CA2092600C - Lighting apparatus including two reflecting mirrors for one light source - Google Patents
Lighting apparatus including two reflecting mirrors for one light sourceInfo
- Publication number
- CA2092600C CA2092600C CA 2092600 CA2092600A CA2092600C CA 2092600 C CA2092600 C CA 2092600C CA 2092600 CA2092600 CA 2092600 CA 2092600 A CA2092600 A CA 2092600A CA 2092600 C CA2092600 C CA 2092600C
- Authority
- CA
- Canada
- Prior art keywords
- light source
- reflecting
- lighting apparatus
- filament
- lamp bulb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0091—Reflectors for light sources using total internal reflection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
- F21L4/00—Electric lighting devices with self-contained electric batteries or cells
- F21L4/005—Electric lighting devices with self-contained electric batteries or cells the device being a pocket lamp
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0025—Combination of two or more reflectors for a single light source
Abstract
A reflecting mirror having its cross section of a parabolic shape is provided approximately in front of a filament of a lamp bulb. A reflex reflecting portion is provided between reflecting mirror and a socket in which lamp bulb inserted. Reflex reflecting portion reflects back emitted light from filament, and then directs the reflected light forward through reflecting mirror.
Description
sACKGRoUND OF THE INVENTION
5 Field of the Invention The present invention relates to lighting apparatus, and particularly to a lighting apparatus such as a flashlig~lt including a light source and reflecting mirrors .
10 DescripLion of the Background Art Fig. 3 is a cross sectional view showing a structure of a conventional f lashlight .
Referring to Fig. 3, a conventional flashlight includes a body A 13 protecting a battery housing portion 15 lS, a battery cover 17 covering a battery housed in housing portion 15, and a body B 21 protecting a lamp bulb 7. In body B 21, a reflecting mirror 1 is attached around lamp bulb 7 for reflecting forward emitted light from lamp bulb 7, and a lens 19 for P~r~nrlin~ the irradiation range 20 is attac}~ed in front of lamp bulb 7.
Fig. 4 is an enlarged cross sectional view showLng a structure of and around t}~e lamp bulb and ref lecting mirror of the f lashlight in Fig . 3 .
First, as the reference basis, a line passing t}lrough 25 the cen~er of lamp bulb 7 is indicated as an X-Y axis and ~26~0 the position of a filament 9 of lamp bulb 7 is indicated as an origin O. The front end of reflecting mirror 1 is indicated as C, and the rear end is indicated as D. Since the structure is symmetric with respect to X-Y axis, only 5 the upper half will hereinafter be descr~bed In this example, an angle COY is 37.5, and an angle DOY is 92.4. Luminous flux of filament 9 emitted in the range of the angle COY is directed forward without ref lected by ref lecting mirror 1. Luminous f lux of 10 filament 9 emitted in the range of the angle DOC is ref lected by ref lecting mirror 1 to be made parallel to the axis OY and directed f orward .
Consequently, only the luminous flux in the range of the angle DOY (92.4o) emitted from filament 9 is directed 15 forward. A solid angle ANG defined by the range of the luminous f lux to be directed f orward by ref lecting mirror 1 is det~ nin~l as follows:
ANG = 5 . 24 8 ( steradians ) Assuming that filament 9 irradiates uniformly all the 20 directions, the utilization efficiency of luminous flux R
of reflecting mirror is determlned as follows, based on the solid angle ANG:
R = 41. 896 In the conventional flashlight described above, when 25 a lamp bulb in which a filament irradiates backward (which 20926oo indicates a light source with a solid angle over 6 . 28 steradians ) is used, it can not be said that the backward luminous flux is effectively utilized.
Fig. 5 shows an example in which backward luminous 5 flux should be utilized for forward irradiation. In Fig.
5, the angle COY is 37.5, which is the same as in Fig. 4, while the angle DOY is 125.0, which is larger than the corresponding angle in Fig. 4. Here, a solid angle ANG
and a utilization efficiency of luminous flux Rl of 0 reflectil~g mirror 1 are determined as follows:
ANGI = 8.5887 (steradians) R~ = 68 . 3~, showing large increase in the utilization efficiency of luminous flux. However, for increasing a utilization 15 efficiency of luminous flux with the angle COY being constant, reflecting mirror 1 must be made larger compared to Fig. 4, as can be seen from Fig. 5 (compare the dimensions L in the figures ) . Fig . 6 is a cross sectional view of a flashlight with the reflecting mirror of Fig. 5 20 incorporated ttlerein. In Fig. 6, the structure around a lamp bulb is considerably larger compared to that in Fig.
3, which can not be lead to a compact lig~lting apparatus with a }ligh utilization efficiency of luminous flux.
One ob ject of Llle present invention is to increase a :,~
-;
utilization efficiency of luminous flux in a lighting apparatus .
Another object of the present invention is to make a lighting apparatus compact while maintaining a utilization efficiency of luminous flux.
According to the present invention there is provided a lighting apparatus comprising a light source having a solid angle over 6.28 steradians defined from its irradiation range; a reflecting mirror for reflecting light emitted from said light source to direct the reflected light forward; and a reflex reflecting mirror provided at least at the back of said light source, for reflecting the light emitted from said light source to direct the reflected light toward said light source.
In the lighting apparatus conf igured as described above, light emitted backward from the light source is reflected by the second reflecting mirror to be directed toward the light source, so that the utilization efficiency of luminous flux can be enhanced while the apparatus is being made compact.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description- of the present invention when taken in conjunction with the ~, ~9~6~
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross sectional view showing a structure of a f lashlight according to one embodiment of the present 5 invention.
Fig. 2 is an enlarged cross sectional view showing a structure around a lamp bulb of Fig. 1.
Fig. 3 is a cross sectional view showing a structure of a conventional f lashlight .
Fig. 4 is an enlarged cross sectional view showing a structure around a lamp bulb of Fig. 3.
Fig. 5 is an enlarged cross sectional view showing another example of a structure arolmd a lamp bulb of a conventional f lashlight .
Fig. 6 is a cross sectional view showing a structure of another conventional f lashlight with the structure around the lamp bulb of Fig. 5 incorporated thereinto.
DESCRIPTION OF T~E PREFERRED EMBODIMENTS
Fig. 1 is a cross sectional view showing a structure 20 of a flashlight according to one embodiment of the present invention, and Fig. 2 is an enlarged cross sectional view of a structure around a lamp bulb and a reflecting mirror of Fig. 1.
Since an exterior portion of the flashlight is the 25 same as that of the conventional one shown in Fig. 3, the 2~
description is not repeated and the structure around a light source will hereinafter be described with reference to Fig. 2.
In the figure, a reflecting mLrror 1 is provided 5 approximately in front of the position of a filament g of a lamp bulb 7, and a ref lex ref lecting portion 5 is provided bet~een ref lecting mirror l and a socket 11 in which lamp bulb 7 is inserted and fixed thereto.
The structure and function of reflecting mlrror 1 to 10 which a fitting piece 3 is connected are basically the same as those Qf ref lecting mirror 1 shown in Fig . 4 .
Specifically, an angle COY is 37.5, and an angle DOY is 92.4. 3~uminous flux emitted from filament 9 in the range of the angle COY is directed forward as it is, while 15 luminous flux emitted from filament 9 in the range of the angle DOC is reflected by reflecting mirror 1 to be made parallel to an axis aY and directed iorward.
Reflex reflecting portion 5 is a reflector of transparent resin and the like, molded so as to have a 20 plurality of rectangular pro ~ections formed on the sphere centered on a filament 9 as shown in the figure. For example, light directed from filament 9 to an A point of ref lex ref lecting portion 5 is ~ef lected by an inner surf ace of the rectangular protruding portion, to be made 25 parallel to OA and directed to~7ard filament 9. The light ~92~
passing near filament 9 is then incident to a B point on the lower surface of reflecting mirror 1 and reflected to be made approximately parallel to the axis OY and directed f orwa rd .
As described above, provision of reflex reflecting portion 5 enables light emitted backward f rom f ilament 9 to be utilized as light to be directed f orward . In this case, luminous flux in the range of an angle EOY (125.0) is directed forward, and thus its solid angle ANG2 and its utilization efficiency of luminous flux Rz of reflecting mirror 1 and reflex reflecting portion 5 are as follows:
ANG2 = 8 . 5 8 8 7 ( s t eradi an s ) Rz = 68.396 Consequently, according to the present invention, lighting apparatus having the same ~ dimension of the reflecting mirror portion as in Figs. 3 and 4 shown as conventional examples, while having the equivalent reflection efficiency to those in Figs. 5 and 6 can be realized.
In the above embodiment, a reflex reflecting portion having a plurality of rectangular steps is provided, while instead, a reflecting element, such as a spherical mirror, may be provided for reflecting back light from filament 9.
Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not 6~
to be taken by way of limitation, the spirit and scope of the present invention beins limited only by the terms of the appended claims.
5 Field of the Invention The present invention relates to lighting apparatus, and particularly to a lighting apparatus such as a flashlig~lt including a light source and reflecting mirrors .
10 DescripLion of the Background Art Fig. 3 is a cross sectional view showing a structure of a conventional f lashlight .
Referring to Fig. 3, a conventional flashlight includes a body A 13 protecting a battery housing portion 15 lS, a battery cover 17 covering a battery housed in housing portion 15, and a body B 21 protecting a lamp bulb 7. In body B 21, a reflecting mirror 1 is attached around lamp bulb 7 for reflecting forward emitted light from lamp bulb 7, and a lens 19 for P~r~nrlin~ the irradiation range 20 is attac}~ed in front of lamp bulb 7.
Fig. 4 is an enlarged cross sectional view showLng a structure of and around t}~e lamp bulb and ref lecting mirror of the f lashlight in Fig . 3 .
First, as the reference basis, a line passing t}lrough 25 the cen~er of lamp bulb 7 is indicated as an X-Y axis and ~26~0 the position of a filament 9 of lamp bulb 7 is indicated as an origin O. The front end of reflecting mirror 1 is indicated as C, and the rear end is indicated as D. Since the structure is symmetric with respect to X-Y axis, only 5 the upper half will hereinafter be descr~bed In this example, an angle COY is 37.5, and an angle DOY is 92.4. Luminous flux of filament 9 emitted in the range of the angle COY is directed forward without ref lected by ref lecting mirror 1. Luminous f lux of 10 filament 9 emitted in the range of the angle DOC is ref lected by ref lecting mirror 1 to be made parallel to the axis OY and directed f orward .
Consequently, only the luminous flux in the range of the angle DOY (92.4o) emitted from filament 9 is directed 15 forward. A solid angle ANG defined by the range of the luminous f lux to be directed f orward by ref lecting mirror 1 is det~ nin~l as follows:
ANG = 5 . 24 8 ( steradians ) Assuming that filament 9 irradiates uniformly all the 20 directions, the utilization efficiency of luminous flux R
of reflecting mirror is determlned as follows, based on the solid angle ANG:
R = 41. 896 In the conventional flashlight described above, when 25 a lamp bulb in which a filament irradiates backward (which 20926oo indicates a light source with a solid angle over 6 . 28 steradians ) is used, it can not be said that the backward luminous flux is effectively utilized.
Fig. 5 shows an example in which backward luminous 5 flux should be utilized for forward irradiation. In Fig.
5, the angle COY is 37.5, which is the same as in Fig. 4, while the angle DOY is 125.0, which is larger than the corresponding angle in Fig. 4. Here, a solid angle ANG
and a utilization efficiency of luminous flux Rl of 0 reflectil~g mirror 1 are determined as follows:
ANGI = 8.5887 (steradians) R~ = 68 . 3~, showing large increase in the utilization efficiency of luminous flux. However, for increasing a utilization 15 efficiency of luminous flux with the angle COY being constant, reflecting mirror 1 must be made larger compared to Fig. 4, as can be seen from Fig. 5 (compare the dimensions L in the figures ) . Fig . 6 is a cross sectional view of a flashlight with the reflecting mirror of Fig. 5 20 incorporated ttlerein. In Fig. 6, the structure around a lamp bulb is considerably larger compared to that in Fig.
3, which can not be lead to a compact lig~lting apparatus with a }ligh utilization efficiency of luminous flux.
One ob ject of Llle present invention is to increase a :,~
-;
utilization efficiency of luminous flux in a lighting apparatus .
Another object of the present invention is to make a lighting apparatus compact while maintaining a utilization efficiency of luminous flux.
According to the present invention there is provided a lighting apparatus comprising a light source having a solid angle over 6.28 steradians defined from its irradiation range; a reflecting mirror for reflecting light emitted from said light source to direct the reflected light forward; and a reflex reflecting mirror provided at least at the back of said light source, for reflecting the light emitted from said light source to direct the reflected light toward said light source.
In the lighting apparatus conf igured as described above, light emitted backward from the light source is reflected by the second reflecting mirror to be directed toward the light source, so that the utilization efficiency of luminous flux can be enhanced while the apparatus is being made compact.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description- of the present invention when taken in conjunction with the ~, ~9~6~
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross sectional view showing a structure of a f lashlight according to one embodiment of the present 5 invention.
Fig. 2 is an enlarged cross sectional view showing a structure around a lamp bulb of Fig. 1.
Fig. 3 is a cross sectional view showing a structure of a conventional f lashlight .
Fig. 4 is an enlarged cross sectional view showing a structure around a lamp bulb of Fig. 3.
Fig. 5 is an enlarged cross sectional view showing another example of a structure arolmd a lamp bulb of a conventional f lashlight .
Fig. 6 is a cross sectional view showing a structure of another conventional f lashlight with the structure around the lamp bulb of Fig. 5 incorporated thereinto.
DESCRIPTION OF T~E PREFERRED EMBODIMENTS
Fig. 1 is a cross sectional view showing a structure 20 of a flashlight according to one embodiment of the present invention, and Fig. 2 is an enlarged cross sectional view of a structure around a lamp bulb and a reflecting mirror of Fig. 1.
Since an exterior portion of the flashlight is the 25 same as that of the conventional one shown in Fig. 3, the 2~
description is not repeated and the structure around a light source will hereinafter be described with reference to Fig. 2.
In the figure, a reflecting mLrror 1 is provided 5 approximately in front of the position of a filament g of a lamp bulb 7, and a ref lex ref lecting portion 5 is provided bet~een ref lecting mirror l and a socket 11 in which lamp bulb 7 is inserted and fixed thereto.
The structure and function of reflecting mlrror 1 to 10 which a fitting piece 3 is connected are basically the same as those Qf ref lecting mirror 1 shown in Fig . 4 .
Specifically, an angle COY is 37.5, and an angle DOY is 92.4. 3~uminous flux emitted from filament 9 in the range of the angle COY is directed forward as it is, while 15 luminous flux emitted from filament 9 in the range of the angle DOC is reflected by reflecting mirror 1 to be made parallel to an axis aY and directed iorward.
Reflex reflecting portion 5 is a reflector of transparent resin and the like, molded so as to have a 20 plurality of rectangular pro ~ections formed on the sphere centered on a filament 9 as shown in the figure. For example, light directed from filament 9 to an A point of ref lex ref lecting portion 5 is ~ef lected by an inner surf ace of the rectangular protruding portion, to be made 25 parallel to OA and directed to~7ard filament 9. The light ~92~
passing near filament 9 is then incident to a B point on the lower surface of reflecting mirror 1 and reflected to be made approximately parallel to the axis OY and directed f orwa rd .
As described above, provision of reflex reflecting portion 5 enables light emitted backward f rom f ilament 9 to be utilized as light to be directed f orward . In this case, luminous flux in the range of an angle EOY (125.0) is directed forward, and thus its solid angle ANG2 and its utilization efficiency of luminous flux Rz of reflecting mirror 1 and reflex reflecting portion 5 are as follows:
ANG2 = 8 . 5 8 8 7 ( s t eradi an s ) Rz = 68.396 Consequently, according to the present invention, lighting apparatus having the same ~ dimension of the reflecting mirror portion as in Figs. 3 and 4 shown as conventional examples, while having the equivalent reflection efficiency to those in Figs. 5 and 6 can be realized.
In the above embodiment, a reflex reflecting portion having a plurality of rectangular steps is provided, while instead, a reflecting element, such as a spherical mirror, may be provided for reflecting back light from filament 9.
Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not 6~
to be taken by way of limitation, the spirit and scope of the present invention beins limited only by the terms of the appended claims.
Claims (2)
1. A lighting apparatus, comprising:
a light source having a solid angle over 6.28 steradians defined from its irradiation range;
a reflecting mirror for reflecting light emitted from said light source to direct the reflected light forward; and a reflex reflecting mirror provided at least at the back of said light source, for reflecting the light emitted from said light source to direct the reflected light toward said light source.
a light source having a solid angle over 6.28 steradians defined from its irradiation range;
a reflecting mirror for reflecting light emitted from said light source to direct the reflected light forward; and a reflex reflecting mirror provided at least at the back of said light source, for reflecting the light emitted from said light source to direct the reflected light toward said light source.
2. The lighting apparatus according to claim 1, wherein said lighting apparatus includes a flashlight.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992012771U JP2601713Y2 (en) | 1992-03-13 | 1992-03-13 | Lighting equipment |
| JP4-12771 | 1992-03-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2092600A1 CA2092600A1 (en) | 1993-09-14 |
| CA2092600C true CA2092600C (en) | 1996-10-15 |
Family
ID=11814670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2092600 Expired - Fee Related CA2092600C (en) | 1992-03-13 | 1993-03-12 | Lighting apparatus including two reflecting mirrors for one light source |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0560327B1 (en) |
| JP (1) | JP2601713Y2 (en) |
| AU (1) | AU662803B2 (en) |
| CA (1) | CA2092600C (en) |
| DE (1) | DE69301473T2 (en) |
| HK (1) | HK1007185A1 (en) |
| NZ (1) | NZ247086A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6454433B1 (en) | 2001-05-24 | 2002-09-24 | Eveready Battery Company, Inc. | Dual faceted reflector |
| US7828456B2 (en) | 2007-10-17 | 2010-11-09 | Lsi Industries, Inc. | Roadway luminaire and methods of use |
| US8794787B2 (en) | 2009-11-10 | 2014-08-05 | Lsi Industries, Inc. | Modular light reflectors and assemblies for luminaire |
| US8042968B2 (en) | 2009-11-10 | 2011-10-25 | Lsi Industries, Inc. | Modular light reflectors and assemblies for luminaire |
| DE202016101305U1 (en) | 2016-03-09 | 2016-05-06 | Zweibrüder Optoelectronics Gmbh & Co. Kg | reflector system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2629046A (en) * | 1951-01-03 | 1953-02-17 | Liberman Milton | Lamp supported reflector unit |
| DE1497305A1 (en) * | 1966-04-29 | 1969-08-07 | Interelectric Ag | Electric lamp with parabolic reflector |
| US3443086A (en) * | 1967-05-16 | 1969-05-06 | Giannini Scient Corp | Beam-forming system |
| IT1083262B (en) * | 1977-05-10 | 1985-05-21 | Fiat Spa | REFLECTOR FOR LIGHTING AND OR SIGNALING DEVICE PARTICULARLY FOR VEHICLES |
| GB2079435B (en) * | 1980-07-03 | 1984-05-23 | Gen Electric | Reflector lamp |
-
1992
- 1992-03-13 JP JP1992012771U patent/JP2601713Y2/en not_active Expired - Fee Related
-
1993
- 1993-03-09 NZ NZ24708693A patent/NZ247086A/en unknown
- 1993-03-10 DE DE1993601473 patent/DE69301473T2/en not_active Expired - Fee Related
- 1993-03-10 AU AU35108/93A patent/AU662803B2/en not_active Ceased
- 1993-03-10 EP EP19930103850 patent/EP0560327B1/en not_active Expired - Lifetime
- 1993-03-12 CA CA 2092600 patent/CA2092600C/en not_active Expired - Fee Related
-
1998
- 1998-06-24 HK HK98106412A patent/HK1007185A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE69301473D1 (en) | 1996-03-21 |
| AU662803B2 (en) | 1995-09-14 |
| NZ247086A (en) | 1995-12-21 |
| HK1007185A1 (en) | 1999-04-01 |
| AU3510893A (en) | 1993-09-16 |
| CA2092600A1 (en) | 1993-09-14 |
| JP2601713Y2 (en) | 1999-12-06 |
| DE69301473T2 (en) | 1996-08-14 |
| EP0560327A3 (en) | 1993-09-29 |
| EP0560327B1 (en) | 1996-02-07 |
| EP0560327A2 (en) | 1993-09-15 |
| JPH0575901U (en) | 1993-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |