JP6755600B2 - Stand type lighting device - Google Patents

Description

The present invention relates to a stand-type lighting device such as a desk lamp.

In recent years, LEDs having excellent power saving have been used as a light source of a stand-type lighting device (for example, a desk lamp) that is arranged or attached to a desk or a palace of a bed with a palace.
As such an electric stand, it has a lamp body provided with an LED for a light source and a light reflecting means provided above the LED, and the optical axis of the LED is defined to be upward from the horizontal and light reflected. A translucent LED cover is provided on the radiation side of the LED so as to intersect with the means, and the diffused light generating means is provided in a range in which light directly directed from the LED to the irradiated surface (irradiated object) passes through the LED cover. (For example, Patent Document 1) has been proposed in which the LED is provided to reduce glare and the occurrence of multiple shadows due to direct light from the LED.

Japanese Unexamined Patent Publication No. 2015-138766

Since the above-mentioned desk lamp is provided with diffused light generating means on the LED cover corresponding to the range in which the light directly directed from the LED to the object to be irradiated passes, the amount of light directly directed to the object to be irradiated is reduced and the object to be irradiated is irradiated. There is a problem that the illuminance of the LED is reduced.
An object of the present invention is to provide a stand-type lighting device capable of suppressing a decrease in the illuminance of an object to be irradiated while suppressing the glare of the emitted light of an LED during use.

The stand-type illuminating device according to the present invention is a stand-type illuminating device that irradiates an object to be irradiated with a light source unit composed of one or a plurality of LEDs and light incident from the light source unit on the object to be irradiated. A first optical unit that emits light toward the subject, and a tubular resin-made second optical unit that has a protruding portion that protrudes toward the object to be irradiated from the light transmitting portion through which the light is transmitted in the first optical unit. The second optical unit has irregularities on the inner peripheral surface of the protruding portion, which are provided along the central axis of the second optical unit and have a triangular wavy shape in a cross section orthogonal to the central axis.
The stand-type illuminating device according to the present invention is a stand-type illuminating device that irradiates an object to be irradiated with a light source unit composed of one or a plurality of LEDs and light incident from the light source unit on the object to be irradiated. The second optical unit has a first optical unit that emits light toward the light source and a resin-made second optical unit that has a tubular shape and accommodates the first optical unit in the middle of the tubular axial direction. The inner peripheral surface on the front side of the first optical unit has irregularities that are provided along the central axis of the second optical unit and have a triangular wavy shape in a cross section orthogonal to the central axis.
The stand-type illuminating device according to the present invention is a stand-type illuminating device that irradiates an object to be irradiated with a light source unit composed of one or a plurality of LEDs and light incident from the light source unit on the object to be irradiated. Made of resin having a first optical portion that emits light toward the tube, a tubular portion that accommodates the first optical portion, and an inner peripheral surface that reflects light emitted from the first optical portion toward the tubular portion. It has a second optical unit, and the second optical unit has irregularities on the inner peripheral surface that are provided along the central axis of the tubular portion and have a triangular wavy shape in a cross section orthogonal to the central axis.

According to the above configuration, since it has the second optical unit, it is possible to suppress the glare of the emitted light of the LED during use, and because it has the first optical unit, it is possible to suppress the decrease in illuminance of the irradiated object.

It is a perspective view of the desk lamp which concerns on 1st Embodiment. It is a perspective view which looked at the disassembled state of the lamp body which concerns on 1st Embodiment from the back side. It is a perspective view which looked at the disassembled state of the lamp body which concerns on 1st Embodiment from the front side. It is a vertical sectional view of the lamp body which concerns on 1st Embodiment. It is sectional drawing of the lamp body which concerns on 1st Embodiment. It is a figure which looked at the 1st optical member which concerns on 1st Embodiment from the back side. (A) is a view of the second optical member according to the first embodiment viewed from the front side, and (b) is a view of the second optical member according to the first embodiment viewed from the back side. It is a figure explaining the positional relationship of the 1st optical member and the 2nd optical member which concerns on 1st Embodiment. It is a figure explaining the optical path, (a) is the case where the 1st optical member and the 2nd optical member have no unevenness, and (b) is the case where the 1st optical member and the 2nd optical member have unevenness. It is a perspective view of the desk lamp which concerns on 2nd Embodiment. It is sectional drawing of the lamp body which concerns on 2nd Embodiment. It is a vertical sectional view of the lamp body which concerns on 2nd Embodiment. It is a figure explaining the positional relationship of the 1st optical member and the 2nd optical member which concerns on 2nd Embodiment. It is a perspective view of the desk lamp which concerns on 3rd Embodiment. It is a vertical sectional view of the lamp body which concerns on 3rd Embodiment. It is a perspective view which looked at the disassembled state of the lamp body which concerns on 3rd Embodiment from the back side.

<Overview>
The stand-type illuminating device according to the embodiment is a stand-type illuminating device that irradiates an object to be irradiated with a light source unit composed of one or a plurality of LEDs and light incident from the light source unit on the object to be irradiated. A first optical unit that emits light toward the target, and a second optical unit that suppresses the light emitted from the first optical unit toward the existence prediction region of the user's eye from reaching the existence prediction region of the eye. Has. Here, the "user's eye presence prediction area" is an area in which the range in which the adult male's eyes exist is predicted, assuming that the adult male normally uses it.
In the stand-type lighting device according to the embodiment, the first optical unit is composed of a light transmitting unit that transmits light from the light source unit, and the second optical unit is closer to the irradiated object side than the light transmitting unit. It is composed of protruding portions.
In the stand-type lighting device according to the embodiment, the light transmittance of the protruding portion is lower than the light transmittance of the light transmitting portion.
In the stand-type lighting device according to the embodiment, the protruding portion has irregularities on the surface on the light transmitting portion side.
In the stand-type lighting device according to the embodiment, the light transmitting portion is composed of the flat plate portion of the first optical member having a flat plate portion made of a translucent resin, and the protruding portion is a second optical having a tubular portion. It is composed of the tubular portion of the member, the light source portion is arranged on one end side of the tubular portion, and the flat plate portion is arranged inside the tubular portion and in the middle in the central axial direction of the tubular portion.

<First Embodiment>
1. 1. A schematic description will be given with reference to FIG.
The desk lamp 1, which is an example of the stand-type lighting device, is arranged on, for example, the upper surface (installation surface) of the top plate 3 of the desk, and irradiates the object to be irradiated on the upper surface of the top plate 3. The desk lamp 1 includes a base 5 arranged on the top plate 3, an arm 7 erected from the base 5, and a lamp body 9 provided at the tip of the arm 7. The desk lamp 1 is used by being connected to a commercial power source via an adapter (not shown) incorporating a lighting circuit for normally lighting the lamp body 9.
The base 5 has a flat box shape. The base 5 includes a switch (including a switch circuit) for lighting the LED unit 92, which is a light source unit of the lamp body 9, and a weight (not shown) for stably arranging the desk lamp 1.

The arm 7 has a long box shape. The arm 7 is rotatably attached to the base 5 around a vertical axis orthogonal to the installation surface, for example, as shown by an arrow A in FIG. The arm 7 is rotatably attached to the base 5 around a first horizontal axis parallel to the installation surface, for example, as shown by an arrow B in FIG. The arm 7 has a housing portion 73 into which the front side portion of the second optical member 94, which will be described later, fits when the lamp body 9 is folded with respect to the arm 7. Specifically, the accommodating portion 73 is a recess. When accommodating the second optical member 94, a magnet may be provided in each contact portion where the arm 7 and the lamp body 9 are in contact with each other so that the arm 7 can be reliably accommodated.
The lamp body 9 has a long shape. The lamp body 9 is rotatably attached to the arm 7 around the second horizontal axis, for example, as shown by an arrow C in FIG. The second horizontal axis is parallel to the lateral direction of the arm. The lamp body 9 is rotatably attached to the arm 7 around an orthogonal axis orthogonal to the second horizontal axis, for example, as shown by an arrow D in FIG. The side on which light is emitted from the lamp body 9 is the front side.

2. 2. The lamp body 9 has a housing portion attached to the arm 7, a light source portion composed of a plurality of LEDs, and a first optical unit that emits most of the light incident from the light source portion toward the object to be irradiated. The unit and the light emitted from the first optical unit toward the presence prediction region side of the eye where the user's eye will be located when the electric stand 1 is used are suppressed from reaching the existence prediction region of the eye. It has two optical units. The first optical unit emits light incident from the light source unit toward the above-mentioned irradiation target, and also emits light toward a region other than the irradiation target including the presence prediction region of the user's eyes. ..
The first optical unit is composed of a light transmitting portion that transmits light from the light source unit, and the second optical unit is composed of a protruding portion located on the irradiated target side of the light transmitting portion on the irradiated target side. There is. The light transmittance of the protruding portion is lower than the light transmittance of the light transmitting portion, and the protruding portion has a light diffusion region (here, unevenness) on the surface on the light transmitting portion side.

This will be described in detail below.
As shown in FIGS. 2 to 5, the lamp body 9 includes a housing 91 that functions as a housing unit, an LED unit 92 that functions as a light source unit, and a first optical member 93 that functions as a first optical unit. , A second optical member 94 having a function as a second optical unit. The tubular portion 94a of the second optical member 94 also has a function as a protruding portion.

(1) Case This will be described mainly with reference to FIGS. 2 to 5.
The housing 91 has a space inside. An electric cable (not shown) that connects the light source unit and the switch circuit inside the base 5 is arranged using this space. In some cases, a part or all of the lighting circuit may be accommodated. The housing 91 is a combination of the back housing 96 and the front housing 97.

(1-1) Back housing The back housing 96 has an open front side and a long box shape. The back housing 96 has a plurality of mounting portions for the front housing 97. Here, an engaging means is adopted as a mounting means. Therefore, the mounting portion is composed of the engaging projection 96d formed on the side wall 96c (see FIG. 3).
The back housing 96 has a plurality of fixing portions for fixing the LED unit 92, the front housing 97, and the tubular second optical member 94 to the back housing 96. Here, a screwing means is adopted as a fixing means. Therefore, the fixing portion is composed of a boss 96e formed on the back wall 96b and a screw hole 96f provided on the boss 96e. The base of the boss 96e has a positioning protrusion 96g for positioning the LED unit 92 (see FIG. 3).
The back housing 96 has a mounting portion that is mounted on the arm 7. The mounting portion is composed of a cylindrical portion 96i (see FIGS. 2 and 3) extending outward from the side wall 96h. In addition. An electric cable passes through the inside of the cylindrical portion 96i.
The back housing 96 has a pair of ribs 96j on the inner surface of the side wall 96h. The pair of ribs 96j has a function of securing a wiring space for an electric cable and reinforcing the periphery of the cylindrical portion 96i (see FIG. 3).

(1-2) Front housing The front housing 97 has an open back side and a long box shape. The front housing 97 is inserted inside the back housing 96. The front housing 97 has a mounting portion for mounting the second optical member 94 on the front wall 97b. Here, the back side portion of the second optical member 94 is mounted in a state of being fitted to the front housing 97. Therefore, the mounting portion is composed of a recessed portion 97c that is recessed from the front wall 97b.

The shape of the recessed portion 97c when viewed from the front side (the side from which light is emitted from the LED unit 92) is the same as the shape of the outer circumference when the second optical member 94 is viewed from the front side. The recessed portion 97c is composed of a recessed peripheral wall 97d extending in a tubular shape from the front wall 97b to the back side, and a recessed bottom wall 97f provided at the back side end of the recessed peripheral wall 97d and having an opening 97e.
Here, the LED unit 92 is arranged between the recessed bottom wall 97f and the back wall 96b of the back housing 96 (see FIG. 5). Therefore, the opening 97e is provided so as not to block the light emitted from the LED unit 92. The LEDs 921 of the LED unit 92 are arranged in a straight line, and the openings 97e have an oval shape as a whole. To be precise, in order to insert the screw member for fixing the second optical member 94, the opening extends outward from both ends in the longitudinal direction of the oval shape (“97 g” in FIGS. 2 and 3). ) Or, it extends outward from both ends of the oval shape in the lateral direction corresponding to the overhanging portion 94h of the second optical member 94 (“97h” in FIGS. 2 and 3 and is a recessed portion. There is.)

The recessed peripheral wall 97d has a plurality of reinforcing ribs 97j on the outer surface. The reinforcing rib 97j protrudes to the back side of the recessed bottom wall 97f. The tip of the reinforcing rib 97j is located outside the substrate 922 of the LED unit 92 in the lateral direction, and regulates the displacement of the LED unit 92 in the lateral direction.
The recessed bottom wall 97f has a regulating portion that regulates the misalignment of the LED unit 92. Here, a fitting means is adopted as a regulating means. Therefore, the regulating portion is composed of protrusions 97k formed on the recessed bottom wall 97f (see FIG. 2).

The front housing 97 has a plurality of mounting portions for the back housing 96. Here, as described above, the engaging means is adopted as the mounting means. Therefore, the mounting portion is composed of an engaging hole 97m formed in the side wall 97n (see FIGS. 2 and 3).
The front housing 97 has a protrusion 97p on the front wall 97b that fits into the through hole 922d of the substrate 922 of the LED unit 92, and a notch 97r for a pair of ribs 96j of the back housing 96 on the side wall 97q. (See FIG. 2).

(2) LED unit This will be described with reference to FIGS. 2 and 3.
The LED unit 92 includes a plurality of LEDs 921 (see FIG. 3) and a substrate 922 on which the plurality of LEDs 921 are mounted. The plurality of LEDs 921 are arranged linearly here. The substrate 922 has a long shape. The substrate 922 has through holes 922a, 922c, and 922d. The through holes 922a are provided at both ends of the substrate 922 in the longitudinal direction, and are holes for fitting the boss 96e (back housing 96). The through holes 922c and 922d are for fitting the protrusions 97k and 97p (front housing 97) for controlling misalignment.

(3) First Optical Member This will be described with reference to FIGS. 2, 3, 5, and 6.
The first optical member 93 is made of a translucent resin material. As the resin material, for example, by using a transparent material such as polycarbonate, the illuminance of the object to be irradiated can be increased.
The first optical member 93 has at least a flat plate portion 93a. The first optical member 93 here has a collar portion 93b extending from the outer peripheral edge portion of the flat plate portion 93a to the back side.

(3-1) Flat plate portion The first optical member 93 is arranged in the second optical member 94 with the central axis of the second optical member 94 (circular portion 94a) and the flat plate portion 93a orthogonal to each other (see FIG. 5). ).
The flat plate portion 93a has an intermediate region 93c including a region facing the LED 921 and located in the intermediate portion, and an outer peripheral region 93d located outside (outer peripheral side) of the intermediate region 93c (excluding FIG. 3). The intermediate region 93c emits light from the LED 921 incident on the region toward the object to be irradiated. To be precise, it is refracted at the time of incident and exit, but light is emitted toward the region including the irradiated object. Therefore, it is preferable that the flat plate portion 93a has a high light transmittance. As a result, the light emitted from the LED 921 toward the intermediate region 93c passes only through the intermediate region 93c and reaches the irradiated target.

The outer peripheral region 93d has a diffusion function. Specifically, the diffusion function is composed of irregularities provided on at least one of the front surface and the back surface of the outer peripheral region 93d. Here, the unevenness 93e is provided only on the back surface of the outer peripheral region 93d (the surface facing the LED 921). The unevenness 93e extends in the lateral direction of the first optical member 93 (flat plate portion 93a) and is provided along the longitudinal direction. The unevenness 93e has a triangular wavy shape in a cross section orthogonal to the lateral direction, and the unevenness is repeated in the longitudinal direction. As a result, the light emitted from the LED 921 toward the outer peripheral region 93d is diffused by the unevenness 93e, and it is possible to suppress the light emitted from the LED 921 toward the outside of the region where the irradiation target exists. That is, the amount of light directed to the outside of the irradiation target can be reduced, and the glare outside the irradiation target can be reduced.

(3-2) Flange portion The collar portion 93b has a plurality of attachment portions for attachment to the second optical member 94. Here, an engaging means is adopted as a mounting means. Therefore, the flange portion 93b is composed of an engaging projection 93g formed on the peripheral wall 93f. Two engaging protrusions 93g are provided at intervals in the portion extending along the longitudinal direction in the peripheral wall 93f, for a total of four.
The flange portion 93b has a notch 93h for forming a space on the peripheral wall 93f for arranging a screw member for fixing (integrating) the second optical member 94, the LED unit 92, and the front housing 97 to the back housing 96. doing.

(4) Second Optical Member This will be described with reference to FIGS. 2, 3, 5, and 7.
The second optical member 94 is made of a resin material. Here, the second optical member 94 is configured to be lower than the light transmittance of the flat plate portion 93a of the first optical member 93. Specifically, a resin material such as ABS is mixed with a pigment of a color that does not totally reflect (for example, gray, black, etc.). As a result, the amount of light transmitted through the second optical member 94 can be reduced. Further, since the pigment having a color that does not totally reflect has a function of absorbing light, the second optical member is a member having a lower reflectance than the first optical member.
The second optical member 94 has an oval shape when viewed from the front side, corresponding to the elongated LED unit 92. The second optical member 94 has at least a tubular portion 94a. The second optical member 94 here has a bottom portion 94b at the back end of the tubular portion 94a. The bottom 94b is provided with an opening 94c (excluding FIG. 3).
The opening 94c has an oval shape corresponding to the shape of the second optical member 94 when viewed from the front side. The opening 94c is provided so as not to block the light emitted from the LED unit 92.
The second optical member 94 accommodates the first optical member 93 in the tubular portion 94a. The intermediate region 93c of the first optical member 93 in this state is arranged at intervals on the front side with respect to the LED 921 of the LED unit 92. The first optical member 93 is arranged inside the tubular portion 94a and in the middle of the tubular portion 94a in the direction of the central axis (front and back) (see FIG. 5). As a result, the protruding portion is formed on the front side portion of the second optical member 94 with respect to the first optical member 93.

(4-1) Cylinder portion The tubular portion 94a has a diffusion function on the inner surface. The diffusion function is composed of unevenness 94e formed on the inner peripheral surface. The unevenness 94e is provided at least on the front side of the flat plate portion 93a in a state where the first optical member 93 is housed (see FIG. 5). The unevenness 94e extends in the central axis direction, repeats the unevenness along the circumferential direction, and extends in the central axis direction. The unevenness 94e has a triangular wavy shape in a cross section orthogonal to the central axis of the tubular portion 94a. As a result, the light emitted from the first optical member 93 toward the inner peripheral surface of the tubular portion 94a is diffused by the unevenness 94e, and it is possible to suppress the light emitted from the region where the irradiation target exists. That is, the amount of light directed to the outside of the irradiation target can be reduced, and the glare outside the irradiation target can be reduced.
The tubular portion 94a has a plurality of attachment portions for attaching the first optical member 93. Here, as described above, the engaging means is adopted as the mounting means. Therefore, the tubular portion 94a is composed of an engaging recess 94f formed in the peripheral wall 94d. Two engaging recesses 94f are provided at intervals in the portions extending along the longitudinal direction corresponding to the engaging protrusions 93g of the first optical member 93, for a total of four.

(4-2) Bottom The bottom 94b has a fitting convex portion 94g that fits into the opening 97e of the recessed portion 97c of the front housing 97. The fitting convex portion 94g has an oval ring shape corresponding to the shape of the opening 97e. The fitting convex portion 94g has an overhanging portion 94h that projects inward in the width direction from a substantially central position of the portion extending in the longitudinal direction. The overhanging portion 94h fits with the recessing portion 97h of the recessed portion 97c (see FIGS. 2 and 3).
When the fitting convex portion 94g is fitted into the opening 97e of the recessed portion 97c of the front housing 97, the back surface of the fitting convex portion 94g comes into contact with the substrate 922 of the LED unit 92 (see FIG. 5). When the fitting convex portion 94g is fitted into the opening 97e of the recessed portion 97c of the front housing 97, the back surface of the bottom portion 94b comes into contact with the recessed bottom wall 97f of the recessed portion 97c of the front housing 97, and the tubular portion 94a The outer peripheral surface of the recessed portion 97c abuts on the recessed peripheral wall 97d (see FIG. 5).
The bottom portion 94b has a through hole 94i through which a screw member for fixing (integrating) the second optical member 94, the LED unit 92, and the front housing 97 to the back housing 96 is inserted (FIG. 3). And Fig. 5).

3. 3. The positional relationship between the LED unit, the first optical member, and the second optical member will be described with reference to FIG.
In the cross section of the lamp body 9, the light emitting center O of the LED 921 of the LED unit 92 is located on the line segment X1. The light emitting center is the light emitting layer of the LED 921 and is the center when the LED 921 is viewed from the light emitting direction. The line segment X1 passes through the center of the second optical member 94 in the lateral direction and extends in a direction parallel to the central axis of the tubular portion 94a.
In the cross section of the lamp body 9, the angle F between the two line segments X2 connecting the light emitting center O of the LED 921 and the front end edge H1 of the tubular portion 94a of the second optical member 94 is 60 [°] or more. ing. As a result, the irradiated target can be efficiently irradiated. The angle F between the line segments X2 is preferably in the range of 50 [°] or more and 90 [°] or less. The 1/2 irradiation angle of the LED 921 is 60 [°], and the angle F is larger than this angle.
In the cross section of the lamp body 9, the angle G between the two line segments X3 connecting the light emitting center O of the LED 921 and the back edge H2 of the flat plate portion 93a of the first optical member 93 is 120 [°] or more. ing. As a result, the light emitted by the LED 921 can be effectively used. The angle G between the line segments X3 is preferably in the range of 100 [°] or more and 140 [°] or less.

In the cross section of the lamp body 9 (the cross section orthogonal to the longitudinal direction in the tubular portion 94a), the angle J between the virtual line segment X4 and the virtual line segment X5 is preferably in the range of 15 [°] or more and 30 [°] or less. .. As a result, it is possible to suppress the light emitted from the first optical member 93 toward the existence prediction region K of the user's eyes, and it is possible to reduce the glare of the user. The virtual line segment X4 is the front side (irradiated surface side) edge (the second optical member side edge) H1 of the second optical member 94 and the front edge of the first optical member 93. This is a virtual line connecting the front edge H1 of the second optical member 94 to the edge (the edge on the first optical member side) I on the far side. The virtual line segment X5 is a virtual line indicating a surface of the flat plate portion 93a of the first optical member 93 on the irradiated surface side.

It is preferable that the unevenness 94e of the tubular portion 94a of the second optical member 94 and the unevenness 93e of the outer peripheral region 93d of the first optical member 93 exist at least in the region between the line segment X2 and the line segment X3. As a result, the amount of light directed to the region not to be irradiated can be reduced. Hereinafter, it will be described with reference to FIG.
The case where the unevenness is not provided is shown in (a) of the figure.
The light 1L1 emitted from the LED 921 toward the outer peripheral region of the flat plate portion of the first optical member 993 passes through the first optical member 993 and is reflected by the inner peripheral surface of the second optical member 994. The reflected light 1L2 is emitted from the lamp body. The light 1L1 is refracted or absorbed by the first optical member 993, but most of the light passes through the first optical member 993. Further, the light reaching the second optical member 994 is incident on the inside of the second optical member 994, but most of the light is reflected. The light 1L1 emitted from the LED 921 in this way is emitted as the light 1L2 from the lamp body 904 without significantly reducing the amount of light.

On the other hand, the case where the unevenness is provided is shown in (b) of the figure.
The light L1 emitted from the LED 921 toward the outer peripheral region (93d) of the flat plate portion (93a) of the first optical member 93 is the light L11 bent by the unevenness 93e of the first optical member 93 and the inside of the first optical member 93. It is dispersed by the light L12 incident on the light L12. The light L12 that has reached the inner peripheral surface of the second optical member 94 is separated into the light L21 that is reflected by the inner peripheral surface and the light L22 that is incident on the inside of the second optical member 94. In this case, the reflected lights L11 and L21 are emitted from the lamp body 9 in different directions. The light L1 emitted from the LED 921 in this way is emitted from the lamp body 9 as the lights L11 and L21 in different directions by reducing the amount of light by reflection, absorption, or the like.

<Second embodiment>
1. 1. A schematic description will be given with reference to FIG.
The desk lamp 1A, which is an example of the stand-type lighting device, is arranged on, for example, the upper surface (installation surface) of the top plate 3 of the desk, and irradiates the object to be irradiated on the upper surface of the top plate 3. The desk lamp 1A includes a base 5A arranged on the top plate 3, an arm 7A erected from the base 5A, and a lamp body 9A provided at the tip of the arm 7A.

The base 5A has a thin box shape. The base 5A includes a switch (including a switch circuit) and a weight (not shown). The arm 7A has a long tubular shape, is erected on the base 5A, and has a structure in which the upper portion can be curved in the front-rear direction as shown by an arrow N in FIG. For example, a lighting circuit for dimming is housed in the lower part of the arm 7A.
The lamp body 9A has a long shape. The lamp body 9 is rotatably attached to the arm 7A around the vertical axis, for example, as shown by the arrow L in FIG.
2. 2. The lamp body will be described mainly with reference to FIGS. 11 and 12.
The lamp body 9A has the LED unit 92A inside the housing 91A, and the second optical member 94A in which the first optical member 93A is arranged on the inner circumference is an opening of the housing 91A which is the light outlet of the LED unit 92A. It is provided in.

(1) Housing The housing 91A has a front housing 97A and a back housing 96A having a box shape and a structure in which the box is divided into two parts, front and back. The front housing 97A and the back housing 96A are combined with their open ends abutting each other.
The back housing 96A has a recessed portion 96Aa on the back side, and the cover body 98A fits into the recessed portion 96Aa. On the surface (inner surface) of the back housing 96A, a boss 96Ab that supports the substrate 922A of the LED unit 92A from the back side and has a through hole in the center, and a screw hole for mounting the front housing 97A and having a screw hole in the center. A plurality of bosses 96Ac are provided.

The front housing 97A has a recessed portion 97Aa for the second optical member 94A. The recessed portion 97Aa has a tubular portion 97Ab and a bottom portion 97Ac. The bottom portion 97Ac is provided with an opening 97Ad which is an optical outlet. On the back surface of the front housing 97A, a plurality of embossed 97Ae corresponding to the boss 96Ac of the back housing 96A are provided. A through hole is provided at the bottom of the embossed 97Ae. The threaded portion of the screw body that inserts the through hole into the screw hole of the boss 96Ac passes through, and the head of the screw body is housed in the embossed 97Ae.
The opening end of the back housing 96A and the opening end of the front housing 97A are fitted with a fitting projection (on the front housing 97A side) 97Af and a fitting groove (back housing 96A) that are fitted to each other. On the side.) Has 96 Ad (see FIG. 11).
The cover body 98A has a boss 98Aa through which a through hole of the boss 96Ab of the back housing 96A is inserted (see FIG. 12). The boss 98Aa has a screw hole on the central axis (not shown).

(2) LED unit The LED unit 92A has a plurality of LEDs 921A and a substrate 922A. The substrate 922A is provided with a through hole for fixing (not shown). The boss 98Aa of the cover body 98A inserts the through hole. The outer peripheral portion of the surface of the substrate 922A comes into contact with the back surface of the bottom portion 97Ac of the front housing 97A.

(3) Second Optical Member The second optical member 94A has a tubular portion 94Aa that is oval when viewed from the front side, a bottom portion 94Ab provided at the back side end of the tubular portion 94Aa, and a bottom portion 94Ab from the bottom portion 94Ab to the back side. It has a fitting convex portion 94Ac that protrudes and fits into the opening 97Ad of the recessed portion 97Aa of the front housing 97A (see FIG. 11). The second optical member 94A is attached to the housing 91A so that the front side portion of the tubular portion 94Aa projects from the recessed portion 97Aa of the front housing 97A to the front side. Concavo-convex 94Ad is provided on the inner peripheral surface of the tubular portion 94Aa on the front side portion of the first optical member 93A. The back surface of the bottom portion 94Ab abuts on the surface of the bottom portion 97Ac of the recessed portion 97Aa of the front housing 97A.
The bottom portion 94Ab has a through hole corresponding to the screw hole of the boss 98Aa of the cover body 98A (not shown). The screw body (not shown) for integrally connecting the front housing 97A, the back housing 96A, the cover body 98A, and the second optical member 94A is a screw hole through which the through hole of the bottom 94Ab of the second optical member 94A is inserted. Screw in. The screw hole is formed in the boss 98Aa of the cover body 98A, and the cover body 98A abuts on the back surface of the bottom portion 94Ab of the second optical member 94.

(4) First Optical Member The first optical member 93A has a flat plate portion 93Aa and a flange portion 93Ab protruding from the outer peripheral edge portion of the flat plate portion 93Aa to the back side (see FIG. 11). The flat plate portion 93Aa has an intermediate region 93Ac including a region facing the LED 921A and an outer peripheral region 93Ad located on the outer periphery thereof. Concavo-convex 93Ae is provided on the back surface of the outer peripheral region 93Ad (see FIG. 11). In the first optical member 93A, the engaging portion on the outer surface of the flange portion 93Ab (for example, a convex portion, the illustration thereof is omitted) is an engaging portion (for example, a concave portion) of the tubular portion 94Aa of the second optical member 94A. By engaging with (not shown), it is attached to the second optical member 94A (not shown).

3. 3. The positional relationship between the LED unit, the first optical member, and the second optical member will be described with reference to FIG.
In the cross section of the lamp body 9A, the light emitting center OA of the LED 921A of the LED unit 92A is located on the line segment X1A. The line segment X1A passes through the center of the second optical member 94A in the lateral direction and extends in a direction parallel to the central axis of the tubular portion 94Aa.
In the cross section of the lamp body 9A, the angle FA between the two line segments X2A connecting the light emitting center OA of the LED 921A and the front edge H1A of the tubular portion 94Aa of the second optical member 94A is 60 [°] or more. ing. As a result, the irradiated target can be efficiently irradiated. When corresponding to the JIS standard AA type for learning, the angle FA between the line segments X2A is preferably in the range of 75 [°] or more and 105 [°] or less.
In the cross section of the lamp body 9A, the angle GA between the two line segments X3A connecting the light emitting center OA of the LED 921A and the back edge H2A of the flat plate portion 93Aa of the first optical member 93A is 120 [°] or more. ing. As a result, the light emitted by the LED 921A can be effectively used. When corresponding to the JIS standard AA type for learning, the angle GA between the line segments X3A is preferably in the range of 120 [°] or more and 150 [°] or less.

In the cross section of the lamp body 9A (the cross section orthogonal to the longitudinal direction in the tubular portion 94Aa), the angle JA between the virtual line segment X4A and the virtual line segment X5A corresponds to the JIS standard AA type for learning. A range of 10 [°] or more and 25 [°] or less is preferable. As a result, the light directed to the planned position of the user's eyes can be suppressed, and the glare of the user can be reduced. The virtual line segment X4 is a front side (irradiated target side) edge (the second optical member side edge) H1A of the second optical member 94A and a front edge of the first optical member 93A. This is a virtual line connecting the front edge H1A of the second optical member 94A to the edge (the edge on the first optical member side) IA on the side far from the front edge H1A. The virtual line segment X5A is a virtual line indicating a surface of the flat plate portion Aa of the first optical member 93A on the side to be irradiated.

<Third embodiment>
1. 1. A schematic description will be given with reference to FIG.
A desk lamp 1B, which is an example of a stand-type lighting device, includes a base 5B arranged on an installation surface, an arm 7B erected from the base 5B, and a lamp body 9B provided at the tip of the arm 7B.
The base 5B has a thin box shape. The base 5B includes a switch (including a switch circuit) and a weight (not shown). The arm 7B has a long pipe shape, and the lamp body 9B has a bendable structure (so-called flexible pipe) as shown by arrows P, Q, and R in FIG.

2. 2. The lamp body will be described mainly with reference to FIGS. 15 and 16.
The lamp body 9B has an LED unit 92B inside the housing 91B, and the second optical member 94B in which the first optical member 93B is arranged on the inner circumference is an opening of the housing 91B which is an optical outlet of the LED unit 92B. It is provided in. When the lamp body 9B is viewed from the light emitting direction of the LED unit 92B, the lamp body 9B has an oval shape, and the end portion of the lamp body 9B in the longitudinal direction is fixed to the arm 7B.

(1) Housing The housing 91B has a box shape. The housing 91B includes a box-shaped front housing 97B having an opening on the back side and a box-shaped back housing 96B having an opening on the front side, and the front housing 97B is inserted into the back housing 96B.
The front housing 97B has a circular opening 97Ba for the tubular portion 94Ba of the second optical member 94B, and a cylindrical portion 97Bb extending from the peripheral portion of the opening to the back side. The back surface (inner surface) of the front housing 97B has a boss 97Bd having a screw hole 97Bc for fixing the LED unit 92B and the second optical member 94B (see FIG. 16). When the front housing 97B is attached to the back housing 96B, the engaging portion on the inner surface of the peripheral wall of the back housing 96B (for example, a convex portion, the illustration thereof is omitted) is engaged with the outer surface of the peripheral wall of the front housing 97B. This is done by engaging a portion (eg, recess 97Be, see FIG. 16).

(2) LED unit The LED unit 92B has a plurality of LEDs 921B and a substrate 922B. The substrate 922B is provided with a through hole 922Ba for fixing. A screw body (not shown) screwed into the screw hole 97Bc of the boss 97Bd of the front housing 97B is inserted into the through hole 922Ba. The plurality of LEDs 921B are arranged on the circumference at intervals in the circumferential direction (not shown). In addition to the LED 921B, the substrate 922B is mounted with electronic components (not shown) constituting a lighting circuit for dimming the LED 921B.

(3) Second Optical Member The second optical member 94B has a tubular portion 94Ba that is circular when viewed from the front side, a plate-shaped portion 94Bb provided at the back end of the tubular portion 94Ba, and a plate-shaped portion 94Bb to the front side. It has a recess 94Bc that is recessed into the substrate 922B to accommodate (cover) the electronic components of the substrate 922B, and a flange portion 94Bd that protrudes from the outer peripheral edge portion of the plate-shaped portion 94Bb to the back side. With the plate-shaped portion 94Bb located on the back side of the front housing 97B, the tubular portion 94Ba is fitted inside the cylindrical portion 97Bb of the front housing 97B, and the back side portion projects from the opening 97Ba to the front side (see FIG. 15). ).
Concavo-convex 94Be is provided on the front side of the inner peripheral surface of the tubular portion 94Ba with respect to the first optical member 93B. The back surface of the plate-shaped portion 94Bb is in contact with the front surface of the substrate 922B of the LED unit 92B, and the flange portion 94Bd is located outside the outer peripheral edge of the substrate 922B.
The plate-shaped portion 94Bb is provided with a through hole 94Bf corresponding to the boss 97Bd of the front housing 97B. The peripheral portion of the through hole 94Bf of the plate-shaped portion 94Bb projects to the front side in a semi-cylindrical shape. The semi-cylindrical protruding portion constitutes a part of the peripheral wall of the recess 94Bc. The boss 97Bd of the front housing 97B fits into the semi-cylindrical portion (not shown).

(4) First Optical Member The first optical member 93B has a circular flat plate portion 93Ba and a flange portion 93Bb that cylindrically protrudes from the outer peripheral edge portion of the flat plate portion 93Ba to the back side. The flat plate portion 93Ba has an intermediate region 93Bc including a region facing the LED 921B, and an outer peripheral region 93Bd located on the outer periphery thereof. Concavo-convex 93Be is provided on the back surface of the outer peripheral region 93Bd. In the first optical member 93B, the engaging portion (for example, the convex portion 93Bf) on the outer surface of the flange portion 93Bb engages with the engaging portion (for example, the concave portion 94Bg) of the tubular portion 94Ba of the second optical member 94B. By doing so, it can be attached to the second optical member 94B (see FIG. 16).
3. 3. Positional relationship between the first optical member and the second optical member The positional relationship between the first optical member 93B and the second optical member 94B is such that the second optical member 94B is covered with the tubular portion 94Ba in the cross section including the central axis of the tubular portion 94Ba. The edge on the side of the second optical member on the illuminated side and the edge on the side of the first optical member 93B on the side to be irradiated and far from the edge on the side of the second optical member (edge on the side of the first optical member). ) Is inclined at an angle in the range of 10 [°] or more and 25 [°] or less with respect to the surface of the intermediate region 93Bc of the flat plate portion 93Ba of the first optical member 93B on the side to be irradiated. ing.

<Modification example>
1. 1. LED unit The arrangement of the plurality of LEDs may be other than the one-row linear shape or the one-row annular shape described in the embodiment. For example, a plurality of LEDs may be arranged in two rows and arranged in a straight line, a curved line, a ring such as an annulus or a polygonal ring, or a U-shape or a V-shape when viewed from the light emitting direction.
Although not described in the embodiment, the lighting circuit for lighting the LED unit may be provided in at least one of the base, the arm and the lamp body, or may be distributed in the base, the arm and the lamp body. .. Further, the toning function may be included in the lighting circuit by using two or more types of LEDs having different emission colors.

2. 2. The unevenness of the flat plate portion of the first optical member is provided on the surface of the flat plate portion facing the LED in the embodiment, but the unevenness may be provided only on the surface on the opposite side, or the surface on the LED side. May be on both sides of the surface on the opposite side. However, in order to allow the light emitted from the LED to pass through the flat plate portion without being reflected to the LED side, it is preferable that the surface on the LED side has irregularities.
The unevenness is provided so that the cross section of the unevenness is a triangular wave, but the cross section may have another shape. However, considering the light extraction efficiency, it is preferable that the light emitted from the LED is not easily reflected on the LED side. Such a shape includes a cone shape such as a cone or a polygonal cone having an apex on the LED side, or a triangular wavy shape.
The height difference of the unevenness, that is, the distance between the virtual surface connecting the valley (lowest point) and the virtual surface connecting the top (highest point) is 0.4 [mm] or more and 1.0. The range of [mm] or less is preferable, and the range of 0.5 [mm] or more and 0.8 [mm] or less is more preferable. The pitch of the unevenness, that is, the distance between the adjacent highest points is preferably in the range of 0.5 [mm] or more and 1.5 [mm] or less, and 0.8 [mm] or more and 1.2 [mm] or less. The range of is more preferable. The height difference and pitch of the unevenness may or may not be constant.
Further, when the emphasis is on suppressing the glare of the emitted light of the LED rather than increasing the illuminance of the object to be irradiated, for example, the flat plate portion of the first optical member may be entirely uneven.
The shape of the first optical member may have a flat plate portion, and the shape of the first optical member as a whole is an oval shape, a circular shape, a rectangular shape, a polygonal shape, an elliptical shape, or the like. May be good. The thickness of the flat plate portion may be constant, or the thickness may be changed so that the center is thin and becomes thicker toward the edges. For example, the thickness of the flat plate portion may be adjusted so that the flat plate portion has a lens function.

3. 3. The unevenness of the tubular portion of the second optical member is provided so that the cross section of the unevenness is a triangular wave, but the cross section may have another shape. However, in consideration of the light extraction efficiency, a shape is preferable so that the light emitted from the flat plate portion is not reflected on the flat plate portion side. Such a shape includes a cone such as a cone or a polygonal pyramid having an apex on the central axis side of the tubular portion, or a triangular wavy shape. The unevenness of the tubular portion may be on the back side of the flat plate portion of the first optical member.
The height difference of the unevenness, that is, the distance between the virtual surface connecting the valley (lowest point) and the virtual surface connecting the top (highest point) is 0.3 [mm] or more 1.2. The range of [mm] or less is preferable, and the range of 0.4 [mm] or more and 0.9 [mm] or less is more preferable. The pitch of the unevenness, that is, the distance between the adjacent highest points is preferably in the range of 0.5 [mm] or more and 1.5 [mm] or less, and 0.8 [mm] or more and 1.2 [mm] or less. The range of is more preferable. The height difference and pitch of the unevenness may or may not be constant.
Further, the depth of the groove-shaped dent located between the adjacent protrusions may change in the stretching direction. For example, the groove-shaped recess has an apex (highest point) at one end in the stretching direction (for example, the end on the first optical member side) and the center between both ends in the stretching direction, and the other end in the stretching direction. It may be formed so that there is a valley (lowest point).

The shape of the second optical member may have a tubular portion, and the shape as a whole is not particularly limited. The tubular portion may have an elliptical shape, a circular shape, a rectangular shape, a polygonal shape, an elliptical shape, or the like when viewed from the stretching direction on the central axis side. The distance between the inner peripheral surfaces of the tubular portion may change as it moves from one end to the other end on the central axis. For example, the distance between the inner peripheral surfaces may be increased as the distance from the back side end located on the back side to the front side end located on the front side on the central axis is increased to cover a wide range, or the central axis may be irradiated from the back side end to the front side. The distance between the inner peripheral surfaces may be reduced as it moves to the end, and a narrow range may be targeted for irradiation.
The tubular portions 94a, 94Aa, 94Ba in the embodiment are made of a material having a lower light transmittance than the flat plate portions 93a, 93Aa, 93Ba. However, the tubular portion may be made of the same material as the flat plate portion or a material having a higher light transmittance than the flat plate portion. In this case, by forming a reflective film on the inner surface of the tubular portion, it is possible to suppress the transmission of light in the tubular portion.
The tubular portion is provided so as to project from the housing in the direction in which the LED light is emitted, but the front end portion of the tubular portion may be flush with the housing. That is, it suffices that the flat plate portion exists at a position moved to the back side from the front end portion of the cylinder portion with respect to the cylinder portion.

4. Flat plate portion and tubular portion In the embodiment, the tubular portions 94a, 94Aa, 94Ba and the flat plate portions 93a, 93Aa, 93Ba are configured as separate members, but they may be configured as one member, or the tubular portion may be one of the housings. It may be configured as a part.
Although the flat plate portions 93a, 93Aa, 93Ba in the embodiment are arranged inside the tubular portions 94a, 94Aa, 94Ba, they may be arranged on one end side of the tubular portion and outside the tubular portion. However, the tubular portion needs to be located closer to the irradiation target side than the flat plate portion.

5. In the embodiment of the stand-type lighting device, a desk lamp that is mounted on the top plate of a desk and used as an example of the stand-type lighting device is described. However, these stand-type lighting devices may be arranged around the bed and placed on a cabinet or the like, or may be placed on a workbench. The desk lamp of the embodiment has a base, but it suffices if the lighting device can be installed (mounted) at the destination, and a clip is provided instead of the base so that it can be attached to a machine such as a table or a lathe, a treatment table, or the like. May be good.

1 Desk lamp 9 Lamp 91 Housing 92 LED unit (light source)
93 First optical member 93a Flat plate portion 93c Intermediate region 93d Outer peripheral region 93e Concavo-convex 94 Second optical member 94a Cylinder 94e Concavo-convex

Claims (2)

In a stand-type lighting device that illuminates an object to be irradiated
A light source unit composed of one or more LEDs and
A first optical unit that emits light incident from the light source unit toward the irradiated object, and
It has a tubular shape and has a second optical portion made of resin that accommodates the first optical portion in the middle in the axial direction of the cylinder.
The second optical unit is a stand type provided along the central axis of the second optical unit and having a triangular wavy unevenness on the inner peripheral surface on the front side of the first optical unit in a cross section orthogonal to the central axis. Lighting device. In a stand-type lighting device that illuminates an object to be irradiated
A light source unit composed of one or more LEDs and
A first optical unit that emits light incident from the light source unit toward the irradiated object, and
It has a resin-made second optical portion having a tubular portion for accommodating the first optical portion and an inner peripheral surface for reflecting light emitted from the first optical portion toward the tubular portion.
The second optical unit is a stand-type lighting device provided along the central axis of the tubular portion and having irregularities on the inner peripheral surface having a triangular wavy shape in a cross section orthogonal to the central axis.

Images