WO2012060777A4 - Lamp cover for a flash unit - Google Patents

Lamp cover for a flash unit Download PDF

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Publication number
WO2012060777A4
WO2012060777A4 PCT/SG2011/000384 SG2011000384W WO2012060777A4 WO 2012060777 A4 WO2012060777 A4 WO 2012060777A4 SG 2011000384 W SG2011000384 W SG 2011000384W WO 2012060777 A4 WO2012060777 A4 WO 2012060777A4
Authority
WO
WIPO (PCT)
Prior art keywords
lamp cover
zones
fresnel
optical
lamp
Prior art date
Application number
PCT/SG2011/000384
Other languages
French (fr)
Other versions
WO2012060777A3 (en
WO2012060777A2 (en
Inventor
Jianghong Zhou
Original Assignee
Xenon Technologies Pte. Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xenon Technologies Pte. Ltd. filed Critical Xenon Technologies Pte. Ltd.
Priority to SG2013033840A priority Critical patent/SG190115A1/en
Priority to TW101103469A priority patent/TW201317698A/en
Publication of WO2012060777A2 publication Critical patent/WO2012060777A2/en
Publication of WO2012060777A3 publication Critical patent/WO2012060777A3/en
Publication of WO2012060777A4 publication Critical patent/WO2012060777A4/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The present application provides a lamp cover (202, 278, 346, 358, 386, 394) for closing a window (43) of a flash unit (200, 276). The lamp cover (202, 278, 346, 358, 386, 394) comprises a first array of optical zones (254, 330, 347, 361, 388, 390, 392, 396) that are contiguously connected to each other on a surface (63) of the lamp cover (202, 278, 346, 358, 386, 394). One or more of the optical zones (202, 278, 346, 358, 386, 394) have a pitch (255, 342, 362) of 0.07 millimeter at most for visually blurring objects (34, 36, 38, 44, 48, 54, 56) placed behind the lamp cover (202, 278, 346, 358, 386, 394). The application also provides a method for making or using the flash unit (200, 276), which comprises a step of sealing the window (43) with the lamp cover (202, 278, 346, 358, 386, 394). The application further provides a method for making the lamp cover (202, 278, 346, 358, 386, 394), which comprises a step of injecting a molten optical plastic material into a mould insert (262) for providing optical zones (254, 330, 347, 361, 388, 390, 392, 396) or Fresnel zones (254, 330, 347, 361, 388, 390, 392, 396) and a step of detaching the lamp cover (202, 278, 346, 358, 386, 394) from the mould insert (262).

Claims

AMENDED CLAIMS
received by the International Bureau on 23 August 2012 (2308.12)
1. A lamp cover (202, 278, 346, 358, 386, 394) for a flash unit (200, 276), the lamp cover formed from a mainly transparent material, comprising:
a first array of optical zones (254, 330, 347, 361 , 388, 390, 392, 396) on a surface (63) of the lamp cover (386, 394),
the optical zones (254, 330, 347, 361 , 388, 390, 392, 396) having a pitch (255, 342, 352) smaller than 0.07 millimeter, the pitch establishing an optical effect that obscures a view of functional components (34, 36, 38, 44, 48, 54, 56) positioned behind the lamp cover (202, 278, 346, 358, 386, 394).
2. The lamp cover (202, 278, 346, 358, 386, 394) of claim 1 , wherein
the optical effect includes transforming an appearance of the mainly transparent material from a transparent appearance to an opaque appearance.
3. The lamp cover (202, 278, 346, 358, 386, 394) of claim 1 or claim 2, wherein at least one of the optical zones (254, 330, 347, 361 , 388, 390, 392, 396) includes a Fresnel zone (254, 330, 361 , 388, 390, 392, 396) having an equivalent profile (258, 334, 356, 364) is aspheric.
The lamp cover (202, 278, 346, 358, 386, 394) of claim 3, wherein
the equivalent profile (258, 334, 356, 364) is defined by a sag equation in the form of a,r + 2r2 + 3r3 + a4 + a5rs + a6r6 + αΊτΊ + 8r8
Figure imgf000003_0001
wherein an optic axis (46) of the equivalent profile (258, 334, 356, 364) lies in a Z -axis (46) direction such that z(r) includes a sag component of the equivalent profile (258, 334, 356, 364) from a vertex (153) at a distance (138, 152) from the 2 -axis (46); and coefficients n (t = 1,2,3,... as natural numbers) includes an expansion of the equivalent profile (258, 334, 356, 364) from an axially symmetric quadric aspheric equivalent profile (258, 334, 356, 364) specified by constants 5 and κ .
47 The lamp cover (202, 278, 346, 358, 386, 394) of claim 3 or claim 4, wherein the equivalent profile (258, 334, 356, 364) includes a convex portion (336, 368, 370).
The lamp cover (202, 278, 346, 358, 386, 394) of any of the claims 3 to 5, wherein
the equivalent profile (258, 334, 356, 364) includes a concave portion (338, 340, 366).
The lamp cover (202, 278, 346, 358, 386, 394) of claim 6, wherein
the concave portion (338, 340, 366) is near a central area (259) of Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396) and the convex portion (336, 368, 370) is near an end area (341 , 343) of Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396).
The lamp cover (202, 278, 346, 358, 386, 394) of claim 6, wherein
the convex portion (336, 368, 370) is positioned near a central area (259) of Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396) and the concave portion (338, 340, 366) is positioned near an end area (341 , 343) of Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396).
The lamp cover (202, 278, 346, 358, 386, 394) of any of the claims 3 8, wherein
some of the Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396) has a pitch (255, 342, 362) of 0.04 millimeter at most.
The lamp cover (202, 278, 346, 358, 386, 394) of claim 9, wherein
the some of the Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396) have a pitch (362) of 0.01 millimeter at most.
The lamp cover (202, 278, 346, 358, 386, 394) of any of the claims 3 to 10, wherein
an equivalent radius (r ) (138, 152) of the equivalent profile (254, 330, 347, 361 , 388, 390, 392, 396) is less than 5 millimeter.
12. The lamp cover (202, 278, 346, 358, 386, 394) of any of the claims 3 to 11, wherein
at least some of the Fresnel zones (254, 330, 347, 361 , 388, 390, 392, 396) include a linear Fresnel zone (254, 330, 347, 361 , 390, 392).
13. The lamp cover (202, 278, 346, 358, 386, 394) of any of the claims 3 to 12, wherein
at least some of the Fresnel zones (254, 330, 347, .361 , 388, 390, 392, 396) include a curved Fresnel zone (388, 396).
14. The lamp cover (202, 278, 346, 358, 386, 394) of claim 13, wherein
the curved Fresnel zone (388, 396) includes a circular Fresnel zone (388, 396). 15. The lamp cover (202, 278, 346, 358, 386, 394) of claim 1 or claim 2, wherein some of the optical zones (254, 330, 347, 361 , 388, 390, 392, 396) are provided on an internal surface (63) of the lamp cover (386, 394).
16. The lamp cover (202, 278, 346, 358, 386, 394) of any of the claims 1 , 2 and 15, further comprising
a second array of optical zones (254, 330, 347, 361 , 388, 390, 392, 396).
17. The lamp cover (202, 278, 346, 358, 386, 394) of claim 16, wherein
the first array of optical zones (254, 330, 347, 361, 388, 390, 392, 396) and the second array of optical zones (254, 330, 347, 361, 388, 390, 392, 396) are provided on opposite surfaces (63, 64) of the lamp cover (202, 278, 346, 358, 386, 394) respectively.
18. The lamp cover (202, 278, 346, 358, 386, 394) of claim 1 , wherein
mainly transparent material includes an optical plastic material for injection molding.
19. Flash unit (200, 276) having
a flash lamp (34) for generating artificial flash light, a casing (42) enclosing the flash lamp (34), the casing (42) further comprising a window (43) for emitting the artificial light, and
the lamp cover (202, 278, 346, 358, 386, 394) according to any of the preceding claims for fitting onto the window (43).
Portable electronic device having
the flash unit (200, 276) of claim 19.
Method for making the flash unit (200, 276) of claim 19 comprising
sealing a window (43) of a casing (42) with the lamp cover (202, 278, 346, 358,
386, 394) according to any of the preceding claims.
Method for making the lamp cover (202, 278, 346, 358, 386, 394) according to any of the claims 1 to 18 comprising
injecting a molten optical plastic material into a mould insert (262) for providing Fresnel zones (254, 330, 347, 361, 388, 390, 392, 396) of the lamp cover (202, 278, 346, 358, 386, 394), and
detaching the lamp cover (202, 278, 346, 358, 386, 394) from the mould insert (262).
PCT/SG2011/000384 2010-11-03 2011-10-28 Lamp cover for a flash unit WO2012060777A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SG2013033840A SG190115A1 (en) 2010-11-03 2011-10-28 Lamp cover for a flash unit
TW101103469A TW201317698A (en) 2011-10-28 2012-02-02 Lamp cover for a flash unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG2010080893A SG180059A1 (en) 2010-11-03 2010-11-03 Flash unit having a micro fresnel lens
SG201008089-3 2010-11-03

Publications (3)

Publication Number Publication Date
WO2012060777A2 WO2012060777A2 (en) 2012-05-10
WO2012060777A3 WO2012060777A3 (en) 2012-09-27
WO2012060777A4 true WO2012060777A4 (en) 2012-10-18

Family

ID=46024986

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2011/000384 WO2012060777A2 (en) 2010-11-03 2011-10-28 Lamp cover for a flash unit

Country Status (2)

Country Link
SG (2) SG180059A1 (en)
WO (1) WO2012060777A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI653495B (en) * 2014-06-26 2019-03-11 荷蘭商皇家飛利浦有限公司 Led lighting unit
US10009527B2 (en) 2014-06-26 2018-06-26 Philips Lighting Holding B.V. Compact LED lighting unit for use in camera or video flash applications

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6955449B2 (en) * 2001-04-13 2005-10-18 Gelcore Llc LED symbol signal
JP2007073469A (en) * 2005-09-09 2007-03-22 Minebea Co Ltd Planar illuminator and light source unit using same
JP2008218186A (en) * 2007-03-05 2008-09-18 Mitsubishi Electric Corp Luminaire
TWI431328B (en) * 2008-12-26 2014-03-21 Canon Kk Fresnel lens and injection mold
KR100972983B1 (en) * 2009-01-09 2010-07-29 삼성엘이디 주식회사 Camera flash lens and portable device including the same
JP2010197919A (en) * 2009-02-27 2010-09-09 Takiron Co Ltd Optical sheet and backlight unit using the same

Also Published As

Publication number Publication date
SG190115A1 (en) 2013-07-31
WO2012060777A3 (en) 2012-09-27
SG180059A1 (en) 2012-05-30
WO2012060777A2 (en) 2012-05-10

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