JP2020062979A - Reading light - Google Patents

Abstract

To provide a reading light that can be configured compactly as a whole, and can be improved in fitting property in a limited space.SOLUTION: A reading light 10 includes a light body 11 including an LED 41. The light body 11 is fitted to a seat 1 via a bracket 60. The light body 11 is provided with a leg part 22 which projects on an opposite side to an emission side of the LED 41 and of which tip engages with a receiving part 65 provided to the bracket 60. The light body 11 is supported by the bracket 60 so that an irradiation direction of the LED 41 is adjustable using a tip of the leg part 22 as a fulcrum.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading light including a light body including a light source, the light body being attached to a seat via a bracket, and more particularly, to a reading light mounted on a seat for a railway vehicle.

  It is known that a conventional reading light is provided, for example, on a back of a seat for a railway vehicle and irradiates a passenger with spot light. Generally, in a reading lamp, an LED as a light source and a lens for distributing spot light are respectively housed in a spherical lamp body, and the lamp body is rotatably supported in a housing so that the irradiation direction of the spot light can be adjusted. (See, for example, Patent Document 1).

JP, 2005-129354, A

  However, in the above-mentioned conventional reading lamp, since the lamp body is formed in a spherical shape so as to be easily rotated in the entire circumferential direction, not only the lamp body but also the housing for supporting the lamp body becomes bulky. Therefore, the substantial space for placing the reading light becomes large, and there is a problem in the mountability in a limited space within the backrest of the seat.

  The present invention has been made by paying attention to the problems of the above-mentioned conventional techniques, and can be configured as a whole compactly, and a reading lamp that can be easily installed in a limited space. Is intended to provide.

The gist of the present invention for achieving the above-mentioned object lies in the inventions of the following items.
[1] A reading lamp (10) including a lamp body (11) including a light source (41), the lamp body (11) being attached to a seat (1) via a bracket (60),
The lamp body (11) has a leg portion (22) protruding toward the side opposite to the emission side of the light source (41) and having a tip end engaged with a receiving portion (65) of the bracket (60),
The reading lamp (10) is characterized in that the lamp body (11) is supported by the bracket (60) so that the irradiation direction of the light source (41) can be adjusted with the tip of the leg portion (22) as a fulcrum. ).

[2] The lamp body (11) includes a base (20) for arranging the light source (41) on the front side, and a cover surrounding the light source (41) in front of the base (20) except for its irradiation range. Combining with (30),
The reading lamp (10) according to the above [1], wherein the leg portion (22) protrudes along the extension line of the optical axis of the light source (41) on the back side of the base (20).

  [3] The reading lamp (10) according to [2], wherein the base (20) is integrally formed of metal and also serves as a heat sink.

[4] The base (20) is disc-shaped, and the light source (41) is arranged at the center of the front side, while the leg portion (22) is provided at the center of the back side.
The cover (30) has a hemispherical bowl shape, and an irradiation opening (31) is provided in a cylindrical shape at a top portion of an outer periphery thereof,
The front side of the bracket (60) is formed so that the outer periphery of the cover (30) slidably contacts the inside thereof, and a guide port (63a) through which the opening (31) is movably inserted. Is provided,
The back side of the bracket (60) is formed so as to surround the back side of the base (20), and the receiving portion (65) is provided, [2] or [3]. Reading light (10).

  [5] The base (20) and the cover (30) are combined in such a manner that the opening edge (33) of the cover (30) is fitted to the outer peripheral edge of the base (20), and provided on either side. In the above [2], [3] or [4], the engaging portion (34) is fixed to each other by snap-fit engaging with the engaged portion (26) provided on the other side. Reading light (10) mentioned.

[6] The light source (41) is one LED mounted on the substrate (40),
Positioning means (27) for positioning the substrate (40) is provided on the front side of the base (20). [2], [3], [4] or [5] Reading light (10) mentioned.

[7] In front of the light source (41), a lens (50) for distributing the light incident from the light source (41) in a predetermined direction or range holds a holder (53) for holding the lens (50). Placed through
The reading lamp (10) according to [6], wherein the holder (53) is positioned together with the substrate (40) by the positioning means (27).

  [8] The substrate (40), the lens (50), and the holder (53) are mutually fixed in the lamp body (11) by fixing the base (20) and the cover (30). The reading lamp (10) according to the above [7], wherein the reading lamp (10) is held in a state of being engaged and positioned.

Next, the operation based on the above-mentioned solving means will be described.
The reading lamp (10) described in [1] includes a lamp body (11) including a light source (41), and the lamp body (11) is attached to the seat (1) via a bracket (60). In the lamp body (11), a leg portion (22) projects on the side opposite to the emission side of the light source (41). The tips of the legs (22) engage with the receiving portions (65) on the bracket (60). The lamp body (11) is supported by the bracket (60) so that the irradiation direction of the light source (41) can be adjusted with the tip of the leg portion (22) as a fulcrum.

  As a result, the lamp body (11) does not need to have a spherical overall shape as in the prior art. That is, on the side opposite to the emitting side of the light source (41), it is sufficient to locally project only the leg portion (22) from the reference plane. Therefore, the shape of the lamp body (11) can be made as compact as possible, and the bracket (60) supporting the lamp body (11) can also be downsized.

  In the reading lamp (10) described in [2], the lamp body (11) includes the base (20) on which the light source (41) is arranged on the front side, and the light source (41) on the front side of the base (20). It is combined with the surrounding cover (30) except for the irradiation range. Here, the leg portion (22) projects along the extension of the optical axis of the light source (41) on the back side of the base (20).

  As a result, it is possible to simplify the structure of the base (20) of the lamp body (11) without particularly needing to worry about the structure of the leg portion (22). Further, since the tip of the leg portion (22), which is the center of inclination of the base (20), becomes the center of rotation of the optical axis of the light source (41) as it is, adjustment of the irradiation direction of the light source (41) is easy to understand intuitively. Become.

  According to the reading lamp (10) described in [3], the base (20) is integrally formed of metal and also functions as a heat sink. This makes it possible to efficiently dissipate heat from the light source (41) and suppress the temperature rise of the light source (41).

  According to the reading lamp (10) of the above [4], the base (20) has a disc shape, and the light source (41) is arranged at the center of the front side thereof, while the leg portion (22) is arranged at the center of the back side thereof. Is provided. As described above, the base (20) basically has a simple shape in which the light source (41) can be arranged, and can be configured as compact as possible without being bulky. Further, the light source (41) and the leg portion (22) coincide with each other in the center on the front and back of the base (20), and the leg portion (22) also serves as a heat radiation fin, so that the heat radiation performance is further enhanced. You can

  The base (20) has a simple disk shape, whereas the cover (30) has a hemispherical bowl shape that can secure the internal space of the lamp body (11) and has an opening for irradiation at the top of the outer periphery thereof. The part (31) projects cylindrically. Corresponding to the cover (30), the front side of the bracket (60) is formed so that the outer periphery of the cover (30) slidably abuts on the inside thereof, so that the front side of the lamp body (11). The cover (30) forming the can be reliably held.

  Here, on the front side of the bracket (60), there is a guide opening (63a) through which an opening (31) projecting from the outer periphery of the cover (30) inside thereof is movably inserted. Therefore, the front side of the bracket (60) does not hinder the movement of the lamp body (11), and conversely, the movement of the lamp body (11) can be restricted within a desired range (guide port (63a)). it can.

  On the other hand, the back side of the bracket (60) is formed so as to surround the back side of the base (20), and the receiving portion (65) is provided at that portion. In this way, the lamp body (11) is displaceably supported between the front side and the back side of the bracket (60) with the tip of the leg portion (22) as a fulcrum.

  According to the reading light (10) described in the above [5], the base (20) and the cover (30) are arranged such that the opening edge (33) of the cover (30) is fitted to the outer peripheral edge of the base (20). Be combined. Here, in a state where the base (20) and the cover (30) are combined with each other, the engaging portion (34) provided on either one of them is snap-fit engaged with the engaged portion (26) provided on the other. It is fixed by doing. Therefore, it is not necessary to use a fixing means such as an adhesive or a screw, and the base (20) and the cover (30) can be easily assembled with only the respective structures.

  In the reading lamp (10) according to [6], the light source (41) is one LED mounted on the substrate (40), and when the substrate (40) is arranged on the front side of the base (20). Positioning means (27) for positioning is provided. Thereby, the light source (41) can be easily arranged in the lamp body (11). It is not necessary to fix the substrate (40) to the front side of the base (20).

  In the reading lamp (10) described in [7], the lens (50) on which the light from the light source (41) is incident is arranged in front of the light source (41) via the holder (53). Here, the lens (50) can be held by a holder (53), and through the lens (50), in a predetermined direction or range from an opening (31) in the cover (30) of the lamp body (11). Light distribution is possible. Further, the holder (53) is positioned together with the substrate (40) of the light source (41) by the positioning means (27). Therefore, the lens (50) and the holder (53) can be easily attached.

  According to the reading lamp (10) of the above [8], the base (20) and the cover (30) are fixed to the board (40), the lens (50), and the holder (53), so that the lamp can be read. It is held in a state of being engaged with each other and positioned in the body (11). Thereby, only by assembling the base (20) and the cover (30), the components inside the base (20) can be fixed by pressing forces that engage with each other at their respective fixed positions.

  According to the reading light of the present invention, the reading light can be made compact as a whole, and the mountability in a limited space can be improved.

It is a perspective view which decomposes | disassembles and shows the lamp body of the reading lamp which concerns on embodiment of this invention from the back. It is a perspective view which decomposes | disassembles the lamp body of the reading lamp which concerns on embodiment of this invention, and shows it from the front. It is a perspective view which shows the lamp body of the reading lamp which concerns on embodiment of this invention from the front. It is a perspective view which shows the lamp body of the reading lamp which concerns on embodiment of this invention from the back. It is a front view which shows the lamp body of the reading lamp which concerns on embodiment of this invention. It is a rear view which shows the lamp body of the reading lamp which concerns on embodiment of this invention. It is a right view which shows the lamp body of the reading lamp which concerns on embodiment of this invention. It is a top view which shows the lamp body of the reading lamp which concerns on embodiment of this invention. It is a bottom view which shows the lamp body of the reading lamp which concerns on embodiment of this invention. It is the XX sectional view taken on the line of FIG. It is a perspective view which shows the lens of the reading lamp which concerns on embodiment of this invention. It is a front view which shows the lens of the reading lamp which concerns on embodiment of this invention. Note that for convenience, the state in which the exit surface of the lens faces upward is referred to as the front surface. It is the XIII-XIII sectional view taken on the line of FIG. It is a right view which shows the lens of the reading lamp which concerns on embodiment of this invention. It is the XV-XV sectional view taken on the line of FIG. It is a top view which shows the lens of the reading lamp which concerns on embodiment of this invention. It is a bottom view which shows the lens of the reading lamp which concerns on embodiment of this invention. It is sectional drawing which shows the light distribution control of the lens in the lamp body of the reading lamp which concerns on embodiment of this invention. It is a perspective view which shows another lens of the reading lamp which concerns on embodiment of this invention. It is a front view which shows another lens of the reading lamp which concerns on embodiment of this invention. Note that, for convenience, the state in which the exit surface of the lens is directed to the left is referred to as the front. It is a left side view showing another lens of a reading lamp concerning an embodiment of the invention. It is the XXII-XXII sectional view taken on the line of FIG. It is a top view which shows another lens of the reading lamp which concerns on embodiment of this invention. It is a bottom view which shows another lens of the reading lamp which concerns on embodiment of this invention. It is a rear view which shows another lens of the reading lamp which concerns on embodiment of this invention. It is a perspective view showing a bracket of a reading light concerning an embodiment of the invention. It is a front view which shows the bracket of the reading lamp which concerns on embodiment of this invention. It is a rear view which shows the bracket of the reading light which concerns on embodiment of this invention. It is the XXIX-XXIX sectional view taken on the line of FIG. It is a left side view showing a bracket of a reading lamp concerning an embodiment of the invention. It is a right view which shows the bracket of the reading light which concerns on embodiment of this invention. It is a top view which shows the bracket of the reading lamp which concerns on embodiment of this invention. It is a bottom view which shows the bracket of the reading lamp which concerns on embodiment of this invention. It is a perspective view showing a seat provided with a reading light concerning an embodiment of the invention.

Hereinafter, embodiments representative of the present invention will be described with reference to the drawings.
1 to 34 show an embodiment of the present invention.
The reading lamp 10 according to the present embodiment is a lighting device that includes a lamp body 11 including a light source, and the lamp body 11 is attached to the seat 1 via a bracket 60. Hereinafter, a case where the reading light 10 is provided in the seat 1 for a railway vehicle will be described as an example.

<Structure of lamp body 11>
As shown in FIGS. 1 and 2, a lamp body 11 which is a main part of a reading lamp 10 includes a base 20 on which a light source is arranged on the front side, and a cover which surrounds the light source on the front side of the base 20 excluding its irradiation range. Combined with 30. The lamp body 11 is provided with a leg portion 22 which projects toward the side opposite to the emission side of the light source and whose front end engages with a receiving portion 65 (see FIG. 29) of the bracket 60 described later. The lamp body 11 is supported by the bracket 60 so that the irradiation direction (angle of the optical axis) of the light source can be adjusted with the tip of the leg portion 22 as a fulcrum.

  The base 20 has a disc shape as a whole, and is integrally formed of a metal such as an aluminum alloy by die casting or the like. The base 20 is formed of a metal having excellent thermal conductivity, and also serves as a heat sink that radiates the heat of the light source. More specifically, the base 20 is in the form of a shallow dish with the disk-shaped front side forming the mounting surface 21 and the back side opening, and the leg portion 22 is provided at the center of the back side of the mounting surface 21.

  The leg portion 22 is formed in a shaft shape, its tip is hemispherical, and protrudes perpendicularly to the mounting surface 21 to the back side. The tip ends of the leg portions 22 project outward from the end edge of the peripheral wall 23 surrounding the back side of the mounting surface 21 (reference surface on the back side of the base 20) by the same height as the peripheral wall 23 in a side view. Further, a flange 24 that extends laterally is provided at the edge of the peripheral wall 23.

  On the back side of the base 20, ribs 25 that extend in four directions around the leg portion 22 and that are continuous with the inside of the peripheral wall 23 are radially provided. Each rib 25 not only reinforces the leg portion 22 and the peripheral wall 23 but also functions as a heat radiation fin. In FIG. 1, a peripheral wall 23 and a flange 24 are cut out in a section between two adjacent ribs 25 to provide a mounting space for arranging related parts such as a current circuit and a light source control circuit. . A positioning pin 24a protruding laterally is provided on one end side of the flange 24 facing the mounting space.

  Further, the base 20 is provided with an engaged portion 26 for snap-fit engagement with a cover 30 described later. The engaged portion 26 is arranged along the outer peripheral edge of the flange 24 at each position where the rib 25 is continuous. In the present embodiment, four engaged parts 26 are similarly arranged corresponding to the four ribs 25. As shown in detail in FIG. 10, the engaged portion 26 is provided on the outer peripheral edge of the flange 24 as an engaged groove with which the tip of an engaging claw that is an engaging portion 34 on the cover 30 side described later matches. ing.

  Next, the cover 30 has a hemispherical bowl shape as a whole, and is integrally formed of a synthetic resin such as plastic by a mold. By forming the cover 30 from an elastically deformable synthetic resin, it is possible to elastically deform an engaging portion 34 described later. At the top of the outer periphery of the cover 30, an irradiation opening 31 matching the irradiation range of the light source is provided in a cylindrical shape. As shown in FIG. 10, a step portion 32 is formed on the inner peripheral side of the opening 31 so as to reduce its diameter by one step toward the tip.

  The cover 30 is assembled so as to cover the front side of the base 20. That is, the opening edge 33, which is the outermost periphery of the cover 30, is combined with the outer peripheral edge of the flange 24 of the base 20, and the engaging portion 34 provided on one side is engaged with the engaged portion 34 provided on the other side. The parts 26 are fixed to each other by snap-fit engagement. Therefore, the inner diameter of the opening edge 33 of the cover 30 is designed to be closely matched to the outer diameter of the flange 24 of the base 20.

  The cover 30 is provided with an engagement portion 34 for snap-fit engagement with the base 20. A plurality of engaging portions 34 are arranged along the opening edge 33 so as to be aligned at a position that matches the engaged portion 26. In the present embodiment, four engaging portions 34 are similarly arranged corresponding to the four engaged portions 26. As shown in detail in FIG. 10, the engaging portion 34 is provided as an engaging claw that fits in the engaged groove that is the engaged portion 26 along the opening edge 33.

  As shown in FIG. 1, the engaging claw that is the engaging portion 34 has a shape in which the tip of the toe protrudes from the opening edge 33 toward the inner peripheral side. Here, the back side of the toe is tapered so as to elastically ride on the engaged groove which is the engaged portion 26. Further, a pair of slits are cut out on both sides of the engaging portion 34 so that a part of the outer periphery including the engaging portion 34 can be elastically deformed outward.

<Light source configuration>
Next, the light source arranged on the front side of the base 20 in the lamp body 11 will be described. The light source is one LED 41 which is a semiconductor light emitting element mounted on the LED substrate 40. The LED substrate 40 is formed in a quadrangle having a size that fits inside the mounting surface 21 of the base 20. As the LED 41, for example, a surface mount type LED chip is suitable. Since the LED chip is general, its detailed description is omitted, but it is of a type that emits light within an irradiation range of a predetermined angle around an optical axis orthogonal to the LED substrate 40. Although the emission color can be arbitrarily selected according to the use and type of the lamp, white is suitable for a reading lamp.

  The LED 41 needs to be held in a fixed position on the front side of the base 20 in the lamp body 11. Therefore, the mounting surface 21 of the base 20 is provided with positioning means for positioning the LED board 40 when the LED board 40 is placed. That is, as shown in FIG. 2, the mounting surface 21 is provided with three protrusions 27. On the other hand, around the LED substrate 40, a hole 42 into which the protrusions 27 are fitted and fitted is provided. In addition, the base 20 is also provided with an insertion hole 28 (see FIG. 2) through which a wiring for supplying power to the LED substrate 40 from an external power source is inserted.

  A ring-shaped packing 43 is interposed between the mounting surface 21 of the base 20 and the LED substrate 40, and they are in close contact with each other via the packing 43. The packing 43 is integrally formed of, for example, an elastic material such as non-conductive silicon rubber. The packing 43 is a member that protects a circuit on the LED substrate 40 as a cushioning material and enhances the adhesion between the base 20 and the LED substrate 40 to enhance the heat dissipation performance.

  A lens 50 is arranged in front of the LED 41. The lens 50 includes a lens body 51 that distributes the light incident from the LED 41 in a predetermined direction or range. In the present embodiment, the lens 50 is configured only by the lens body 51, but the lens 50 may include the lens body 51 as a part of the configuration. The lens body 51 is arranged in front of the LED 41 via the holder 53. Hereinafter, the lens 50 will be described in detail.

<Structure of lens 50>
As shown in FIGS. 11 to 18, the lens body 51, which is the lens 50 itself, has the illustrated solid bowl shape and is integrally formed of a transparent material such as acrylic or polycarbonate. The lens body 51 is provided in a concave shape at the top of the bottom, and has an incident surface 510 on which light from the LED 41 arranged to face the inside is incident, and a reflection surface 520 on which light reaching from the incident surface 510 is totally reflected inside the outer circumference. And an emission surface 530 through which light reaching the incidence surface 510 and the reflection surface 520 is emitted to the outside at the upper end facing the incidence surface 510.

  As shown in FIG. 18, in the lens body 51, the entrance surface 510 at the top of the bowl-shaped bottom has a first entrance surface 511 that forms a bottom surface with the optical axis L of the LED 41 as the center, and the first entrance surface 511. It is composed of a second incident surface 512 which forms a surrounding side surface. The first incident surface 511 is formed in a concentric shape centered on the optical axis L of the LED 41 and in a rounded cross section convex toward the LED 41 side. The first incident surface 511 makes the light from the LED 41 go straight or bent in the lens body 51 to pass inside the reflecting surface 520, and is directed to the inner region 531 near the center of the emitting surface 530.

  The second incident surface 512 is arranged so as to surround the emitting side of the LED 41, and the recess opening at the bottom apex is formed in a tapered cross-sectional shape slightly wider than the outer periphery of the first incident surface 511. The second incident surface 512 refracts the light from the LED 41 toward the reflecting surface 520, but excludes such light from the upper end side (upper side portion 522) of the reflecting surface 520, which continues from the emitting surface 530, described below. It is formed so that the light is distributed only in a predetermined range 521 near the top of the bottom. Such light distribution control is preset by the taper angle on the second incident surface 512.

  The reflection surface 520 is a critical reflection surface on the inside of the outer periphery of the lens body 51, which totally reflects the light incident from the second incident surface 512 toward the outer region 532 of the emission surface 530 which is closer to the outer side. is there. However, as described above, the light incident from the second incident surface 512 does not reach the entire area of the reflecting surface 520, but reaches the predetermined range 521 of the reflecting surface 520 near the top of the bottom in a limited manner. Here, the predetermined range 521 specifically corresponds to, for example, the reflecting surface 520 corresponding to the height position from the top of the bottom to 2/3 of the total height of the lens body 51.

  The reflecting surface 520 is formed of a series of inclined curved surfaces, but by the specific design of the curved shape and the inclination angle of the predetermined range 521, the totally reflected light is emitted from the emitting surface 530 in a desired direction and light distribution characteristics. can do. In the present embodiment, as shown in FIG. 18, the predetermined range 521 of the reflecting surface 520 is formed as an inclined curved surface that collects the reflected light in a direction substantially parallel to the optical axis L of the LED 41. Note that, in FIGS. 13, 15, and 18, the predetermined range 521 of the reflecting surface 520 and the upper portion 522 thereof are marked on only one of the left and right sides, but they are the parts around the entire circumference and are marked. The right and left opposite sides are also applicable.

  The emission surface 530 is formed in a concentric circular shape centering on the optical axis L of the LED 41 and having a curved cross-section that swells slightly, but the emission surface 530 is not limited to such a shape and may be a flat surface. In the light distribution control, the emission surface 530 is divided into an inner region 531 near the center and an outer region 532 around the inner region 531. However, such a division is not visibly divided. The inner region 531 is a region that directly emits the light incident from the first incident surface 511 to the outside. The outer region 532 is a region that emits the light that is incident from the second incident surface 512 and that is totally reflected in the predetermined range 521 of the reflecting surface 520 to the outside.

  As shown in FIGS. 2 and 10, the lens 50 is arranged in front of the LED 41 via the holder 53. The holder 53 is a member that holds the lens 50, is generally cylindrical, and has a flange 54 at the rear end opening, and is integrally formed of a synthetic resin such as plastic by a mold. The holder 53 is also positioned together with the LED board 40 by the positioning means described above. That is, as shown in FIG. 1, the flange 54 of the holder 53 is provided with a hole 55 into which the protrusions 27 on the base 20 are fitted and fitted.

  A step portion (attached portion) 52 that is positioned at the edge (attachment portion) of the front end opening of the holder 53 is provided outside the outer periphery of the lens body 51. Of the reflection surface 520 inside the outer periphery of the lens body 51, the lower portion located on the bottom apex side of the step portion 52 is the predetermined range 521. Strictly speaking, even the reflecting surface 520 cannot maintain total reflection in the portion where the step portion 52 is continuous.

  An upper portion 522 of the outer circumference of the lens body 51 including the step 52 is fitted in front of the inner circumference of the opening 31 of the cover 30 so that the upper surface of the step 52 is on the inner circumference of the opening 31. Engage with. Further, in the lens body 51, the lower surface of the step portion 52 is engaged with the edge of the front end opening of the holder 53. In this state, the lens body 51 is held between the holder 53 and the opening 31. The lens body 51 is not in contact with the holder 53 or the cover 30 except the step 52 and the outer periphery located above the step 52.

  Further, in the case where the mounting direction of the lens 50 with respect to the base 20 is predetermined, the lens 50 and the holder 53 may be provided with means 52a and 56 for restricting the mounting direction. That is, as shown in FIG. 1, a notch 52a is provided at one location in the step portion 52 of the lens 50. On the other hand, at the opening end of the holder 53, a protrusion 56 that matches the notch 52a is provided at one position where the notch 52a should be oriented.

  In a direction in which the protrusion 56 does not match the cutout 52a, the protrusion 56 interferes with the step portion 52 of the lens 50, so that the lens 50 cannot be combined with the holder 53. The lens 50 according to the present embodiment has the same shape over the entire circumference of the lens body 51 except for the step portion 52, and the orientation is not particularly specified, but regarding the lens 50A described below, the orientation of the lens 50A Can be easily determined, and assembly in the wrong direction can be prevented.

<Structure of another lens 50A>
19 to 25 show a lens 50A according to a modified example, which has a reflection surface 520A different from the reflection surface 520 in common with the lens 50 but having a basic shape and size. The same parts as those of the lens 50 are designated by the same reference numerals, and duplicate description will be omitted. The lens 50 </ b> A according to this modification is also arranged in front of the LED 41 via the same holder 53 and is held in the lamp body 11.

  The lens body 51A of the lens 50A is provided with a plurality of side surfaces 523 having a polygonal transverse cross section orthogonal to the axial center from the bottom top portion of the outer periphery to at least the middle of the predetermined range 521. Then, the light totally reflected by the reflection surface 520A inside each side surface 523 is configured to be emitted from the emission surface 530 to an irradiation range having the polygon as an outer contour.

  More specifically, the outer periphery of the lens body 51A is formed to have four side surfaces 523 that are inclined equiangularly in four directions from the bottom top (vertex) thereof. According to the reflecting surface 520 </ b> A on the inner side of each side surface 523, it is possible to collect the light reaching from the second incident surface 512 of the incident surface 510 into a quadrangle (square), and the exit surface 530. The light distribution from can be a quadrangle (square).

  In the present modification, the lens 50A is configured to have four side surfaces 523 that are equiangularly inclined in four directions from the top of the bottom of the outer periphery thereof. However, the specific configuration of the lens 50 is the present modification. The cross-sectional shape of the lens body 51 is not limited to the lens 50A according to the example, and may be, for example, a triangle, a pentagon or more.

<Overall structure of bracket 60>
The lamp body 11 forming the main part of the reading lamp 10 is attached to the seat 1 via the bracket 60. Here, the seat 1 is, for example, as shown in FIG. 34, a two-seater for a railway vehicle in which a seat portion 2 for two people and a backrest 3 are juxtaposed on the left and right, and an upper end side of each backrest 3 is provided. The reading lamp 10 is provided on the side of each of the two sides located outside the seat. The reading lamp 10 is attached to a frame inside the backrest 3 in a state where the opening 31 and the periphery thereof are exposed to the outside of the outer skin of the backrest 3.

  As shown in FIGS. 26 to 33, the bracket 60 holds the lamp body 11 in a displaceable manner, and includes a housing portion 61 for accommodating the lamp body 11 inside and a mounting portion for fixing the lamp body 11 to a frame inside the backrest 3. 66 and 67. The housing portion 61 has a substantially cylindrical shape that surrounds the entire lamp body 11 except for the opening 31 that is the irradiation surface of the lamp body 11, and is made of, for example, a metal material.

  The housing portion 61 includes a substantially cylindrical outer peripheral wall 62, a front wall 63 that covers the front opening of the outer peripheral wall 62, and a back wall 64 that surrounds the rear opening of the outer peripheral wall 62. The inner diameter of the outer peripheral wall 62 is set so that the lamp body 11 can be displaced. The front wall 63 is formed so that the outer periphery of the cover 30 slidably contacts the inside of the front wall 63, and a guide port 63a through which the opening 31 is movably inserted is provided.

  The guide opening 63a extends in the vertical direction, and the inner diameter and the lateral width of the upper and lower ends of the guide opening 63a are formed to be slightly larger than the outer diameter of the opening 31. Further, the peripheral edge of the guide port 63a may be configured as a separate part made of synthetic resin instead of metal. Further, a moquette or the like may be provided inside the peripheral edge of the guide opening 63a for elastically contacting the outer periphery of the cover 30. In addition, when the lamp body 11 is housed in the housing portion 61, the front wall 63 may be attached later.

  The back wall 64 surrounds the back side of the base 20 of the lamp body 11, but is not in the shape of a disc as a whole, but has a shape in which a plurality of support plates extend radially from the central portion. At the central portion of the back wall 64, a receiving portion 65 with which the tips of the legs 22 on the back side of the base 20 engage is provided. As shown in FIG. 29, the receiving portion 65 is formed by fitting a resin grommet into a place where a round hole is formed. However, the structure of the receiving portion 65 is not limited to this, and any other structure may be used as long as the tips of the leg portions 22 can engage with each other to form a fulcrum.

  The lighting body 11 housed in the housing portion 61 can adjust the irradiation direction of the LED 41 with the tip of the leg portion 22 engaged with the receiving portion 65 as a fulcrum. Here, the lamp body 11 can displace the orientation of the opening portion 31 in various directions such as vertical, horizontal, and diagonal directions with the tip of the leg portion 22 as the center of rotation, but in the present embodiment, the opening portion 31 extends vertically. You will be guided through the mouth 63a. Therefore, the displacement of the lamp body 11 is restricted by the vertical swing with the tip of the leg portion 22 as the center of rotation, and the irradiation direction of the LED 41 can be adjusted vertically.

  As described above, inside the housing portion 61, the outer periphery of the cover 30 of the lamp body 11 slidably contacts the inside of the front wall 63, and the outer peripheral wall 62 forms the outer periphery of the entire lamp body 11. Further, the tip of the leg portion 22 protruding from the base 20 of the lamp body 11 is engaged with the receiving portion 65 of the rear wall 64. In this way, the lamp body 11 is displaceably supported between the front wall 63 and the rear wall 64 of the bracket 60 with the tips of the legs 22 as fulcrums, and its posture is maintained by the frictional force in the supported state.

  In addition to the opening 31 of the lamp body 11 being guided in the guide opening 63a of the bracket 60, the positioning pin 24a of the base 20 is also provided with an elongated hole 66a (see FIG. 26) of a mounting portion 66 or the like to be described later. See). However, the guiding of the positioning pin 24a by the elongated hole 66a is not always necessary, and mainly serves to easily recognize the vertical position of the lamp body 11.

  The mounting portions 66 and 67 of the bracket 60 are for fixing to the frame inside the backrest 3, and are configured separately from the housing portion 61 and attached later. The mounting portions 66 and 67 are made of a metal material in various sizes and shapes according to the position and shape of the frame to be mounted inside the backrest 3. The number of mounting portions 66 and 67 is not limited to two. Although not the mounting portions 66 and 67, an eaves portion 68 is provided on the front wall 63 side of the housing portion 61 as an auxiliary structure. The eaves portion 68 is a portion for concealing a gap generated at an attachment location depending on the shape of the surface of the backrest 3 on which the reading light 10 is arranged.

<Characteristic action of reading light 10>
Next, the characteristic operation of the reading light 10 according to the present embodiment will be described.
As shown in FIG. 29, the leg portion 22 projects from the back side of the base 20 of the lamp body 11, and the tip end of the leg portion 22 engages with the receiving portion 65 in the housing portion 61. The lamp body 11 can swing in the housing portion 61 about the tip of the leg portion 22 as a fulcrum, and the irradiation direction of the LED 41 can be adjusted. According to such a lamp body 11, it is not necessary to make the entire shape into a spherical shape as in the prior art.

  As shown in FIG. 10, with respect to the base 20 of the lamp body 11, basically, a simple disk-like shape in which the LEDs 41 can be arranged on the front side is sufficient, and only the leg portions 22 are locally projected from the reference surface on the back side. It is enough if you do. Therefore, the lamp body 11 can be made into a compact shape that is not bulky, and the bracket 60 that supports the lamp body 11 can also be downsized. The interior space of the lamp body 11 is secured by the cover 30 combined with the front side of the base 20.

  As shown in FIG. 29, the front wall 63 of the bracket 60 is formed so that the outer periphery of the cover 30 slidably abuts on the inside thereof, and securely holds the cover 30 forming the front side of the lamp body 11. can do. An opening 31 for irradiation projects in a cylindrical shape at the top of the outer periphery of the cover 30, and the opening 31 is movably inserted through the guide port 63a in the vertical direction on the front wall 63.

  Therefore, the swing of the lamp body 11 is restricted in the vertical direction with the tip of the leg portion 22 as the center of rotation, and the irradiation direction of the LED 41 can be adjusted only in the vertical direction. The opening 31 of the lamp body 11 projects to the outside from the guide opening 63a of the front wall 63, and the opening 31 serves as an operating portion for moving the lamp body 11 by hand. Here, the tip end of the leg portion 22 that is the tilt center of the base 20 is the rotation center of the optical axis of the LED 41 as it is, so that the adjustment of the irradiation direction of the LED 41 is intuitively easy to understand.

  The base 20 is integrally formed of metal and also serves as a heat sink. This makes it possible to efficiently dissipate heat from the LED 41 and the LED substrate 40 that are heated by light emission, and suppress the temperature rise of the LED 41 and the LED substrate 40. The LED 41 arranged in the center of the front side of the base 20 and the leg portion 22 which particularly functions as a heat radiation fin on the back side of the base 20 are aligned with each other on the front and back sides of the base 20, and moreover, Since the plurality of ribs 25 are radially connected to the periphery, heat dissipation can be further enhanced.

<Assembly of reading light 10>
Next, assembly of the reading light 10 according to the present embodiment will be described.
In order to assemble the lamp body 11 which is the main part of the reading lamp 10, the LED substrate 40 is first arranged on the mounting surface 21 of the base 20, as shown in FIGS. The mounting surface 21 has a protrusion 27 as a positioning means. If the holes 42 of the LED board 40 are fitted to the protrusions 27, the LEDs 41 on the LED board 40 can be easily positioned. At this time, the packing 43 is interposed between the mounting surface 21 of the base 20 and the LED substrate 40.

  Subsequently, the holder 53 holding the lens 50 is arranged on the mounting surface 21 of the base 20 so as to be superposed on the LED substrate 40. Since the holder 53 also has the hole 55 into which each protrusion 27 is fitted, the holder 53 and the lens 50 can be easily positioned. At this time, it is not necessary to bond the holder 53 to the LED substrate 40 or the lens 50 to the holder 53.

  Finally, the cover 30 is assembled so as to cover the base 20 from above the holder 53 of the lens 50. Here, the opening edge 33 of the cover 30 is matched with the outer peripheral edge of the flange 24 of the base 20, but the engaging portion 34 of the cover 30 snap-engages with the engaged portion 26 of the base 20 so that they are mutually engaged. Fixed. Therefore, when assembling the lamp body 11, it is not necessary to use a fixing means such as an adhesive or a screw, and it is possible to easily combine the lamp body 11 with only the respective structures of the base 20 and the cover 30.

  Regarding the snap-fit engagement in detail, as shown in FIG. 10, the engaging claw that is the engaging portion 34 of the cover 30 is elastically deformed so that the tip of the engaging claw rides on the outer peripheral edge of the flange 24 of the base 20. Expand. Then, when the toe of the engaging portion 34 reaches the engaged groove which is the engaged portion 26, the engaging pawl is fitted into the engaged groove while returning to the original state, thereby snap-fit engagement. To do.

  In this way, simply by the operation of fitting the cover 30 on the base 20, the snap fit is naturally performed along with the above operation without performing extra work such as separately deforming the engaging portion 34 with a tool or the like. Engagement is also completed. Moreover, in the lens 50 in the holder 53, the upper portion of the outer periphery of the step portion 52 is fitted to the inner circumference of the opening 31 of the cover 30, and the upper surface of the step portion 52 is the step of the inner circumference of the opening portion 31. Engage with section 32. In this state, the lens body 51 is held between the holder 53 and the opening 31.

  In the combined lamp body 11, not only the lens 50 and the holder 53, but also the LED substrate 40 and the packing 43 are held in a state of being engaged with each other and positioned. Thus, by simply combining the base 20 and the cover 30, the components inside thereof can be fixed by the pressing forces that engage with each other at their respective fixed positions. Further, the emission surface 530 of the lens 50 matches the opening 31 and closes it, and it is not necessary to separately prepare a transparent protective cover or the like for covering the opening 31.

<Use of reading light 10>
The reading lamp 10 is completed by housing the lamp body 11 assembled as described above in the housing portion 61 of the bracket 60 as described above. In this way, the lamp 11 together with the bracket 60 is treated as one unit of the reading lamp 10. Then, the reading light 10 is fixed to the frame in the backrest 3 of the seat 1 via the mounting portions 66 and 67 of the bracket 60, so that the reading light 10 is used by a seated person.

  When the reading light 10 is used, the LED 41, which is a light source, is turned on by a switch (not shown). Then, in order to adjust the irradiation direction of the LED 41, a finger is put on the opening 31 protruding to the outside of the housing portion 61, and the operating force is superior to the above-mentioned frictional force for holding the lamp body 11 in a stationary state. Just press it. At this time, since the lamp body 11 swings vertically with the tip of the leg portion 22 of the base 20 as the center of rotation, when the lamp body 11 swings in the desired irradiation direction, by releasing the hand from the opening portion 31, Can be stopped in position.

<Light distribution control of lenses 50 and 50A>
Next, among the constituent parts of the reading light 10, particularly characteristic optical characteristics of the lens 50 will be described. As shown in FIG. 18, according to the present lens 50, the lens body 51 distributes the light incident from the LED 41 in a predetermined direction or range. The light from the LED 41 is efficiently taken into the inside of the lens body 51 from the incident surface 510 provided in the top of the bottom of the lens body 51. Here, the light from the LED 41 goes straight or bends depending on the angle with respect to the incident surface 510 and passes through the inside of the lens body 51.

  More specifically, the incident surface 510 includes a first incident surface 511 that forms the bottom surface of the concave portion and a second incident surface 512 that forms the side surface of the concave portion, and have different light distribution characteristics. Thereby, the light from the LED 41 can be efficiently used. The light incident from the first incident surface 511 goes straight or bends so as to pass inside the reflecting surface 520 in the lens body 51, and is emitted to the outside from the inner region 531 of the emitting surface 530.

  Further, the light incident from the second incident surface 512 goes straight or bends toward a predetermined range 521 near the top of the bottom of the reflecting surface 520 in the lens body 51. Then, the light totally reflected by the predetermined range 521 of the reflecting surface 520 is condensed in a direction substantially parallel to the optical axis L of the LED 41 and emitted from the outer region 532 of the emitting surface 530 to the outside.

  As described above, the second incident surface 512 refracts the light from the LED 41 toward the reflective surface 520, but distributes the light not in the entire area of the reflective surface 520 but in a predetermined range 521 near the bottom top. According to such light distribution control, even if the passenger views the exit surface 530 that blocks the opening 31 from an oblique direction, unless the passenger deliberately looks deep into the front surface, the predetermined position on the innermost side of the reflective surface 520 is determined. The range 521 cannot be seen. Therefore, of the total reflection surface 520 of the lens body 51, only the upper portion 522 that does not reflect light can be in the normal field of view, and unpleasant glare can be suppressed.

  By the way, the irradiation range of the light from the reading light 10 may be a quadrangle that matches the shape of the magazine or seat table read by the seated person, but in the conventional reading light, a circular light distribution covering the quadrangle is used. . In the case of such a circular light distribution, the light distribution in the arcuate portion between the chords and the arc becomes extra on the outside of each side of the quadrangle inscribed in the circle.

  Such an extra light distribution has a problem in that, especially in the reading light 10 applied to the seat 1 for a railway vehicle, the light is directed to the passage in the side of the seat 1 or the passenger in the front seat. Therefore, as described above, the light from the LED 41 is efficiently used without being wasted, by arranging the irradiation range from the original to a quadrangle by devising the lens 50A itself, instead of blocking extra light. be able to.

  More specifically, the outer circumference of the lens body 51A has four side surfaces 523 that are equiangularly inclined in four directions from the top (top) of the bottom. According to the reflection surface 520 </ b> A inside each side surface 523, it is possible to condense the light reaching from the second incidence surface 512 of the incidence surface 510 into a quadrangle (square), and the emission surface 530. Can realize a square (square) light distribution.

  Although the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, Included in the invention. For example, the seat 1 in which the reading light 10 is provided is not limited to the railcar, and may be a seat for other vehicles such as an aircraft and a ship. Further, instead of being provided directly on the seat 1, it may be provided on a ceiling, a side wall, or the like in the vicinity so as to correspond to the seat 1.

  Further, the specific shapes of the lamp body 11, the bracket 60, and the like that compose the reading lamp 10 are not limited to the illustrated ones. Further, the LED 41 included in the lamp body 11 and the substrate 40 thereof may have various shapes. Further, the adjustment of the irradiation direction of the light source is not limited to the vertical direction, but may be adjusted to the horizontal direction as needed, or may be configured to be adjustable in the entire circumferential direction of 360 degrees.

  Further, in the lamp body 11, the cover 30 is provided with the engaging portion 34 and the base 20 is provided with the engaged portion 26. However, as an opposite aspect, the cover 30 is provided with the engaged portion 26 and the base 20 is provided with the engaged portion 26. The engagement portion 34 may be provided. Here, the engaging portion 34 is not limited to the claw-shaped one, and the engaged portion 26 is not limited to the groove-shaped one into which the claw is fitted.

  Further, among the characteristic parts of the reading lamp 10, particularly the characteristic lenses 50 and 50A, in addition to the overall shape thereof, the entrance surface 510, the reflection surfaces 520 and 520A and the predetermined range 521 thereof, and the exit surface 530 are specifically described. The shapes and configurations are not limited to those shown in the drawings, and can be changed as appropriate. Further, the lenses 50 and 50A can be used as optical components of not only the reading lamp 10 but also various other lighting devices.

  INDUSTRIAL APPLICABILITY The present invention can be widely used as a reading light for seats of vehicles such as railway cars, aircrafts, automobiles, and ships.

DESCRIPTION OF SYMBOLS 1 ... Seat 2 ... Seat 3 ... Backrest 10 ... Reading light 11 ... Lamp 20 ... Base 21 ... Mounting surface 22 ... Leg 26 ... Engagement 30 ... Cover 31 ... Opening 32 ... Step 33 ... Opening Edge 34 ... Engaging portion 40 ... LED substrate 41 ... LED
50, 50A ... Lenses 51, 51A ... Lens body 510 ... Incident surface 511 ... First incident surface 512 ... Second incident surface 520, 520A ... Reflective surface 521 ... Predetermined range 522 ... Upper part 523 ... Side surface 530 ... Emission surface 531 ... Inner area 532 ... Outer area 52 ... Step section 53 ... Holder 60 ... Bracket 61 ... Housing section 62 ... Outer peripheral wall 63 ... Front wall 64 ... Back wall 65 ... Receiving section 66, 67 ... Mounting section

Claims (8)

In a reading light including a light body including a light source, the light body being attached to a seat through a bracket,
The lamp body has a leg portion projecting to the side opposite to the emission side of the light source and having a tip end engaged with a receiving portion in the bracket,
A reading lamp, wherein the lamp body is supported by the bracket so that the irradiation direction of the light source can be adjusted with the tip of the leg as a fulcrum. The lamp body is a combination of a base for arranging the light source on the front side, and a cover surrounding the light source excluding its irradiation range in front of the front side of the base,
The reading lamp according to claim 1, wherein the leg portion is protruded along the extension line of the optical axis of the light source on the back side of the base.   The reading light according to claim 2, wherein the base is integrally formed of metal and also functions as a heat sink. The base is a disk shape, while the light source is arranged at the center of the front side, the leg portion is provided at the center of the back side,
The cover has a hemispherical bowl shape, and an irradiation opening is provided at the top of the outer periphery so as to project in a cylindrical shape.
The front side of the bracket is formed so that the outer periphery of the cover slidably contacts the inside thereof, and a guide port through which the opening is movably inserted is provided.
The reading lamp according to claim 2 or 3, wherein a rear side of the bracket is formed so as to surround a back side of the base, and the receiving portion is provided.   The base and the cover are combined in such a manner that an opening edge of the cover is fitted to an outer peripheral edge of the base, and an engaging portion provided on one side is snap-fitted to an engaged portion provided on the other side. The reading light according to claim 2, 3 or 4, wherein the reading lights are fixed to each other by combining. The light source is one LED mounted on a substrate,
The reading lamp according to claim 2, 3, 4, or 5, characterized in that a positioning means for positioning the substrate is provided on the front side of the base. In front of the light source, a lens that distributes light incident from the light source in a predetermined direction or range is arranged via a holder that holds the lens,
The reading lamp according to claim 6, wherein the holder is positioned with the substrate by the positioning means.   8. The substrate, the lens, and the holder are held in a state of being engaged with each other and positioned in the lamp body by fixing the base and the cover. Reading light.

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