the illumination direction (arrow B) of the illumination device 1 may be referred to as the front (front side). Further, a direction opposite to the illumination direction B will be described as a rear side (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. Then, the illumination device 1 can change the illumination range of the illumination light emitted from the illumination lens 3 by changing the distance. The illumination device 1 has a fixed barrel 23 that holds the light source 2 and a lens holding barrel 22 that holds the illumination lens 3. Further, the illuminating device 1 includes a cam mechanism 31 capable of changing the distance between the light source 2 and the illuminating lens 3 in the direction along the optical axis L by rotating the lens holding cylinder 22 about the optical axis L. Have.

The lens holding cylinder 22 is inserted into an exterior cylinder (not shown), and the outer circumference of the lens holding cylinder 22 is covered by the exterior cylinder. The exterior cylinder is formed with a screw hole that penetrates the outside and the inside of the cylinder. The lens holding cylinder 22 and the exterior cylinder are integrated by screwing a screw into the screw hole. Therefore, when the lens holding cylinder 22 is rotated, the outer cylinder is grasped and operated by hand.

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

The cam mechanism 31 has 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 an equal angle around the optical axis L, and the lengths of the grooves are set so that the maximum rotation angle of the lens holding cylinder 22 is 90 degrees. The cam follower 34 is provided on the fixed barrel 23. Three cam followers 34 are provided around the optical axis L at 120° intervals so as to engage with the three cam grooves 33, respectively.

Therefore, when the lens holding barrel 22 is rotated around the optical axis L, the lens holding barrel 22 is moved to the optical axis L relative to the fixed barrel 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 barrel 22 is rotated about 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 barrel 22.

Further, 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 portion for installing the lighting device 1 on a wall, a desk, or the like. 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 by the universal joint can change the illumination direction in a state where the illumination device 1 is installed on the wall, the desk, or the like via the pedestal 36.

Further, the illumination device 1 according to the embodiment of the present invention includes a light source 2, an illumination lens 3 that receives the light emitted from the light source 2, controls the light distribution of the incident light, and emits the light. And a cam mechanism 31 for moving the objective lens 3 along the optical axis L. The light source 2 uses an LED (Light Emitting Diode) chip component. 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 has 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 is moved along the optical axis L by the action of the cam groove 33 and the cam follower 34 formed in the fixed cylinder 23. To move. As the lens holding cylinder 22 moves along the optical axis L, the distance (spacing) between the light source 2 and the illumination lens 3 changes.

In addition, in FIG. 5 and subsequent figures, the cam mechanism 31 is not shown in order to make the drawings easy to understand. A mechanism (moving mechanism) that changes the distance between the light source 2 and the illumination lens 3 along the optical axis L is formed by screwing the lens holding cylinder 22 and the fixed cylinder 23 in addition to the cam mechanism 3 described above. You can go. Alternatively, the light source 2 may be directly moved along the optical axis L. Further, both the illumination lens 3 and the light source 2 may be moved.

The illumination lens 3 has an 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 in the illumination direction B. It has a reflecting surface 5 as a concave reflecting surface for reflecting light, and an emitting surface 6 for emitting the light that has entered the illumination lens 3 from the incident surface 4 toward 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 illuminated by the illumination device 1.

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

The light source 2 emits light through the fluorescent resin that encapsulates the LED chip portion. That is, the light emitting portion 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 tracing the optical path of the illumination light. Therefore, the illumination lens 3 is designed on the basis of simulation software and the result of actual measurement so that the light emitted from the emitting portion having an area has a desired illuminance distribution on the illuminated surface 9.

Moreover, it is difficult to guide all the light emitted from the emission part of the light source 2 to a range to be illuminated (illuminated surface), and to configure the illumination lens 3 so that 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 emission portion of the light source 2 and the configuration of the illumination lens 3. Therefore, here, as the light having a great 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 used as the main illumination light, and the illuminated surface 9 of this main illumination light is used. 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, and can be incident on the incident surface 4 when the illumination lens 3 is arranged at the front end position F described later in the illumination device 1. Light is the main illumination light. In the illuminating device 1, the predetermined irradiation angle of the main illumination light is 148°. This 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, the light that enters from the second incident surface 4B, is reflected by the reflecting surface 5, and then exits from the exit surface 6 is referred to as "reflected illumination light", which is incident from the first incident surface 4A and enters the reflecting surface 5. The light emitted from the emission surface 6 without being reflected by is referred to as "non-reflection illumination light".

The distance between the light source 2 and the emission surface 6 of the illumination lens 3 can be changed by the moving mechanism 21 along the optical axis L within a predetermined range. The longer the distance between the light source 2 and the emission surface 6, the narrower the illumination range on the illuminated surface 9, and conversely, the shorter the distance between the light source 2 and the emission surface 6, the wider the illumination area on the illuminated surface 9. Further, the illumination range depends not only on the distance between the light source 2 and the emission surface 6 but also on the shape including the area of the incident surface 4 and the emission surface 6 and the like.

Therefore, the predetermined range of the distance between the light source 2 and the emitting surface 6 is such that the illuminated area on the illuminated surface 9 has a desired width according to the shape including the area of the incident surface 4 and the emitting surface 6. Is set. When the light source 2 and the emitting surface 6 are spaced apart from each other when the light source 2 and the emitting surface 6 have the narrowest illumination range in the desired illumination range and the illumination range is the widest. The distance between the light source 2 and the emission surface 6 is such that the light source 2 and the emission 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 that has entered the illumination lens 3 from the second incident surface 4B toward the illumination direction B. Then, in the illumination lens 3, along the optical axis L, the first incident surface 4A comes closest to the light source 2 from the front end position F where the first incident surface 4A is farthest from the light source 2, and the light source 2 enters the concave portion 8. It is possible to move to the rear end position R where it is arranged.

(Optical Path of Illumination Light in Illumination Device According to 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 arranged at the front end position F. FIG. 5 is a cross-sectional view of the illuminating device 1 shown in FIG. 2 with some light rays of reflected illumination light added.

The main illumination light emitted from the illuminating device 1 is emitted with a light distribution of a rotation target around the optical axis L. For easy understanding of the drawings and the description, 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 is shown 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 above-described method of FIGS. 5 and 6 is the same for FIGS. 7, 8, 9, 10, 11, 17, 17, 19, 20, 21, and 22 described later. To do.

Here, the first reflected light P1, the second reflected light P2, and the third reflected light P3 are the lights of the reflected illumination light reflected by the reflecting surface 5 that are emitted from the light source 2 and enter the second incident surface 4B. The output 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 value between the first reflected light P1 and the second reflected light P2 is defined as the third reflected light P3.

When the illumination lens 3 is arranged at the front end position F, the emission angle of the first reflected light P1 with respect to the optical axis L is approximately 26°, the emission angle of the second reflected light P2 with respect to the optical axis L is approximately 74°, and The emission 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 differ depending on the distance between the illumination lens 3 and the light source 2. That is, in the illuminating device 1, when the illuminating lens 3 is arranged at the rear end position R, the emission angle of the first reflected light P1 with respect to the optical axis L is approximately 38°, and the emission angle with respect to the optical axis L of the second reflected light P2. 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°.

Further, when the illumination lens 3 is arranged at the intermediate position M, the emission angle of the first reflected light P1 with respect to the optical axis L is approximately 30°, and the emission angle of the second reflected light P2 with respect to the optical axis L is approximately 74°. The emission 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 have to be the exact center (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 separated from the emitting surface 6 by about 1 meter, 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 emission surface 6 to the illuminated surface 9 approximately 1 meter away. It should be noted that the illuminated surface 9 is not limited to the 1 meter, but may 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. For example, when the lighting device 1 is used as a bedside reading lamp, a predetermined distance of about 1 meter can be set, and when the lighting device 1 is used as indoor lighting for illuminating the floor from the ceiling. A predetermined distance can be around 2.5 emails. Further, when the lighting device 1 is used to illuminate a painting displayed on the wall surface from the ceiling side, a predetermined distance can be set to about 2 meters.

7 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 arranged at the intermediate position M which is a position between the rear end position R and the front end position F. Is. FIG. 8 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. 7 extended from the emission surface 6 to the illuminated surface 9 1 meter away.

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 arranged 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 extended from the emission surface 6 to the illuminated surface 9 1 meter away.

The reflecting surface 5 and the second incident surface 4B are shaped so as to satisfy the following conditions (1), (2) and (3).

Condition (1)
The reflecting surface 5 and the second incident surface 4B are emitted from the light source 2 and are seen from FIGS. 5, 6, 7, 8, 9, and 10, and the incident surface 4, the reflecting surface 5, and the emitting surface 6 The direction of emission of the reflected illumination light emitted via the light is changed as the light is moved from the front end position F of the illumination lens 3 to the rear end position R (movement of the light source 2 and the illumination lens 3 relatively approaching each other). The shaft L is shaped to be inclined from one side to 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 of the illumination lens 3 to the rear end position R (the light source 2 and the illumination lens 3). And (relatively moving closer to each other), the light distribution angle (irradiation range) of the reflected illumination light emitted from the emission surface 6 is widened.

Condition (3)
Of the first reflected light P1, the second reflected light P2, and the third reflected light P3 that are reflected by the reflecting surface 5 in the state where the illumination lens 3 is arranged at the front end position F, the first reflected light P1 is The illumination surface 9 illuminates the closest point to the optical axis L. That is, the first reflected light P1 illuminates the surface 9 to be illuminated near the optical axis L.

The illumination lens 3 used in the illumination device 1 is configured to satisfy the following conditions. That is, as shown in FIG. 11, the light source 2 is located at the apex 5B on the aspherical extension line 5A of the reflecting surface 5 arranged on the optical axis L (depicted by an alternate long and short dash line in an arc shape in FIG. 11). When 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. Is set to 55° or more and 65° or less, the aspherical shape of the reflecting surface 5 and the angle of the second incident surface 4B with respect to the optical axis L are set.

Further, as can be seen from FIGS. 5 and 6, the reflecting surface 5 and the second incident surface 4B generate the first reflected light P1 and the third reflected light P3 when the illumination lens 3 is arranged at the front end position F. It is shaped so as not to intersect after being emitted from the emission surface 6.

Further, the first incident surface 4A is shaped so that the light distribution angle of the non-reflected illumination light increases as the light source 2 and the illumination lens 3 move in a direction relatively approaching each other.

FIG. 12 is a non-reflecting illumination light that is incident from the first incident surface 4</b>A and is emitted from the emission surface 6 without passing through the reflection surface 5 when the illumination lens 3 of the illumination device 1 is arranged at the front end position F. 3 is a cross-sectional view of the illumination device 1 showing the optical path of FIG. FIG. 12 is a sectional view of the illuminating device 1 shown in FIG. 2 with an optical path of non-reflecting illumination light added. The method illustrated in FIG. 12 is the same for FIGS. 13 and 14 described later.

FIG. 13 is a cross section of the illumination device 1 showing the optical path of the non-reflecting illumination light when the illumination lens 3 of the illumination device 1 is arranged at the intermediate position M which is a position between the rear end position R and the front end position F. It is a figure. FIG. 14 is a cross-sectional view of the illumination device 1 showing the optical path of the non-reflecting illumination light when the illumination lens 3 of the illumination device 1 is arranged at the rear end position R.

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

The shape of the first incident surface 4A is such that the image height of each light ray (light ray of non-reflecting 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 ray. The shape is changed as follows according to the angle (emission angle) with respect to. That is, the shape of the first incident surface 4A is such that the image height becomes higher as the emission angle becomes larger within a range in which the emission angle of each light ray is from 0° (corresponding to the optical axis L) to the predetermined angle, and the predetermined emission is performed. On the contrary, when the angle is exceeded, the image height becomes lower as the output angle becomes larger. By thus forming the shape of the first incident surface 4A, it is possible to increase the illuminance on the peripheral side of the illumination range by the non-reflected illumination light on the illuminated surface 9, and the illumination of the illuminated surface 9 in combination with the reflected illumination light. Uniform illuminance can be achieved.

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

It should be noted that the illuminance distribution does not suddenly change before and after the predetermined angle (5/10 of the maximum emission angle), and the predetermined emission angle is within the range of 4/10 or more and 7/10 or less of the maximum emission angle. If so, uniform illuminance can be suitably achieved, and it is preferably in 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 becomes lower as the output angle of the light ray exceeding the predetermined output angle becomes larger, as shown in FIG. In the area surrounded by X in the figure (the area of the non-reflected illumination light that exceeds the predetermined emission angle), the inner and outer rays within this area are the emission surface 6 and the illuminated surface. 9 and 9 cross each other.

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

The shape of the illuminating lens 3 ′ according to the comparative example other than the shape of the reflecting surface 5 ′ is the same as the shape of the illuminating lens 3 according to the embodiment of the present invention. Further, the illumination device 11 according to the comparative example (see FIG. 17) uses the light source 2 similarly to the illumination device 1 according to the embodiment of the present invention, and the movement range of the light source 2 is the same as that of the illumination device 1. Therefore, in the description of the illumination device 11 according to the comparative example, among the reference numerals assigned to the respective members, the “illumination device 11” indicating the illumination device 11 itself according to the comparative example and the “illumination lens 3′” of the component thereof. Except for the "reflecting surface 5'", description will be given with the reference numerals corresponding to the respective elements of the illumination device 1 according to the embodiment of the present invention, and description of the respective elements will be omitted.

(Optical path of lighting device according to comparative example)
Here, among the reflected lights according to the comparative example, one corresponding to the above-mentioned first reflected light P1 is referred to as first reflected light P1′, and one corresponding to the above-mentioned second reflected light P2 is referred to as second reflected light P2′. Then, what corresponds to the above-mentioned third reflected light P3 is referred to as a third reflected light P3′. 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 respectively the above-mentioned first reflection light. It is the same as the light P1, the above-mentioned second reflected light P2, and the above-mentioned third reflected light P3.

FIG. 17 is a 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 arranged 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 extending from the exit surface 6 to the illuminated surface 9 1 meter away. 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 arranged at an intermediate position M intermediate between the rear end position R and the front end position F. is there. 20 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. 19 extended from the emission surface 6 to the illuminated surface 9 1 meter ahead. Is.

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 arranged at the rear end position R. 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 away. Is.

As can be seen from FIGS. 17, 19 and 21, the reflecting surface 5 and the second incident surface 4B are reflected lights emitted from the light source 2 and emitted via the incident surface 4, the reflecting surface 5′ and the emitting surface 6. The emission direction of light changes from one side of the optical axis L to the other side as the illumination lens 3 moves from the front end position F to the rear end position R (movement of the light source 2 and the illumination lens 3 relatively approaching each other). In addition to being directed (shaken), the irradiation range (light distribution angle) is widened, and the first reflected light P1′ illuminates the vicinity of the optical axis L on the illuminated surface 9. In these respects, the illumination device 1 and the illumination 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 4B have the first reflected light P1′ and the third reflected light P1′ in the state where the illuminating lens 3 is arranged at the front end position F. The reflected light P3′ is shaped so as to intersect with each other after being emitted from the emission 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.

The optical path of the non-reflective illumination light of the illumination device 11 according to the comparative example is the same as the optical path of the non-reflective illumination light of the illumination device 1 according to the embodiment of the present invention shown in FIGS. 12, 13 and 14.

(Illuminance distribution of illumination 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 arranged 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 a case where the illumination lens 3 is arranged at an intermediate position M between the rear end position R and the front end position F in the lighting device 1 according to the embodiment of the present invention and the lighting device 11 according to the comparative example. It is a figure which shows the illuminance distribution of. FIG. 25 is a diagram showing an illuminance distribution when the light source 2 has the illumination lens 3 arranged at the rear end position R in the illumination device 1 according to the embodiment of the present invention and the illumination device 11 according to the comparative example. .. These illuminance distributions are illuminance distributions on the illuminated surface 9 1 meter away from the exit surface 6.

23, FIG. 24, and FIG. 25 that have the letters “present invention” attached below the illuminance distribution (for example, (present invention-R reflected light), etc., relate to the embodiment of the present invention. It is an illuminance distribution of the illuminating device 1. In addition, in FIG. 21, FIG. 24, and FIG. 25, the one in which the letters “comparative example” are attached below the illuminance distribution (for example, (comparative example-R reflected light), etc., is the same as that of the illumination device 11 according to the comparative example. The illuminance distribution.

In addition, in FIGS. 23, 24, and 25, the one in which the number “reflected illumination light” is attached below the illuminance distribution (for example, (the present invention-R reflected illumination light), etc. is an embodiment of the present invention. 3 is an illuminance distribution of “reflected illumination light” of the illumination device 1 according to Example 1 and the illumination device 11 according to the comparative example. In addition, in FIGS. 23, 24, and 25, those in which the characters “non-reflective illumination light” are added below the illuminance distribution (for example, (the present invention-R non-reflective illumination light), etc. are the embodiments of the present invention. 3 is an illuminance distribution of "non-reflective illumination light" of the illumination device 1 according to the embodiment and the illumination device 11 according to the comparative example. Further, in FIG. 23, FIG. 24, and FIG. 25, the one in which the letters “composite illumination light” is added below the illuminance distribution (for example, (the present invention-R composite illumination light), etc. is an embodiment of the present invention. 2 is an illuminance distribution of “combined illumination light” that is light that is emitted when the illumination device 1 according to Example 1 and the illumination device 11 according to the comparative example are actually used, that is, “reflective illumination light” and “non-reflective illumination light”. ..

The illuminance distribution of the illuminating device 1 according to the embodiment of the present invention is such that when the illuminating lens 3 is arranged at the intermediate position M or the rear end position R, the illuminance of the combined light is higher than that of the illuminating device 11 according to the comparative example. It can be seen that the distribution is uniform and the illuminance distribution changes smoothly. Here, as shown in FIG. 24, when the illumination lens 3 is arranged at the intermediate position M, the illumination range of the combined illumination light of the illumination device 1 is almost uniformly bright, whereas the combined illumination light of the illumination device 11 is substantially uniform. It can be seen that the bright area is limited to the bright area only in the central part of the whole illuminated area. 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.

The reason for this is easy to understand by comparing FIG. 8 and FIG. 20, which show the optical path of the reflected illumination light when the light source 2 is arranged at the intermediate position M. The third reflected light P3 of the illuminating device 1 takes an optical path at the outer edge of the illumination range farther from the optical axis L than the third reflected light P3' of the illuminating device 11 (see FIGS. 8 and 20). Regarding the light intensity, the first reflected lights P1 and P1' are the strongest, the third reflected lights P3 and P3' are next, and the weakest lights are the second reflected lights P2 and P2'. The lighting device 1 distributes the optical path of the third reflected light P3 to the outside (the second reflected light P2 side) of the third reflected light P3' of the lighting device 11. That is, the illuminating device 1 distributes the third reflected light P3 so as to supplement the illuminance of the second reflected light P2, which is light with low illuminance. On the other hand, the second reflected light P2' of the illuminating device 11 is distributed more toward the center side of the illumination range than the second reflected light P2 of the illuminating device 1. Therefore, the illuminance distribution shown in FIG. 24 is different.

Such characteristics of the optical path of the illumination device 1 are also seen when the illumination lens 3 is arranged at the rear end position R (see FIGS. 10, 22, and 25). This is one of the reasons why the illuminance distribution of the illumination device 1 becomes more uniform than that of the illumination device 11 according to the comparative example. The characteristic of the optical path of the illuminating 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 arranged at the front end position F. It was revealed by the inventor's earnest studies that it can be obtained by setting the shapes of the second incident surface 4B and the reflecting surface 5 as described above.

FIG. 26 is a diagram showing 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 of the illumination device 1 according to the embodiment of the present invention. When the light distribution angle is about 10° and the relative movement amount is the coordinate a of 0 mm, the illuminance distribution according to the embodiment of the present invention shown in FIG. 23 is obtained. Further, when the light distribution angle is about 25° and the relative movement amount is the coordinate b of 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 relative movement amount is the coordinate c of 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. When the light distribution angle is less than 10° or exceeds 40°, the uniformity of illuminance tends to deteriorate. Note that in FIG. 26, the amount of movement that exceeds 3 mm is indicated by a broken line, but this is data that is assumed to be a case in which movement is impossible with the lighting device 1, but movement that exceeds 3 mm is possible.

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

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

It can be seen that the illumination device 1 can reduce the reduction of the emission efficiency within 10% in 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). The decrease in emission efficiency on the narrow-angle side causes the light source 2 and the illuminating lens 3 to be spaced apart from each other so that light leaks, and the decrease in emission efficiency on the wide-angle side causes the light source 2 to approach the illuminating lens 3 to cause reflection on the reflector surface. It happens because the total reflection at the point is broken and light leaks. Note that, in FIG. 27, the amount of movement that exceeds 3 mm is indicated by a broken line, but this is data that is assumed to be a case in which movement is impossible with the lighting device 1, but movement that exceeds 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 along the optical axis L within a predetermined range, and by changing this distance, The illumination device is capable of changing the illumination range of the illumination light emitted from the lens 3. The illumination lens 3 reflects an 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. The reflecting surface 5 is a concave reflecting surface, and the emitting surface 6 emits the light incident from the incident surface 4 toward the illumination direction.

The incident surface 4 has an opening 7 formed on the side where the light source 2 is arranged so that light from the light source 2 can enter, and an inner surface of a concave portion 8 that is recessed in a direction opposite to the direction in which the light source 2 is arranged. It has a first incident surface 4A and a second incident surface 4B which are formed on the. The first incident surface 4A is a condenser lens surface which 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 side 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.

The first incident surface 4A is the light of the main illumination light that passes through the first incident surface 4A and is emitted from the emission surface 6 as the light source 2 and the illumination lens 3 move in a direction relatively approaching each other. This is a shape that increases the light distribution angle of the non-reflecting illumination light. The reflection surface 5 and the second incidence surface 4B are the following (1) with respect to the reflection illumination light which is the light of the main illumination light that is transmitted through the second incidence surface 4B, reflected by the reflection surface 5, and emitted from the emission surface 6. It is a shape that satisfies the conditions (2) and (3).

(1) As the light source 2 and the illuminating lens 3 move relatively closer 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. , Tilt toward the opposite side of the optical axis 2.
(2) The light distribution angle of the reflected illumination light is increased as the light source 2 and the illuminating lens 3 move in a direction relatively approaching each other.
(3) First reflected light reflected by the reflecting surface 5 in a state where the light source 2 and the illuminating lens 3 are most distant from each other within a predetermined range (the illuminating lens 3 is arranged at the front end position F). Of the P1, the second reflected light P2, and the third reflected light P3, the first reflected light P1 illuminates the illuminated surface 9 closest to the optical axis L. That is, the first reflected light P1 illuminates the surface 9 to be illuminated near the optical axis L.

Since the illumination device 1 has the above-described configuration, even when the distance between the light source 2 and the illumination lens 3 is changed to change the spot diameter of the illumination, the unevenness of the illuminance and the illuminance are irrespective of the spot diameter. It is possible to provide illumination with little change in distribution.

Further, in the illumination device 1 according to the embodiment of the present invention, among the reflected illumination light reflected by the reflection surface 5, the emission angle of the light from the light source 2 to the second incident surface 4B with respect to the optical axis L is the minimum. The first reflected light P1 is defined as 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 defined as the second reflected light P2. When the emission angle of the light with respect to the optical axis L before reaching 4B is an intermediate value 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 exiting from the exit surface 6 in a state where the light source 2 and the illuminating lens 3 are farthest apart within a predetermined range. ..

When the illumination device 1 has the above-mentioned 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. It is possible to change the illumination range while suppressing the occurrence of spots.

Further, as shown in FIGS. 24 and 25, the illuminance distribution of the main illumination light on the illuminated surface 9 is effectively supplemented by the non-reflecting illumination light to effectively supplement the illuminance of the dark portion occurring in the central portion of the reflected illumination light. The present inventor has found through diligent studies that the above can be made more uniform.

As shown in FIGS. 24 and 25, when the illumination lens 3 is arranged at the intermediate position M or the rear end position R, the illuminance distribution of the reflected illumination light on the illuminated surface 9 is such that the illuminance at the central portion is low. Becomes On the other hand, the illuminance distribution of the non-reflected illumination light transmitted through the first incident surface 4A on the illuminated surface 9 becomes higher toward the center. Therefore, the illuminating device 1 can make the illuminance distribution of the main illuminating light uniform by supplementing the low illuminance distribution at the center of the reflected illuminating light with the non-reflecting illuminating light on the illuminated surface 9. However, if the illuminance of the central portion of the non-reflecting illumination light is too high, it is not possible to preferably make the illuminance distribution of the main illumination light uniform.

Therefore, in the first incident surface 4A of the illumination device 1 according to the embodiment of the present invention, the image height increases as the emission angle increases, as long as the emission angle of the light beam passing through the first incident surface 4A is within a predetermined angle. When the output angle is increased and the output angle exceeds a predetermined output angle, the image height is decreased as the output angle is increased. As a result, the non-reflecting 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 supplementing the low illuminance distribution in the central portion of the reflected illumination light with the non-reflective illumination, the illuminance on the peripheral side can be increased while appropriately increasing the illuminance on the central portion. Therefore, the illuminance distribution on the illuminated surface 9 of the entire main illumination light can be 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 the present invention is not limited to this and various modifications can be made without departing from the scope of the present invention. Is.

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

However, this relative movement amount of 3 mm may not be the maximum value of the relative movement amount of the light source 2 and the illumination lens 3. Further, this relative movement amount can be set to 2 mm or more and 4 mm or less within the range of the rotation angle of the lens holding cylinder 22 of 60° or more and 120° or less. If the distance between the light source 2 and the illumination lens 3 is set to less than 2 mm in the case of obtaining a desired illumination range and illuminance distribution, it is necessary to increase the effectiveness of the illumination lens 3 (illumination with a slight movement amount). It is necessary to change the range), and it is necessary to form the illumination lens 3 to have a small diameter and a large thickness. Then, sink marks and the like are likely to occur at the time of molding the illumination lens 3, and the molding becomes difficult. On the contrary, when the relative movement amount between the light source 2 and the illumination lens 3 exceeds 4 mm, the diameter of the illumination lens 3 becomes large, and it becomes difficult to obtain a desired illumination range and illuminance distribution.

When the rotation angle of the lens holding cylinder 22 is less than 60°, the ratio of the relative movement amount of the light source 2 and the illumination lens 3 to the rotation amount of the lens holding cylinder 22 is larger than that of 60° or more. It becomes too difficult to adjust the relative movement amount of the light source 2 and the illumination lens 3, and it is difficult to operate. On the contrary, when the rotation angle of the lens holding barrel 22 exceeds 120°, it becomes difficult to rotate the lens holding barrel 22 with one hand with one twist.

Further, the cam mechanism 31 may set the relative movement amount of the light source and the illumination lens to 2.5 mm or more and 3.5 mm or less within the range of the rotation angle of the lens holding cylinder 22 of 60° or more and 120° or less. .. By doing so, the above effects (the effect of suppressing sink marks during molding of the illumination lens 3 and the effect of making it easier for the illumination lens 3 to obtain a desired illumination range and illuminance distribution) become more preferable.

Further, the cam mechanism 31 sets the relative movement amount of the light source and the illumination lens to 2 mm or more and 4 mm or less or 2.5 mm or more and 3.5 mm or less within the range of the rotation angle of the lens holding cylinder 22 within 90°±10°. It may be done. By doing so, when a person rotates the lens holding cylinder 22 with one hand, the relative movement amount between the light source 2 and the illumination lens 3 is prevented from being severely adjusted, and a large amount is required on the wrist or arm. Easy to rotate with one twist without load.

Further, a configuration may be adopted in which a fly-eye lens is arranged on the emission surface 6 of the illumination device 1 according to the embodiment of the present invention. FIG. 28 is a diagram showing an illuminance distribution when the illumination lens of the illumination device according to the modified example in which the fly-eye lens is disposed on the emission surface 6 of the illumination device 1 according to the embodiment of the present invention is disposed at the front end position F. Is. FIG. 29 is a diagram showing an illuminance distribution when the illumination lens of the illumination device of the modified example is arranged at an intermediate position M intermediate between the rear end position R and the front end position F. FIG. 30 is a diagram showing an illuminance distribution when the illumination lens of the illumination device of the modified example is arranged at the rear end position R. These illuminance distributions are illuminance distributions on the illuminated surface 9 1 meter away from the exit surface 6.

Here, in FIG. 28, FIG. 29, and FIG. 30, the one in which the character “variant” is added below the illuminance distribution (for example, (variant-R reflected illumination light) or the like is the embodiment of the present invention. It is an illuminance distribution of the illuminating device of the modification which concerns on.

In addition, in FIGS. 28, 29, and 30, the one in which the character “reflected light” is added below the illuminance distribution (for example, (Modification-R reflected illumination light), etc. is an embodiment of the present invention. It is an illuminance distribution of "reflection illumination light" of the illuminating device of such a modification. In addition, in FIGS. 28, 29, and 30, those in which the characters “non-reflective illumination light” are added below 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 FIG. 28, FIG. 29, and FIG. 30, the one in which the characters “composite illumination light” is added below the illuminance distribution (for example, (Modification-R composite illumination light), etc. It is the illuminance distribution of the "combined illumination light" that is a combination of the "reflected illumination light" and the "non-reflected illumination light" that is the light emitted during actual use.

Further, FIGS. 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 this lighting device 1 is reproduced from FIGS. 23, 24, and 25, respectively.

By arranging the fly-eye lens on the exit surface 6 and allowing the exit light to pass through the fly-eye lens, it can be seen that the change in the illuminance distribution is smoother.

Further, the illumination lens 3 can move along the optical axis L from a front end position F farthest from the light source 2 to a rear end position R where the light source 2 approaches the first incident surface 4A and enters the recess 8. I am trying. That is, the range in which the illumination lens 3 moves is from the position where the light source 2 is arranged 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 the range in which the light source 2 is arranged outside the recess 8 or the range in which the light source 2 is arranged in the recess 8.

Although the LED chip component is used for the light source 2, other light emitting elements such as organic EL may be used, and the shape of the light emitting element may be a leaded component or the like instead of the chip component.

DESCRIPTION OF SYMBOLS 1 Lighting device 2 Light source 3 Illumination lens 4 Incident surface 5 Reflection surface 6 Emission surface 7 Opening 8 Recess 22 Lens holding cylinder 23 Fixed cylinder 31 Cam mechanism 33 Cam groove 34 Cam follower

Claims (5)

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 tube for holding the light source,
A lens holding cylinder for holding the illumination lens,
By rotating the lens holding cylinder about the optical axis, a cam mechanism that can change the distance between the light source and the illumination lens in the direction along the optical axis,
Have
In the cam mechanism, the rotation angle of the lens holding cylinder is in the range of 60° or more and 120° or less, and the relative movement amount of the light source and the illumination lens is 2 mm or more and 4 mm or less,
The illumination lens is
An incident surface on which the light emitted from the light source enters the illumination lens,
A concave reflecting surface that reflects a part of the light entering the illumination lens from the incident surface toward the illumination direction,
An emission surface that emits light incident from the incident surface toward the illumination direction,
The incident surface has an opening formed on the side where the light source is arranged so that light from the light source can enter, and is formed on the inner surface of a concave portion that is recessed in a direction opposite to the direction in which the light source is arranged. A first incident surface and a second incident surface,
The first incident surface is a condenser lens surface that is disposed on the bottom surface of the recess and has a convex surface on the light source side so as to collect 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 reflecting surface,
The first incident surface is the main illumination light that is transmitted through the first incident surface and is emitted from the emission surface as the light source and the illuminating lens relatively move toward each other. It is a shape that increases the distribution angle of non-reflecting illumination light.
Among the main illumination light, the reflection surface and the second incidence surface are defined by the following (1) with respect to the reflection illumination light that is the light that passes through the second incidence surface, is reflected by the reflection surface, and is emitted from the emission surface. ) It is a shape that satisfies the conditions of (2) and (3),
A lighting lens characterized by the above.
(1) As the light source and the illuminating lens move relatively closer to each other, the emission direction of the reflected illumination light emitted from the emission surface becomes the emission position of the reflected illumination light on the emission surface. On the other hand, it is tilted toward the opposite side of the optical axis.
(2) The light distribution angle of the reflected illumination light is increased as the light source and the illuminating lens move relatively toward each other.
(3) Of the reflected illumination light reflected by the reflecting surface, the one having the smallest irradiation angle with respect to the optical axis from the light source to the second incident surface is defined as the first reflected light. The irradiation angle of light with respect to the optical axis until reaching the second incident surface is the second reflected light, and the irradiation angle of light with respect to the optical axis from the light source to the second incident surface is When the intermediate between the first reflected light and the second reflected light is the third reflected light, the light source and the illuminating lens are most distant from each other within the predetermined range. Of the first to third reflected light, the first reflected light illuminates the illuminated surface closest to the optical axis. The lighting device according to claim 1 ,
The reflection surface and the second incidence surface are such that the first reflected light and the third reflected light are the emission surfaces when the light source and the illuminating lens are farthest apart within the predetermined range. It is a shape that does not intersect after emitting from
A lighting device characterized by the above. The illumination device according to claim 1 or 2 ,
The first incident surface increases the image height as the emission angle increases within a range in which the emission angle of the light beam passing through the first incident surface is up to a predetermined angle, and conversely, when the emission angle exceeds the predetermined emission angle. The shape is such that the image height decreases as the angle increases,
A lighting device characterized by the above. The illumination device according to any one of claims 1 to 3 ,
An illumination device, wherein a fly-eye lens is disposed on the emission surface of the illumination lens. The illumination device according to any one of claims 1 to 4,
The cam mechanism sets a relative movement amount of the light source and the illumination lens to 2.5 mm or more and 3.5 mm or less within a range of a rotation angle of the lens holding cylinder of 60° or more and 120° or less.
A lighting device characterized by the above.