JPH03250557A - Incandescent lamp with dimple and its manufacturing method - Google Patents

Abstract

PURPOSE:To ensure holding a ring anchor and preclude crack initiation in the bulb by specifying the shape of a pair of dimples. CONSTITUTION:A ring anchor 21 fixed to a filament 2 of this electric bulb concerned is secured by each pair of dimples 14, 14 and 15, 15. The distance between each pair of dimples l is 5.5+ or -0.5mm with the dimple depth (d) of 1.2+ or -0.3mm, and the outer tube shape of a tubular bulb 1 remains in each inter- dimple part 12. These dimples is preferably formed by allowing the flame axis of a gas burner or the axes of two gas burners arranged closely in parallel to intersect the bulb 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dimpled incandescent light bulb in which a recess is formed in a tube-type bulb and a ring anchor is fixed in position in the recess, and a method for manufacturing the same. .

[Prior Art] Incandescent light bulbs, which are made by disposing a filament along the axis of a straight tube-shaped bulb, are widely used in various fields such as light sources for lighting and heat sources for heaters. It has the structure shown in the figure. That is, a filament 2 is disposed between crimp sealing portions 11 formed at both ends of the tubular bulb l, and ring anchors 21 are provided at several locations to hold the filament 2 along the axis of the tubular bulb 1. installed. Note that 4 is a metal foil embedded in the crimp sealing part 11, and 5 is an external lead for supplying electricity.

Incandescent light bulbs configured in this way do not have a structure that proactively prevents the filament from expanding or contracting in the direction of the tube axis, so the filament may expand or contract due to vibration or may sag when lit vertically, causing premature damage. There may be a disconnection.

Therefore, as shown in FIG.
By forming and fixing the position, the filament 2 is prevented from moving in the tube axis direction.

[Problem to be solved by the invention]

However, the dimple 13 shown in Fig. 6 is processed by heating the area directly above the ring anchor 21 with a single gas burner, so although the recess is formed over a fairly wide area, the depth of the recess is shallow, and therefore the ring anchor itself is Since the holding is not reliable and the ring anchor is fixed by touching the bottom of the dimple, there is a problem that cracks are likely to occur in the bulb due to thermal expansion or impact of the ring anchor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a dimpled incandescent light bulb that can securely hold a ring anchor and prevent cracks from forming in the bulb, and a method for manufacturing the same.

[Structure of the invention]

The incandescent light bulb with dimples of the present invention is an incandescent light bulb with dimples in which a ring anchor for holding a filament is fixed in position by a dimple formed on a tube-shaped bulb, and the dimple has two rings sandwiching the ring anchor. The distance between the pair of dimples is 5.
．． 5±0.5mm, dimple depth 1.2±o,s
mm, and the outer tube shape of the tubular valve remains between the pair of dimples.

Further, in the first method of manufacturing a dimpled incandescent light bulb of the present invention, the axis of the flame emitted from two gas burners arranged close to each other in parallel is made to cross three-dimensionally with respect to the tube-shaped bulb, and the two The two gas burners are arranged so that the ring anchor is located approximately in the middle of the two lateral flames to form the pair of dimples according to claim 1.

Furthermore, in the second method of manufacturing an incandescent light bulb with dimples of the present invention, the axis of the flame emitted from the gas burner is shifted by a predetermined distance from the ring anchor, and the dimples on one side are intersected with the tube-shaped bulb. The method comprises a first step of forming the dimples, and a second step of moving the axis of the flame in parallel to similarly form the other dimple, and the first and second steps form the pair of dimples according to claim 1. It is characterized by forming.

[Effect]

The distance between dimples is 5.5±0.511 fl! , the depth of the dimples is 1.2±0.3a+m, and the shape of the pipe valve is left between these dimples, so the ring anchor can be held securely with the deeply formed dimples, and the ring anchor Since the ring anchor is held between two independent dimples with a certain clearance, there will be no cracks in the valve.

These pairs of dimples are created by intersecting the axis of the flame of one or two gas burners close to each other in parallel with the tube-shaped valve, so that the dimples are formed in a pair with a certain distance and depth. Dimples can be formed quickly and reliably.

〔Example〕

The details of the present invention will be specifically explained below based on the drawings.

FIG. 1 is a partially enlarged sectional view of the incandescent light bulb with dimples of the present invention.
It is held so as to be sandwiched between 4.14 and 15.15. Between these two pairs of dimples 14.14 and 15.15, the outer tube shape of the tubular valve 1 remains as it is, and furthermore, between the two pairs of dimples 14.14 and 15.15,
and 15, 15, the inter-dimple distance 1 is 5.5±0.
5mm, and the dimple depth d is 1.2±0°3+nm. A small clearance is formed between the two.

However, since this clearance is as small as 01 to 0.5 mm, the ring anchor 21 is less likely to shake.

Next, a method for manufacturing a dimpled incandescent light bulb according to the second aspect of the present invention will be described.

As shown in Figure 2, the manufacturing procedure is to hold both ends of a tube-type incandescent light bulb and place two gas burners 30 at positions where the axis of the flame 31 of the gas burner 30 intersects with the tube-type bulb l. . At this time, the distance between the two gas burners 30, 30 is 6 mm, and the distance between the axis of the flame 31 and the pipe valve 1 is set to 0.5 mm. Then, set the ring anchor 21 so that it is located between the two gas burners 30, and burn hydrogen at a flow rate of 3.51/min and oxygen at a flow rate of 1.71/min for about 10 seconds to form a pair of dimples. . The size of the flame 31 formed at this time is 50 mm in length.
, the maximum diameter is 2 mm. Then, either the incandescent light bulb is reversed and another dimple is formed at the opposite position, or the conditions such as gas flow rate and processing time are the same. Furthermore, the gas pressure sealed in the incandescent light bulb greatly influences the shape of the dimples formed. That is, it can be seen from this figure that FIG. 3 is a diagram showing the relationship between the gas filling pressure of the tube-type valve 1 and the depth of the dimple when the dimple is formed by intersecting the tube-type valve 1 and the flame 31. It can be seen that when the sealing pressure of the tubular valve I is set to 70 cmHg or less, the depth of the dimples formed hardly changes. When the sealing pressure exceeds 70 cmHg, the dimples formed rapidly become shallower, reaching 73 cm.
With Hg, only half the depth is formed.

Figure 4 also shows the difference in depth between the first and second dimples and the gas filling pressure at room temperature when the first dimple is formed, the incandescent lamp is turned over, and the second dimple is formed. This shows the relationship between the sealing pressure at room temperature and 56
If the temperature is less than cmHg, it can be seen that there is almost no difference in the depth of the dimples formed. Therefore, it is preferable to fill the gas at a pressure of 56 cmHg or less at room temperature.

In addition, dimples may be formed in several places as necessary.
As shown in FIG. 2, dimples can be formed at the same time by preparing a required number of two gas burners and arranging them at predetermined positions.

Further, as described in the third claim, one dimple is first formed using one burner, and the other dimple is formed by moving this burner in parallel in the axial direction of the tubular valve l. However, similar dimples can be formed. Also at this time, it is preferable to prepare as many gas burners as necessary.

〔Effect of the invention〕

As explained above, the incandescent light bulb with dimples of the present invention has
The ring anchor can be held securely and the bulb will not be cracked, and according to the method for manufacturing a dimpled incandescent light bulb of the present invention, the dimpled incandescent light bulb can be made to hold the ring anchor between a pair of dimples. It is possible to produce incandescent light bulbs reliably and quickly.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of the incandescent light bulb with dimples of the present invention,
Fig. 2 is an explanatory diagram of an embodiment showing the positional relationship between a tube-type incandescent lamp and a gas burner when manufacturing the dimpled incandescent lamp of the present invention, and Fig. 3 shows the gas filling pressure and the depth of the dimples formed. Figure 4 is a diagram showing the relationship between the gas filling pressure and the difference in the depth of dimples formed in the first and second rounds, Figure 5 is for explaining the tube type incandescent light bulb. The sectional view and FIG. 6 are explanatory diagrams showing a state in which the ring anchor is fixed in position by a conventional dimple. l... Pipe valve 13.14.15 - Dimple 2 - Filament 2 Tring anchor 2L - Ring anchor 30 - Burner 31 - Flame 1 Figure 1 and Figure Figure Figure Figure Insertion pressure (cmHg )

Claims (1)

[Scope of Claims] 1) A dimpled incandescent light bulb in which a ring anchor for holding a filament is fixed in position by dimples formed in a tube-shaped bulb, the dimples having two parts arranged so as to sandwich the ring anchor.
The distance between the pair of dimples is 5.5±0.5mm, and the depth of the dimples is 1.2±0.
An incandescent light bulb with dimples, characterized in that the diameter is 3 mm, and the outer tube shape of a tube-type bulb remains between the pair of dimples. 2) The axis of the flame emitted from two gas burners placed close to each other in parallel is intersected with the pipe valve, and the ring anchor is placed approximately in the middle of the outer flames of the two flames. A method for manufacturing an incandescent light bulb with dimples, comprising arranging the two gas burners to form the pair of dimples according to claim 1. 3) A first step in which the axis of the flame emitted from the gas burner is shifted by a predetermined distance from the ring anchor and three-dimensionally intersects with the pipe valve to form one dimple, and the axis of the flame is parallel to the ring anchor. A method for manufacturing an incandescent light bulb with dimples, comprising a second step of moving the dimple to similarly form the other dimple, and forming the pair of dimples according to claim 1 through the first and second steps. .