JP7089224B2 - Lamp with E-shaped base - Google Patents

Description

The present invention relates to a lamp provided with an E-shaped base.

There are many lamps on the market with E-shaped caps (also known as "bulb-shaped"). The light emitting part of the lamp has evolved one after another to an incandescent lamp, an HID lamp, and an LED lamp, but the power feeding part is still an E-shaped base and has not changed. During this time, the shape, structure, weight, etc. of the lamp have changed significantly.

The method of fixing the E-shaped base to the lamp also differs depending on the type of lamp. FIG. 1 is a diagram illustrating a method of fixing an E-shaped base to a HID lamp. In the HID lamp 10, a groove 16 extending in the direction of the lamp axis is formed in the male screw portion 14 of the glass bulb neck portion 12, and one of the two lead wires 18a and 18b 18b is bent along the groove. In the arranged state, the metal body portion (also referred to as “cap”) 20 is screwed in, and the end portion of the lead wire 18b protruding from the groove portion 16a exposed at the upper end portion of the metal body portion is folded back, and this groove portion is formed. High-temperature solder is poured into the groove to fill the groove with solder. By this solder pouring method, both the electrical connection of one lead wire 18b and the fixing of the base 20 have been realized.

Japanese Patent Application Laid-Open No. 2013-225459 "Lamp with E-shaped base" (Publication date: 2013/10/31) Applicant: Iwasaki Electric Co., Ltd. (Patent No. 5838899) JP 2000-173303 "Bulb-shaped fluorescent lamp" (Publication date: 2000/06/23) Applicant: Toshiba Lighting & Technology Corporation (Patent No. 3753291)

FIG. 2 is a diagram illustrating a method of fixing the E-shaped base to the LED lamp. In the LED lamp 22 provided with the E-shaped base, the base receiving member 24 is a resin mold member instead of glass. The receiving member 24 is made of a synthetic resin, and is, for example, polycarbonate, PBT (polybutylene terephthalate), or the like. Therefore, since the heat resistant temperature is relatively low, the solder pouring method cannot be adopted. Therefore, by adopting the caulking method, two local recesses are formed in the receiving member 24, the metal body portion (base) 20 is screwed in, and then the portion covering the recesses is locally deformed to receive. It was engaged with the member 24 and fixed the E-shaped base.

However, this caulking method is easier to remove the base than the solder pouring method used in HID lamps, and in particular, depending on the type of resin of the receiving member 24, it can be easily removed in the counterclockwise direction to loosen the screwing. There was a tendency to end up.

Therefore, an object of the present invention is to provide an LED lamp provided with an E-shaped base that can securely fix the base to the base holder of the resin mold.

The LED lamp provided with the E-shaped base according to the present invention has, on one side, a base made of synthetic resin and an E-shaped base screwed into the base, and the base and the E-shaped base. Is fixed by caulking through which the caulked portion of the E-shaped base is penetrated.

Further, in the LED lamp provided with the E-shaped base, the caulking location may be a plurality of locations.

Further, in the LED lamp provided with the E-shaped base, the size and shape of the caulked shape at the plurality of locations may be different from each other.

Further, in the LED lamp provided with the E-shaped base, the caulked portion may be formed on the valley side of the screw of the base.

Further, in the LED lamp provided with the E-shaped base, the caulked portion may be formed near the end of the screw of the base.

Further, in the LED lamp provided with the E-shaped base, the adhesive strength of the base may satisfy the following equations (a) to (c).
(a) Adhesive strength between power supply socket and base (clockwise twist) ≧ 5 [Nm]
(b) [Adhesive force between power supply socket and base (counterclockwise twist)] x K ≤ base-base holder (resin) (counterclockwise twist)
However, K is a safety factor, and K = 1.2.
(c) Between base and base holder (resin) (counterclockwise twist) ≧ 5 [Nm]

Further, in the LED lamp provided with the E-shaped base, the blade used for forming the caulking may be a flat blade or a pointed round bar.

Further, in the LED lamp provided with the E-shaped base, a receiving groove (recess) may be formed in advance at a portion corresponding to the punched portion 26 of the base receiving base.

According to the present invention, it is possible to provide an LED lamp provided with an E-shaped base that can securely fix the base to the base holder of the resin mold.

FIG. 1 is a diagram illustrating a method of fixing an E-shaped base to a HID lamp. FIG. 2 is a diagram illustrating a method of fixing the E-shaped base to the LED lamp. FIG. 3 is an enlarged partial view of an LED lamp that receives a base and is fixed to a member by a through caulking method. FIG. 4 is a diagram illustrating a shape in which the base 20 is punched and crimped from the crimped portion 26. FIG. 5 is a table showing the experimental results of the adhesive strength of the base. FIG. 6 is a table showing the experimental results of the caulking shape for realizing the various caulking shapes shown in FIG.

Hereinafter, an embodiment of a lamp provided with an E-shaped base according to the present invention will be described in detail with reference to the attached drawings. In the figure, the same reference number is assigned to the same member, and duplicate description is omitted.

[Background of adoption of this embodiment]
In the caulking method currently adopted, the metal body portion is locally deformed to fix the E-shaped base 20. However, the base 20 tends to come off easily, and in particular, depending on the type of the receiving member 24, it tends to come off easily in the counterclockwise direction in which the screwing is loosened. When the present inventor investigated the current LED lamp, he pressed the metal body portion 20 at the time of caulking to locally deform it, but did not penetrate it. The thickness of the base 20 is about 0.3 mm, and it is considered that the mechanical strength was insufficient to press and engage the receiving member 24.

Therefore, a comprehensive study was made on the adhesive strength of the base 20 when the metal body portion 20 was locally penetrated during caulking and the generated metal burrs were received and engaged with the member 24. FIG. 3 is an enlarged partial view of an LED lamp that receives a base 20 and is fixed to a member 24 by a through caulking method.

[Penetration caulking method]
(Shape of caulked part)
FIG. 4 is a diagram illustrating a shape in which the base 20 is punched and crimped from the crimped portion 26. In the figure, the left side shows the punched shape showing the cut surface with a solid line (thick line), and the right side shows the bent shape showing the mountain fold line with a broken line. In (A), the cut surface of the punched portion 26 is punched into an H shape in English capital letters, (B) is punched into an I shape (or 90 ° rotation H shape), and (C) is punched into an X shape. Depending on the material, hardness, etc. of the receiving member 24, a receiving groove (recess) may be formed in advance at a portion corresponding to the punched portion 26 of the receiving member 24.

The evaluation regarding the shape of these caulked parts is as follows.
(1) FIG. 4 (A) is most preferable. As shown in the figure, it is punched into an English capital letter "H" and bent in the vertical direction as seen in the figure. As seen in the figure, the bent portion is difficult to return even in the left-right direction of rotation, which is the most ideal shape for fixing (caulking) the base.
(2) In FIG. 4B, as compared with FIG. 4A, the bent portion is more easily returned by being pushed by the groove of the base receiver.
(3) FIG. 4 (C) does not reach FIG. 4 (A) because it has a bent portion in the vertical direction as compared with FIGS. 4 (A) and 4 (B), but FIG. 4 (B) ) Is a more robust fixing method.

(Experiment of adhesive strength of base)
FIG. 5 is a table showing the experimental results of the adhesive strength of the base. Adhesive strength experiments are conducted in the column direction.
(1) Power supply socket-base (clockwise twist),
(2) Power supply socket-base (counterclockwise twist),
(3) Between the base and the base holder (resin) (twisting counterclockwise),
It shows the adhesive strength of the base.

The sample used is shown with reference to the blade used for punching in the row direction. That is,
(1) Flat blade,
(2) Square cut small blade,
(3) Square cut large blade,
(4) Double-sided cut-shaped blade,
(5) Single-sided cut-shaped blade,
(6) Single-sided cut-shaped blade,
(7) Flat blade (Note: The shape is similar to (1), the size is relatively small),
Is.

As a measuring instrument, a digital torque analyzer manufactured by Nakamura Seisakusho and a model number KDTA N20SV were used, and the measurement was performed at peak hold.

Since the case of the base adhesive strength of the base E39 of the HID lamp is 5 [Nm] or more, the selection criteria are the same as this, and are as follows.
(a) Adhesive strength between power supply socket and base (clockwise twist) ≧ 5 [Nm]
(b) [Adhesive force between power supply socket and base (twist in the counterclockwise direction)] x Safety factor ≤ Base and base holder (resin) (twist in the counterclockwise direction)
Safety factor: This is because it is necessary to consider factors such as the type and condition of the existing power supply socket and sticking after use. Here, based on the inventor's experience in lamp research and development, a safety factor of 1.2 was adopted.
(c) Between base and base holder (resin) (counterclockwise twist) ≧ 5 [Nm]
As a result of the experiment, the adhesive strength of the base satisfied the selection criteria (a) to (c) in all the samples.

(Experiment of caulking shape)
FIG. 6 is a table showing the experimental results of the caulking shape for realizing the various caulking shapes shown in FIG. Here, the receiving member 24 uses PBT-GF30 (polybutylene terephthalate glass fiber 30%).
The caulking shape experiment is performed in the column direction.
(1) Cutting edge,
(2) Caulking marks (lower position on the valley side, upper position on the valley side)
Is.
The sample used is shown with reference to the blade used for punching in the row direction. That is, it is the same as the blade used for punching shown in FIGS. 5 (1) to (7).

The selection criteria are
(a) Adhesive strength of the base,
(b) The shape of the caulking marks is beautiful (presence or absence of deformation, etc.),
(c) Presence or absence of deformation of the base after punching,
Is.

As a result, for all the samples, the adhesive strength of the base satisfied the criteria (a) to (c) described in FIG. Regarding the shape of the caulking marks and the presence or absence of deformation of the base after punching, the base was removed cleanly when the flat-shaped blades (1) and (7) were used. Furthermore, when the relatively small flat-shaped blade of (7) was used, the base was pulled out more cleanly.

In this embodiment, a four-direction caulking machine is adopted. Conventionally, a two-way caulking machine was used, but two more punches were added to make it four-way. The added two-way punch blade has a pointed round bar shape. Regarding caulking in four directions, the size and shape of the caulking shape are different. Further, it was decided to crimp on the valley side of the screw of the base so as to bite deeply into the receiving member 24. Also, considering the fitting of the power supply socket, it was decided to crimp near the end of the screw of the base.

[summary]
Although the embodiments of the lamp provided with the E-shaped base according to the present invention have been described above, these are examples and do not limit the present invention in any way. Additions, deletions, changes, improvements, etc. that can be easily made to the present embodiment by those skilled in the art are within the scope of the present invention. The technical scope of the present invention is defined by the appended claims.

10: HID lamp, 12: bulb neck part, 14: male screw part, 16: groove, 16a: groove part, 18a, 18b: lead wire, 20: metal body part, E-shaped base, base, 22: LED lamp , 24: Receiving member, 26: Caulking part

Claims (7)

In an LED lamp equipped with an E-shaped base,
With a synthetic resin base and
It has an E-shaped base screwed into the base cradle, and has an E-shaped base.
The base cradle and the E-shaped base are fixed by caulking through which the crimped portion of the E-shaped base penetrates, and the crimped portion is formed on the valley side of the screw of the base, an LED lamp. In the LED lamp provided with the E-shaped base according to claim 1,
The caulked part is an LED lamp which is a plurality of places. In the LED lamp provided with the E-shaped base according to claim 2.
LED lamps having different sizes and shapes of caulking at the plurality of locations. In the LED lamp provided with the E-shaped base according to any one of claims 1 to 3.
The crimped portion is an LED lamp formed near the end of the screw of the base. In an LED lamp equipped with an E-shaped base,
With a synthetic resin base and
It has an E-shaped base screwed into the base cradle, and has an E-shaped base.
The base and the E-shaped base are fixed by the caulking through which the caulked part of the E-shaped base penetrates.
An LED lamp whose adhesive strength of the base satisfies the following formulas (a) to (c) .
(A) Adhesive strength between the power supply socket and the base (clockwise twist) ≧ 5 [Nm]
(B) [Adhesive force between power supply socket and base (counterclockwise twist)] x K ≤ base-base holder (resin) (counterclockwise twist)
However, K is a safety factor, and K = 1.2.
(C) Between base and base holder (resin) (counterclockwise twist) ≧ 5 [Nm] In an LED lamp equipped with an E-shaped base,
With a synthetic resin base and
It has an E-shaped base screwed into the base cradle, and has an E-shaped base.
The base and the E-shaped base are fixed by the caulking through which the caulked part of the E-shaped base penetrates.
The blade used for forming the caulking is an LED lamp having a flat blade or a pointed round bar . In the LED lamp provided with the E-shaped base according to any one of claims 1 to 6 .
An LED lamp in which a receiving groove (recess) is formed in advance at a portion corresponding to a punched portion of the base cradle.

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