JP4048131B2 - Lamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lamp device with a cap such as a discharge lamp used for general illumination, optical equipment, or a vehicle lamp.
[0002]
[Prior art]
Recently, metal halide lamps or high pressure discharge lamps that emit brighter light have been used as light sources for various devices including headlights. Conventionally, this type of lamp device must generate a dielectric breakdown between the electrodes by applying a high voltage when starting. However, in a lamp device of a type using a base, external lead wires led out from the lamp body are connected to external wires at positions close to each other. Therefore, each external lead wire is fitted with a ceramic insulation tube to maintain insulation between both external lead wires, but it still passes through a slight gap between the current-carrying member such as the electrode of the lamp body and the external lead. In some cases, abnormal discharge of current occurs between the wires or external lead wires, causing lighting failure.
[0003]
As an example of covering one external lead wire with a thick ceramic tube such as aluminum oxide, there is an invention described in US Pat. No. 5,250,872.
[0004]
[Prior art documents]
[0005]
[US Pat. No. 5,250,872]
[0006]
[Problems to be solved by the invention]
An object of the present invention is to develop a lamp device that can reliably prevent abnormal discharge that has occurred even from a slight gap by completely covering at least one of the external lead wires with an insulator.
[0007]
[Means for Solving the Problems]
The invention described in claim 1 relates to the double-end type lamp device (A1) according to the present embodiment, “from the sealing portions (7) and (8) provided on both sides of the arc tube portion (30a) to the external lead wire. (35b) (36b) is a double-ended type lamp body (a1), a base (2) attached to one end of the lamp body (a1), and a base mounting end of the lamp body (a1) ( a high pressure side external lead wire (35b) derived from a11) and a base (36b) derived from the other end of the lamp body (a1) and disposed along the lamp body (a1) ( 2) A lamp device (A1) composed of two external conductors (26) and (27) connected individually inside,
At one end, it is attached to the insulation coating (26b) of one external conductor (26) connected to the high voltage side external lead wire (35b) , and at the other end, the base mounting end of the lamp body (a1) It is attached to (a11) in an overlapping manner, and is exposed between the insulation coating (26b) of one external conductor (26 ) and the base mounting end (a11) of the lamp body (a1). It comprises a tubular insulating member (10) that surrounds the exposed portion (35d ) of the lead wire (35b) in the base (2) . "
[0008]
The invention according to claim 2 relates to another example of the double-end type lamp device (A1) according to the present embodiment, and “a sealing portion (7) (8) provided on both sides of the arc tube portion (30a)”. A double-ended lamp body (a1) from which external lead wires (35b) (36b) are led out, a base (2) attached to one end of the lamp body (a1), and the lamp body (a1) The external lead wire (36b) led out from the end is covered, and one end of the external lead wire (36b) is disposed in the base (2), and the external lead wire (35b) (36b) in the base (2) A lamp device (A1) composed of two external conductors (26) and (27) individually connected to
In one end portion is attached to overlap the mouthpiece mounting end of the lamp body (a1) (a11) at one of the insulating coating (26b) on and the other end attached overlapping of the external conductor (26) , insulating coating (26b) and exposed portions (35d) of the mouthpiece of the mouthpiece mounting end of the lamp body (a1) (a11) and the external lead wire is exposed between the (35b) of one of the external conductors (26) ( 2) A tubular insulating member (10) surrounded by and an insulating tube (6) attached at one end to overlap the insulating coating (27b) of the other external conductor (27) and at the other end Of the external lead wire (36b) exposed between the insulation coating (27b) of the other external conductor (27 ) and the insertion end of the insulation tube (6 ) . It includes at least one of a tubular insulating member (10) that surrounds the exposed portion (36d) in the base (2) .
[0009]
The invention according to claim 3 relates to the single-ended type lamp device (A2) according to the present embodiment, “from the sealing portion (9) provided on one side of the arc tube portion (30a ) to the external lead wire (35b). (36b) is a single-ended type lamp body (a2), a base (2) attached to the sealing part (9) of the lamp body (a2 ) , and an external lead wire in the base (2) . (35b) a lamp device configured out with two external conductors are connected individually (26) (27) to (36b),
Two projections (9a) and (9b) through which the pair of external lead wires (35b) and (36b) pass are projected at the end of the sealing portion (9 ) in the lamp body (a2) .
The lamp body (a2) is attached so as to overlap with one protrusion (9a) at one end and is attached to the insulation coating (26b) of one external conductor (26) at the other end. The exposed portion (35d) of the external lead wire (35b) that is exposed between the base mounting end (a11) and the insulation coating (26b) of one external conductor (26) is enclosed in the base (2). tubular insulating member (10), and whereas the insulating coating of the other external lead wire in and the other end attached to overlap the other projection (9b) at an end portion (27) (27b) overlap The exposed portion (36d ) of the external lead wire (36b) that is attached and is exposed between the cap mounting end (a11) of the lamp body (a2) and the insulation coating (27b) of the other external conductor (27) ) Is provided with at least one of a tubular insulating member (10) surrounding the base (2) .
[0010]
In this case, the exposed part (35d) or (36d) of the external lead wire (35b) or (36b) in the base (2), which is susceptible to abnormal discharge with respect to the high voltage at the start, is particularly exposed on the high voltage side. (35d) is reliably covered with the insulating member (10), so there is an abnormality between both external lead wires (35b) (36b) or between the low-voltage external lead wire (36b) and one high-voltage electrode (33). It was possible to reliably prevent the occurrence of discharge (R) and eliminate the lighting failure.
[0011]
The lamp device (A) described in "Claim 4" is "the lamp body (a1) (a2) is composed of an inner bulb (3) and an outer bulb (4) surrounding the inner bulb (3)". [(Imaginary line in FIGS. 1, 2, 5 and 4)], the lamp device (A) according to claim 5 is a “single tube in which the lamp body (a1) (a2) does not have an outer bulb (4). (3 ′) ”[(solid line in FIGS. 3 and 4)].
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a lamp device (A1) according to an embodiment of the present invention. In this example, the lamp device is used as a light source body such as a headlight of an automobile. I do not stick.
[0013]
This lamp device (A1) generally consists of a reflector (1), a base (2), a light emitting inner bulb (3), an outer bulb (4), an external lead wire (36b), and an insulation for covering the external lead wire. (When a high voltage is applied to the external lead wire (35b) side on the lamp body (a1) side, the high voltage side external lead wire (35b) is securely insulated. In this case, the insulating tube (6) is not necessarily required. Here, the case where the insulating tube (6) is used will be described as a representative example.)
[0014]
The reflector (1) is made of a glass material, polycarbonate, or the like, to which an infrared transmission film or a visible light reflection film is attached so that light from an inner bulb for light emission described later is directed to a projection unit (not shown) in front. Molded in a bowl-shaped tip using a variety of resin and aluminum. A cylindrical valve insertion hole (1a) is formed at the rear top of the reflector (1), and the rear of the valve insertion hole (1a) has a larger diameter than the valve insertion hole (1a). An engagement step portion (1b) is formed.
[0015]
The base (2) is made of synthetic resin, metal, or the like, and is a valve holding recess (21) dug into the front side of the base (20), a reflector mounting collar (projected on the outer periphery of the base (20)) 22) and a connector part (23) constituting the rear end part of the base part (20).
[0016]
A pair of terminal holding holes (24) and (25) are formed in the rear end surface of the connector part (23), and the terminal holding holes (24) and (25) are respectively connected to the external conductors (26) and (27). ) Is inserted. The valve holding recess (21) is formed in a circular hole cylindrical shape.
[0017]
An annular upright wall portion (2a) having an inverted L-shaped cross section surrounding the valve holding recess (21) is integrally formed on the front side of the base portion (20), and at the tip of the annular upright wall portion (2a), a cross-section L A letter-shaped flange portion (2c) is integrally formed, and the flange portion (22) for mounting the reflector is constituted by the flange portion (2c) and the tip end portion (2b) of the annular standing wall portion (2a). Yes. That is, when the tip (2b) of the annular standing wall (2a) is inserted into the valve insertion hole (1a) in the reflector (1), the flange (2c) is engaged with the engagement step (1b). It has come to be.
[0018]
The inner bulb (3) for light emission includes a cylindrical envelope container (30) made of quartz glass and a pair of electrode mounts (31) (32). A spherical arc tube portion (30a) is formed at a substantially central portion of the envelope container (30), and necessary inclusions such as necessary gas, metal halide and mercury (not shown) are enclosed therein. Both sides of the arc tube portion (30a) are sealed portions (7) and (8). On the other hand, the electrode mounts (31) and (32) are composed of electrodes (33) and (34) and current-carrying members (35) and (36). 30a) are arranged linearly so as to face each other.
[0019]
The current-carrying member (35) (36) is a metal foil (35a) (36a) connected to the outer end of the electrode (33) (34) and an external connected to the outer end of the metal foil (35a) (36a). It consists of lead wires (35b) and (36b).
[0020]
The proximal end (3a) and the distal end (3b) of the inner valve (3) are located on the inner peripheral surface of the constricted portion (4c1) (4c2) of the proximal end (4a) and the distal end (4b) of the outer valve (4). The entire inner valve (3) is housed and held in the outer valve (4) by fusing and integrating. The base end portion (4a) of the outer valve (4) is inserted into the valve holding recess (21) in the base (2), and a metal ring body (tightened and fixed around the constricted portion (4c1)) ( 41) is attached in the annular standing wall (2a) of the base (2).
[0021]
On the outer end of the external lead wire (35b) of one electrode mount (31), a substantially C-shaped or zigzag bent portion (35c) like this example is coupled [bend portion (35c) Is for preventing the electrode mount (31) from moving when the electrode mount (31) is sealed], and the outer end of the bent portion (35c) extends from the base end (3a) of the inner valve (3). It extends to the base (2) side and is electrically connected to the core wire (26a) of the external conductor (26) directly or via a conductor by soldering or laser welding.
[0022]
The portion corresponding to the metal foils (35a) and (36a) in the sealed container (30) is well known while being heated after the electrode mounts (31) and (32) are inserted into the sealed container (30). It is sealed by performing a shrink or pinch seal. This portion is a sealing portion (7) (8), and metal foils (35a) (36a) are embedded.
[0023]
The outer bulb (4) is for shielding ultraviolet rays and preventing fragments from scattering when the inner bulb (3) bursts.The outer bulb (4) is made of cylindrical quartz glass having a diameter larger than that of the envelope container (30). And the inner valve (3) is disposed so as to cover the outer peripheral side. As described above, the base end (4a) of the outer valve (4) is inserted into the valve holding recess (21) of the base (2) and the base (2) of the base (2) is formed by the metal ring body (41). It is fixed in the annular standing wall (2a).
[0024]
The external lead wire (35b) in the other electrode mount (32) is led out from the tip (3b) of the inner valve (3), bent as it is, and disposed along the outer peripheral surface of the outer valve (4), and one end ( 5a) extends to the base (2) side, and is electrically connected to the lead wire (27a) of the other external lead wire (27) directly or via the lead wire by soldering, laser welding or the like.
[0025]
The insulating tube (6) is used to prevent the occurrence of abnormal discharge that tends to occur when a high voltage is applied at the beginning of lighting between the external lead wire (36b) and the electrode mount (31) of the inner bulb (3). The outer lead wire (36b), which is led out from the tip (3b) of the inner valve (3) and arranged along the outer valve (4), covers one end of the inner valve (3). .
[0026]
The lamp device (A1) is assembled by connecting the external lead wire (35b) and the core wire (26a) of the external lead wire (26) in advance, and the base end (3a) of the inner bulb (3) and the external lead wire (26 Wrap the sheet-like insulation member (10) so that it overlaps the end of the insulation coating (26b), and expose the external lead wire (35b) from the base end (3a) of the inner valve (3) Insulate the whole. Of course, the insulating member (10) may be in the form of a tube or a shrinkable silicon or tetrafluoroethylene tube.
[0027]
Here, the overlap portion is effective for preventing discharge by preventing a gap from being formed between the insulating member (10) and the base end portion (3a) of the inner valve (3) or the insulating coating (26b). The two may be bonded using an adhesive. In addition, when the external lead wire (35b) on the inner valve (3) side is on the high pressure side, the longer the overlap amount of the insulation coating (26b) between the insulating member (10) and the external conductor (26) is as long as possible This is preferable for suppressing abnormal discharge between the lead wire (35b) and the external ground.
[0028]
Subsequently, after attaching the metal ring body (41) to the lamp body (a1), the external conductor (26) is inserted into the terminal holding hole (24) from the bulb holding recess (21) side of the base (2). Insert the end (6a) of the insulating tube (6) into the insulating tube mounting hole (61) of the base (2). Thereby, the metal ring body (41) is positioned in the bulb holding recess (21) as shown in FIG. 1, and the position of the arc tube portion (30a) with respect to the base (2) is adjusted three-dimensionally (in other words, When the base (2) is attached to the reflector (1), the arc tube (30a) is adjusted so that it is positioned exactly at the focal point of the reflector (1)), and a metal ring body ( 41) is heated and welded and fixed to the annular standing wall (2a) of the base (2). Finally, using the through hole (29) provided on the side surface of the base (2), the external lead wire (36b) on the insulating tube (6) side and the other lead wire (27a) are connected by the above method. Electrical connection is made, and finally the through hole (29) is closed with a cap (28) to complete the assembly of the lamp device (A1).
[0029]
At this time, as shown in FIG. 1, the insulating member (10) is located in one terminal holding hole (24) and is led out from the sealing portion (7) of the inner valve (3), and the sealing portion (7) The entire exposed portion that is exposed from the base end portion (3a) of the non-sealed tube portion that extends from and reaches the insulating coating (26b) of the external conductor (26) is insulated by the insulating member (10). .
[0030]
When the lamp device (A1) configured as described above is lit, a high voltage is applied as described above at the time of starting, but the external lead wire (35b) is connected to the external conductor (26). Since it is insulated over the entire length up to the insulation coating (26b), abnormal discharge does not occur and the start-up lighting is stably performed.
[0031]
FIG. 2 is a modification of FIG. 1 and shows an example in which the end of the insulating member (10) is attached to the base end (4a) of the outer valve (4) so as to overlap with the case of FIG. The same effect is produced.
[0032]
FIG. 3 shows an example in which the outer valve (4) is not used and the same valve as the inner valve (3) is used, and the same effect as in the case of FIG. 1 is produced. The method of attaching the insulating member (10) may be the case of either FIG. 1 or FIG.
[0033]
FIG. 4 shows a case where the lamp body (a2) is a single-ended type. In this case, at least one of the external lead wires (35b) and / or (36b) is insulated by the insulating member (10) as described above. become. However, in the case of the single-end type lamp body (a2), two external lead wires (35b) (36b) are led out from the same sealing portion (9), so the external lead wire (35b) ( In order to separate 36b), protrusions (9a) and (9b) through which the external lead wires (35b) and (36b) penetrate from the end of the sealing part (9), and the protrusions (9a) and (9b) It is necessary to overlap the insulating member (10) with at least one of them. The other points including the double tube or single tube are the same as those described in the embodiment of FIG.
[0034]
In addition, if the bulb holding recess (21) is closely filled with an adhesive after assembly, there is a further effect in preventing abnormal discharge.
[0035]
【The invention's effect】
The present invention relates to the external lead wire led out from the base mounting end of the lamp body, and the exposure of the external lead wire between the base mounting end of the lamp body or the insertion end of the insulating tube and the insulation coating of the external conductor in the base. Since at least one of the portions is covered with an insulating member that overlaps with the base mounting end or the insertion end and the insulating coating, the discharge path is blocked and the withstand voltage becomes sufficient, even in the presence of a slight gap. It was possible to reliably prevent the abnormal discharge that occurred, and to solve the lighting start failure.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a lamp device according to an embodiment of the present invention.
2 is a cross-sectional view of a main part of a modification of FIG. 1. FIG. 3 is a cross-sectional view of a main part of still another modification of FIG.
FIG. 4 is a cross-sectional view using a single-ended lamp as a lamp body.
FIG. 5 is a cross-sectional view of a main part showing another example of mounting an insulating member.
FIG. 6 is an explanatory diagram when an abnormal discharge occurs in a conventional lamp device.
[Explanation of symbols]
(a1) (a2) ・ ・ ・ Lamp body
(a11) ・ ・ ・ ・ Base mounting end
(1) ・ ・ ・ ・ ・ Reflector
(1a) ・ ・ ・ ・ ・ Valve insertion hole
(2) ...
(3) ... Inner valve
(3a) ・ ・ ・ ・ Base end of inner valve
(4) ・ ・ ・ ・ ・ Outer valve
(4a) ・ ・ ・ ・ ・ Outer valve base end
(5) ・ ・ ・ ・ ・ External lead wire
(6) ・ ・ ・ ・ ・ Insulated tube
(6) (7) ... Sealing part
(26) (27) ・ ・ ・ External terminal piece
(30) ・ ・ ・ ・ ・ Enclosure container
(30a) ・ ・ ・ ・ Arc tube part
(35) (36) ・ ・ ・ Conducting member
(35b) (36b) ・ ・ External lead wire

Claims (5)

A double-ended type lamp body from which external lead wires are led out from sealing portions provided on both sides of the arc tube, a base mounted at one end of the lamp body, and a base mounting end of the lamp body high-pressure-side external lead wire and the lamp that is constituted by the two external conductors connected individually mouthpiece inside the low pressure side external lead wire disposed along and lamp body is derived from the other end of the lamp body A device,
At one end, it is attached so as to overlap with the insulation coating of one external conductor connected to the high-voltage side external lead wire, and at the other end, it is attached so as to overlap with the cap mounting end of the lamp body. A lamp device comprising a tube-shaped insulating member that surrounds an exposed portion of a high voltage side external lead wire exposed between an insulating coating of an external conductor and a base mounting end of a lamp body . Double-end type lamp body with external lead wires led out from sealing parts provided on both sides of the arc tube part, a base attached to one end of the lamp body, and an external part led out from the other end of the lamp body A lamp device comprising: an insulating tube covering a lead wire, one end of which is disposed on the base; and two external conductors individually connected to the external lead wire in the base;
At one end, it is attached so as to overlap with the insulation coating of one external conductor, and at the other end, it is attached so as to overlap with the cap mounting end of the lamp body. A tubular insulating member that surrounds the exposed portion of the external lead wire exposed between the cap mounting end and the cap mounting end, and is attached to the insulating coating of the other external conductor at one end and overlapped with the other. At the end, it is attached so as to overlap the insertion end of the insulation tube, and the exposed portion of the external lead wire exposed between the insulation coating of the other external conductor and the insertion end of the insulation tube is enclosed in the base. A lamp device comprising at least one of tubular insulating members . A single-ended lamp body in which a pair of external lead wires are led out from a sealing part provided on one side of the arc tube part, a base attached to the sealing part of the lamp body, and an external lead wire in the base A lamp device composed of two external conductors individually connected to each other,
Two protrusions through which a pair of external lead wires penetrates protrude from the end of the sealing portion in the lamp body,
At one end, it is attached so as to overlap with one protrusion, and at the other end, it is attached so as to overlap with the insulation coating of one external conductor. A tubular insulating member that surrounds the exposed portion of the external lead wire exposed between and in the base, and is attached to the other protrusion at one end portion and overlapped with the other projection at the other end portion A tube-like shape that surrounds the exposed portion of the external lead wire that is exposed between the cap mounting end of the lamp body and the insulating coating of the other external conductor in the cap. A lamp device comprising at least one of insulating members . The lamp device according to any one of claims 1 to 3, wherein the lamp body includes an inner bulb and an outer bulb surrounding the inner bulb .   The lamp device according to any one of claims 1 to 3, wherein the lamp body is a single tube having no outer bulb.

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