JP2005183191A - Vehicular lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a visual light checking filter is detachably attached around a lighting fixture so as to use the lighting fixture as both a visual lighting fixture and an infrared projector, a backlash develops to generate an abnormal sound and even a breakage due to a big difference in thermal expansion between the filter and holding members. <P>SOLUTION: According to the present invention, the filter 4 is held in both thickness direction and length directions by a driving arm 5. In the thickness direction, a bearing surface 5a, and a first spring 6 supports the filter 4. The bearing surface 5a supports it at at least 2 points each of right and left sides along the axis direction, which is assumed to lie on an outer surface of a cylindrical carrier 4a. The first spring 6 presses and sandwiches the positions supported by the bearing surface from the inside of the cylinder. In the length direction, the filter 4 is supported by projections 7a for contacting and supporting one end of the carrier 4a, and a second spring 7 for pressing the filter 4 from an opposite end towards the projections. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicular lamp such as a headlamp, and more specifically, an infrared filter that transmits infrared light to a light source of a vehicular lamp such as a halogen bulb and shields visible light is detachably provided. The present invention relates to a vehicular lamp that is used as a visible light lamp such as a headlamp when the outer filter is removed and is used as a projector for an infrared night vision device (night vision) when the outer filter is attached.

  In recent years, in most cases, it is normal to travel with a low light distribution at night, except when driving on places with few opportunities to encounter oncoming vehicles such as highways and suburbs. In this case, since it is difficult to identify obstacles and pedestrians that are present in the distance, the use of an infrared night vision device (night vision) that does not cause illusion to oncoming vehicles is proposed and put into practical use. It is coming.

  Thus, when adopting an infrared night vision device, an infrared projector is required, and as a configuration of the projector at that time, for example, a method of adopting a light source that emits only infrared light, such as an infrared light emitting diode, and the like Any one of the methods of combining an infrared transmission filter with a light source that emits infrared light and visible light, such as a halogen light bulb, and cutting the unnecessary visible light part to obtain only infrared light is employed.

  Here, in the method using an incandescent bulb or a halogen bulb and an infrared filter, visible light is obtained from the light source at a position where the infrared filter is not attached. That is, visible light is used as a lamp. Since it is possible to have a part to project and a part to project infrared rays, an infrared filter is provided in part of the light source of incandescent bulbs and halogen bulbs so that both visible light fixtures and infrared projectors can be used. What has been proposed.

In this case, the vehicular lamp is formed with a light distribution characteristic similar to a so-called light distribution for traveling that generates irradiation light toward the front direction of the vehicle, and an infrared filter is applied to a portion that irradiates the front direction. It is assumed that only infrared light is radiated and visible light is irradiated in front of the vehicle, so that the portion near the vehicle is visually checked for obstacles by visible light, The distant portion is irradiated with infrared light, and the distant portion is confirmed by a night vision device so that the oncoming vehicle is not dazzled.
JP 2002-135629 A

  In addition, as described above, as another method when using both a visible light lamp and an infrared projector, in recent years, when traveling normally at night, a passing light distribution is used. Since the lamp for light distribution is hardly used, as shown in FIG. 7, an infrared filter 92 that transmits infrared light to the light source 91 is detachable using the lamp 90 for traveling light distribution. When the lamp for passing light distribution is turned on, the lamp 90 for traveling light distribution is turned on with the infrared filter 92 attached to the light source, reflected by the reflecting mirror 93, There is also a system that functions as an infrared projector that irradiates far away.

  At this time, the infrared filter 92 includes a transparent high-refractive index film and a low-refractive index film each having a predetermined thickness on the outer surface of a carrier formed in a tubular shape (pipe shape) using heat-resistant glass or the like. In which an interference filter layer is formed by alternately laminating a plurality of layers, or in which coloring is performed so that the carrier itself has a filter function is employed.

  The infrared filter 92 is attached to a mechanism for causing the infrared filter 92 to be attached to and detached from the light source 91, and is driven by, for example, a solenoid or a motor. By moving forward and backward, the light source 91 is attached and detached. At this time, the infrared filter 92 is made of glass, and therefore processing for attaching to the above-described mechanism and the like is extremely difficult.

  Therefore, the mounting is likely to be low accuracy, and noise is generated due to vibration during traveling, and the quality is deteriorated, or the mounting is distorted and damage due to vibration during traveling is likely to occur. There was a point. In addition, when the mounting is low precision, for example, when used as an infrared projector, there is a problem that visible light often leaks.

  As a specific means for solving the above-described conventional problems, the present invention provides a vehicular lamp in which an infrared filter in which a carrier is formed in a cylindrical shape with a glass tube is detachably provided to a light source by a drive arm. The holding of the carrier with respect to the drive arm is performed in the thickness direction and the length direction, and the holding in the thickness direction is performed at least 2 each on the left and right of the line along the axial direction assumed on the outer surface of the cylindrical carrier. A protrusion-like seating surface supported from the outer surface side at a point, and a first spring that presses and holds the position supported by the seating surface from the inner surface side of the cylinder, and the holding in the length direction is the cylindrical shape By providing a vehicular lamp characterized in that it is a projection that is in contact with and supports one end of the carrier and a second spring that is pressed from the opposite end toward the projection. It is a solution.

  As described above, according to the present invention, the holding of the carrier with respect to the drive arm is performed in the thickness direction and the length direction, and the holding in the thickness direction is performed on the right and left of the line along the axial direction assumed on the outer surface of the cylindrical carrier. A projection-shaped seating surface supported from the outer surface side at least at two points, and a first spring that presses and holds the position supported by the seating surface from the inner surface side of the cylinder, and is held in a cylindrical shape In the first place, a hole for a glass tube is formed by providing a vehicle lamp that is a protrusion that supports and contacts one end of the carrier and a second spring that presses against the protrusion from the opposite end. Thus, the drive arm and the glass tube can be attached without performing the extremely difficult process.

  In addition, by attaching the drive arm and the glass tube by pressure contact with the spring, it is possible to attach without mechanical connection by mutual engagement such as screwing. Secure mounting is possible without causing the possibility of breakage.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure. What is denoted by reference numeral 1 in FIG. 1 is a vehicular lamp according to the present invention. The vehicular lamp 1 employs, for example, a halogen light bulb as a light source 2, and includes light including infrared light as well as visible light. Is radiated. Further, in correspondence with the light source 2, a reflecting mirror 3 having a rotating paraboloid with the light source 2 as a substantially focal point is provided, and the light from the light source 2 is reflected in the front direction of the vehicle. ing.

  The light source 2 is provided with a cylindrical infrared filter 4, which is attached to a drive arm 5 that performs an arc motion by a drive device such as a solenoid (not shown). The infrared filter 4 is detachable with respect to the light source 2. When the infrared filter 4 is detached, visible light is emitted from the vehicular lamp 1 to obtain a running light distribution. The vehicular lamp 1 emits infrared light of almost the same light distribution shape, and by visualizing it with night vision, it is possible to check distant obstacles without causing distraction to the driver of the oncoming vehicle. It is supposed to be possible.

  Here, FIG. 2 shows a configuration of the infrared filter 4, and the infrared filter 4 is roughly divided into a carrier 4a formed in a cylindrical shape (pipe shape) with colorless and transparent hard glass or the like. An interference filter in which a thin film having a predetermined film thickness with respect to a cutoff wavelength such as a ½ wavelength and a ¼ wavelength is formed by a high-refractive member and thin films that are similarly formed by a low-refractive member are laminated in multiple layers. And the layer 4b.

  Therefore, the entire infrared filter 4 is formed of a hard and brittle member, and so-called machining such as drilling and screwing is practically impossible, and mounting to the drive arm 5 described above is impossible. Even when hitting, it is necessary to consider an appropriate mounting structure. In addition, since this type of lamp 1 is subject to considerable vibrations and impacts as the vehicle travels, it is necessary to sufficiently consider the damage caused by the same.

  Further, in principle, when the infrared filter 4 is attached to the light source 2, the vehicular lamp 1 does not generate visible light. Therefore, the infrared filter 4 and the drive arm 5 can be attached. Therefore, a certain level of accuracy is required. Moreover, since the attachment / detachment of the infrared filter 4 to / from the light source 2 is repeatedly performed in the course of use of the vehicle, it is required to maintain the repeatability over a long period of time.

  3 to 5 show the attachment state of the infrared filter 4 and the drive arm 5 according to the present invention. First, the drive arm 5 has an infrared filter 4 as shown in FIGS. Seat surfaces 5 a that contact a plurality of positions of the outer diameter are provided, and each of the seat surfaces 5 a is in close contact with the outer surface of the infrared filter 4.

  The seating surface 5a is in contact with the outer surface of the infrared filter 4 at, for example, four points. When setting the position where the seating surface 5a and the infrared filter 4 are in contact with each other, the seating surface 5a is formed in a cylindrical shape. Assuming a straight line along the axial direction on the outer surface of the outer filter 4, two points equidistant from the center point of the assumed straight line are set on the straight line, and further equidistant from the two points in a direction perpendicular to the straight line. If two points are set, two points, convenience, and four points can be set on the left and right sides of the straight line.

  If the projecting seat surface 5a having the same arc as the outer surface of the infrared filter 4 is formed at the position where the four points are set on the drive arm 5 side, the above four The infrared filter 4 is placed in close contact on the seating surface 5a of the place without any gap or play.

  In this way, the infrared filter 4 placed on the drive arm 5 is provided with the first spring 6, and the drive arm 5 and the first spring 6 are used as shown in FIG. Clamping is performed. Therefore, the infrared filter 4 is held at a predetermined position in the thickness direction by the drive arm 5 and the first spring 6. The first spring 6 is fixed to the drive arm 5 at a predetermined position by screwing or the like.

  In the above configuration, the infrared filter 4 is certainly held in the thickness direction, but not sufficiently held in the length direction. The infrared filter 4 is moved in the axial direction due to vibration or the like. May cause movement. Therefore, in the present invention, in addition to the above, holding in the length direction is also performed. In this embodiment, holding is performed by providing the second spring 7 using the first spring 6.

  FIG. 6 shows a state in which the second spring 7 holds the infrared filter 4. First, one end portion of the infrared filter 4 (carrier 4 a) in the axial direction is formed by the protrusion 7 a. It is supported. Since the protrusion 7a is positioned by protruding contact with the infrared filter 4, it may be in a fixed state. Therefore, a part of the drive arm 5 provided with a seating surface 5a as shown in FIG. It may be provided.

  And the 2nd spring 7 is provided so that it may press-contact toward the said projection part 7a from the edge part on the opposite side. Therefore, the infrared filter 4 is fixed at a predetermined position by the spring pressure of the first spring 6 pressed against the seat surface 5a in the plate thickness direction, and pressed against the protrusion 7a in the axial direction. The second spring 7 is fixed at a predetermined position by the spring pressure.

  According to the results of the inventor's trial manufacture and examination when implementing the above configuration, the seating surface 5a and the protrusion 7a basically only need to give the infrared filter 4 a predetermined position. In reality, however, vibrations and impacts during traveling are transmitted to the infrared filter 4, so stress contact is caused by contact with an extremely small area, causing damage and the like. It becomes.

  Therefore, according to the inventor's study, as the area of the seating surface 5a and the protrusion 7a, an area of 1 mm to 10 mm square is ensured so that excessive stress due to concentration is not transmitted to the infrared filter 4. It is preferable. Further, by increasing the area of the seating surface 5a and the protruding portion 7a to some extent, for example, heat conduction from the infrared filter 4 is performed on the side of the drive arm 5 formed of a metal member or the like, and visible light A considerable effect can be recognized in promoting cooling of the infrared filter 4 storing heat by shielding.

  According to the present invention, when the infrared filter 4 is attached to the drive arm 5, the infrared filter 4 is placed on the seating surface 5a serving as a reference position for attachment and the projection 7a, and in this state, the first spring 6 and Since the correct mounting position can be obtained for the infrared filter 4 by press-contacting with the second spring 7, first, it is made of glass, is hard and difficult to process, and is damaged. The infrared filter 4 (carrier 4a), which is likely to be generated, can be attached to the drive arm 5 without being processed for attachment, simplifying the process and improving the yield.

  In addition, since mechanical engagement such as screwing is not performed on the infrared filter 4 as described above, the force caused by vibration, impact, etc. generated during traveling of the vehicle does not concentrate on the engagement portion, and the spring 6 and 7 are alleviated by the deformation. Therefore, the infrared filter 4 is not damaged even in such a state. In addition, since the deformation of the springs 6 and 7 is restored immediately after the stress is removed, the position of the infrared filter 4 is also restored at the same time, and no permanent deviation occurs in the mounting position.

  Further, the infrared filter 4 is usually a glass member, and the drive arm 5 is usually a metal member. However, since the infrared filter 4 is close to the light source 2 and becomes a very high temperature when turned on, the thermal expansion coefficient of the both is high. Due to the difference, when mechanical fixing is performed, there is a high risk of damage on the infrared filter 4 side due to environmental conditions and the like. Therefore, in the present invention, even when such a sudden temperature change occurs, the springs 6 and 7 are prevented from being damaged.

It is sectional drawing which shows embodiment of the vehicle lamp which concerns on this invention. It is explanatory drawing which shows the structure of the infrared filter which is the principal part of the vehicle lamp which concerns on this invention. It is a perspective view which shows the structure of the part of an infrared filter and a drive arm. It is explanatory drawing which shows the positional relationship of an infrared filter and a seat surface. It is explanatory drawing which shows the positional relationship of an infrared filter, a seat surface, and a 1st spring. It is explanatory drawing which shows the positional relationship of an infrared filter, protrusion, and a 2nd spring. It is explanatory drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source 3 ... Reflector 4 ... Infrared filter 4a ... Carrier 4b ... Interference filter layer 5 ... Drive arm 5a ... Seat surface 6 ... First spring 7 ... Second spring 7a ... Projection part

Claims (2)

  In a vehicular lamp in which an infrared filter in which a carrier is formed in a cylindrical shape with a glass tube is detachably attached to a light source by a drive arm, the carrier is held by the drive arm in a thickness direction and a length direction. The holding in the thickness direction is supported on the outer surface of the carrier having a cylindrical shape by supporting from the outer surface side at least two points on the left and right of the line along the axial direction, and the seat surface supports A first spring that presses and holds the position of the cylinder from the inner surface side of the cylinder, and the holding in the length direction is supported by one end of the cylindrical carrier and an end on the opposite side A vehicular lamp characterized in that the vehicular lamp is a second spring that is pressed toward the protrusion from the top.   2. The vehicular lamp according to claim 1, wherein the seating surface and the projection are in contact with the carrier by surface contact, and the contact area is 1 mm to 10 mm square.

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