JP2008269901A - Lamp for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp for a vehicle capable of forming desired light distribution without futile diffusion, vertical and horizontal, and excellent in appearance at lighting on and off. <P>SOLUTION: The lamp for a vehicle is provided with a lamp chamber S formed by a lamp body 12 of which a front side opens and a front side lens 14 attached to the front side aperture of the lamp body 12, a light source 18 housed in the lamp chamber S, and a paraboloid reflector 20 reflecting light source light forward. The lens 14 is largely inclined against an optical axis of the reflector 20, and goes round from a front part to the side of a vehicle body. Horizontal diffusion reflection faces 22 are fitted to the reflector 20, cylindrical steps 15 as vertical diffusion transmission means are fitted on the lens 14, and minute step parts 16 crossing the steps 15 are fitted on surfaces of the steps 15 in equal intervals in a horizontal direction. Since the steps 15 have no horizontal diffusion function, and deviation of vertical and horizontal diffusion light emitted from the lens 14 in the horizontal direction can be ignored, light distribution control (light distribution design) can be easily carried out by that much. A parting line 16 (the minute step part 16) between adjacent steps appears in the lens 14 as a contiguity pattern, hence, an appearance at lighting is enhanced, and a transparent state of the lens 14 at lighting off is controlled. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicular lamp provided with a front lens arranged so as to go around from the front of a vehicle body, and in particular, the lamp chamber is not seen through while maintaining a predetermined light distribution performance. The present invention relates to a vehicular lamp.

  In the vehicular lamp disclosed in the following patent document (for example, an automobile marker lamp), a cylindrical step extending in the vertical direction is provided on the parabolic reflector surface, and a fisheye step having a horizontally long rectangular shape is provided on the front lens. By diffusing the left and right diffused light formed by the reflector (cylindrical step) in the vertical direction with the fisheye step of the front lens, a predetermined light distribution that spreads in the vertical and horizontal directions can be obtained. Moreover, the parting line between the fish-eye step elements extending vertically and horizontally in a lattice shape is suppressed from appearing as a lattice pattern on the front lens and being seen through the lamp chamber.

JP-A-11-283407

  However, in recent automobiles, the front end of the car body tends to be streamlined, especially in the case of a sign lamp that has a front lens that has a shape that wraps around sideways from the front of the car body. Since the eye step forming surface is greatly inclined with respect to the optical axis of the reflector, the lateral deviation of the diffused light emitted from the fisheye step cannot be ignored. Specifically, the diffusion angle toward the outside in the vehicle width direction is larger than the diffusion angle toward the inside in the vehicle width direction (the light distribution toward the outside in the vehicle width direction is larger than necessary), and a desired light distribution is obtained. The luminous efficiency is also poor.

  The present invention has been made in view of the above-described problems of the prior art, and the purpose thereof is to form a predetermined light distribution diffused without any waste in the vertical and horizontal directions, and is excellent in appearance at the time of lighting and non-lighting. It is to provide a vehicular lamp.

In order to achieve the above object, in the vehicular lamp according to claim 1, a container-shaped lamp body whose front side is open and a front lens for light distribution control attached to the front opening of the lamp body. A defined lamp chamber space, and a light source accommodated in the lamp chamber space and a light distribution control reflector that reflects the light source light forward,
In the vehicular lamp, the front lens is disposed so as to be inclined from the front portion of the vehicle body to the side by being inclined with respect to the optical axis of the reflector.
The reflector is provided with a diffuse reflection surface that diffuses and reflects light in the direction of the front lens,
The front lens is provided with a cylindrical step continuously extending in a step width direction extending in a band shape in the lens wrapping direction,
On the surface of the cylindrical step, minute step portions crossing the step are provided at substantially equal intervals in the step extending direction.

(Function) Light source light is diffused in the longitudinal direction (vertical direction) parallel to the front lens wrapping direction (horizontal direction) by the diffuse reflection surface of the reflector (for example, when the longitudinal section is formed by a parabola). After being reflected, when passing through the front lens, it is diffused also in the step width direction (vertical direction) by the cylindrical step, resulting in a predetermined light distribution that spreads forward, downward, left and right.

  In addition, although the light transmitted through the front lens is diffused in the step width direction (vertical direction), the horizontal sectional shape of the cylindrical step is the same along the step extending direction (along the step extending direction of the cylindrical step). Therefore, it is not diffused in the front lens wrapping direction (step extending direction, left-right direction). That is, unlike the fish-eye step, it is not diffused in the step width direction (up and down direction) and the front lens wrapping direction (step extending direction and left and right direction).

  For this reason, the deviation in the horizontal direction of the up / down / left / right diffused light emitted from the front lens (cylindrical step) can be ignored, and the vertical diffusion of the light distribution of the lamp is determined by the cylindrical step, and in the lens wrapping direction (left / right direction). Since the diffusion of the light is determined only by the diffusion step of the reflector, the light distribution control (light distribution design) is easier.

  In addition, the minute step portion provided on the cylindrical step surface of the front lens, in cooperation with the parting line between the upper and lower adjacent cylindrical steps, appears as a pattern that is continuous at substantially equal intervals on the front lens, Appearance when not lit is enhanced. In particular, when the light is not lit, external light is reflected by the minute step portion and looks like a streak, thereby preventing the front lens from being transparent. Note that the minute step portion has a slight depth (height) and thus does not affect the light distribution of the lamp.

  According to a second aspect of the present invention, in the vehicular lamp according to the first aspect, the diffuse reflection surface provided on the reflector is configured by a plurality of cylindrical steps extending in a direction orthogonal to the cylindrical step extending direction of the front lens. did.

  (Operation) The cylindrical step, which is the diffuse reflection surface of the reflector, reflects left and right diffused light that is not biased in the wraparound direction (left and right direction) of the front lens, so the left and right direction of diffused light emitted from the front lens (cylindrical step) The bias in is more negligible.

  According to a third aspect of the present invention, in the vehicular lamp according to the first or second aspect, a cylindrical step is provided on the front side of the front lens.

  (Operation) The parting line between the minute step portion provided on the cylindrical step surface of the front lens and the adjacent cylindrical step clearly appears as a continuous pattern on the front lens, and the appearance at the time of lighting and non-lighting is further enhanced. In particular, when the lamp is not lit, the front lens is not seen through because the external light is reflected by the minute step portion and looks sharp and streaky.

  According to a fourth aspect of the present invention, in the vehicular lamp according to any one of the first to third aspects, the cylindrical steps of the front lens are arranged such that the cylindrical steps adjacent in the vertical direction partially overlap in the step width direction. In addition, on the surface of each cylindrical step, first step elements and front step regular hexagons having slightly different curvatures are alternately arranged so as to be adjacent to each other. The parting line to be defined constitutes the minute step portion. That is, the first step element and the second step element are arranged at equal pitches in each cylindrical step. However, in the cylindrical steps adjacent to each other in the vertical direction, the arrangement pitches of the first step element and the second step element are different from each other. Are arranged so as to be continuously arranged in the left-right direction and the oblique direction.

  (Operation) On the surface of each cylindrical step, a minute step portion that is a parting line that defines the first step element and the second step element adjacent in the left-right direction, and an oblique direction on the surface of the cylindrical step adjacent above and below Minute step portions, which are parting lines that define the first step element (or second step element) and the first step element (or second step element) adjacent to each other, are substantially equidistant in the front lens. It appears as a continuous turtle shell pattern, and the appearance at the time of lighting and non-lighting is enhanced.

  Note that the minute step portion, which is a parting line that defines the first step element and the second step element that are adjacent in the left-right direction, is a step based on a slight difference in curvature of the adjacent step element surfaces, and is in an oblique direction. And the depth (height) of the minute step portion that is a parting line that defines the first step element (or the second step element) and the first step element (or the second step element) adjacent to each other. For this reason, the minute step portions (parting lines) that define each step element do not affect the light distribution of the lamp.

  According to the vehicular lamp according to the first aspect, since the deviation in the left-right direction of the diffused light emitted from the front lens (cylindrical step) can be ignored, light distribution control (light distribution design) is easy, and in the left-right direction. Predetermined light distribution diffused without waste is obtained without any bias.

  In addition, the minute stepped portion provided on the surface of each cylindrical step appears as a pattern that is continuous at approximately equal intervals on the front lens together with the parting line between the cylindrical steps that are adjacent to each other in the vertical direction. Is increased. In particular, when the light is not lit, the external light is reflected by the minute step portion and looks like a streak, so that the front lens cannot be seen through and the appearance is improved accordingly.

  According to the second aspect of the present invention, it is possible to obtain a predetermined light distribution that is more efficiently diffused vertically and horizontally without deviation in the left-right direction.

  According to the third aspect, since the continuous pattern appearing on the front lens becomes clear, the appearance at the time of lighting and non-lighting is further improved. Therefore, the front lens does not pass through and the appearance is improved.

  According to the fourth aspect of the present invention, a minute step portion, which is a parting line that defines a stepwise hexagonal step element adjacent in the left-right direction and the oblique direction, appears on the front lens as a tortoiseshell pattern, and is turned on and off. The appearance of time will be innovative.

  Hereinafter, embodiments of the present invention will be described based on examples.

  1 to 6 show an automobile marker lamp according to an embodiment of the present invention, FIG. 1 is a front view of the marker lamp, and FIG. 2 is a horizontal sectional view of the marker lamp (line II-II shown in FIG. 1). 3 is a longitudinal sectional view of the marker lamp (a sectional view taken along line III-III shown in FIG. 1), and FIG. 4 is an optical system for light distribution control, which is a main part of the marker lamp ( FIG. 5 is a view showing a minute step portion provided on the cylindrical step surface of the front lens, (a) is a front view of the rear side of the front lens, and (b) is a perspective view of the reflector cylindrical step and the front lens cylindrical step). ) Is a sectional view taken along line Vb-Vb in (a), (c) is a sectional view taken along line Vc-Vc in (a), (d) is a sectional view taken along line Vd-Vd in (a), and FIG. Reference numeral 6 denotes a first step element and a second step provided on the surface of the cylindrical step adjacent in the vertical direction. Tsu is a front of the front lens back side view of changing the sequence of up element.

  In these drawings, an automotive marker lamp 10 includes a container-shaped lamp body 12 having an open front surface, a front lens 14 for light distribution control attached to the front opening of the lamp body 12, and a lamp body 12. And a lens 14, and a light source bulb 18 disposed in the lamp chamber S defined by the lens 14. A parabolic reflector 20 for light distribution control is integrally formed on the inner surface of the lamp body 12 so as to face the front lens 14. Reference numeral 13a denotes a seal groove, and reference numeral 14a denotes a seal leg.

  The front lens 14 is arranged so as to be inclined to the optical axis L of the lamp 10 which is a light source unit constituted by the reflector 20 and the bulb 18 and to largely go sideways from the front portion of the vehicle body. On the back surface, a cylindrical step 15 having a cross-sectional saddle shape extending in a strip shape in the left-right direction, which is a direction around the lens, is arranged in parallel in the vertical direction.

  On the other hand, on the surface of the reflector 20, a cylindrical step 22 having a vertical cross-sectional shape extending in a strip shape in the vertical direction is arranged in parallel in the left-right direction, so that the diffuse reflection surface diffuses light in the left-right direction, which is the lens wrapping direction. Is provided.

  For this reason, the light emitted from the light source bulb 18 is reflected by the cylindrical step 22 of the reflector 20 so as to be diffused in the longitudinal direction (up and down direction) and diffuse in the lens wrapping direction (left and right direction). Is transmitted in the step width direction (vertical direction), which is a direction orthogonal to the lens wrapping direction, by the cylindrical step 15, thereby obtaining a predetermined light distribution that spreads forward, downward, left and right of the vehicle.

  Further, although the light transmitted through the front lens 14 (cylindrical step 15) is diffused in the width direction (vertical direction) of step 15, the cross-sectional shape of the cylindrical step 15 is substantially the same along the step extending direction. (The height along the step extending direction of the cylindrical step 15 is substantially constant), so that it is not diffused in the lens wrapping direction (step extending direction, left-right direction). That is, unlike the fish-eye step transmitted light disclosed in the prior art, it is not diffused in the step width direction (vertical direction) and the lens wrapping direction (step extending direction, left-right direction).

  For this reason, the deviation in the horizontal direction of the up / down / left / right diffused light emitted from the front lens 14 (cylindrical step 15) can be ignored, and the vertical diffusion of the light distribution of the marker lamp 10 is determined by the cylindrical step 15, and the lens turning direction Since the diffusion in the (left-right direction) is determined only by the cylindrical step 22 of the reflector 20, light distribution control (light distribution design) is easier.

  In addition, as shown in an enlarged view in FIG. 5, the cylindrical steps 15 are arranged so that the cylindrical steps 15, 15 adjacent to each other partially overlap in the step width direction, and on the surface of each cylindrical step 15. The first step elements 15a and the second step elements 15b having a regular hexagonal shape in front view with slightly different curvatures are adjacent to each other at an equal pitch and are adjacent to each other in the vertical direction. Are arranged so that the arrangement pitch of the step elements 15a and 15b is shifted by a half pitch.

  Therefore, the parting line 16 (16a) which is a minute step portion defining the step elements 15a and 15b adjacent in the left-right direction and the first step element adjacent in the oblique direction between the cylindrical steps 15 and 15 adjacent in the vertical direction 15a (or the second step element 15b) and the first step element 15a (or the second step element 15b) are minute step portions 16 (16b, 16c, 16d) that are parting lines that define the front lens 14 In FIG. 1, it appears as a tortoiseshell pattern (see FIGS. 1 and 4) that continues substantially at regular intervals, and the appearance at the time of lighting and non-lighting is enhanced. In particular, at the time of non-lighting, external light is reflected by the parting line 16 that is a minute step portion and looks like a streak, thereby preventing the front lens 14 from being transparent.

  That is, as shown in FIGS. 5A, 5B, 5C, and 5D, the curvature radius Ra of the first step element 15a and the curvature radius Rb of the second step element 15b are expressed as Ra < Rb (Rb−Ra = minute height h) is formed at the boundary between the first step element 15a and the second step element 15b adjacent to each other on the left and right. The difference (h) becomes a minute step portion, and a parting line 16a between adjacent step elements 15a and 15b is formed. Between the first and second step elements 15a and 15b that are obliquely adjacent to each other between the cylindrical steps 15 and 15 that are vertically adjacent to each other, between the first step elements 15a and 15a, or the second step elements 15b and 15b. The parting lines 16b, 16c, and 16d are also formed at the boundary between the minute step portions corresponding to the difference in height of the surface shape of each step element.

  Note that the parting line (a minute step portion) 16a defining the first step element 15a and the second step element 15b adjacent in the left-right direction is slightly based on a slight difference in curvature of the surface of each step element. Since the parting lines (micro step parts) 16b, 16c, and 16d that define step heights (depth steps) between step elements adjacent in the oblique direction are also slight height (depth) steps, The parting line (small step portion) defining the step element does not affect the light distribution of the lamp.

  The arrangement of the first step element 15a and the second step element 15b provided in the cylindrical step 15 is such that the first step elements 15a (second step elements 15b) are arranged in an oblique direction as shown in FIG. A continuous arrangement may be used, and the turtle shell pattern that appears on the front lens 14, the light emission of the front lens 14, and the light distribution formed by the lamp, when viewed as a lamp, are the first step element 15a and the second step element shown in FIG. This is almost the same as the arrangement of the step elements 15b.

  FIGS. 7 and 8 are cross-sectional views showing minute step portions provided on the cylindrical step surface of the front lens, which is the main part of the automobile marker lamp according to the second and third embodiments of the present invention.

  In the first embodiment, the front step regular hexagonal first step element 15a and second step element 15b having slightly different curvatures are arranged adjacent to the surface of the cylindrical step 15. The parting line 16 that defines the step elements 15a and 15b constitutes a minute step portion that crosses the cylindrical step 15. However, in the second and third embodiments, the minute step portion that intersects the cylindrical step 15 is V-shaped. It is configured by a groove 17a and a U-shaped groove 17b. 6 and 7 is a parting line between the cylindrical steps 15 and 15 adjacent in the vertical direction.

  In the second embodiment shown in FIG. 7, V-shaped grooves 17a are provided on the surface of each cylindrical step 15 at substantially equal intervals in the step extending direction. In the third embodiment shown in FIG. U-shaped grooves 17b are provided at approximately equal intervals in the direction.

  The operation of the parting line 16e between the cylindrical steps 15 and 15 adjacent to the upper and lower sides and the V-shaped groove 17a and the U-shaped groove 17b, which are minute steps, is the same as the parting line 16 in the above-described embodiment, and redundant description thereof. Is omitted.

  It is to be noted that the V-shaped grooves 17a and U-shaped grooves 17b, which are minute stepped portions, are defined by the vertical arrangement (parting line 16e between the cylindrical steps 15 and 15 adjacent to the upper and lower sides and the V-shaped grooves 17a and U-shaped grooves 17b. Step elements) may be arranged in a straight line in the vertical direction, or may be arranged at a predetermined pitch in the horizontal direction, and the pattern appearing on the front lens is a lattice pattern in the former, and a staggered pattern in the latter It becomes.

  In the first to third embodiments described above, the cylindrical step 15 is provided on the back surface side of the front lens 14. However, the cylindrical step 15 may be provided on the front surface side of the front lens 14.

  When the cylindrical step 15 is provided on the front surface side of the front lens 14, a minute step portion that crosses the cylindrical step 15 and a continuous pattern formed by a parting line between the adjacent cylindrical steps 15 and 15 are clearly visible on the front lens 14 and are turned on. And the appearance when not lit is further enhanced. In particular, when the lamp is not lit, the external light is reflected by the minute step portion and looks sharp and streaks, which is more effective for the problem that the interior of the lamp chamber S is transparent.

It is a front view of the marker lamp for vehicles which is one example of the present invention. It is a horizontal sectional view (sectional view along line II-II shown in FIG. 1) of the marker lamp. It is a longitudinal cross-sectional view (cross-sectional view which follows the line III-III shown in FIG. 1) of the marker lamp. It is a perspective view of the optical system for light distribution control (the cylindrical step of a reflector and the cylindrical step of a front lens) which is the principal part of the marker lamp. It is a figure which shows the micro level | step difference part provided in the cylindrical step surface of a front lens, (a) is a front view of a front lens back surface side, (b) is sectional drawing which follows the line Vb-Vb of (a), (c). (A) is a sectional view taken along line Vc-Vc, and (d) is a sectional view taken along line Vd-Vd in (d). It is the front view of the front lens back side which changed the arrangement of the 1st step element and the 2nd step element which are provided in the surface of the cylindrical step adjacent up and down. It is sectional drawing which shows the micro level | step difference part provided in the cylindrical step surface of the front lens which is the principal part of the marker lamp for motor vehicles which is the 2nd Example of this invention. It is sectional drawing which shows the micro level | step difference part provided in the cylindrical step surface of the front lens which is the principal part of the marker lamp for motor vehicles which is the 3rd Example of this invention.

Explanation of symbols

10 Car sign lights (vehicle lamps)
12 Lamp Body 14 Front Lens 15 Cylindrical Step 15a for Vertical Diffusion Control Step Element 15b with Small Curvature Radius Step Element 16 with Large Curvature Radius (16a-16d) Parting Line (Small Stepped Part) that Defines Step Element
S Light chamber 17a V-shaped groove (small step)
17b U-shaped groove (small step)
18 Light source bulb (light source)
20 Parabolic reflector 22 Cylindrical step for lateral diffusion control

Claims (4)

A lamp room space defined by a container-shaped lamp body whose front side is open and a front lens for light distribution control attached to the front opening of the lamp body; a light source housed in the lamp room space; A light distribution control reflector that reflects the light source light forward, and
In the vehicular lamp, the front lens is disposed so as to be inclined from the front portion of the vehicle body to the side by being inclined with respect to the optical axis of the reflector.
The reflector is provided with a diffuse reflection surface that diffuses and reflects light in the direction of the front lens.
The front lens is provided with a cylindrical step continuously extending in a step width direction extending in a band shape in the lens wrapping direction,
A vehicular lamp characterized in that on the surface of the cylindrical step, minute step portions crossing the step are provided at substantially equal intervals in the step extending direction.   2. The vehicular lamp according to claim 1, wherein the diffuse reflection surface provided on the reflector is configured by a plurality of cylindrical steps extending in a direction orthogonal to a cylindrical step extending direction of the front lens.   The vehicular lamp according to claim 1, wherein a cylindrical step is provided on the front side of the front lens.   The cylindrical steps of the front lens are arranged so that the cylindrical steps adjacent to each other in the vertical direction are partially overlapped in the step width direction, and the front hexagonal shape with a slightly different curvature is provided on the surface of each cylindrical step. The first step element and the second step element are arranged so as to be adjacent to each other, and a parting line that defines each step element constitutes the minute step portion. The vehicle tool according to any one of the above.

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