阅读说明：本技术 车内照明灯 (Vehicle interior lighting lamp ) 是由 池田贵之 铃木健 佐佐木具明 马场健一 于 2018-12-21 设计创作，主要内容包括：一种车内照明灯(1)包括：壳体(10),其能够装接至车辆的车内顶板(2)并且具有开口(13)；车室灯透镜(21),其布置在开口(13)处；隔室(17),其设置在壳体(10)中并且围绕开口(13)；发光二极管(31),其布置在隔室(17)的角部中并且朝着车室灯透镜(21)发光；以及反射器(15),其布置在隔室(17)的内部。车室灯透镜(21)的厚度随着远离发光二极管(31)而减小。突起(21g)设置在车室灯透镜(21)上。(A vehicle interior lighting lamp (1) includes: a housing (10) attachable to an interior roof panel (2) of a vehicle and having an opening (13); a vehicle room lamp lens (21) disposed at the opening (13); a compartment (17) provided in the housing (10) and surrounding the opening (13); a light emitting diode (31) disposed in a corner of the compartment (17) and emitting light toward the vehicle room lamp lens (21); and a reflector (15) arranged inside the compartment (17). The thickness of the room lamp lens (21) decreases with distance from the light emitting diode (31). The projection (21g) is provided on the vehicle room lamp lens (21).)

1. A vehicle interior lighting lamp comprising:

a housing that is attachable to a roof panel of a vehicle and has an opening;

a lens disposed at the opening;

a compartment provided in the housing and surrounding the opening in which the lens is disposed;

a light source disposed in a corner of the compartment and emitting light toward the lens; and

a reflector disposed inside the compartment, wherein,

the thickness of the lens decreases with increasing distance from the light source, and

the lens is provided with protrusions or serrations.

2. The vehicle interior lighting lamp according to claim 1,

a plurality of steps are provided on a surface of the lens facing the light source, and a thickness of the steps decreases as a distance from the light source increases.

3. The vehicle interior lighting lamp according to claim 2,

the protrusions or the serrations are provided along boundaries between adjacent steps of the plurality of steps.

Technical Field

The present invention relates to an interior lighting lamp attached to an interior roof panel of a vehicle.

Background

Various interior lighting lamps of this type have been proposed previously (see patent document 1 and patent document 2). One example of an existing interior light includes: a housing attached to an inside roof panel of a vehicle; a switch button disposed at a lower side of the housing; a lens disposed at a lower side of the housing; and a light source, such as a light emitting diode, disposed inside the housing.

The interior lamp illuminates the interior of the vehicle by light projected from the light source and emitted through the lens. When the lens is a room light lens, it is desirable to have the light exit from the entire area of the lens as uniformly as possible. Therefore, in the existing interior lighting lamp, a plurality of light sources are arranged, or a light guide plate is integrally arranged inside a vehicle room lamp lens.

Reference list

Patent document

Patent document 1: JP 2016-221984A

Patent document 2: JP 2002 + 002375A

Disclosure of Invention

The existing interior lighting lamp uses a plurality of light sources or a light guide plate integrally arranged inside a vehicle room lamp lens to emit light from the entire area of the vehicle room lamp lens as uniformly as possible. However, in this case, the light exit surface of such a room lamp lens has a monotonous appearance, but there is a demand for decorative lighting.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an interior lighting lamp capable of improving the designability of a light exit surface of a room lamp lens by emphasizing a convex portion or a serration on the room lamp lens at the time of light exit.

An interior light according to an aspect of the present invention includes: a housing that is attachable to a roof panel of a vehicle and has an opening; a lens disposed at the opening; a compartment disposed in the housing and surrounding the opening; a light source disposed in a corner of the compartment and emitting light toward the lens; and a reflector disposed inside the compartment. The thickness of the lens decreases with increasing distance from the light source. The lens is provided with protrusions or serrations.

The interior lighting lamp according to one aspect of the present invention can improve the design of the light emitting surface of the lens by the protrusions or the serrations provided on the lens, which are emphasized when light is emitted from the lens.

Drawings

Fig. 1 shows an interior lighting lamp according to an embodiment viewed from the interior of a vehicle when looking up at an interior roof panel.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a sectional view taken along the line B-B in fig. 1.

Fig. 4 is a perspective view of a reflector of the interior lighting lamp according to the embodiment when viewed from the surface side.

Fig. 5 is a perspective view of a reflector of the interior lighting lamp according to the embodiment when viewed from the back surface side.

Detailed Description

An embodiment will be described below with reference to the drawings.

Fig. 1 to 5 illustrate the embodiment. A map lamp 1 as an interior lighting lamp according to the embodiment is attached to a point on the roof panel 2 that is further forward than the front seat of the vehicle.

The map lamp 1 includes: a housing 10 attached to the roof panel 2; a pair of left and right spotlight lenses 20 and a pair of left and right room lamp lenses 21 disposed at a lower side of the housing 10; a plurality of switch buttons 25 disposed at a lower side of the case 10; and a substrate 30 disposed inside the case 10.

The case 10 is made of a material that does not transmit light (e.g., opaque synthetic resin). The housing 10 includes a housing main body 11 and a roof side housing portion 12, the roof side housing portion 12 being assembled to the housing main body 11 and covering the roof side of the housing main body 11. The housing main body 11 is provided with a plurality of light-shielding partition walls 11 a. A plurality of first openings 13 and a plurality of second openings 14 that open compartments defined by the plurality of light-shielding partition walls 11a are formed on the lower side of the housing main body 11.

The roof side housing portion 12 is provided with a mounting portion (not shown) for mounting to the roof panel 2.

The spotlight lens 20 and the room lamp lens 21 are arranged to close the first opening portion 13. Each of the spotlight lenses 20 has a circular shape with a small surface area exposed to the inside of the vehicle. Each room lamp lens 21 has a square shape with a large surface area exposed to the vehicle interior.

Each room lamp lens 21 is made of synthetic resin and is opaque white in color, and has a curved light emitting surface (surface side) 21a of a predetermined curvature. As shown in fig. 3, each of the room lamp lenses 21 is formed with a plurality of (four in the embodiment) step portions 21c, 21d, 21e, 21f on a light receiving side (back side) 21b which is a side facing the light source, and the plurality of step portions 21c, 21d, 21e, 21f are gradually reduced in thickness along a direction X perpendicular to a longitudinal direction Y of the lens 21, the thickness being reduced as a distance from the three-color light emitting diode (light source) 31 increases. The projection 21g is formed along a boundary extending in the longitudinal direction Y of the lens 21 between adjacent ones of these steps 21c, 21d, 21e, 21 f. That is, the back surface side 21b is formed to gradually change in shape (in a stepwise manner) in which the plurality of step portions 21c, 21d, 21e, 21f are reduced in thickness corresponding to the distances from the three-color light emitting diodes 31, respectively.

Each switch button 25 is arranged to close the corresponding second opening 14 on the lower side of the housing main body 11. Each switch button 25 is a push switch button. Each switch knob 25 is made of a material that does not transmit light except for the symbol mark portion 25 d. Each of the switch buttons 25 includes: an operation portion 25a exposed on the front surface side of the housing main body 11; a switch push rod (not shown) protruding into the housing main body 11; and a light shielding wall (not shown) protruding into the housing main body 11.

Each operation portion 25a is provided with a symbol mark portion 25d made of a light-transmitting material. The symbol mark portion 25d has a mark for visually recognizing the function of the corresponding switch button 25. One switch knob 25 includes an indicator lens 25e on the operation portion 25a in addition to the symbol mark portion 25 d.

The substrate 30 abuts on the upper side of the light-shielding partition wall 11a of the housing main body 11. The substrate 30 closes a plurality of opening portions formed by the light-shielding partition walls 11a partitioning the housing on the ceiling side (see fig. 3). That is, the illumination light from the three-color light emitting diodes 31 is prevented from leaking to the roof side case portion 12. A plurality of three-color light emitting diodes (light sources) 31 and a plurality of switching devices SW and the like are mounted on the substrate 30. The respective three-color light emitting diodes 31 are arranged in the respective areas partitioned by the light-shielding partition wall 11a in correspondence with the respective spotlight lenses 20, room lamp lenses 21, and switch buttons 25, respectively. For the switch knob 25 having the indicator lens 25e, the three-color light emitting diode 31 is disposed in the region corresponding to the indicator lens 25e in addition to the region corresponding to the symbol mark portion 25 d.

Each of the three-color light emitting diodes 31 includes a red (R) light emitting element, a green (G) light emitting element, and a blue (B) light emitting element, and emits light of a predetermined color in accordance with, for example, a current value.

Each switch device SW is disposed directly below a switch pusher (not shown) of the corresponding switch button 25.

Next, a portion where light exits from the vehicle room lamp lens 21 will be described.

As shown in fig. 2 and 3, the housing 10 is formed with a compartment 17 therein, which surrounds the first opening 13 in which the room lamp lens 21 is disposed. Three-color light emitting diodes 31 are disposed in the corners of the compartment 17. In the compartment 17, a box-shaped reflector 15 is disposed, the box-shaped reflector 15 having a reflective surface that reflects light from the three-color light emitting diode 31. The reflector 15 has a shape as shown in fig. 4 and 5. The surface of the reflector 15 is covered with white having high reflectivity or is covered with aluminum vapor deposition for reflection. The reflector 15 is arranged to extend along all inner surfaces of the compartment 17. More specifically, the reflector 15 includes: a flat surface portion 15a arranged along the top surface of the compartment 17; an inclined portion 15b located on the roof side of the compartment 17; and a side face portion 15c disposed along all sides of the compartment 17. The flat surface portion 15a is parallel to the surface of the room lamp lens 21 and is located in a region near the three-color light emitting diode 31 in the top surface. The inclined portion 15b is inclined with respect to the room lamp lens 21 (the inclined portion 15b is inclined toward the three-color light emitting diode 31), and is located in a region away from the three-color light emitting diode 31 in the top surface.

As shown in fig. 4 and 5, the reflector 15 is provided with: a surrounding rib 15d located at the center of the inner side of the inclined portion 15 b; and a foreign matter prevention rib 15e along an upper edge of the back surface side of the side surface part 15 c. The foreign matter prevention rib 15e prevents foreign matter such as dust from entering the case 10. The surrounding rib 15d captures foreign matter such as dust falling on the slope of the inclined portion 15b and prevents the foreign matter from falling downward.

As described above, the map lamp 1 includes: a housing 10 attached to a roof panel 2 in a vehicle and having a first opening portion 13; a vehicle room lamp lens 21 disposed at the first opening portion 13; a compartment 17 provided in the housing 10 and surrounding the first opening portion 13; a three-color light emitting diode 31 arranged in a corner of the compartment 17 and emitting light toward the vehicle room lamp lens 21; and a reflector 15 arranged at an inner surface of the compartment 17. A plurality of step portions 21c, 21d, 21e, 21f, the thickness of which decreases as the distance from the three-color light emitting diode 31 increases, are provided on the rear surface side 21b of the room lamp lens 21. The protrusions 21g are provided along the boundaries between adjacent ones of the steps 21c, 21d, 21e, 21 f.

Therefore, a part of the light emitted from the three-color light emitting diodes 31 is directly projected and transmitted through the room lamp lens 21 having different thicknesses, and the other part of the emitted light is reflected once on the side surface portion 15c or the inclined portion 15b of the reflector 15 or is reflected multiple times (scattered) before being projected to the room lamp lens 21. Thereby, the three-color light emitting diodes 31 can emit light as uniformly as possible from the entire region of the room lamp lens 21. That is, the map lamp 1 can uniformly emit light from the entire area of the lens similarly to the existing corresponding device without increasing the amount of emitted light by using a plurality of light sources or without using a light guide plate.

The reflector 15 in the map lamp 1 has: a flat surface portion 15a parallel to the surface of the room lamp lens 21 in a region close to the three-color light emitting diode 31 in the top surface; and an inclined portion 15b inclined with respect to the surface of the room lamp lens 21 in a region of the top surface away from the three-color light emitting diode 31 (the inclined portion 15b is inclined toward the three-color light emitting diode 31).

Therefore, in the map lamp 1, the region of the room lamp lens 21 away from the three-color light emitting diode 31 is irradiated with the light reflected from the inclined portion 15 b. The inclined portion 15b contributes to uniform light emission from the entire area of the room lamp lens 21.

The light emitted from the three-color light emitting diode 31 is bright at the front surface, and the brightness decreases as the distance from the front surface increases. As the thickness of the room lamp lens 21 increases, the luminance also decreases since less light energy is transmitted, and conversely as the thickness of the lens decreases, the luminance also increases. This is why the plurality of steps 21c, 21d, 21e, 21f are provided to the map lamp 1 such that the thickness on the back face side 21b of the room lamp lens 21 is thicker at the front of the three-color light emitting diode 31 and is thinner as the distance from the front increases. These steps 21c, 21d, 21e, 21f are formed such that the shape of the back side 21b changes in a stepwise manner, with the thickness decreasing corresponding to the distance from the three-color light emitting diode 31. This feature of the map lamp 1 makes the luminance (brightness) of the light emitting surface 21a of each step portion 21c, 21d, 21e, 21f of the room lamp lens 21 uniform. Further, in the map lamp 1, the protrusion 21g is provided along the boundary between each adjacent pair of the steps 21c, 21d, 21e, 21 f. The light that is projected on the reflector 15 and reflected by the reflector 15 is scattered by the protrusion 21g at the boundary where the thickness of the room lamp lens 21 is changed, so that the light is enhanced. This feature of the map lamp 1 improves the appearance of the light emitting surface (obverse side) 21a of the room lamp lens 21, and therefore the design (decorative feature) of the light emitting surface (obverse side) 21a of the room lamp lens 21 can be improved.

In the map lamp 1, the reflector 15 is arranged to extend over the entire inner surface of the compartment 17. Therefore, in the map lamp 1, light is reflected at an arbitrary position on the inner surface of the projection compartment 17 thereof, so that light emitted from the three-color light emitting diode 31 is projected to the vehicle room lamp lens 21 with high efficiency, which enables the vehicle room lamp lens 21 to emit bright light.

Further, the reflector 15 includes a surrounding rib 15d at the center of the back surface side of the inclined portion 15b and a foreign-substance-preventing rib 15e along the upper edge of the back surface side of the side surface portion 15 c. Therefore, foreign matter such as dust is prevented from entering the inside 21b of the room lamp lens 21. That is, an insertion hole or the like for a vehicle side connector (not shown) to be connected to the connector 32 on the substrate 30 is opened in the roof side case 12. Foreign matter such as dust may originally enter the housing 10 through such an opening, but the foreign matter prevention rib 15e prevents any foreign matter such as dust from entering the housing 10, and even if foreign matter such as dust enters the housing 10, the surrounding rib 15d catches the foreign matter and prevents it from falling downward.

The map lamp 1 as the interior lighting lamp according to the embodiment is provided with the protrusion 21g along the boundary between the adjacent steps among the plurality of steps 21c, 21d, 21e, 21f formed on the light receiving side (back side) 21b of the room lamp lens 21 as the side facing the light source 31 for improving the design of the light emitting surface (front side) 21a of the room lamp lens 21 at the time of light emission. Alternatively, serrations (not shown) or protrusions and serrations (not shown) may be provided instead of the protrusions 21g to improve the design of the light emitting surface (front surface side) 21a of the room lamp lens 21 at the time of light emission. The projection 21g also functions to improve the rigidity of the vehicle room lamp lens 21.