JP7302944B2 - multiple image drawing device - Google Patents

Description

The present invention relates to an apparatus for drawing multiple images on a road surface, a wall surface, or the like using a plurality of lamp units.

Devices are known that have a plurality of lamp units inside a lamp casing. For example, in Patent Document 1, a plurality of lamp units are arranged inside a lamp casing, each lamp unit emits spot light composed of diffused light, and the plurality of spot lights are superimposed to form a reading lamp in the passenger compartment. An apparatus for forming a light distribution pattern is described. Patent Document 2 discloses a device that draws a multiple image on the road surface in front of the vehicle by providing MEMS mirrors in drawing units built into left and right headlamps, respectively, and superimposing light distribution patterns generated by each mirror. Are listed.

Japanese Patent Application Laid-Open No. 2000-188002 JP 2017-107690 A

However, according to the conventional device disclosed in Patent Document 1, spot lights composed of diffused light are superimposed, so that not only does the outline of the light distribution pattern become unclear, but also the shape of the light distribution pattern is limited to a circular shape. It was not possible to draw complicated shapes such as characters. In addition, according to the conventional device of Patent Document 2, although it is possible to draw a complex multiplexed image using MEMS mirrors, it is necessary to use expensive optical components, and the control for drawing is complicated. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus capable of drawing a multiple image brightly and clearly on a road surface or a wall surface using inexpensive optical components.

In order to solve the above problems, the drawing apparatus of the present invention includes a plurality of lamp units inside a lamp casing, each lamp unit having a light source that generates visible light and a first lens ( a condensing lens), a shade for forming an image of a desired shape on the light emitted from the first lens, and a second lens (projection lens) for projecting the formed image in front of the lamp. A plurality of images are superimposed at substantially the same position to draw a multiple image in front of the lamp.

In a preferred embodiment of the present invention, the first lens, the shade and the second lens are arranged at the same position on the optical axis of the lamp units in order to superimpose the multiple images exactly at the same position in front of the lamp. be done. Also, the plurality of lamp units can be arranged so that their optical axes are parallel to each other, and an appropriate diffusion angle can be set for each second lens so that the plurality of images match at a desired distance. Alternatively, multiple lamp units can be arranged obliquely to each other so that the optical axes intersect in front of the lamps. The optical axis of the lamp unit is a straight line that coincides with the axis of rotational symmetry of the total luminous flux passing through the optical system of the unit. means a straight line of coincidence.

In each lamp unit, it is desirable to integrate each component with a common member, reduce the number of optical parts, and reduce assembly errors. For example, a plurality of first lenses can be integrally molded on a common first lens base for each lamp unit. In this case, it is preferable to form a regulation wall on the first lens base for regulating mutual interference of light emitted from adjacent first lenses. Similarly, a plurality of second lenses can be integrally formed on a second lamp base common to each lamp unit.

In some embodiments of the invention, the shade comprises a translucent portion formed on a light blocking plate common to a plurality of lamp units. An example of the translucent portion is an opening or a transparent portion that forms an image of a predetermined shape with light emitted from the first lens. In this case, if a light-shielding plate having a large thickness is used, the edge portion of the image projected from the second lens tends to become unclear. For this reason, it is preferable to use a thin plate made of a transparent resin as the light shielding plate, and cover the surface of the thin plate with an opaque film except for the light transmitting portion.

According to the drawing apparatus of the present invention, since a plurality of lamp units are configured to superimpose the images formed by the shades at the same position to draw a multiple image in front of the lamp, inexpensive optical components can be used. It has the excellent effect of being able to draw a multiple image brightly and clearly on a road surface or a wall surface.

1 is a side view of a forklift showing an embodiment according to the present invention; FIG. 1 is a perspective view showing a drawing device mounted on a forklift; FIG. 1 is a perspective view showing an exploded drawing device; FIG. FIG. 3 is a perspective view showing a light source, a condenser lens and a shade; 1 is a horizontal sectional view of a drawing device; FIG. FIG. 6 is a vertical cross-sectional view of the drawing device taken along line XX of FIG. 5; It is process drawing which shows the manufacturing method of a shade. FIG. 10 is an operation explanatory diagram of the drawing device; It is a perspective view which shows the example of a change of this invention.

An embodiment of the present invention will be described below with reference to the drawings. A drawing device 11 shown in FIG. A multiple image G is drawn on the road surface R in front to inform the approach of the forklift 1 . Note that the drawing device 11 is not limited to the forklift 1, and can be used as lighting fixtures for vehicles such as civil engineering and construction vehicles, buses, passenger cars, and railway vehicles, lighting fixtures for aircraft and ships, and various lighting fixtures such as road lights and advertising lights. can also

As shown in FIGS. 2 and 3, the lamp casing 12 is made of a lightweight metal material such as aluminum and has a box shape. Bezel members 16 and 17 are attached to both front and rear ends of the casing 12, and a pair of front and rear packings 18 and 19, a heat dissipation sheet 20, a light source substrate 21, a first lens base 22, a light shielding plate 23, and a second lens are mounted inside the casing 12. A base 24 is housed. A power supply cable 25 is pulled out from the light source substrate 21 through the rear bezel member 16 to the rear of the lamp, and the lens portion of the second lens base 24 is exposed from the front bezel member 17 to the front of the lamp.

As shown in FIGS. 3 and 4, the light source substrate 21 is provided with three LED light sources 27 for generating visible light arranged side by side. On the rear surface of the first lens base 22, there are three left and right condensing lenses 28 (partially shown in FIG. 4, see FIG. 5 for details) as first lenses for separately collecting light from the LED light source 27. A pair of left and right restricting walls 29 are formed integrally on the front surface of the first lens base 22 to restrict mutual interference of light emitted from adjacent condenser lenses 28 . A boss portion 30 and a small protrusion 31 are provided on the regulation wall 29 , and a through hole 33 through which an assembly bolt 32 passes is formed in the boss portion 30 . As a means for regulating the mutual interference of light, a surface treatment layer such as coating or vapor deposition may be provided on the surface of the regulation wall 29, a light beam control means such as texture or a diffusion step may be provided, or a transparent resin material and an opaque resin material may be used. The regulation wall 29 can be formed by multicolor molding.

The light shielding plate 23 is made of a thin plate made of transparent resin having a U-shaped end face, and this thin plate has a small hole 36 into which the small projection 31 of the regulation wall 29 is fitted, an insertion hole 37 through which the assembly bolt 32 is inserted, and a light condensing plate. Three shades 38 are formed for forming the light emitted from the lens 28 into an image of a desired shape. Each shade 38 is a light-transmitting portion that is opened by cutting out three portions in front of the condenser lens 28 in a desired shape. ) is covered by an opaque film 39 . The shade 38 shown in FIG. 4 is cut out in the shape of an arrow indicating the traveling direction of the forklift 1 .

The shade 38 can be formed on the light shielding plate 23 by a method other than cutting. For example, as shown in FIG. 7, a base material (thin plate made of transparent resin) of the light shielding plate 23 is prepared, figures and characters are masked on the surface of the base material, and an opaque film 39 is deposited on the surface of the base material by vapor deposition. After that, the mask is removed and the shade 38 is formed. Alternatively, the shade 38 is formed by forming an opaque film 39 over the entire surface of the substrate by vapor deposition or plating, and partially peeling off the opaque film 39 by laser processing or the like. The shade 38 produced by these methods is not an opening but a light-transmitting portion of the substrate itself, and the surface of the thin plate excluding the light-transmitting portion is covered with an opaque film 39 .

As shown in FIGS. 4 and 5, the assembly bolt 32 is inserted through the insertion hole 37 of the light shielding plate 23, the through hole 33 of the first lens base 22, the hole 41 of the light source substrate 21, and the hole 42 of the heat dissipation sheet 20 (see FIG. 3). ) and screwed into the screw holes 43 of the rear bezel member 16, and the rear bezel member 16 is assembled to the rear end corner of the lamp casing 12 via the rear packing 18 with screws 44 (see FIG. 3). ing. Thereby, the heat dissipation sheet 20 , the light source substrate 21 , the first lens base 22 and the light shielding plate 23 are fixedly held by the lamp casing 12 via the rear bezel member 16 and the rear packing 18 .

On the other hand, as shown in FIGS. 5 and 6, the second lens base 24 is sandwiched between the front bezel member 17 and the lamp casing 12 via the front packing 19 at the peripheral edge, so that the front bezel member 17 is , and screws 45 (see FIG. 3). The second lens base 24 exposed from the front bezel member 17 is integrally formed with three projection lenses 48 as second lenses for separately projecting images formed by the shade 38 forward of the lamp. Each projection lens 48 is a convex lens with a bulging front side, and an appropriate diffusion angle (θ) is set for each projection lens 48 so that the three images are formed at positions separated by the same distance in front of the lamp. .

In the drawing apparatus 11 of this embodiment, as shown in FIG. 5, three lamp units 51, 52 and 53 are constituted by three LED light sources 27, condenser lenses 28, shades 38 and projection lenses 48, respectively. there is The lamp units 51 to 53 are arranged side by side inside the lamp casing 41 (up and down in FIG. 5) with their optical axes 51A, 52A and 53A parallel to each other. The two images are superimposed at the same position to draw a multiple image G on the road surface G in front of the ramp (see FIG. 8).

Here, the light source board 21 is an optical component common to each of the lamp units 51 to 53, and three LED light sources 27 are mounted on this component. Similarly, the first lens base 22, the light shielding plate 23, and the second lens base 24 are also common optical components. Two shades 38 are transparently provided, and three projection lenses 48 are integrally formed on the second lens base 24 . These common optical components 21, 22, 23 and 24 allow the LED light source 27, condenser lens 28, shade 38 and projection lens 48 to be arranged at the same positions on the three optical axes 51A, 52A and 53A. ing.

Therefore, according to the rendering device 11 of this embodiment, as shown in FIG. The multiple image G can be drawn brightly and clearly on the road surface R. Further, by changing the emission colors of the LED light sources 27 of the lamp units 51 to 53 to, for example, blue, white, and green, it becomes difficult to see the green image in the cargo handling yard where the road surface R is painted green. The remaining two colors, blue and white, allow the multiple image G to be drawn clearly on the green road R.

Furthermore, since each unit 51 to 53 does not include a movable mirror, no special control is required, and the multiple image G can be easily drawn with an inexpensive configuration. Moreover, since the LED light source 27, the condenser lens 28, the shade 38, and the projection lens 48 are integrated by the optical parts 21, 22, 23, and 24 common to the three lamp units 51 to 53, the number of parts can be reduced. , the imposition error can be minimized to precisely superimpose the three images at the required positions. In particular, since the shade 38 is formed on the light-shielding plate 23 made of a thin plate made of transparent resin, it is possible to generate an image of a complicated shape with high precision and to sharpen the edge portion as compared with the case where a metal plate is cut out. has the advantage of being able to draw

It should be noted that the present invention is not limited to the above embodiment, and for example, as shown in FIG. Alternatively, it is also possible to appropriately change the shape and configuration of each part without departing from the spirit of the invention, such as drawing a multiple image G on the road surface R by superimposing more images.

1 forklift 11 drawing device 12 lamp casing 21 light source substrate 22 first lens base 23 light shielding plate 24 second lens base 27 LED light source 28 condenser lens 29 as first lens regulation wall 38 shade 39 opaque film 48 as second lens Projection lens 51 Lamp unit 52 Lamp unit 53 Lamp unit G Multiple image R Road surface

Claims (8)

A plurality of lamp units are provided inside a lamp casing, and each lamp unit includes a light source that generates visible light, a first lens that collects light from the light source, and a light emitted from the first lens that forms an image of a desired shape. and a second lens for projecting the formed image forward of the lamp,
the first lens is integrally molded on a first lens base common to each lamp unit;
The light source, the first lens, the shade and the second lens of the lamp unit are provided as a pair,
each said lamp unit comprising said light source, said first lens, said shade and said second lens;
All the lamp units have the same distance between the light source and the shade,
A drawing device, wherein a plurality of images projected from the second lens are superimposed at substantially the same position to draw a multiple image in front of the lamp. 2. A drawing apparatus according to claim 1, wherein said first lens, shade and second lens are arranged at the same position on the optical axis of each lamp unit. 3. A drawing apparatus according to claim 1 , wherein said first lens base is provided with a regulation wall for regulating mutual interference of light emitted from adjacent first lenses. A plurality of lamp units are provided inside a lamp casing, and each lamp unit includes a light source that generates visible light, a first lens that collects light from the light source, and a light emitted from the first lens that forms an image of a desired shape. and a second lens for projecting the formed image forward of the lamp,
The light source, the first lens, the shade and the second lens of the lamp unit are provided as a pair,
drawing a multiple image in front of the lamp by superimposing a plurality of images projected from the second lens at substantially the same position;
The first lens is integrally molded on a first lens base common to each lamp unit,
the first lens base is provided with a regulating wall for regulating mutual interference of light emitted from adjacent first lenses;
The regulation wall is provided between the light source and the shade in contact with a light shielding plate common to each lamp unit, and the regulation wall ensures a space between the first lens and the shade. Rendering device. 5. A drawing apparatus according to claim 3 , wherein a through hole is formed in said regulation wall for an assembly bolt to pass through, and said shade is assembled to the lamp casing by means of the assembly bolt. The drawing apparatus according to any one of claims 1 to 5 , wherein the second lens is integrally formed on a second lens base common to each lamp unit. 5. The drawing apparatus according to claim 4 , wherein the shade includes a transparent portion formed on the light shielding plate. 8. The drawing apparatus according to claim 7 , wherein a thin plate made of transparent resin is used for said light shielding plate, and the surface of the thin plate except for said light transmitting portion is covered with an opaque film.

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