JPH01257142A - Production of fie for inner lens - Google Patents

Abstract

PURPOSE:To obtain the die for forming inner lenses for rear combination lamps which yields the lamps having an excellent light emitting characteristic, illuminating function, etc., by dividing the above-mentioned die to a central part die, a flat part die and a curved surface part die having a specific shape. CONSTITUTION:The die for forming the inner lens 17 is formed by dividing the die to the central part die 11, the flat part die 13, and the curved surface part die 15. Inscribing parts 12, 14a, 16a, 16b for Fresnel cutting are formed to the respective dies. Further, the curved surface part die 15 consists of molding faces 15a, 15b in the curved surface part thereof, which faces are formed of a part of the body of rotation generated around the optical central axis running a light source 26 for causing the inner lens 17 to be irradiated by the direct light thereof. The inner lens 17 which has the curved surface part 17a, has the shape complying with the contour of a front face lens 21 and is subjected to the Fresnel cutting 23 is produced by using the above-mentioned die. The rear combination lamp is produced by a combination of the front face lens 21 having the curved surface part 21a and the light source 26.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to the production of molds for inner lenses, particularly molds for inner lenses that are used to be incorporated inside rear combination lamps in which tail lamps, direction indicator lamps, side marker lamps, backup lamps, etc. are incorporated together. It is about the method.

[Prior art]

A rear combination lamp incorporating this kind of inner lens has the structure shown in FIGS. 6 to 8. In FIG. 6, numeral 1 indicates a combination lamp, and this lamp has a structure in which, for example, a tail lamp 2 and a direction indicator lamp 3 are incorporated. In such a rear combination lamp, for example, the cross section of the tail lamp 2 is shown in FIG. 7, and the front lens 4 of the lamp has a curved surface portion 4a that extends to the outside of the vehicle body. A flat inner lens 5 having a Fresnel cut is disposed inside the front lens 4, and the inner lens 5 is connected to the front lens 4.
A Fresnel cut is formed along the curved surface portion 4a to the very edge. Therefore, the end edge 5a of the Fresnel cut portion of the inner lens 5 is located on the starting end side of the curved surface portion 4a. Further, in another conventional example shown in FIG. 8, the inner lens 5 is formed by bending a flat plate portion with a Fresnel cut so as to follow the curved surface portion 4a as much as possible.
The bent portion 5b is located on the curved surface portion 4a, and the fold line 5c of the bent portion and its end portion 5d are located approximately in the center from the starting end of the curved surface portion 4a. The same applies to the direction indicator lamp 3.

Problem 1 to be Solved by the Invention In the former configuration of the conventional example, the Fresnel cut portion of the inner lens 5 with respect to the front lens 4 extends to the starting position of the curved surface portion 4a, contributing to the light distribution characteristics in the front lens 4. The effective light emitting surface is limited to the position where the Fresnel cut is made, and the effective light emitting surface is limited to a rather small range compared to the size (width) of the lamp, and the size of the front lens 4 is limited. There is a problem in that it is not possible to utilize the capacity effectively. Further, in the latter configuration, although the effective light emitting surface is expanded to approximately the middle position of the front lens 4 by the bending portion 5b, not only is the size of the front lens 4 still not able to be used effectively; The inner lens 5 on the inside and the bent portion 5b on the outside are separated by the fold line 5C, and the light emitting state in the front lens 4 is different, resulting in an unnatural lighting filling as a lamp. There are also challenges. [Means for Solving the Problems] As a specific means for solving the various problems of the conventional example, the present invention provides a front lens having a shape having a curved portion that wraps around the outside of the vehicle body, and the front lens. An inner lens that has a shape roughly in line with the above and has a Fresnel cut,
In the rear combination lamp including a light source that irradiates direct light to the inner lens, a central part is provided as a mold for forming an inner lens disposed inside the front lens and having a shape that roughly follows the shape of the front lens. A mold is formed separately into a mold, a flat part mold, and a curved part mold, and an engraved part for Fresnel cutting is formed in these eight molds, and the curved part mold has a molding surface of the curved part. provides a method for manufacturing a mold for an inner lens, characterized in that the mold is formed of a part of a rotating body formed around an optical central axis passing through the light source as a rotation center, and the mold is made of three molds. By dividing the lens into two parts, it is possible to form an inner lens with a curved part that wraps around to the outside of the vehicle body, and by making an appropriate Fresnel cut even to the curved part, the entire lamp is Not only does the luminous property improve, but
The lighting function as a lamp will also be improved.

【Example】

Next, the present invention will be explained in more detail based on illustrated embodiments. First, the mold is divided into three molds. In Fig. 1, reference numeral 11 denotes a central mold, and the central mold forms a Fresnel cut at approximately the center of the inner lens. When in use, a groove-shaped engraved portion 12 is formed with the point where the light source is approximately located as the rotation center axis. Reference numeral 13 denotes a flat part mold for forming a Fresnel cut on the left or right side of the inner lens, which has an overall rectangular shape and is disposed adjacent to the central part mold 11, so that the approximately central part is In the same manner as described above, carved portions 14a and 14b are formed on both sides, respectively, with the rotation center axis being the point where the light source is approximately located. The flat part mold 13 is separated by a cut at the portion indicated by the imaginary line a, and used separately as mold parts 13a and 13b. That is, the mold part +3a is used for the right lamp, and the mold part 113b is used for the left lamp. Reference numeral 15 denotes a mold for a curved surface, and the mold has a predetermined optical center axis O that passes through the position of the light source to be installed when used as a lamp and is approximately along the mechanical central axis of the lamp. It is formed by a part of a rotating body (approximately in the shape of a semi-cylindrical fish cake) having a radius R with the position as the center axis of rotation. Therefore, the molding surface of the curved surface portion of the curved surface mold 15 is formed into a part of a rotating body that rotates around the optical center axis, that is, into an arc shape. Fresnel cut engravings 16a, 1 are formed on the rotating body or arc-shaped surface of the curved surface mold 15 excluding the approximate center part.
Gb is also engraved and formed with the optical center axis 0 as the rotation center axis. In this case, all the carved parts formed on the curved surface part have an arcuate shape. The curved surface mold 15 formed in this manner is also separated at each cut point at the imaginary line portion, and the mold portions 15 are separated.
A and 15b are respectively used separately in the same way as the flat part mold 13. The respective mold parts are formed in this way, and when actually molding the inner lens, the molds are assembled as shown in FIG. 2. In other words, the mold part 13a for the flat part and the mold part 1 for the curved surface.
A core X is sandwiched between the core X and the core X, and a central mold 11 is disposed on the outside in correspondence with the core, and is attached with its engraved portion 12 facing inside. Then, mold members YZ are disposed in correspondence with the outsides of the mold part 13a for the flat part and the mold part 15b for the curved surface, respectively, and the molds are assembled. An inner lens 17 having a predetermined curved surface is formed by the mold assembled in this way. The other cut and separated mold part 13b and mold part 15a are used for forming an inner lens for a rear combination lamp installed on the opposite side of the vehicle. Even in this case, the central mold 11 is common. Inner lens 17 formed using such a mold
The curved surface portion 17a is characterized in that it is formed into a curved surface even in a horizontal section passing through the optical central axis, and that the curved surface portion 17a is also provided with a predetermined Fresnel cut. An example of actual use of the inner lens 17 formed in this manner is shown in FIGS. 3 to 5. In the same figure, 18 is a rear combination lamp, and this lamp is composed of a tail lamp 19 and, for example, a direction indicator lamp 20. Front lenses 21 and 22 are disposed in front of each lamp, and inside them, Inner lenses 17 having substantially the same shape are provided. Therefore,
To explain about one tail lamp 19, as shown in FIG. A structure in which a curved surface portion 17a (basically a curved line along the shape of the front lens 21) formed of a free curve that wraps around the front lens 21 is integrally formed is used. The inner lens 17 has the curved surface portion 17a.
A Fresnel cut 23 is applied to the entire body, including. In particular, in the figure, the Fresnel cut 23a at the center is made on the front side by the carved part 12 of the central mold 11, and the Fresnel cut 23b on the left side is made by the mold part 1 of the flat mold 13.
3a, and the curved part Fresnel cut 2
3c are formed inside by the mold portions 15b of the curved mold 15, respectively. Another example shown in FIG. 5 uses a front lens 21 without a lens cut, and an inner lens 17 disposed inside is provided with a lens cut 24 corresponding to the lens cut of the front lens. is used. In this case, all the Fresnel cuts 23 in the inner lens are made on the inside, but as mentioned above, the mold is divided into three parts, and these parts are combined to form the inner lens 1.
Fresnel cuts can be freely formed inside or outside of 1. In any case, the inner lens disposed on the inside has a curved surface portion corresponding to the front lens on the outside, and the curved surface portion is also subjected to a Fresnel cut. still,
In the figure, 25 is a housing, and 26 is a light source.

【Effect of the invention】

As explained above, the method for manufacturing a mold for an inner lens according to the present invention includes a front lens having a shape having a curved surface portion that wraps around toward the outside of the vehicle body, and a Fresnel cutter 1 to 1 having a shape that roughly follows the front lens. In a rear combination lamp, the rear combination lamp is equipped with an inner lens provided with an inner lens and a light source that directs light to the inner lens, the inner lens being disposed inside the front lens and having a shape that roughly follows the shape of the front lens. The mold for forming the mold is divided into a central part mold, a flat part mold, and a curved part mold, and an engraved part for Fresnel cutting is formed on these alloy molds. The shape of the inner lens can be matched to the shape of the front lens by configuring the mold so that the molding surface of the curved part is formed by a part of a rotating body that rotates around the optical center axis passing through the light source. It can be formed by
Appropriate Fresnel cuts can now be made on curved surfaces that wrap around outward, so when incorporated into a rear combination lamp and used, the Fresnel cut does not suddenly break off like in the past, and fold lines are exposed. The light is emitted evenly across the entire front lens without any
Since the effective light emitting surface that contributes to the light distribution characteristics is significantly enlarged, the visibility of the lamp is improved, which is an excellent effect. In addition, by using a mold that is divided into three parts, six (6) Fresnel cuts are formed on the inner lens in the center and on the left and right, and the left and right Fresnel cuts and the center Fresnel cut are Since it was made to be formed separately into the inside and outside,
Not only can the brightness change in the light distribution characteristic be changed in a natural manner, but also has the excellent effect of improving the external design and product value because fold lines etc. are not seen through when the light is not lit. Furthermore, it is possible to use an uncut lens for the front lens, a Fresnel cut for the inner lens, and a cut corresponding to the front lens cut for the non-cut lens, giving the lamp a sense of depth and luxury as a whole. This also has the additional effect of reducing the product 1i11i value.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing each part separated to explain the forming process of a mold for forming an inner lens according to the present invention, and Fig. 2 is a schematic diagram showing the assembled state of the mold. 3 is a partially cutaway front view of a rear combination lamp showing an example of the use of an inner lens formed with the same mold, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. 5 is a sectional view similar to FIG. 4 of another example formed using the same mold, FIG. 6 is a schematic front view of a rear combination lamp of a conventional example, and FIG. FIG. 6 is a cross-sectional view taken along the line Vl-■, and FIG. 8 is a cross-sectional view of a conventional example of the blade. 11...Central part mold 12.14a, 14b, i6a 116b ・=-Engraving part 13...Flat part mold 13a, 13b...Flat part mold Mold part 15・
......Curved surface part mold 15a, 15b...Mold part 17 of the curved part mold.
... Inner lens 17a121a ... Curved portion 18 ... Rear combination lamp 19 ...
...Stop & tail lamp 20...Direction indicator lamp 21.22...Front lens 23.23a, 23b, 23'C...Fresnel cut 24...Lens Cut 25...Housing 26...Light source O/Old...
Optical axis patent applicant Honda Motor Co., Ltd. Stanley Electric Co., Ltd. Figure 1 Figure 2 Figure 3 2'3C Fifth factor

Claims (3)

[Claims] (1) Direct light is irradiated to a front lens having a shape that has a curved surface that wraps around the outside of the vehicle body, an inner lens that has a shape that roughly follows the front lens and has a Fresnel cut, and the inner lens. In a rear combination lamp equipped with a light source, a mold for forming an inner lens disposed inside the front lens and having a shape that roughly follows the shape of the front lens includes a central mold and a flat mold. , and a curved surface mold, and each of these molds is formed with an engraved part for Fresnel cutting, and the curved surface mold has a molding surface of the curved surface that is located at the optical center passing through the light source. A method for manufacturing a mold for an inner lens, characterized in that the mold is formed from a part of a rotating body that rotates around an axis. (2) Claim (1) wherein the flat part mold and the curved part mold are formed symmetrically, cut and separated at predetermined positions, and used as molds for inner lenses of left and right lamps.
) A method for manufacturing a mold for an inner lens described in the method. (3) The inner lens mold according to claim 1, wherein the Fresnel cut engraved portion engraved on the curved surface portion of the curved surface portion mold is also formed in an arc shape with the optical central axis as a rotation center. manufacturing method.