GB2042204A - Magnifying mirror comprising Fresnel lens - Google Patents

Magnifying mirror comprising Fresnel lens Download PDF

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Publication number
GB2042204A
GB2042204A GB7905670A GB7905670A GB2042204A GB 2042204 A GB2042204 A GB 2042204A GB 7905670 A GB7905670 A GB 7905670A GB 7905670 A GB7905670 A GB 7905670A GB 2042204 A GB2042204 A GB 2042204A
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GB
United Kingdom
Prior art keywords
mirror
fresnel lens
magnifying
mirrors
reflecting
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.)
Withdrawn
Application number
GB7905670A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB7905670A priority Critical patent/GB2042204A/en
Publication of GB2042204A publication Critical patent/GB2042204A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

A magnifying mirror is produced by the combination of a flat mirror 1 and a Fresnel lens 4 applied to or arranged closely adjacent its surface. The other side of the mirror may be used as a normal flat mirror. As shown the mirror 1 having a silvered or aluminised surface 2 and the Fresnel lens 4 are held together using a spacer 3 and rim 5. <IMAGE>

Description

SPECIFICATION Magnifying mirror This invention relates to magnifying mirrors, such as make-up or shaving mirrors.
The usual form of such mirrors is to make them spherically concave with a focal length of about 3 or 4feet. Such mirrors are relatively expensive.
According to the onvention a magnifying mirror compises in combination a flat mirror and, extending over its surface, a Fresnel lens. This has the effect of a concave mirror in that it produces a magnified image.
In one form of the invention the Fresnel lens is associated with that side of the mirror to which the reflecting material is applied. In this way the combination provides a magnified image on one side, while protecting the mirror surface, and a plain image on the other side.
In a further form of yhe invention the mirror is made of plastics material and has the mirror surface on one side, while the other side is moulded to form the Fresnel lens.
Other features will appear from the following description of an example of the invention with reference to the accompanying drawing which is a cross section of a mirror according to the invention in which some of the features have been exaggerated for the sake of clarity.
In the drawing a plain mirror 1 is made of transparent plastics material such as an acrylic resin, and has a silvered or aluminised surface indicated at 2. A spacer 3 is applied to the edge of the mirror 1 or is moulded integrally with it or with a Fresnel lens 4 which is arranged over the reflecting surface 2.
The lens 4 is composed of a large number of annular prismatic surfaces, as shown, but in the drawing the size of these has been grossly exaggerated and their number reduced in orderthatthey should be visible. The whole assembly of mirror 1, spacer 3 and Fresnel lens 4 is held together by a rim 5 of metal or plastics material which is rolled on or shrunk on as the case may be, or may be welded.
The surface grooves that form the Fresnel lens may be directed outwardly, or, as shown, inwardly in which case they are protected from damage or accumulations of dirt. Similarly the reflecting surface of the mirror 1 is also protected by the Fresnel lens.
The assembly thus provides a light weight and inexpensive structure which may be used, for example, for make-up or for shaving, the focal length of the Fresnel lens being appropriately chosen in each case to give rise to a magnified image of suitable size.
1. A magnifying mirror comprising in combination a flat mirror, and extending over its reflecting area, a Fresnel lens.
2. A mirror according to claim 1 wherein the Fresnel lens is of such focal length as to make tie combination suitable for use as a shaving or makeup mirror.
3. A mirror according to claim 1 or claim 2 wherein the Fresnel lens is applied to that side of the mirror which has the reflecting surface.
4. A mirror according to claim 3 wherein the grooved surface which constitutes the Fresnel lens is spaced away from the adjacent surface of the mirror.
5. A mirror according to any one of the preceding claims wherein the reflecting surface is used as a normal fleat mirror on the side opposite that to which th Fresnel lens is applied.
6. A mirror according to any one of the preceding claims wherein the components are sealed together by a surrounding band of metal or plastics, or by welding.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Magnifying mirror This invention relates to magnifying mirrors, such as make-up or shaving mirrors. The usual form of such mirrors is to make them spherically concave with a focal length of about 3 or 4feet. Such mirrors are relatively expensive. According to the onvention a magnifying mirror compises in combination a flat mirror and, extending over its surface, a Fresnel lens. This has the effect of a concave mirror in that it produces a magnified image. In one form of the invention the Fresnel lens is associated with that side of the mirror to which the reflecting material is applied. In this way the combination provides a magnified image on one side, while protecting the mirror surface, and a plain image on the other side. In a further form of yhe invention the mirror is made of plastics material and has the mirror surface on one side, while the other side is moulded to form the Fresnel lens. Other features will appear from the following description of an example of the invention with reference to the accompanying drawing which is a cross section of a mirror according to the invention in which some of the features have been exaggerated for the sake of clarity. In the drawing a plain mirror 1 is made of transparent plastics material such as an acrylic resin, and has a silvered or aluminised surface indicated at 2. A spacer 3 is applied to the edge of the mirror 1 or is moulded integrally with it or with a Fresnel lens 4 which is arranged over the reflecting surface 2. The lens 4 is composed of a large number of annular prismatic surfaces, as shown, but in the drawing the size of these has been grossly exaggerated and their number reduced in orderthatthey should be visible. The whole assembly of mirror 1, spacer 3 and Fresnel lens 4 is held together by a rim 5 of metal or plastics material which is rolled on or shrunk on as the case may be, or may be welded. The surface grooves that form the Fresnel lens may be directed outwardly, or, as shown, inwardly in which case they are protected from damage or accumulations of dirt. Similarly the reflecting surface of the mirror 1 is also protected by the Fresnel lens. The assembly thus provides a light weight and inexpensive structure which may be used, for example, for make-up or for shaving, the focal length of the Fresnel lens being appropriately chosen in each case to give rise to a magnified image of suitable size. CLAIMS
1. A magnifying mirror comprising in combination a flat mirror, and extending over its reflecting area, a Fresnel lens.
2. A mirror according to claim 1 wherein the Fresnel lens is of such focal length as to make tie combination suitable for use as a shaving or makeup mirror.
3. A mirror according to claim 1 or claim 2 wherein the Fresnel lens is applied to that side of the mirror which has the reflecting surface.
4. A mirror according to claim 3 wherein the grooved surface which constitutes the Fresnel lens is spaced away from the adjacent surface of the mirror.
5. A mirror according to any one of the preceding claims wherein the reflecting surface is used as a normal fleat mirror on the side opposite that to which th Fresnel lens is applied.
6. A mirror according to any one of the preceding claims wherein the components are sealed together by a surrounding band of metal or plastics, or by welding.
GB7905670A 1979-02-17 1979-02-17 Magnifying mirror comprising Fresnel lens Withdrawn GB2042204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7905670A GB2042204A (en) 1979-02-17 1979-02-17 Magnifying mirror comprising Fresnel lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7905670A GB2042204A (en) 1979-02-17 1979-02-17 Magnifying mirror comprising Fresnel lens

Publications (1)

Publication Number Publication Date
GB2042204A true GB2042204A (en) 1980-09-17

Family

ID=10503263

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7905670A Withdrawn GB2042204A (en) 1979-02-17 1979-02-17 Magnifying mirror comprising Fresnel lens

Country Status (1)

Country Link
GB (1) GB2042204A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132375A (en) * 1982-12-17 1984-07-04 Christian James Blom Segmented mirror
US4493535A (en) * 1980-09-12 1985-01-15 Andre Champeau Hybrid transmissive focalizing optical system
US5074646A (en) * 1989-04-28 1991-12-24 At&T Bell Laboratories Planar reflective optical devices
US6592077B2 (en) * 2000-09-19 2003-07-15 Airbus Deutschland Gmbh Windows with a lens for an aircraft door

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493535A (en) * 1980-09-12 1985-01-15 Andre Champeau Hybrid transmissive focalizing optical system
GB2132375A (en) * 1982-12-17 1984-07-04 Christian James Blom Segmented mirror
US5074646A (en) * 1989-04-28 1991-12-24 At&T Bell Laboratories Planar reflective optical devices
US6592077B2 (en) * 2000-09-19 2003-07-15 Airbus Deutschland Gmbh Windows with a lens for an aircraft door

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)