JPS58108650A - Lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lamp, and particularly to a lamp in which incident light from the outside is reflected within the lamp and then emitted, so that the lamp appears to exist even though it is not excited. It concerns a lamp that prevents the generation of so-called "ghost" signals.

The system shown in FIG. 1 is one of a variety of systems that incorporate baffles into lamps to prevent the generation of "ghost" signals. In this system, light rays emitted from a light bulb 10 are reflected by a reflector 11 and then reach a lens element 12. A lens element 12 is disposed in conjunction with a baffle, indicated at 13, for refracting light rays in a pencil-like manner for passage through a light-transmissive portion or region of the buckle. Such systems require a focusing lens to pass the pencil beam through a full light transmission area. Depending on the radius of curvature of each lens surface of the lens element, the light emitted after passing through the baffle is expanded widely. Therefore, this system is unsuitable for generating light beams. In such a case,
A further lens element 15 is provided on the opposite side of the reflector 11 with respect to the baffle 13 in order to limit the spread of the light depending on the characteristics of the light beam. However, since the pencil-shaped rays have already expanded considerably when they reach the further lens element 15, the above-mentioned limitations may not be sufficient.

To solve this problem, the pencil-like beam needs to be small enough to cause an expansion when it exits the baffle 14. In order to keep the expansion small, the distance between the lens surface 16 of the lens element 12 and the baffle 13 is increased. By doing so, there is no need to refract the light beam to a large angle in order to make it pass through the light passage area 14 of the baffle 13. However, in this case, the thickness of the lens element 12 must be increased as shown in FIG. 2, or the lens element 12 and the baffle 13 must be separated as shown in FIG. , it is necessary to do one or the other. Increasing the thickness of lens element 12 greatly increases its manufacturing cost and also significantly increases the size of the lens element and baffle assembly. On the other hand, if the lens element 12 and the baffle 13 are separated by one, it will be difficult to achieve alignment between the lens 16 and the region 14, and the baffle 13 will not be held by the lens element 12. Therefore, there is a need for reinforcement.

The specification of published British Patent Application No. 2,079,919 shows the use of negative lenses to reduce the spread of light rays emitted from baffles. This negative lens surface is used to reduce the focusing of each pencil ray before passing through the light transmitting area of the buckle. That is, two lens plates are provided between the baffle and the reflector, and the lens plate near the reflector has a positive lens formed on its surface, which focuses the light rays directed toward the baffle. The lens plate provided on the baffle side forms a negative lens surface on the surface opposite to the baffle. Since the positive and negative lenses are formed on separate lens plates, the problem of alignment between the two still remains.
By using two lens plates, the volume of the lamp increases as compared to the case of one lens plate, and the manufacturing cost also increases.

This invention attempts to solve various problems as described above.

According to the invention, a baffle is provided which generally blocks light but has a plurality of light transmitting portions, and a light deflecting device is provided behind the baffle and located in front of the lamp. a transmitting member, each light deflecting device having a positive lens surface formed on a surface of the light transmitting member opposite to the baffle, and the positive lens surface converging the light beam directed toward the light transmitting portion of the baffle. The light transmitting member further has a formation on the surface facing the baffle, and each of the formations is designed as an additional lens element and serves to spread the light emitted from the baffle. There is provided a lamp, characterized in that each of the above-mentioned formations is formed at a position corresponding to a light-transmitting portion of the baffle.

FIG. 6 of U.S. Pat. No. 4,241,388 shows a light transmitting member used in a lamp of the type shown in FIG. 1 of the accompanying drawings, and a recess is formed on the buckle side of this member. has been done. However, these recesses are merely formed for the purpose of facilitating the formation of a baffle on this surface, and are not intended to form a lens surface as in the present invention.

Each formation is specifically designed as its own lens surface.

A light transmitting cover is provided on the opposite side of the reflector with respect to the baffle. The cover may be planar or lenticular, and if so, it may be colored by mixing a medium density light-absorbing additive.

If the formation is so constructed that the light spread is reduced only on one side, the lamp may be Glue the flap into an appropriate shape. For example, add grooves. The spread of the light beam can also be controlled by forming a lens surface on the light-transmitting cover.

It is advantageous if the baffle is mounted on the side of the light-transmissive member that has the formation. In this case, a plurality of recesses are formed on the buckle forming side of the light transmitting member, at least some of these correspond to the above formations, and the baffle is printed on the above side except for the recesses. It is constructed by attaching a light blocking substance by painting or adhesion.

The present invention will be described in detail below with reference to the accompanying drawings, FIG. 4 and subsequent figures.

First, referring to FIG. 4, the lamp beam is equipped with a flaper 20 shown at and \, which functions to direct the light emitted from the light bulb 21 toward the lens element 22. A) It has a paraboloid of revolution so that the light that reaches the lens element becomes parallel rays. Lens element 22 then focuses each pencil ray through a transparent area 23 of baffle 24. It is assumed that the portion of the baffle 24 other than the region 23 is opaque, and the size of the region 23 is limited to the minimum size necessary to allow the pencil-shaped light beam to pass through. While this allows all of the light emitted from the bulb 21 to pass through the baffle 24, the size of the region 23 is so small that no light from outside can pass through the baffle, thus No "ghost" signal is generated by reflection from reflector 20 and re-radiation.

Further, referring to FIG. 5, the lens element 22 includes a light-transmitting member (for example, made of a plastic member). The light-transmitting member beam has a series of positive lens surfaces 25 on the side facing the flaper 22, and a series of negative lens surfaces 26 on the side facing the baffle 24. Lens surface 25 is thus convex to the reflector, while lens surface 26 is concave to the reflector. Each lens surface 26 corresponds to one of the regions 25 of the baffle, and also corresponds to one of the lens surfaces 25, so that lens surfaces 25 and 26 form an optically cooperating optical pair. In each lens pair, the lens surface 25 focuses the light rays into a pencil shape, allowing the pencil to all pass through the area 25 of the baffle while keeping the distance between the lens surface 25 and the baffle 24 relatively small. While limiting the degree of focusing to be small, the lens surface 26 is designed to reduce the focusing of the rays in the vicinity of the region 23. Thus, the spread of light rays emanating from the baffle is improved, without the need to increase the thickness of lens element 22 or to separate it from the baffle, compared to the prior art systems described above. If you make it small enough, you can do it.

The final spread of each pencil ray emanating from the baffle is determined by the radius of curvature of the two lens surfaces 25 and 26 and the distance between them. However, the spread of the light rays is due to the size of the filament of the light bulb and the lens element 2
The variation occurs because the rays that reach 2 are not all parallel. This variation is utilized to give the lamp's output beam the required characteristics, without the need for additional special lens elements.

As is clear from the foregoing, lens surface 26 also forms a recess on one side of lens element 22. This recess makes it possible to directly print, paint, or adhere an opaque material to one side of the lens element when forming the baffle 24. If a recess is present, the region 25 will be formed by itself since no material will enter the recessed portion of the lens element. By forming the baffle in this manner, no masking is required and alignment problems between the regions and each lens surface are also resolved.

As an example of this approach, see U.S. Pat.
Hot oil self-listed in the specification No. 8
It is conceivable to form a shibatsuful in one ring.

For the portion where the lens element 22 is formed, the negative lens surface 26
Although it is not desirable to form a buckle, it is still necessary to form a recess in order to facilitate the formation of the buckle described above;
The base is made flat as shown in . When the baffle is printed and printed, the printing process is configured to create decora-sized patterning and/or lettering.

Referring again to Figure 4, the baffle 24 is now exposed.
If this happens, the damaged cavity 26 will become contaminated with dust and other substances. Therefore, it is desirable to provide a light transmitting cover 28 on the opposite side of the reflector 20 with respect to the baffle 24. This cover also constitutes the outer surface of the lamp itself. If the bracket 28 is provided, the outer surface of the lamp will match the shape of the device to which the lamp is attached. If the bracket is not provided, the outer surface of the lens element 22 will serve as a cover. This requires more effort to ensure that the baffle fulfills the requirements (for example, if the outer surface of the lens element is flat to flat). (It would be impossible to configure multiple layers by gluing the sheet to the lens element. Force, <
-28 can be flat or lenticular, in the latter case providing an influence on the adjustment of the characteristics of the light output beam of the lamp. By reducing the divergence of light reaching the cover from the lens 24,
This means that the beam characteristics can be controlled much more strongly. If it is necessary to make the interior of the lamp less visible, the cover may be provided with a mask or may be colored. The cover may also be constructed of medium-density light-absorbing material: this is the case if the lens element 22 is tinted and the tint is not to be discerned from outside the lamp when the bulb 21 is de-energized. used.

The types of lenses that can be employed for lens surfaces 25 and 26 are explained using FIGS. 7-11. In FIG. 7, lens surface 25 and lens surface 26 are both cylindrical lenses, i.e. curved in only one plane.
5 and 26 affect the spread of light only on these curved surfaces, but do not affect surfaces perpendicular to these curved surfaces. In order to control the spread on further surfaces, the reflector 20 is provided with suitable grooves and/or the cover 28 is provided with the properties of a lens. The lens surface 26 can also be configured to be convex or concave relative to the reflector in said further surface depending on the desired characteristics of the output beam. Figure 8 shows the lens surface 25.
It is a figure which shows what curved in the said further surface convexly.

The lens surface 26 can be curved not only on one surface but on two mutually orthogonal surfaces. In this case, it is preferable that the lens surfaces 25 are also curved on both sides of the lens. FIG. 9 is a diagram showing such an example, and the lens surfaces 25 are constructed so as not to be in close contact with each other. In this case, however, the space that can be used as the lens surface 25 cannot be effectively utilized, so the lens surface 25 is formed into a rectangular or hexagonal shape as shown in FIGS. 10 and 11. The aim is to make effective use of space. Lens surfaces 25 and 26 can be spherical and the radius of curvature can be different between mutually perpendicular surfaces. Also, lens surfaces 25 and 26
According to the method shown in British Patent No. 1,387,589, one or both of these can be constructed such that the middle part is cylindrical and both ends are rotary bodies. Lens surface 25 and/or
Alternatively, 26 may have other shapes, such as a flap that allows the horizontal extent to be larger than the vertical extent.

The type of lens used must be uniform for all lens elements. This is not the case; it can be different depending on the desired characteristics of the output beam of the lamp. The lens element 22 is usually manufactured by molding, but it can also be manufactured by extrusion molding or by rolling a sheet.

In the above description, each positive lens surface 25 is defined as lens surface 2.
It was supposed to focus the light in the direction of propagation behind the 6. Each lens surface 26 is then given a negative refractive property to reduce the focusing of the light before it passes through the region 23 of the baffle. However, the positive radius of curvature of each positive lens surface 25 is
If we assume that the pencil-shaped rays are focused in front of the lens surface 26 (i.e., that the rays are already diffused before reaching the lens surface 26), then the lens surface 26 is given a positive refractive property to focus the light rays before they pass through the light transmissive region 23 of the baffle.

The lamp of this invention can be used as a fog lamp or head lamp for automobiles.

However, this lamp can be used for a variety of purposes other than these, and is particularly suitable for places where goose-eye signals can cause danger or errors. When provided, lens element 22 is tinted.

Although the above-mentioned lamp beam reflector 20 is provided, the reflector is of course provided to reflect the light emitted by the light bulb 21 to the lens element 22. In other variants, not shown, the reflector 20 is replaced by other light focusing means, such as a Fresnel lens. In a further variation, both the reflector 20 and the bulb 21 can be replaced by a beam flex reflector or a retroreflector, ie one that reflects the incident light. In this case, baffle 24 and lens element 22 are not provided for ghost signal removal, but rather to make the reflex reflector invisible to normal vision, thus improving the appearance of the lamp. It is an attempt to make things better.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams for explaining the generation of "ghost" signals, Figure 4 is a cross-sectional view of the lamp of the invention, and Figures 5 and 6 are details of a portion of the lamp. FIG. 7 to FIG. 11 are diagrams showing other embodiments of lenses used in the lamp of the present invention. Code in the figure. 11...Reflector. 22... Light transmitting member. 23...Light transmitting part. 24...baffle. 25...Positive lens surface. 26...-Further lens surfaces or formations. 28...Cover. Agent Patent Attorney (8107) Kiyotaka Sasaki (and 3 others) (l!! FIG, l. FIG, 2゜

Claims (1)

[Claims] 1) A baffle (24) that blocks light but has a plurality of light transmitting parts (23), and a plurality of light bulbs arranged behind the baffle (24) and in front of the light bulb. and a deflection device, each light deflection device comprising a positive lens surface (25) and a baffle (24) for focusing a beam of light towards a corresponding one of the light transmitting portions (23) of the baffle (24). It has a further lens surface (26) for reducing the spread of the light rays emitted in the forward direction, and the positive lens surface (25) is located on the side of the light-transmitting member (22) on which the baffle (24) is formed. The light transmitting member (2) is formed on the opposite side of the light transmitting member (2).
2) has on its baffle (24) forming side a formation (26) designed to act as said further lens surface (26).
), and each formation (26) has a baffle (24).
A lamp characterized in that it is arranged optically adjacent to a light-transmitting part (23) of the lamp. 2) Lamp according to claim 1, characterized in that the formation (26) acts as a negative lens surface. 3) The baffle (24) is formed by the light transmitting member (22) (
26) is attached to the side on which the device is formed.
Lamps listed in section. 4) Said side of the light-transmitting member (22) has recesses, at least some of these recesses being adjacent to said formation (26).
), and the baffle (24) is formed by printing, painting, or gluing the light-blocking material except where the recess is formed on the above-mentioned side. A lamp according to claim 3, characterized in that: 5) The light transmitting cover (28) is arranged on the side of the light transmitting member (22) on which the baffle (24) is formed and is spaced apart from the light transmitting member (22). The lamp according to any one of item 4. 6) The lamp according to claim 5, characterized in that the cover (28) is a flat plate. 7) The lamp according to claim 5, wherein the cover (28) has a lens formed on its surface. 8) Claims 5, 6 and 7, characterized in that the cover (28) is colored.
The lamp according to any one of paragraphs. 9) Lamp according to claim 8, characterized in that the cover (28) consists of a medium-density light-absorbing material. 10) The lamp according to any one of claims 1 to 9, wherein the light transmitting member (22) is colored. 11) The further lens surface (26) reduces the spread of the light rays only on one surface, and the spread of the light rays on the further surface perpendicular to the one surface reduces the light transmission. It is arranged behind the member (22) or the flefter (11).
) is determined by making the shape of the
The lamp according to any one of paragraphs.