Lamp

Description

BACKGROUND OF THE INVENTION

This invention relates to a lamp comprising at least one lead rod and a plurality of filaments.

SUMMARY OF THE INVENTION

Heretofore, spotlighting at a studio and a stage or the like has been performed by combining a halogen lamp with a reflector in general.

FIG. 9

is a view showing a conventional example of a halogen lamp for the studio. This halogen lamp

100

comprises a base

101

and a glass tube

102

is provided on the upper of this base

101

. Two pieces of lead rod

105

fixed by two pieces of glass piece

103

and

104

are arranged on the inside of the glass tube

102

. The glass piece

103

fixes the upper end of two pieces of lead rod

105

and another glass piece

104

fixes the central portion of two pieces of lead rod

105

. Moreover, a plurality of filaments

106

connected to each other in series is arranged between the glass pieces

103

and

104

. These plurality of filaments

106

are supported by a support

108

, and both ends

106

a

of these plurality of filaments

106

connected each other in series are connected with windings

107

wound in the form of a coil. The windings

107

are welded in the condition of being passed through the lead rods

105

, thereby electrically connects a plurality of filaments

106

with the lead rod

105

. When attaching the reflecting mirror to the halogen lamp

100

having a structure shown in FIG.

9

and using this halogen lamp

10

, there has been a problem that the light emitted from the filament

106

is shut off by the lead rod

105

, so that lack of uniformity of luminous intensity distribution are caused.

The object of the invention is to provide a lamp capable of suppressing lack of uniformity of luminous intensity distribution.

The present invention is characterized in that the plurality of filaments is arranged around said lead rod. When arranging a plurality of filaments around the lead rod, the light emitted from the filaments is irradiated approximately uniformly toward the surroundings of the lamp without being shut off by the lead rod, whereby lack of uniformity of luminous intensity distribution can be suppressed.

Here, the lamp according to the invention preferably comprises a plurality of filament structure elements, each of the filament structure elements having the plurality of filament, and the lamp comprises a plurality of the lead rod, wherein one of the plurality of the lead rod connects each of the plurality of filament structure elements. Vibration resistance of a lamp can be improved by connecting each of a plurality of the filament structure elements to the one lead rod.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments according to the invention will be described below, in which

FIG. 1

is a view showing a lamp of a first embodiment according to this invention;

FIG. 2

is a sectional view of

FIG. 1

, the

FIG. 1

being viewed from a direction of line A-A′;

FIG. 3

is a front elevation showing a stem;

FIG. 4

is a side elevation of the stem shown in

FIG. 3

, the stem being viewed from the right side;

FIG. 5

is a view showing a filament structure;

FIG. 6

is a front elevation showing a condition which two pieces of filament structure elements

13

are fixed to the stem;

FIG. 7

is a side elevation of the stem, the stem being viewed from the side of the filament structure element

13

fixed to the side of the lead rod

8

;

FIG. 8

is a view showing a lamp of a second embodiment according to this invention;

FIG. 9

is a view showing a conventional example of a halogen lamp for the studio.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1

is a view showing a lamp of a first embodiment according to this invention, and

FIG. 2

is a sectional view of

FIG. 1

being viewed from a direction of line A-A′. This lamp

1

comprises the base

2

and the glass tube

3

is provided on the upper of this base

2

. The base

2

is attached to one end of the glass tube

3

and a small-diameter tube

3

a

is formed at a center of the other end of this glass tube

3

. Moreover, a stem (refer to FIG.

3

and

FIG. 4

which will be described below) constituted by parts such as three pieces of lead rod

6

,

7

and

8

is provided, and furthermore, two pieces of filament structure elements

13

(refer to

FIG. 5

) are provided on the inside of the glass tube

3

as shown in FIG.

2

. Each of two pieces of filament structure elements

13

has three pieces of filament

13

a

,

13

b

and

13

c

. Since a piece of filament structure element

13

has three pieces of filament

13

a

,

13

b

and

13

c

, six pieces of filament

13

a

,

13

b

and

13

c

in total are arranged within the glass tube

3

. Therefore, this lamp

1

is the lamp having six sections of filament structure. These six pieces of filament

13

a

,

13

b

and

13

c

are arranged in a manner to surround three pieces of lead rod

6

,

7

and

8

. Moreover, in

FIG. 1

, two filaments of three filaments provided for each of filament structure elements

13

are illustrated, and one remaining filament is not shown since the remaining filament hides behind the back of the lead rod

7

and

8

.

FIG. 3

is a front view of a stem, and

FIG. 4

is a side view of the stem shown in

FIG. 3

, the stem being viewed from the right side. The stem is constituted by two pieces of the glass pieces

4

and

5

, three pieces of the lead rod

6

,

7

and

8

, and four pieces of support

9

,

10

,

11

and

12

. Three pieces of the lead rod

6

,

7

and

8

are fixed by two pieces of glass piece

4

and

5

. The centered lead rod

6

of these three pieces of lead rod

6

,

7

and

8

is fixed so as to project to the upper slightly than other lead rods

7

and

8

. Moreover, two supports

9

and

10

are attached to the glass piece

4

and two supports

11

and

12

are attached to the other glass piece

5

. The supports

9

and

11

(which are attached to the left of the glass pieces

4

and

5

) of these four pieces of support

9

,

10

,

11

and

12

are protruded to the opposite side each other with respect to the lead rod

8

as shown in FIG.

4

. Moreover, the supports

10

and

12

attached to the right of the glass pieces

4

and

5

are also protruded to the opposite side each other with respect to the lead rod

8

as shown in FIG.

4

. Moreover, two pieces of the lead rod

7

and

8

of three pieces of the lead rod

6

,

7

and

8

are connected with the base

2

, and the remaining lead rod

6

is for connecting two pieces of filament structure element

13

each other. Two pieces of filament structure elements

13

are attached to the stem composed as described above.

FIG. 5

is a view showing a filament structure element. As shown in

FIG. 5

, the filament structure element

13

comprises three pieces of filament

13

a

,

13

b

, and

13

c

and two windings

13

d

and

13

e

wound in the form of a coil. Three filaments

13

a

,

13

b

and

13

c

are connected each other in series by connecting wires

13

f

and

13

g

. Windings

13

d

and

13

e

are connected to the filaments

13

a

and

13

c

by a connecting wire

13

h

. This filament structure element

13

is formed by coiling a piece of tungsten single wire such that three pieces of filament

13

a

,

13

b

and

13

c

and two windings

13

d

and

13

e

are formed. Two pieces of filament structure elements

13

having such structure are fixed between the glass pieces

4

and

5

. One filament structure element

13

of two filament structure elements

13

is fixed to the side of the lead rod

8

with respect to the centered lead rod

6

(refer to FIG.

2

), and the other filament

13

is fixed to the side of the lead rod

7

. How to fix two pieces of filament structure elements

13

between the glass pieces

4

and

5

will be described below.

FIG. 6

is a front elevation showing a condition which two pieces of filament structure elements

13

are fixed to the stem.

FIG. 7

is a side elevation of this stem, the stem being viewed from the side of the filament structure element

13

fixed to the side of the lead rod

8

. In the filament structure element

13

fixed to the side of the lead rod

8

, the bottom side winding

13

d

of the windings

13

d

and

13

e

is welded in the condition of being passed through the centered lead rod

6

of three pieces of lead rod

6

,

7

and

8

, and the upper side winding

13

e

is welded in the condition of being passed through the right side lead rod

8

. Furthermore, with respect to the connecting wires

13

f

and

13

g

connecting three filaments

13

a

,

13

b

and

13

c

in series, the one connecting wires

13

f

connecting the filaments

13

a

and

13

b

is hooked to the support

10

(refer to

FIG. 4

) attached to the glass piece

4

, and the other connecting wire

13

g

is hooked to the support

12

(refer to

FIG. 4

) attached to the glass piece

5

.

As shown in

FIG. 7

, these support

10

and

12

are protruded to the opposite side each other with respect to the lead rod

8

. Therefore, when each of the connecting wires

13

f

and

13

g

connecting three filaments

13

a

,

13

b

and

13

c

is hooked to each of the support

10

and

12

as mentioned above, these three filaments

13

a

,

13

b

and

13

c

are attached in the condition that the filaments

13

a

and

13

c

are arranged on both sides of the filaments

13

b

. At this point of time, as shown in

FIG. 2

, these three filaments

13

a

,

13

b

and

13

c

are arranged so as to surround the lead rod

8

from a direction of 180 degree. On the one hand, in the filament structure element

13

fixed to the side of the lead rod

7

, the upper side winding

13

e

of the windings

13

d

and

13

e

is welded in the condition of being passed through the centered lead rod

6

of three pieces of lead rod

6

,

7

and

8

, and the bottom side winding

13

d

is welded in the condition of being passed through the left side lead rod

7

. Furthermore, with respect to the connecting wires

13

f

and

13

g

, the one connecting wires

13

f

connecting the filaments

13

a

and

13

b

is hooked to the support

9

(refer to

FIG. 4

) attached to the glass piece

4

, and the other connecting wire

13

g

is hooked to the support

11

(refer to

FIG. 4

) attached to the glass piece

5

. As shown in

FIG. 7

, these support

9

and

11

are protruded to the opposite side each other with respect to the lead rod

6

. Therefore, when each of the connecting wires

13

f

and

13

g

connecting three filaments

13

a

,

13

b

and

13

c

is hooked to each of the support

9

and

11

as mentioned above, these three filaments

13

a

,

13

b

and

13

c

are attached so as to surround the lead rod

7

from a direction of 180 degree in the condition that the filaments

13

a

and

13

c

are arranged on both sides of the filaments

13

b

, as shown in FIG.

2

. Therefore, as shown in

FIG. 2

, the filaments

13

a

,

13

b

and

13

c

provided for each of two filament structure elements

13

are arranged so as to surround three pieces of lead rod from a direction of 360 degrees. Moreover, two pieces of filament structure elements

13

are connected each other in series by the lead rod

6

. In the lamp constituted as described above, the filaments

13

a

,

13

b

and

13

c

are arranged outside the lead rod

6

,

7

and

8

, and no other member exists between the filaments

13

a

,

13

b

and

13

c

and the glass tube

3

. Therefore, the light emitted from the filaments

13

a

,

13

b

and

13

c

is irradiated uniformly without being shut off by other members, whereby lack of uniformity of luminous intensity distribution can be suppressed. Moreover, as shown in

FIG. 1

, the stem provided with the filament structure element

13

is arranged in the glass tube

3

in the condition that a tip portion

6

a

of the lead rod

6

is inserted into the small-diameter tube

3

a

. In the case that the small-diameter tube

3

a

is formed on the glass tube

3

in advance as described above, this small-diameter tube

3

a

serves as a mark for positioning the tip portion

6

a

of the lead rod

6

when arranging the stem in the glass tube

3

, whereby positioning of various parts such as the filament can be performed accurately. Moreover, two pieces of the filament structure element

13

having three pieces of filament

13

a

,

13

b

and

13

c

are provided in order to form the lamp of the filament structure having six sections in this embodiment, and these filament structure elements

13

are connected by the lead rod

6

. As described above, when separate filament structure elements

13

are connected by the lead rod

6

to form the lamp of the filament structure having six sections, vibration resistance of a lamp can be improved as compared with the lamp of the filament structure having six sections constituted by providing a piece of filament structure element with six filaments.

FIG. 8

is a view showing a lamp of a second embodiment according to this invention. Moreover, in the following description of the lamp of the second embodiment shown in

FIG. 8

, those components identical with those of the lamp of first embodiment shown in

FIG. 1

are indicated by the same reference numerals, respectively, and only those points different from the lamp of the first embodiment shown in

FIG. 1

will be described. The difference between the lamp in the second embodiment shown in FIG.

8

and the lamp in the first embodiment shown in

FIG. 1

is that all three pieces of lead rod

6

,

7

and

8

are rodlike in the lamp shown in

FIG. 1

, whereas a centered lead rod

61

of three pieces of lead rod

7

,

8

and

61

has a form of U-shape in the lamp shown in FIG.

8

. This lead rod

61

is arranged such that a bent portion

61

a

is inserted into the small-diameter tube

3

a

. As described above, this invention should not be mentioned for a form of a lead rod, and the filaments are arranged outside the lead rods, whereby the light emitted from the filaments is irradiated uniformly, and lack of uniformity of luminous intensity distribution can be suppressed. Moreover, although the lamp having six filaments has been described in the first embodiment and the second embodiment, the number of filament should not be limited to six pieces in this invention. With respect to lamp which needs a plurality of filaments (for example, four pieces), what the plurality of filaments are arranged around the lead rod can suppress lack of uniformity of luminous intensity distribution. Moreover, although the filaments

13

a

,

13

b

and

13

c

are single windings in the first embodiment and the second embodiment, these may be non-windings, or may be duplex windings.

Claims

1. A lamp comprising at least one lead rod and a plurality of filaments, wherein the plurality of filaments is arranged around the lead rod so that each lead rod has two filaments located on essentially diametrically opposite sides thereof and wherein groups of three filaments are arranged so that each of the three filaments is located at a point of a triangle which lies on a plane which is normal to and intersective with the lead rod.
2. A lamp as claimed in claim 1, wherein the lamp comprises a plurality of filament structure elements, each of the filament structure elements having the plurality of filaments, and wherein the lamp comprises a plurality of the lead rods, wherein one of the plurality of the lead rods is connected to each of the plurality of filament structure elements.
3. A lamp as claimed in claim 1, wherein at least a predetermined number of the plurality of filaments are serially connected.
4. A lamp as claimed in claim 3, further comprising a plurality of support wires which have hook portions which each hook a portion of a single wire from which the predetermined number of serially connected filaments are formed and which is between two of the serially connected filaments.
5. A lamp as claimed in claim 2, further comprising windings which are wound from a single wire from which the predetermined number of serially connected filaments are formed, and which are located at each end of the single wire.
6. A lamp as claimed in claim 1, comprising a single wire, the single wire being wound at a number of locations to form a number of the serially connected filaments and further wound to form a winding at each end.
7. A lamp as claimed in claim 6, wherein the winding at each end of the single wire from which serially connected filaments are formed, is axially displaced with respect to the serially connected filaments, so that each winding is located closer to a glass piece that connects the lead rods than the serially connected filaments.

Priority Claims (1)

Number	Date	Country	Kind
11/335571	Nov 1999	JP

PCT Information

Filing Document	Filing Date	Country	Kind
PCT/EP00/11695		WO	00

Publishing Document	Publishing Date	Country	Kind
WO01/43164	6/14/2001	WO	A

US Referenced Citations (12)

Number	Name	Date	Kind
3555338	Scoledge et al.	Jan 1971	A
3622832	Schlessel et al.	Nov 1971	A
3909653	Bottone et al.	Sep 1975	A
3986067	De Fraeye	Oct 1976	A
4145630	DeCaro et al.	Mar 1979	A
4311940	Fitzgerald et al.	Jan 1982	A
4317060	Fitzgerald et al.	Feb 1982	A
4366411	Robinson	Dec 1982	A
4553066	Fields et al.	Nov 1985	A
4658180	Ooms	Apr 1987	A
4823048	Ooms	Apr 1989	A
5900696	Buschmann et al.	May 1999	A

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

CPC

US Classifications

Field of Search

US

International Classifications

Term Extension

Abstract

Description

Claims

Priority Claims (1)

PCT Information

US Referenced Citations (12)