JPS581904A - Lamp apparatus for vehicle - 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 vehicular lamp, and more particularly to a vehicular lamp in which the brightness of the lens surface is made uniform and visibility is improved.

This type of vehicular lamp is designed to reduce the depth of the lamp by controlling the direct light from the light source directly with the front lens without using a rotating paraboloid shape that takes up space in order to make the lamp thinner. In order to achieve this, a front lens formed with a direct-illuminating flexible prism has been proposed.

Conventionally, in a vehicle lamp equipped with a front lens formed with a direct-light Fresnel prism, a light source C is disposed in a lamp chamber defined by a housing a and a front lens b, as shown in FIG. The front lens b forms a fish-class prism on its inner surface, and is connected to an outer lens d to control the emitted light (direct light) from the light source C as a light beam approximately parallel to the optical axis X. It consists of an inner lens f equipped with a so-called direct Fresnel prism, which has a refractive prism g in the center facing the light source C and a reflective prism h around it. As shown in the figure, the light incident on the inner lens f is incident within the range of angle α0, and is converted into a beam substantially parallel to the optical axis X by the direct-infrared Fresnel prism, and the fisheye prism of the outer lens d.
It is configured to collect light 511 to obtain a desired light distribution pattern.

However, in such conventional vehicle lamps, the lens surface is formed into a flat shape and the nozzle aK is disposed, so the direct illumination system formed on the inner lens f is particularly The emitted light (direct light) that enters the refractive prism g provided at the center facing the light source C of the Fresnel prism and the reflective prism h provided at the periphery of the Fresnel prism falls within the range of angle a'' as shown in the figure. The incident angle α0 is 18 because the inner lens f is flat.
It cannot exceed 0°. Therefore, since the light incident on the inner lens f is within the range of angle α0, the utilization rate of the luminous flux from the light source C is low, so that the entire lens surface appears dark, and in particular, the light incident on the reflective prism h that is far from the light source C is is in the range of the angle I0, which is a very small value compared to the value of the angle α0, so the amount of luminous flux is small and the luminous flux density is low. Although it can be seen, the reflective system is equipped with a prism h (Sho 5'l-1904 (2)) Dark areas appear on the sides, and such dark areas appear particularly prominently in lamps with horizontally elongated lens surfaces. .

The presence of such dark areas reduces the brightness of the lens surface, making it impossible to obtain a uniform light-emitting surface and making the lighting ring look unsightly.Also, the display light distribution function of signal lights etc. cannot be achieved sufficiently, reducing visibility. There are drawbacks such as:

In view of the above-mentioned circumstances, the present invention provides a lamp tube for a vehicle that effectively utilizes the luminous flux from the pulp and improves visibility by uniformizing the brightness over the entire surface of the lens. The purpose is to

Hereinafter, 1 of the vehicle lamps according to the present invention will be described. An example of implementation will be described with reference to the accompanying drawings.

The illustrated examples shown in FIGS. 2 to 24 are examples in which the present invention is applied to an automatic single-use taillight, and are defined by a 1Fi eight housing and a lens 2 disposed on the front surface of the housing 1. The pulp 5 is placed in the socket 51 in the lamp chamber 1o. Holder 5
2 and is connected to the pack cover 6.

C1 The front lens 2 includes an outer lens having a fisheye prism portion 21a f formed on the inner surface, and an inner lens 22 disposed on the inner surface, and a Fresnel/scum part is formed on the outer surface of the inner lens 22, and further, Light radiated forward from the light source (filament) P of the pulp 5 is incident on the central part 7 near the optical axis X (reference of the lamp) facing the pulp 5,
In addition, the light emitted backward by the light source P is arranged behind the pulp 5 on its original axis, and then the large amount of incident light reflected from the reflecting mirror 3 is controlled to be substantially parallel to the optical axis X. lens 2
A refraction system prism section 22a is formed to emit light in one direction. A large amount of incident light from the optical lens 4 (described later) is directed to the outer surface of the circumferential side part 8 (the part far from the light source P) around the central part 70 of the inner lens 22 into rays substantially parallel to the original axis X toward the outer lens 21. The refraction system prism section 22b that is controlled to have a shape.

More specifically, an optical axis X is located behind the reflective ash bulb 5.
The reflecting mirror 3 is formed on the inner surface of the back cover 6 so as to focus the light emitted backward from the light source P in the vicinity of the light source P. Since a reflective surface is formed to form a light source, a large amount of light from the reflected light is transferred to the inner lens 22.
The light is incident on the central portion 7 of the image.

Further, the optical lens 4 that emits a large amount of incident light to the peripheral side portion 8 of the inner lens 22 is disposed on the side of the pulp 5 substantially parallel to the optical axis Horizontal of pulp 5 perpendicular to @Yf: 7 on the outer surface side in the center
A second lens 42 is arranged in parallel with the second lens 41 on the outside thereof, and a 7-lens cut 42a is provided on the outer surface of the second lens 42. It is being formed. Furthermore, a seven-lens cut 41a formed on the outer surface of the second lens 41 is formed to emit the emitted light from the light source P toward a second lens 42 provided outward in a ray substantially parallel to the horizontal axis Y. The substantially parallel rays incident on the second lens 42 are directed to a refractive prism section 22b formed at 711 on the circumferential side 8 of the inner lens 22, through a Fresnel cut 42a formed on the outer surface side, to direct a large amount of light flux. The prism is designed to allow the light to enter.

Note that the first lens 41 and the second lens 42 of the optical lens 4
Fresnel cut 41 & formed on the outer surface side.

42m may be arbitrarily set as a 7-lens cut such as a concentric circle, a lattice shape, or a cylindrical shape depending on the shape of the 7-lens prism with the refractive prism part 22b provided on the peripheral side 8 of the inner lens 22.

Further, when a 7-Renel prism is applied to the inner font of the inner lens 22, a reflective prism portion is formed particularly on the peripheral side portion 8. This is due to the Fresnel cut formed on the outer surface side of the second lens 42 of the optical lens 4.
There is something f that is determined by the angle of the incident light from 42 m.

Since the configuration is as described above, the optical action when the bulb 5 is turned on is shown in FIGS. 3 and 4, and the light emitted forward from the light source P is directed toward the inner side as shown by the solid line in the figure. The center part 7 of the lens 22 near the optical axis X facing the lens 5
The light enters the flat surface of the inner surface, passes through the wall thickness, enters the refractive prism section 22a of the outer surface, is refracted into a ray substantially parallel to the optical axis X, and is emitted in the direction of the outer lens 1.

Further, the light radiated backward from the light source P enters the reflecting mirror 5 as shown by the dotted line in the figure, and is condensed near the light source P, so that a large amount of light flux is incident on the flat surface of the inner surface of the central portion 7. The light passes through the wall thickness, enters the refractive prism section 22m on the outer surface, is refracted into a ray substantially parallel to the optical axis X, and is emitted in the direction of the outer lens.

6. The light emitted from the light source P to the side enters the flat part of the first lens 41 of the optical lens 4 as shown by the dotted line in the figure, is transmitted therethrough, and enters the outer wall cut 41m. By this Fresnel cut 411, the light is controlled to be substantially parallel to the horizontal axis Y and emitted in the direction of the second lens 42, and the emitted light enters the flat part of the second lens 42, passes through its 11 thickness, and reaches the outer surface. A large amount of luminous flux with a high luminous flux density is emitted from the inner lens 22 toward the circumferential side 8 far from the light source, and is incident on the flat surface of the inner lens 42m. The incident light passes through the 11th wall thickness and is controlled by the refractive prism section 22b on the outer surface into a light beam 9G+ substantially parallel to the optical axis X, and is emitted toward the outer lens 21,
Each of the emitted lights is focused and diffused by the fisheye prism 21m of the outer lens 21, and is emitted in front of the lens to form a desired light distribution pattern.

In the vehicle lamp of the present invention, as shown in FIG. 4, the light emitted from the light source P is incident on the central portion 7 near the optical axis X of the inner lens 22, and the light emitted forward is The amount of light incident within the range of angle αT shown by the solid line in the figure is the same as in the conventional case. In addition, the light emitted backward from the light source P enters the reflector 5 placed behind the bulb 5, and the reflected light is in the vicinity of the -H light source P within the range of angle α''1 shown by the dotted line in the figure. The light is focused and a large amount of reflected light with high luminous flux density is made to enter the central part for compensation, similar to the emitted light from the light source.Furthermore, the light radiated laterally from the light source P is at an angle α shown by the dotted line in the figure.
The luminous flux in the range of ＠ is transmitted by a Fresnel cutter (4) formed on the outer surface of the first lens 41 of the optical lens 4 arranged on the side of the bulb 5.
1 m', the beam is controlled to be approximately parallel to the horizontal axis Y of the bulb 5, and the Fresnel cutout (10, l) formed on the outer surface of the second lens 42 is arranged outside of the horizontal axis Y of the bulb 5.
This allows a large amount of light flux with high light flux density to be incident on the peripheral side part 8 of the inner lens wave.

Therefore, the emitted light (direct light) from the light source P is at an angle α°l+
The luminous flux in the range of α03+α°1 can be effectively reflected.In addition, in this example, since the 7 Lennel prism parts 22a and 22b are formed on the outer surface of the inner lens, the loss is reduced due to the flat surface of the inner lens. The amount of light is small and the amount of effective luminous flux is increased.

Therefore, by allowing a large amount of light flux with high luminous flux density to enter the circumferential side part 8 of the lens 2, a dark part does not occur on the circumferential side part 8, and the central part emits light with a high tolerance of light quantity. This has the effect of making it possible to make the brightness of the entire surface of the lens uniform, and to obtain a wheel lamp with good lighting filling and good visibility.

Although this example has been described as having two optical lenses 4 that allow a large amount of light to enter the peripheral side 8 of the inner lens 22, a plurality of optical lenses 4 may be provided. Further, the optical lens 4 is arranged in the housing 1 or the pack cup (-6) by appropriate means.Furthermore, in the case of a lamp having an inner lens type double lens structure, the inner lens When a lattice Fresnel is formed on the inner or outer surface of the outer lens 21, the outer lens 21 may be a cover lens.
Furthermore, a Fresnel prism portion may be formed on the inner surface of the inner lens 22, and a fisheye prism portion may be formed on the outer surface (the 1*lens 2 may be formed of a single lens).

As is clear from the embodiments described above, the vehicle width lamp of the present invention is a lamp in which a light source is disposed within a lamp chamber defined by a pole arm and a lens disposed in front of the lamp. , the lens has a Fresnel prism part formed in a central part near the optical axis facing the light source and a central part around the central part, and the light radiated rearward among the light emitted from the light source is directed to the central part of the lens. A reflecting mirror is disposed behind the light source on the optical axis so as to allow a large amount of luminous flux to enter, and from the first lun and the second lun, the light emitted to the side is made into a substantially parallel ray to the horizontal axis perpendicular to the original axis. The present invention is characterized by comprising an optical lens means having a second lens for directing the incident light to the circumferential side of the lens and emitting a luminous flux with a large amount of light. This problem can be eliminated, and by effectively utilizing the luminous flux of the pulp, it is possible to compensate for the large amount of light that is originally dense at the local side of the lens, and to create a flexible light amount even in the center of the lens. It is possible to emit light with a high degree of brightness, thereby making it possible to uniformize the brightness over the entire surface of the lens, and to obtain a vehicle width lamp with good visibility.

[Brief explanation of the drawing]

Fig. 1 shows an explanatory diagram of a conventional lamp, Figs. 2 to 4 show an embodiment of the vehicle width lamp of the present invention, Fig. 2 is a front view of the lamp, and Fig. 5 is a sectional view of the main part. 4 are explanatory diagrams showing the optical effect. 1...Housing;, 2...Lens, 21.7.
Outer lens, 22... Inner lens, 22m
, 22b... Fresnel prism section, 6. ...Reflector, 4...Optical lens, 41...Luns, 42.
...Second lens, 5...Pulp, P...Light source, 8.
...Station side part, 10...Light chamber, X...Main axis. Patent applicant Ichikoh Industries Co., Ltd. Agent Patent attorney Tadashi Akimoto Figure 1

Claims (1)

[Claims] This is a lamp in which a light source is arranged in a lamp chamber defined by a housing and a lens arranged in front of the housing, and the lens has a Fresnel light in a central part near the light i facing the light source and a central part around the central part. A prism part is formed, and a reflecting mirror is arranged behind the light source on the optical axis so that a large amount of the light emitted backward from the light source enters the central part of the lens. An optical system comprising a first lun whose emitted light is a ray substantially parallel to a horizontal axis orthogonal to the optical axis, and an i2 lens which directs the incident light from the first lun to a central side of the lens and emits a large amount of luminous flux. A vehicle lamp characterized by comprising a lens means.