JP2732341B2 - Front lens for lamps and method of painting the front lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for coating a front lens for a lamp such as a sign light of an automobile, and more particularly to a front lens for a lamp which is coated without masking and a method of coating the front lens.

[0002]

2. Description of the Related Art Conventionally, when a structural or design line or pattern is drawn on the front lens surface of a vehicle marker light,
Generally, spray coating is performed. However, in the case of this type of lens coating, the light emission color of the lamp changes when light passes through the colored coating, so that it is necessary to make the coating film thicker. However, when the coating film becomes thicker, there is a problem that the coating drips. Was.

Therefore, a parting structure for preventing the paint from dripping at the time of painting is required. As shown in FIG. 8, a mask partitioning step 51 is formed on the surface of the front lens 50 as a pretreatment for painting. A masking 52 is applied to the stepped portion 51 or, as shown in FIG. 9, a parting uneven portion 53 is formed at a corresponding position on the surface of the front lens 50 to be coated in advance, and then a predetermined coating is performed by a nozzle 54. However, in the above-mentioned spray coating, thin line drawing cannot be performed, and a fine line drawing pattern cannot be drawn. Therefore, conventionally, a dedicated line drawing device such as a dispenser had to be used.

[0004]

In addition, in the above-mentioned coating method for applying the masking 52 or forming the parting projections 53, the step part 51 for mask partitioning and the parting part for the parting on the surface of the front lens 50 are provided. It is necessary to form the concave and convex portions 52 at the time of molding the front lens 50, which not only requires processing into a lens molding die, but also changes the coating range and pattern when the molding die itself is changed. Is necessary, it is extremely difficult to change the coating conditions, and if the above-described step 51 for partitioning the mask and the uneven portion 53 for parting are formed on the surface of the front lens 50,
There is a problem that light from a light source and external light emitted from inside the lamp are irregularly reflected at the portion to generate harmful light as a lamp. For this reason, an inkjet printing method that does not require the formation of a step for mask partitioning or an uneven part for parting has been considered as a new method of painting a front lens.However, since it is extremely difficult to prepare a paint, it has been implemented. The fact is that it has not been done.

The present invention has been made in view of the above-mentioned problems, and does not require the use of a special coating apparatus such as a special-purpose coating apparatus, does not require masking, and allows the paint to be drawn. It is an object of the present invention to provide a front lens for a lamp that is painted in a shape and drawn and painted, and proposes a method of coating a front lens that can be drawn and painted on the front lens of the lamp.

[0006]

In order to achieve the above-mentioned object, a front lens for a lamp according to the present invention has a coating layer formed on a surface thereof and blocks a part of a transmitted light beam to constitute a structural line. In the front lens, the paint layer of the front lens is formed by applying a coating of an acrylic resin paint and carbon particles kneaded such that the thickness of the paint layer is 20 to 50 μm. is there.

[0007] A method of coating a front lens for a lamp includes a step of coating a front lens of a lamp which forms a structural line by forming a paint layer on a surface and blocking a part of a transmitted light beam.
On the application surface of the front lens, a paint in which carbon particles are mixed with an acrylic resin paint is applied in the form of dots, and a coating layer having a thickness of 20 to 50 μm is formed by the dot-like coating assembly. Things.

[0008]

According to the above-mentioned coating method, the painting method is performed by using a marking device used for printing numerals, symbols, etc. instead of the conventional method of drawing with a dispenser or the like. Fine lines can be formed with certain print clarity. In addition, since lines are drawn using a marking device used to print numbers, symbols, etc., even painted products that used to have parting lines using an electroformed mask can be used without a mask. It can be painted in black, gray, metallic, etc. Further, using a marking device used for printing numbers, symbols, etc., 1.0 to 2.
Since a dot of 5 mm is formed by drawing, gradation coating can be performed by changing the dot density.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A front lens for a lamp according to the present invention and a method of coating the front lens will be described below with reference to the drawings.
Investigation of a printing system that can use the currently used one-pack acrylic lacquer type resin coating as a maskless coating method revealed that Marktec's printing method (hereinafter referred to as "Techmarker method coating") could be used. As a result, a coating method was devised with the following configuration.

FIG. 1A is a conceptual diagram of a tech marker type coating according to the present invention, in which a nozzle head 2 is three-dimensionally displaced relative to a front lens 1 of an automobile which is a lens (work) to be coated. The paint is applied to form the paint layer 3. The thickness of the paint layer 3 is set to 20 to 50 μm. That is, when the film thickness is 20 μm or less, the surface color of the front lens 1 is seen through the paint layer 3, and when the film thickness is 50 μm or more, the drying speed between the inside and the surface of the paint layer 3 is different. The paint is easily peeled off. As shown in FIG. 2, the nozzle head 2 has a paint pressurizing supply port 4 communicating with a nozzle 9 and a nozzle seal 5 formed of a hard sphere in a communication passage.
And the nozzle seal 5 is arranged via a needle 7 in a coil 8 which causes low frequency vibration.

In the coating by the nozzle head 2, the paint is discharged in a dot state from the nozzle 3, and the dot pitch is shortened as shown in FIG. 1B to draw a line. At this time, the thickness of the paint layer 3 can be formed in the range of 20 to 50 μm as described above.

As shown in FIG. 2, this nozzle head 2
Is a nozzle seal 5 using a carbide ball to open and close the nozzle 9
Therefore, when the paint is discharged from the nozzle 9 while being pressurized, the opening / closing accuracy is improved and the nozzle is discharged in a fixed direction with less clogging of the nozzle due to leakage. Needle 7
Because a low frequency pulse (which was conventionally operated by a solenoid valve) is sent to the coil 8 to open and close the coil 8 and vibrate,
The precision of the nozzle seal is improved, and the fixed amount discharge is possible.
Further, since the discharged paint has a structure that does not include air, the paint is less scattered.

As the coating conditions for the nozzle head 2, a one-pack acrylic lacquer type resin coating can be used. The coating accuracy changes depending on the setting of conditions such as the feed speed of the nozzle head 2 with respect to the work (front lens 1) and the pressure of the supplied paint, and affects the appearance of the coating.

In order to draw a line, the drawing conditions such as pressure, speed, nozzle height and the like are sufficiently studied and set.
You can draw clear lines. In this test, the feed speed is 17 mm because a line is drawn by dot collection.
/ Sec, but mass production can be realized in the future by improving the speed. In addition, the tec marker type coating is inferior to the spray coating in the number of coating steps, but has an advantage that the spray coating does not have in the surrounding environment and the degree of freedom of design.

FIG. 3 is a block diagram of a coating apparatus for mass production used in the method for coating a front lens for a lamp according to the present invention, and FIG. 4 shows a specific embodiment. The nozzle head 2 is attached to a driving end of a five-axis robot 10, and is controlled by a personal computer 12 so as to displace the nozzle head 2 along a coating position of the work 1 fixed to a work mounting jig 11. The driving of the robot 10 is controlled by a signal via the drive unit 13.
In addition, the paint pressure supply port 4 and a print control device 15 are connected to the nozzle head 2 via a paint hose 14, and
The opening and closing of the nozzle seal 5 is controlled.

Using the above-described coating apparatus, a wire drawing 21 (see FIG. 5), an exterior coating 22 (see FIG. 6), an inner dummy coating 23 (see FIG. 7), and the like can be applied to the surface of the front lens 1. . According to the coating apparatus according to the present invention, the wire drawing 21 can be expected to have an extremely large effect as compared with the exterior coating 22 and the inner surface dummy coating 23, but it does not form on the masking or the parting-off irregularities. When the superiority and the degree of freedom of design are considered, the exterior coating 23 and the inner dummy coating 23 for the front lens 1 of the lamp are extremely useful.

That is, in the above-mentioned coating method, since drawing is performed by a set of dots, a line drawing can be performed by continuously applying dots so as to overlap one-dimensionally. The line width is determined by the dot diameter. Further, by continuously applying the dots in a two-dimensional direction so as to overlap with each other and performing surface coating, the edges of the surface coating are also drawn by dot coating, so that there is no need to perform a parting process such as masking, and individual Can be set arbitrarily, so that a coating process can be applied to a three-dimensional curved surface or a painted surface having a step. Further, when the coating is performed using the above-described dot group, an arbitrary gradation pattern can be formed on the painted surface by changing the density of the dot group.

[0018]

According to the front lens for a lighting device and the method of coating the front lens according to the present invention, a paint in which carbon particles are kneaded from a nozzle is discharged in a dot shape onto a surface to be coated as described above, and the dot is formed. By adopting a configuration in which lines are drawn by continuation of columns, a relatively thick coating film of about 20 to 50 μm can be formed without performing pretreatment such as masking for preventing paint dripping. Therefore, the lens color on the front lens surface is not seen through the paint layer, and the coating film does not peel off. In addition, since the surface of the front lens does not need to be formed with irregularities, not only is it easy to change or correct the coating conditions such as the coating range and the pattern, but also it is possible to prevent the generation of harmful light emitted from the front lens. In addition, the effect obtained by implementing the present invention is extremely large, for example, it is possible to easily draw a thin line which has been difficult on the front lens of the lamp.

[Brief description of the drawings]

FIG. 1A is a conceptual diagram showing a tech marker type coating according to the present invention, and FIG. 1B is an explanatory diagram showing a dot pitch from a nozzle and a drawing state.

FIG. 2 is a front view showing the structure of a nozzle head.

FIG. 3 is a block diagram of a coating apparatus for mass production used in the method for coating a front lens for a lamp according to the present invention.

FIG. 4 is a perspective view showing the specific example.

FIG. 5 is a perspective view of a work which has been subjected to drawing painting.

FIG. 6 is a perspective view of a workpiece on which exterior coating is performed.

FIG. 7 is a perspective view of a work on which an inner surface dummy coating is applied.

FIG. 8 is a perspective view showing a masking state used in a conventional coating method.

FIG. 9 is a perspective view showing a coating method for the front lens surface on which the parting unevenness is formed.

[Explanation of symbols]

 Reference Signs List 1 work (front lens) 2 nozzle head 3 paint layer 4 paint pressurization supply port 5 nozzle seal 7 needle 8 coil 9 nozzle 10 robot 11 work mounting jig 12 personal computer 13 drive unit 15 print control device 21 drawing coating 22 exterior coating 23 Inside dummy coating

Claims (2)

(57) [Claims] 1. A front lens of a lamp which forms a structural line by forming a paint layer on the surface and blocking a part of a transmitted light beam, wherein the paint layer of the front lens is obtained by kneading carbon particles into an acrylic resin paint. Depending on the paint, the thickness of the paint layer is 20 to
A front lens for a lamp, which is coated so as to have a thickness of 50 μm. 2. In a coating process of a front lens of a lamp which forms a structural line by forming a paint layer on a surface and blocking a part of a transmitted light beam, an acrylic resin paint and carbon particles are applied to a coating surface of the front lens. A method for coating a front lens for a lamp, comprising applying a paint mixed with a paint in the form of dots, and forming a paint layer having a film thickness of 20 to 50 μm by the dot-like coating assembly.