JP2019021602A - Lens unit and vehicular lighting fixture - Google Patents

Abstract

To provide a lens holder and an optical lens unit capable of reducing size of a unit and size of a lens and reducing cost accordingly.SOLUTION: A lens holder 3 for vehicular lighting fixture 100, in the optical lens holder 3 for holding a plurality of lenses 2a-2d so that a central axis of each lens coincides with an optical axis O of a light source 101, includes: a first lens holder 3A for holding at least one lens; and a second lens holder 3B which holds a plurality of lenses and on which the first lens holder 3A is mounted on the light emission side of the plurality of lenses. The first lens holder 3A is provided so as to be overlapped with the second lens holder 3B in the optical axis direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lens unit and a vehicular lamp.

  Conventionally, what has a lens unit which consists of a plurality of optical lenses as a vehicular lamp is known (for example, refer to the following patent documents 1). In this vehicular lamp, a plurality of optical lenses constituting the lens unit are accommodated in a lens holder.

Japanese Patent Laid-Open No. 2006-134357

  In the above prior art, lenses having larger sizes are sequentially assembled in the lens holder that accommodates a plurality of optical lenses as the distance from the light source side increases. For this reason, the opening side of the lens holder is gradually increased as the distance from the light source side is increased according to the size of each lens, and it is difficult to reduce the size of the entire unit. Further, the optical lens away from the light source becomes thicker as it becomes larger, but it is very difficult to mold such a large and thick lens, which leads to an increase in cost.

  One aspect of the present invention is made in view of the above-described problems of the prior art, and an object thereof is to provide a lens unit and a vehicular lamp that can realize downsizing and cost reduction.

  The lens unit of one embodiment of the present invention includes a plurality of lenses on which light from a light source is incident, and an optical lens holder that holds the plurality of lenses so that each central axis coincides with the optical axis of the light source. The optical lens holder includes: a first lens holder that holds at least one of the lenses; and a second lens holder that holds the plurality of lenses and is attached to the light source side of the first lens holder. The first lens holder is provided so as to overlap with the second lens holder in a direction along the optical axis.

  According to the lens unit of this embodiment, the size of any lens installed in the first lens holder is smaller than any lens installed in the second lens holder. Therefore, the lens can be made difficult to be larger than the conventional configuration in which a plurality of lenses whose diameters are enlarged along the optical axis direction are sequentially arranged. Therefore, it is possible to reduce the size of the lens unit itself.

  In the above configuration, the first lens holder may be attached to the second lens holder in a state of being inserted inside the second lens holder.

  According to this configuration, the size of the lens unit 102 in the optical axis direction can be reduced.

  In the above-described configuration, the first lens holder is provided on the second lens holder side in the direction along the optical axis, and the light-shielding portion is formed around the opening. It is good also as a structure which has these.

  According to this configuration, stray light of light transmitted through the lens held by the second lens holder can be shielded. Further, since the first lens holder is provided with the light shielding portion, it is not necessary to separately provide a light shielding member, so that the number of parts can be reduced.

  In the above configuration, a plurality of lenses are held in the first lens holder, and a diameter of at least one of the plurality of lenses held in the first lens holder is in the second lens holder. It is good also as a structure smaller than the diameter of at least 1 lens of the some lens hold | maintained.

  According to this configuration, the lens unit can be downsized as described above.

  A vehicular lamp according to an aspect of the present invention includes the lens unit and a light source device that emits light to the lens unit.

  According to the vehicle lamp of this embodiment, since the lens unit is provided, a small and low-cost vehicle lamp can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the lens unit and vehicle lamp which can implement | achieve size reduction and cost reduction can be provided.

FIG. 2 is an exploded perspective view showing a schematic configuration of a vehicular lamp. Sectional drawing which shows schematic structure of a vehicle lamp. The top view of a 1st lens holder. The front view of a 1st lens holder. The side view of a 1st lens holder. The top view of a 2nd lens holder. The front view of a 2nd lens holder. The side view of a 2nd lens holder.

  Hereinafter, an optical lens unit according to an embodiment of the present invention will be described with reference to the drawings. In the drawings used in the following description, in order to make the features easier to understand, the portions that become the features may be shown enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. .

In the present embodiment, a vehicle lamp used for a vehicle headlamp (headlamp) or the like mounted in front of the vehicle and an optical lens unit used for the vehicle lamp are exemplified.
In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the X-axis direction is the light emission direction from the vehicle lamp, the X-axis direction is a direction parallel to the left-right direction of the vehicle on which the vehicle lamp is mounted, and the Y direction is in the Z-axis direction and the X-axis direction. The directions are orthogonal to each other.

FIG. 1 is an exploded perspective view showing a schematic configuration of a vehicular lamp according to the present embodiment. FIG. 2 is a cross-sectional view illustrating a schematic configuration of the vehicular lamp.
A vehicle lamp 100 according to this embodiment shown in FIG. 1 is a vehicle headlamp (headlamp) that emits light toward the front (+ Z-axis direction) of the vehicle, for example.

  As shown in FIG. 1, the vehicular lamp 100 includes a light source device (light source) 101 and a lens unit 102. The light source device 101 has a configuration in which light emitting elements made of, for example, LED elements are mounted on a substrate in a matrix within a plane orthogonal to the optical axis.

  The lens unit 102 constitutes a projection optical system that projects light emitted from the light source device (light source) 101 forward. The lens unit 102 includes a plurality of lenses 2a, 2b, 2c, and 2d and an optical lens holder 3 that holds these lenses 2a to 2d.

  The lens unit 102 projects a corresponding image of a predetermined light distribution pattern formed by the light source device 101 forward, and is a virtual vertical screen facing the vehicle lamp 100 (a position about 25 m ahead of the vehicle lamp 100 in the vehicle). A predetermined alignment pattern (high beam alignment pattern) is formed on the substrate.

  As the lenses 2a, 2b, 2c, and 2d, it is possible to use glass made of glass having high heat resistance, but it is preferable to use a resin lens for weight reduction.

  As shown in FIGS. 1 and 2, the optical lens holder 3 includes a first lens holder 3A and a second lens holder 3B. The first lens holder 3A is provided to overlap the second lens holder 3B and the direction along the optical axis O of the light source device 101 (Z-axis direction).

  In the present embodiment, the first lens holder 3A is attached in a state where substantially the entire lens holder 3A is inserted inside the second lens holder 3B in the optical axis O direction. The first lens holder 3 </ b> A and the second lens holder 3 </ b> B are assembled together by engaging the engaging portions provided on each of them. The configuration of the engaging portion will be described later.

  As shown in FIGS. 1 and 2, the optical lens holder 3 holds the lenses 2 a, 2 b, 2 c, and 2 d so that the central axes thereof coincide with the optical axis O of the light source device 101. In the present embodiment, two lenses are held in each of the first lens holder 3A and the second lens holder 3B.

  The number of lenses held by the first lens holder 3A and the second lens holder 3B is not limited to the present embodiment. The first lens holder 3A has at least one lens, and the second lens holder 3B has a plurality of lenses. For example, each lens holder 3A, 3B may be configured to hold three or more lenses.

(First lens holder 3A)
Hereinafter, the configuration of the first lens holder 3A will be described. FIG. 3 is a plan view of the first lens holder 3A. FIG. 4 is a front view of the first lens holder 3A. FIG. 5 is a side view of the first lens holder 3A.

  The first lens holder 3A has a cylindrical shape as shown in FIGS. 2 to 5, and has an opening 22 centered on the optical axis O at the base end 21a (the end on the light source device 101 side) in the optical axis O direction. And a light shielding portion 23 formed in an annular shape around the opening 22.

  The opening 22 has a size capable of passing the central light flux of the light projected from the third lens 2c and the fourth lens 2d held by the second lens holder 3B. The light-shielding portion 23 has a radial width W (see FIG. 4) that is a component that becomes stray light out of the light transmitted through the third lens 2c and the fourth lens 2d held by the second lens holder 3B shown in FIG. It has the dimensions necessary for shading.

  In the present embodiment, the first lens holder 3A has a cylindrical shape whose diameter increases from the proximal end portion 21a side close to the light source device 101 to the distal end portion 21b side separated from the light source device 101. Two lenses 2b are held. The first lens holder 3A includes a first lens holding portion 39 for holding the first lens 2a and the second lens 2b side by side along the optical axis O direction (hereinafter also referred to simply as the axial direction). A second lens holding portion 38 is formed.

  The first lens holding portion 39 that holds the first lens 2a is provided so as to extend from the distal end portion 21b on the enlarged diameter side to the outer side in the optical axis direction (the side opposite to the base end portion 21a). Three are formed at equal intervals around.

  Two of the three first lens holding portions 39 extend from the curved portions 26 and 26 on both sides of the first flat surface portion 25 as shown in FIGS. 3 and 4, and the remaining one first lens holding portion. 39 extends outward in the axial direction from the second flat surface portion 27 that faces the first flat surface portion 25 in the radial direction. The first lens holder 3 </ b> A holds the first lens 2 a by these three first lens holding portions 39.

  Here, as shown in FIG. 2, each first lens holding portion 39 receives light from the distal end portion 31b of the second lens holder 3B in a state where the first lens holder 3A is inserted and held in the second lens holder 3B. Project in the injection direction (+ X direction). Therefore, the first lens 2a is held outside the second lens holder 3B by the first lens holding portions 39.

  On the other hand, three second lens holding portions 38 for holding the second lens 2b are located in the vicinity of the approximate center in the axial direction and are formed at equal intervals around the axis. Two of these three second lens holding portions 38 are formed on the curved portions 26 and 26 on both sides of the first plane portion 25, and the remaining one first lens holding portion 39 is formed on the first plane portion 25. Has been. The first lens holder 3A holds the second lens 2b by these three second lens holding portions 38.

  As shown in FIGS. 3 and 5, the first lens holder 3 </ b> A is provided with four first engaging portions 11 for fitting into the second lens holder 3 </ b> B. The first engaging portion 11 has a convex hook shape protruding outward in the radial direction, and a total of four first engaging portions 11 are formed on each bending portion 26. Two are formed on the outer surface of the second lens holding portion 38 formed on the bending portion 26, and the other two are formed directly on the outer surface of each bending portion 26.

(Second lens holder 3B)
Next, the configuration of the second lens holder 3B will be described. FIG. 3 is a plan view of the first lens holder 3A. FIG. 6 is a plan view of the second lens holder 3B. FIG. 7 is a front view of the second lens holder 3B. FIG. 8 is a side view of the second lens holder 3B.

  As shown in FIGS. 2 and 6 to 8, the second lens holder 3 </ b> B includes a cylindrical holder main body 31 extending in the optical axis O direction (Z-axis direction) than the first lens holder 3 </ b> A, and the holder main body 31. A pair of extending portions 32, 32 extending outward from both sides in the X-axis direction. The second lens holder 3B supports, for example, the light source device 101 via a screw member 103 (see FIG. 2) screwed into the screw holes 32b (see FIGS. 2 and 7) of the extending portions 32 and 32. Attached to a supporting member (not shown) or the like.

  The second lens holder 3B is approximately twice as long as the first lens holder 3A in the optical axis O direction (hereinafter sometimes simply referred to as the axial direction). The holder main body 31 has a tapered shape whose diameter increases from the proximal end portion 31a close to the light source device 101 to the distal end portion 31b, and holds the third lens 2c and the fourth lens 2d (see FIGS. 1 and 2) on the inner side. The holder main body 31 is formed with a third lens holding portion 33 and a fourth lens holding portion 34 for holding the fourth lens 2d and the third lens 2c side by side in the axial direction.

  Three third lens holding portions 33 for holding the third lens 2c are located in the vicinity of the approximate center of the holder main body 31 in the axial direction, and three third lens holding portions 33 are formed at equal intervals around the axis. Two of the three third lens holding portions 33 are formed on the curved portions 36 and 36 of the holder main body 31 so as to be along one surface (the surface on the tip portion 31b side) of the extending portions 32 and 32. Yes. The remaining third lens holding portion 33 is formed on the second plane portion 37.

  Each third lens holding portion 33 is positioned closer to the distal end portion 31b than each fourth lens holding portion 34 in the axial direction as shown in FIG. 6, and is viewed in the optical axis O direction shown in FIG. The positions around O coincide with the respective fourth lens holding portions 34. The third lens holding unit 33 holds the third lens 2 c by the three third lens holding units 33. In the present embodiment, the diameter of the second lens 2b held in the first lens holder 3A is smaller than the diameter of the third lens 2c held in the second lens holder 3B.

  As shown in FIGS. 7 and 8, the fourth lens holding portion 34 that holds the fourth lens 2 d is located in the vicinity of the proximal end portion 31 a on the reduced diameter side of the holder main body 31, and 3 at equal intervals around the axis. One is formed. Two of the three fourth lens holding portions 34 are formed on the curved portions 36 and 36 on both sides of the first flat portion 35 of the holder main body 31, and the remaining one fourth lens holding portion 34 is formed on the first flat surface. It is formed on a second flat surface portion 37 that faces the portion 35 in a direction parallel to the Y-axis direction. The fourth lens holding unit 34 holds the fourth lens 2 d by these three fourth lens holding units 34.

  The second lens holder 3B is provided with four second engaging portions 12 for attaching the first lens holder 3A on the distal end portion 31b side of the holder body 31. The second engagement portion 12 has an engagement hole 12a that passes through the thickness direction of the bending portion 36, and corresponds to the first engagement portion 11 of the first lens holder 3A.

  As described above, in the present embodiment, the optical lens holder 3 according to the present invention is configured by being attached with the first lens holder 3A inserted inside the second lens holder 3B.

  Specifically, the first lens holder 3A is attached to the second lens holder 3B in a state of being inserted on the light emitting side of the third lens 2c and the fourth lens 2d on the distal end portion 31b side of the holder body 31. It has been. Further, the first lens holder 3A, the second lens holder 3B, and the first lens holder 3A are engaged with the engagement holes 12a of the second engagement part 12 of the second lens holder 3B. Are integrated to form the optical lens holder 3.

  The lens unit 102 according to the present invention is configured by housing two lenses in each of the first lens holder 3 </ b> A and the second lens holder 3 </ b> B of the optical lens holder 3.

  Since the lens unit 102 of the present embodiment is configured so that the first lens holder 3A overlaps the second lens holder 3B in the optical axis O direction, the second lens unit 102 is installed in the first lens holder 3A. The size of the lens 2b can be made smaller than the diameter of the third lens 2c installed in the second lens holder 3B. Therefore, the lenses 2a to 2d can be made less likely to be larger than the conventional configuration in which a plurality of lenses whose diameters increase along the optical axis direction are sequentially arranged. Therefore, the lens unit 102 itself can be reduced in size. Further, since the first lens holder 3A is attached in a state of being inserted inside the second lens holder 3B, the size of the lens unit 102 in the optical axis direction can be reduced.

  In addition, a thick lens has a problem in that as the diameter increases, a molding time is required, so that the cost increases and the difficulty of molding increases. On the other hand, in the present embodiment, since the lenses 2a to 2d having a small diameter can be adopted as described above, it is possible to form a lens with good dimensional accuracy, and it is possible to reduce the cost as the molding time is shortened.

  Further, according to the lens unit 102 of the present embodiment, the light shielding portion 23 provided on the base end portion 21a of the first lens holder 3A causes the outer periphery of the third lens 2c and the fourth lens 2d of the second lens holder 3B. Light flux (glare) that can be emitted and become stray light can be shielded.

  Further, in the conventional configuration, a spacer is disposed between the lenses in order to fix the lenses. The spacer has also been used as a member that blocks stray light from the light source.

  On the other hand, according to the present embodiment, the first lens holder 3A has the light-shielding portion 23, and the lens holders 3A and 3B can be engaged with each other so that the intervals between the plurality of lenses 2a to 2d can be maintained. Parts corresponding to conventional spacers can be omitted. Thereby, the number of parts can be reduced and the assembly work can be simplified.

  Note that the diameter of at least one of the plurality of lenses held in the first lens holder 3A is larger than the diameter of at least one of the plurality of lenses held in the second lens holder 3B. It may be a small configuration. In this way, it is possible to make it difficult to increase the size of the lens as compared with the conventional configuration in which a plurality of lenses whose diameters are increased as the distance from the light source is increased along the optical axis direction.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  2a ... 1st lens, 2b ... 2nd lens, 2c ... 3rd lens, 2d ... 4th lens, 3 ... Optical lens holder, 3A ... Lens holder, 3A ... 1st lens holder, 3B ... 2nd lens holder, 22 DESCRIPTION OF SYMBOLS Opening, 23 ... Light-shielding part, 100 ... Vehicle lamp, 102 ... Lens unit, 101 ... Light source device (light source).

Claims (5)

A plurality of lenses that receive light from the light source;
An optical lens holder that holds the plurality of lenses such that each central axis coincides with the optical axis of the light source;
The optical lens holder includes a first lens holder that holds at least one of the lenses;
A second lens holder that holds the plurality of lenses and is attached to the light source side of the first lens holder;
The lens unit, wherein the first lens holder is provided to overlap the second lens holder in a direction along the optical axis.   The lens unit according to claim 1, wherein the first lens holder is attached to the second lens holder in a state of being inserted inside the second lens holder.   The first lens holder includes an opening centered on the optical axis and a light shielding portion formed around the opening, provided on the second lens holder side in a direction along the optical axis. The lens unit according to claim 1 or 2.   A plurality of lenses are held in the first lens holder, and a diameter of at least one lens of the plurality of lenses held in the first lens holder is a plurality of lenses held in the second lens holder. The lens unit according to any one of claims 1 to 3, wherein the lens unit is smaller than a diameter of at least one of the lenses. The lens unit according to any one of claims 1 to 4,
A vehicle lamp comprising: a light source device that emits light to the lens unit.

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