JP2008177054A - Lens cover of vehicle lamp, and vehicle lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens cover for a vehicle lamp which can easily change a lamp having no freezing prevention function into a lamp 10 with freezing prevention function, and to provide a vehicle lamp. <P>SOLUTION: A lens cover 5 is used which has a transparent cover case 51 that can be post-installed on an outer lens 7 installed on a lamp housing 6 covering the front aperture of the lamp housing 6 with a light source 9 built in and is installed to cover the outer lens 7 and a resistance heating element 17 as a heater which is wired on the inner face of the lens cover case 51 opposed to the outer lens 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens cover for a vehicle lamp and a vehicle lamp, and in particular, a freezing that can easily and quickly melt snow that has poured onto the lens outer surface of the lamp and frozen snow in a snowfall area. The present invention relates to a lens cover for a vehicular lamp of a prevention type and a vehicular lamp.

  Conventionally, a freeze prevention type vehicular lamp in which a heater is incorporated in an outer lens for the purpose of melting snow adhering to the outer lens or eliminating fogging of the outer lens is known (see, for example, Patent Document 1). ).

The vehicular lamp described in Patent Document 1 has a resistance heating element wired on the back surface of the outer lens in the lamp, warms the outer lens by the heat generated by the resistance heating element, and melts frozen snow or the like on the outer surface of the outer lens. It is.
JP 2006-302604 A

  However, in the prior art disclosed in Patent Document 1 and the like, a resistance heating element is wired on the inner surface of the outer lens and integrated with the lamp. Therefore, a lamp that does not have a freeze prevention function is replaced with a lamp with a freeze prevention function. When we wanted to change the lamp, it was necessary to replace the lamp itself, which was an economic burden.

  Further, the resistance heating element is always used in a state where it is provided on the inner surface of the outer lens, regardless of whether the resistance heating element is energized. However, because the light source is an incandescent bulb, the heat generated by lighting the bulb also warms the outer lens and contributes to snow melting, etc., but the resistance wired on the inner surface of the outer lens is affected by the heat generated by lighting this bulb. The heating element is easily peeled off. In particular, since the temperature is high in the summer, this influence is large and the durability is inferior.

  The present invention has been made in view of the above circumstances, and an object of the present invention is for a vehicle in which a lamp that does not have a freeze prevention function can be easily changed to a lamp with a freeze prevention function. The object is to provide a lens cover for a lamp and a vehicular lamp.

  In order to solve the above-described problems, the lens cover of the vehicle lamp according to the present invention is attached to the vehicle lamp in which an outer lens is assembled to the front opening of the lamp housing with a built-in light source. A cover cover made of a transparent resin that can be retrofitted by covering the effective lens portion of the outer lens through which light from the light source is transmitted, and the effective lens portion on the inner surface of the cover housing. And a resistance heating element for the heater wired so as to face each other.

  According to this configuration, when a current is passed through the resistance heating element for the heater wired on the inner surface of the lens cover, the entire lens cover is heated. Therefore, even if it is a lamp that does not have a freeze prevention function, if a lens cover is attached later, a current will flow through the resistance heating element when snow falls on the outer surface of the lens cover or freezes. It can be easily melted by raising the temperature of the lens cover. Thereby, the effective lens part which the light from a light source permeate | transmits can be hold | maintained in the state which can always be seen from the exterior through a lens cover. That is, even a lamp that does not have a freeze prevention function can be changed to a lamp that has a freeze prevention function by simply attaching a lens cover later without replacing the entire lamp.

  Further, when the anti-freezing function is not necessary except during the winter season, if the lens cover is removed and stored, the influence of peeling off of the resistance heating element due to heat generated by lighting of the bulb can be reduced.

  Furthermore, if it is a colorless and transparent lens cover, it can be used for headlamps, and any combination lamp that combines and integrates stop lamps, turn signal lamps, back lamps, etc. with different colors for each lens. It can also be used for other lamp parts, improving versatility and enabling small-scale mass production.

  The lens cover may have a mounting hole that coincides with a hole for fixing the lamp housing and the outer lens.

  According to this configuration, after once removing the mounting screw that fixes the lamp housing and the outer lens, the lens cover is disposed so as to cover the effective lens portion of the outer lens, and then the mounting screw is attached to the mounting hole of the lens cover. When tightened to the hole of the lamp housing through the hole of the outer lens, the lens cover can be attached to the outer lens without newly providing a mounting hole.

  The lens cover may be attached with a waterproof packing disposed between an inner surface outside the region where the resistance heating element is wired and an outer surface of the outer lens.

  According to this configuration, by providing a waterproof packing between the inner surface of the lens cover and the outer surface of the outer lens, and attaching the lens cover, it is possible that snow melting water or the like flows from the upper direction between the lens cover and the outer lens. Can be prevented.

  The lens cover is formed such that an inner surface of a region in which the resistance heating element is wired is protruded to the outer lens side with respect to an inner surface of an outer peripheral region located outside the region. The inner surface of the region where the heating element is wired is attached closer to the outer surface of the outer lens portion than the inner surface of the outer peripheral region.

According to this configuration, since the inner surface of the region where the resistance heating element is provided is attached close to the outer lens, in addition to the temperature rise due to the heat generation of the resistance heating element, the incandescent lamp in the lamp housing is attached. The heat radiated from the bulb or the like is well absorbed and the temperature rises easily. In addition, the volume of the space between the lens cover and the outer lens is reduced, and the entire space can be rapidly heated.
A vehicle lamp according to the present invention includes a container-shaped lamp housing, a light source provided in the lamp housing, an outer lens assembled in a front opening of the lamp housing, and the vehicle lamp according to any one of the above. Lens cover.

  According to this configuration, when a current is passed through the resistance heating element wired on the inner surface of the lens cover, the entire lens cover is heated. Therefore, when the lens cover is attached, when the snow falls on the outer surface of the lens cover or freezes, the lens cover can be easily melted by passing a current through the resistance heating element to raise the temperature of the lens cover. Thereby, the effective lens part which the light from a light source permeate | transmits can be hold | maintained in the state which can always be seen from the exterior through a lens cover. In other words, when the anti-freezing function is required, the lens cover is attached. When the anti-freezing function is not required, such as in winter, removing the lens cover will affect the resistance heating element due to heat generated by the bulb lighting. A vehicular lamp with a small amount can be obtained.

  Furthermore, if the lens cover is made colorless and transparent, it can be used for headlamps and any lamp part of a combination lamp integrated with a combination of stop lamps, turn signal lamps, back lamps, etc. with different colors for each lens. If the shape of the outer lens is unified, the same lens cover can be used for various lamps, and small-scale mass production becomes possible.

  According to the present invention, by attaching a transparent lens, it is possible to easily change to a lamp with a freeze prevention function without replacing the entire lamp, so that the economy is improved.

  Further, when the anti-freezing function is not required except in winter, the lens cover can be removed and stored, so that the resistance heating element can be prevented from being deteriorated and the life can be improved.

  Furthermore, if it is a colorless and transparent lens cover, it can be used for headlamps, and any combination lamp that combines and integrates stop lamps, turn signal lamps, back lamps, etc. with different colors for each lens. It can also be used for other lamp parts, improving versatility and enabling small-scale mass production. As a result, the cost can be reduced and it can be provided at a low cost.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.

  1 and 2 are front views of a rear combination lamp shown as an embodiment of a vehicular lamp to which the present invention is applied, FIG. 2 is an enlarged sectional view taken along the line AA in FIG. 1, and FIG. It is an expanded sectional view which follows a BB line.

  1 to 3, the rear combination lamp 1 includes a plurality of function lamps, in this example, a stop lamp 2 that is lit red in response to a stepping operation of a brake disposed in the center, and a side of one of the lamps. The turn signal lamp 3 that blinks in yellow according to the arranged direction instruction operation and the back lamp 4 that lights in white according to the reverse operation of the vehicle arranged on the other side are combined. A colorless and transparent cover 5 (hereinafter referred to as “lens cover 5”) is attached to the front surfaces of the lamps 2 to 4 so as to cover the entire front surface.

  The rear combination lamp 1 includes a lamp housing 6 made of a synthetic resin having a container shape in which the inside is divided into three and the front surface is opened, and an outer lens attached with the front opening portion of the lamp housing 6 closed. 7 defines three lamp chambers 8, 8, and 8 for a stop lamp, a turn signal lamp, and a back lamp. As shown in FIG. 2, a light source 9 such as an incandescent bulb and a reflector 10 are disposed in each lamp chamber 8, 8, 8.

  The outer lens 7 is formed as a single lens in which the lenses corresponding to the lamps 2 to 4 are arranged in each part corresponding to the parts of the stop lamp 2, the turn signal lamp 3 and the back lamp 4. Yes. The outer lens 7 has effective lens portions 7A, 7A, and 7A each having a substantially square front view projecting forward for each of the lamps 2 to 4, and each projecting effective lens portion 7A. , 7A, 7A, the lens cover 5 can be attached to cover the entire outside of the effective lens portion 7A. 1 and 2 show a state in which the lens cover 5 is mounted on the effective lens portion 7A of each of the lamps 2-3.

  As shown in FIG. 3, the lens cover 5 shown in FIGS. 1 and 2 has a plurality (four in this example) of mounting holes 13 that coincide with the mounting holes 11 of the outer lens 7 and the screw holes 12 of the lamp housing 6. It is fixed to the effective lens portion 7A by an attachment screw 14 that passes through the attachment hole 13 and the attachment hole 11 in this order and is screwed to the screw hole 12. The lamp housing 56 screw hole 12 and the attachment hole 11 of the outer lens 7 also serve as a hole for fixing the lamp housing 6 and the outer lens 7 with the attachment screw 14 when the lens cover 5 is not attached to the rear combination lamp 1. .

  4 to 11 show the lens cover 5. FIG. 4 is a front view thereof, FIG. 5 is a side view thereof, FIG. 6 is a rear view thereof, FIG. 7 is a bottom view thereof, and FIG. 9 is a cross-sectional view taken along line D-D in FIG. 4, FIG. 10 is a cross-sectional view taken along line EE in FIG. 4, and FIG. 11 is a cross-sectional view taken along line FF in FIG. FIG.

  4 to 11, a lens cover 5 is formed of a colorless and transparent synthetic resin material, for example, acrylic resin, PC (polycarbonate) or the like, and a cover main body 5a having a substantially square front view, and the cover main body. A cover housing 51 formed in a thin container shape integrally having a side surface portion 5b projecting in a wall shape from the four sides of the portion 5a toward the rear and having a receiving recess 5A on the back surface side. Have. In the receiving recess 5A of the lens cover 5, the effective lens portion 7A can be received so as to be entirely covered by the lens cover 5. In the receiving state, the inner surface of the side surface portion 5b is effective as shown in FIG. The lens unit 7A is brought into a loose contact or extremely close to the side surface.

  As shown in FIG. 6, a strip-shaped resistance heating element 17 as a heater is wired on the back surface of the cover main body 5a. Further, a connector disposing portion 19 formed in a bag shape is formed integrally with the cover main body portion 5a so as to protrude outward from the front surface gradually toward the lower end side at the center portion of the lower end of the cover main body portion 5a. ing. A connector portion 18 of the resistance heating element 17 is disposed in the connector placement portion 19, and a through hole 21 through which the harness 20 is passed is provided on the lower surface of the connector placement portion 19.

  The cover body 5a has a front part 15 which is an area where the resistance heating element 17 is wired, and a rear part (inside) an outer peripheral part 16 which is an area located outside the front part (area) 15. It is indented as seen from the front side. When the effective lens portion 7A is received in the receiving concave portion 5A, the inner surface of the front portion 15 is set to be in a state of being very close to or in contact with the outer surface of the effective lens portion 7A. In addition, the four attachment holes 13 are provided in the outer peripheral portion 16 of the cover main body portion 5a so as to correspond to the attachment holes 1 on the outer lens 7 side.

  As shown in FIGS. 4 and 6, the resistance heating element 17 is provided in a zigzag manner on the inner surface of the front portion 15 of the lens cover 5 with a predetermined interval, and both ends are attached to the connector arrangement portion 19. The connector portions 18 are electrically connected to each other. The resistance heating element 17 is heated up to a predetermined temperature when energized, and is configured as a heating resistance. As the resistance heating element 17, a conductive paste such as manganin (copper-manganese alloy) resistance metal or nichrome (nickel-chromium alloy) resistance metal is used, and this is applied or printed as a line having a width of 20 to 80 μm. Wiring with. Further, the resistance heating element 17 may be formed by wiring a copper wire or a tungsten wire. The interval between the resistance heating elements 17 is an interval that does not hinder the use of the signal lamp as illumination, and specifically, about 5 mm is appropriate.

  As shown in FIGS. 1 and 2, the harness 20 is attached through the through hole 21 of the connector placement portion 19, and the resistance heating element 17 within the connector placement portion 19 is provided on one end side. The connector portion 18 is connected to the connector portion 18, and a connector 24 electrically connected to the vehicle-side power source is provided on the other end portion side. Normally, the connector 22 is handled in a state of being connected to the connector portion 18.

  The lens cover 5 configured in this way can be attached to the rear combination lamp 1 later. Of course, it may be attached to the rear combination lamp 1 from the beginning, but in this example, as a case where it is attached later, the attachment method will be described below. When the lens cover 5 is attached to the combination lamp 1 later, first, all the attaching screws 14 that fix the lamp housing 6 and the outer lens 7 are removed. Thereafter, as shown in FIG. 2, the lens cover 5 is placed on the effective lens portion 7 </ b> A with a seal packing 25 interposed between the inner surface of the outer peripheral portion 16 of the lens cover 5 and the front surface of the effective lens portion 7 </ b> A. Thus, the entire outer shape of the effective lens portion 7A is received in the receiving recess 5A and covered with the lens cover 5.

  Next, when the mounting screw 14 is passed through the mounting hole 13 and the mounting hole 11 in order and screwed into the screw hole 12 of the lamp housing 6 and tightened to all portions where the mounting screw 14 has been removed in the previous operation, The lamp housing 6, the outer lens 7, and the lens cover 5 are integrally fastened and fixed, and the lens cover 5 is attached to the effective lens portion 7A. Further, by tightening the mounting screw 14, the seal packing 25 interposed between the lens cover 5 and the effective lens portion 7 </ b> A is compressed to enhance the sealing performance, so that snow water or the like melted from above the lens cover 5 does not enter. Sealed. When this operation is performed for all the lamps 2 to 4, the rear construction lamp 1 having the lens cover 5 as shown in FIG. 1 is obtained.

  Thereafter, when the connector 24 attached to the other end of the harness 20 pulled out from the lens cover 5 is connected to a power source on the vehicle body side (not shown) via a control circuit, the resistance heating element 17 is connected from the vehicle side to the resistance heating element 17. Energization can be controlled. That is, when a current from the power source is passed through the resistance heating element 17, the resistance heating element 17 is heated to a predetermined temperature, the entire lens cover 5 is warmed, and snow frozen on the outer surface of the lens cover 5 is melted. The effective lens portion 7A of the lamps 2 to 4 can be viewed from the outside through the cover 5, and can be changed to a rear combination lamp 1 with a so-called freeze prevention function.

  Moreover, in the structure of this embodiment, since the inner surface of the region (front portion 15) provided with the resistance heating element 17 is attached close to the outer surface of the effective lens portion 7A, the approaching front surface. In addition to the temperature rise caused by the heat generated by the resistance heating element 17, the portion 15 absorbs heat radiated from the light source 9 such as an incandescent bulb in the lamp housing 6, which promotes the temperature rise and is effective with the lens cover 5. The volume of the space between the lens unit 7A is also reduced, and the entire space is rapidly warmed to promote the temperature rise effect.

  On the other hand, when the winter season has passed and the anti-freezing function is no longer required, the lens cover 5 can be removed from the rear combination lamp 1 by processing in the reverse work procedure, thereby removing the lens cover 5. It is possible to return to the rear combination lamp 1 that is not mounted.

  The preferred embodiments of the present invention have been described above. However, the present invention can be variously modified and changed without departing from the concept of the claims.

  For example, in the above embodiment, the configuration is applied to the rear combination 1, but it can also be applied to a vehicle lamp such as a front combination lamp or a headlamp. Therefore, when applied to a combination lamp, the lens cover 5 is attached to the effective lens portion 7A of the outer lens 7 described in the above embodiment, and when applied to a single headlamp or the like, covers the entire outer lens. Install.

  In the above embodiment, the lens cover 5 is mounted using the mounting hole 11 and the screw hole 12 for fixing the lamp housing 6 and the outer lens 7, but the lens cover 5 is attached to the outer lens 7 on both sides. You may make it attach by adhere | attaching with an adhesive tape etc.

  The lens cover 5 is not only provided in the state where it is attached to the lamp from the beginning, but is also supplied as a single unit for retrofitting already sold vehicle lamps that do not have a freeze prevention function. Is also possible.

It is a schematic front view of the rear combination lamp to which the present invention is applied. It is an expanded sectional view which follows the AA line of FIG. It is an expanded sectional view which follows the BB line of FIG. It is a front view of the lens cover shown in FIG.1 and FIG.2. It is a side view of a lens cover same as the above. It is a rear view of a lens cover same as the above. It is a bottom view of a lens cover same as the above. It is an expanded sectional view which follows the CC line of FIG. It is an expanded sectional view which follows the DD line of FIG. It is an expanded sectional view which follows the EE line of FIG. It is an expanded sectional view which follows the FF line of FIG.

Explanation of symbols

1 Rear combination lamp (vehicle lamp)
5 Lens cover 6 Lamp housing 7 Outer lens 7A Effective lens portion 8 Lamp chamber 9 Light source 11 Mounting hole 12 Screw hole 13 Mounting hole 14 Mounting screw 15 Outer peripheral part 16 Front part 17 Resistance heating element 25 Seal packing

Claims (5)

A lens cover for a vehicle lamp that can be attached to a vehicle lamp in which an outer lens is assembled by closing the front opening at a front opening of a lamp housing that incorporates a light source,
A cover housing made of transparent resin that covers the effective lens portion of the outer lens through which light from the light source passes and can be retrofitted, and a heater wired on the inner surface of the cover housing so as to face the effective lens portion A lens cover for a vehicular lamp, comprising a resistance heating element for use in a vehicle.   2. The lens cover for a vehicle lamp according to claim 1, wherein the lens cover has a mounting hole that matches a hole for fixing the lamp housing and the outer lens.   3. The lens cover according to claim 1, wherein a waterproof packing is disposed between an outer inner surface of a region where the resistance heating element is wired and an outer surface of the outer lens. Lens cover for vehicle lamps.   The lens cover is formed such that an inner surface of a region in which the resistance heating element is wired is protruded to the outer lens side with respect to an inner surface of an outer peripheral region located outside the region. 4. The vehicle according to claim 1, wherein an inner surface of a region where the heating element is wired is attached closer to an outer surface of the outer lens portion than an inner surface of the outer peripheral region. 5. Lens cover for lamp. A container-shaped lamp housing;
A light source provided in the lamp housing;
An outer lens assembled in the front opening of the lamp housing;
A vehicle lamp comprising: the lens cover of the vehicle lamp according to any one of claims 1 to 4.

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