AU662803B2 - A flashlight including two reflecting mirrors for one light source - Google Patents
A flashlight including two reflecting mirrors for one light source Download PDFInfo
- Publication number
- AU662803B2 AU662803B2 AU35108/93A AU3510893A AU662803B2 AU 662803 B2 AU662803 B2 AU 662803B2 AU 35108/93 A AU35108/93 A AU 35108/93A AU 3510893 A AU3510893 A AU 3510893A AU 662803 B2 AU662803 B2 AU 662803B2
- Authority
- AU
- Australia
- Prior art keywords
- reflecting mirror
- reflecting
- light source
- light
- flashlight
- 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.)
- Ceased
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
6628 O
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S): Cateye Co., Ltd.
ADDRESS FOR SERVICE: C CC( C CCC C C CCt.r DAVIES COLLISON CAVE Patent Attorneys 1 Little Collins Street, Melbourne, 3000.
INVENTION TITLE: L,.-ng pparats including two reflecting mirrors for one light source The following statement is a full description of this invention, including the best method of performing it known to me/us:- C t cc...
''7
A-
0 ca e o 44 1 4 C *r C C (Cf C C BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a flashlight which includes a light source and two reflecting mirrors.
Description of the Background Art Fig. 3 is a cross sectional view showing a structure of a conventional flashlight.
Referring to Fig. 3, a conventional flashlight includes a body A 13 protecting a battery housing portion 15, 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 expanding the irradiation range is attached in front of lamp bulb 7.
Fig. 4 is an enlarged cross sectional view showing a structure of and around the lamp bulb and reflecting mirror of the flashlight in Fig. 3.
First, as the reference basis, a line passing through the center of lamp bulb 7 is indicated as an X-Y axis and 950630,Aopcr\gcp,35108.93 1 '7' the position of a filament 9 of lamp bulb 7 is indicated as an origin 0. The front end of reflecting mirror 1 is indicated as C, and the rear end iz indicated as D. Since the structure is symmetric with respect to X-Y axis, only the upper half will hereinafter be described.
In this example, an angle COY is 37.5°, and an angle DOY is 92.40. Luminous flux of filament 9 emitted in the range of the angle COY is directed forward without reflected by reflecting mirror 1. Luminous flux of 10 filament 9 emitted in the range of the angle DOC is reflected by reflecting mirror 1 to be made parallel to the axis OY and directed forward.
Consequently, only the luminous flux in the range of C, CC4 the angle DOY (92.40) emitted from filament 9 is directed 15 forward. A solid angle ANG defined by the range of the luminous flux to be directed forward by reflecting mirror ir 1 is determined as fellows: ANG 5.248 (steradians) Assuming that filament 9 irradiates uniformly all the directions, the utilization efficiency of luminous flux R of reflecting mirror is determined as follows, based on the solid angle ANG: R 41.8% In the conventional flashlight described above, when a lamp bulb in which a filament irradiates backward (which S-2indicates 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 flux should be utilized for forward irradiation. In Fig.
the angle COY is 37.5°, which is the same as in Fig. 4, while the angle DOY is 125.00, whichL is larger than the corresponding angle in Fig. 4. Here, a solid angle ANGi Vc and a utilization efficiency of luminous flux R, of Ct 10 reflecting mirror 1 are determined as follows: ANGi 8.5887 (steradians) RI 68.3%, showing large increase in the utilization efficiency of luminous flux. However, for increasing a utilization 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 It view of a flashlight with the reflecting mirror of Fig. incorporated therein. 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 lighting apparatus with a high utilization efficiency of luminous flux.
SUMMARY OF THE INVENTION One object of the present invention is to increase a -4utilization 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 flashlight, comprising: a light source having a solid angle over 6.28 steradians defined from its irradiation range; a first reflecting mirror for reflecting light emitted from said light source to direct the reflected light forward; and a second 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, characterized in that said second reflecting mirror is formed of transparent material including a reflect reflecting portion having a plurality of rectangular projections formed on the external surface of the second reflecting mirror.
In the lighting apparatus configured 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 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 0( CC c C C i -re 950630,p:\operigcp,351O8.93,4 9T~~ 4u9560,focfc.310.9, accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross sectional view showing a structure of a flashlight according to one embodiment of the present 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 flashlight.
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 around a lamp bulb of a conventional flashlight.
Fig. 6 is a cross sectional view showing a structure of another conventional flashlight with the structure around the lamp bulb of Fig. 5 incorporated thereinto.
DESCRIPTION OF THE PREFERRED EMBODIMENTS 'i Fig. 1 is a cross sectional view showing a structure 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 same as that of the conventional one shown in Fig. 3, the 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 mirror 1 is provided approximately in front of the position of a filament 9 of a lamp bulb 7, and a reflex reflecting portion 5 is provided between reflecting mirror 1 and a socket 11 in which lamp bulb 7 is inserted and fixed thereto.
The structure and function of reflecting mirror 1 to 1C 0 which a fitting piece 3 is connected are basically the same as those of reflecting mirror 1 shown in Fig. 4.
Specifically, an angle COY is 37.50, and an angle DOY is 92.40. Luminous flux emitted from filament 9 in the range of the angle COY is directed forward as it is, while 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 OY and directed forward.
Reflex reflecting portion 5 is a reflector of transparent resin and the like, molded so as to have a plurality of rectangular projections 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 reflex reflecting portion 5 is reflected by an inner surface of the rectangular protruding portion, to be made parallel to OA and directed toward filament 9. The light -6-i 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 forward.
As described above, provision of reflex reflecting portion 5 enables light emitted backward from filament 9 to be utilized as light to be directed forward. In this case, luminous flux in the range of an angle EOY (125.00) is directed forward, and thus its solid angle ANG 2 and its utilization efficiency of luminous flux R 2 of reflecting mirror 1 and reflex reflecting portion 5 are as follows:
ANG
2 8.5887 (steradians) R2 68.3% Consequently, according to the present invention, lighting apparatus having the same L 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 -7to be taken by way of limitation, the spirit and scope of the present invention being limited only by the terms of the appended claims.
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Claims (3)
1. A flashlight, comprising: a light source having a solid angle over 6.28 steradians defined from its irradiation range; a first reflecting mirror for reflecting light emitted from said light source to direct the reflected light forward; and a second 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, characterized in that said second reflecting mirror is formed of transparent material including a reflect reflecting portion having a plurality of rectangular projections formed on the external surface of the second reflecting mirror.
2. The flashlight according to claim 1, wherein said second reflecting mirror includes a spherical mirror. f. A I f i i
3. 1 and A flashlight substantially as hereinbefore described with reference to Figures 2 of the accompanying drawings. C C DATED this 30th day of June, 1995 CATEYE CO., LTD. By its Patent Attorneys DAVIES COLLISON CAVE S( 1 i 950630,pAopcgczP,3510893,9 ABSTRACT OF THE DISCLOSURE 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. r I St ABTAC FTHsICLSR S A elcigmro aigiscosscinoS
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4-12771U | 1992-03-13 | ||
| JP1992012771U JP2601713Y2 (en) | 1992-03-13 | 1992-03-13 | Lighting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3510893A AU3510893A (en) | 1993-09-16 |
| AU662803B2 true AU662803B2 (en) | 1995-09-14 |
Family
ID=11814670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU35108/93A Ceased AU662803B2 (en) | 1992-03-13 | 1993-03-10 | A flashlight 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 |
| US8042968B2 (en) | 2009-11-10 | 2011-10-25 | Lsi Industries, Inc. | Modular light reflectors and assemblies for luminaire |
| US8794787B2 (en) | 2009-11-10 | 2014-08-05 | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2629046A (en) * | 1951-01-03 | 1953-02-17 | Liberman Milton | Lamp supported reflector unit |
| US3443086A (en) * | 1967-05-16 | 1969-05-06 | Giannini Scient Corp | Beam-forming system |
| GB2079435A (en) * | 1980-07-03 | 1982-01-20 | Gen Electric | Reflector lamp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1497305A1 (en) * | 1966-04-29 | 1969-08-07 | Interelectric Ag | Electric lamp with parabolic reflector |
| IT1083262B (en) * | 1977-05-10 | 1985-05-21 | Fiat Spa | REFLECTOR FOR LIGHTING AND OR SIGNALING DEVICE PARTICULARLY FOR VEHICLES |
-
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 EP EP19930103850 patent/EP0560327B1/en not_active Expired - Lifetime
- 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
- 1993-03-12 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
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2629046A (en) * | 1951-01-03 | 1953-02-17 | Liberman Milton | Lamp supported reflector unit |
| US3443086A (en) * | 1967-05-16 | 1969-05-06 | Giannini Scient Corp | Beam-forming system |
| GB2079435A (en) * | 1980-07-03 | 1982-01-20 | Gen Electric | Reflector lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| NZ247086A (en) | 1995-12-21 |
| JPH0575901U (en) | 1993-10-15 |
| AU3510893A (en) | 1993-09-16 |
| EP0560327A2 (en) | 1993-09-15 |
| EP0560327B1 (en) | 1996-02-07 |
| JP2601713Y2 (en) | 1999-12-06 |
| CA2092600A1 (en) | 1993-09-14 |
| DE69301473T2 (en) | 1996-08-14 |
| HK1007185A1 (en) | 1999-04-01 |
| EP0560327A3 (en) | 1993-09-29 |
| CA2092600C (en) | 1996-10-15 |
| DE69301473D1 (en) | 1996-03-21 |
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