GB1584782A - Electric lamps - Google Patents
Electric lamps Download PDFInfo
- Publication number
- GB1584782A GB1584782A GB6819/77A GB681977A GB1584782A GB 1584782 A GB1584782 A GB 1584782A GB 6819/77 A GB6819/77 A GB 6819/77A GB 681977 A GB681977 A GB 681977A GB 1584782 A GB1584782 A GB 1584782A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- lens part
- parts
- moulded
- plastics material
- 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
Links
- 239000000463 material Substances 0.000 claims description 54
- 239000002131 composite material Substances 0.000 claims description 35
- 239000004033 plastic Substances 0.000 claims description 32
- 229920003023 plastic Polymers 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005755 formation reaction Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003086 colorant Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 235000021028 berry Nutrition 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00605—Production of reflex reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/50—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
- F21S43/51—Attachment thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
Description
(54) IMPROVEMENTS IN OR RELATING TO ELECTRIC LAMPS
(71) We: BRITAX VEGA LIMITED, formerly known as VEGA AUTO PRODUCTS
LIMITED, a British Company of Berry Hill
Industrial Estate, Kidderminster Road,
I)roitwich, Worcestershire, do hereby declare the invention, for which we pray that a Patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to electric lamps, particularly, though not exclusively, electric lamps for motor vehicles.
It is now common for multiple lamp units to be provided for vehicles in which two or more lamps of a vehicle are assembled together. For example, for the front of a vehicle side and turn signal lamps may be included in one unit, and a unit for the rear of a vehicle may contain tail/stop, turn signal, reversing and fog lamps. The lenses for multiple lamp units usually comprise parts of different colours and/or profiles to suit the individual light-emitting requirements of the different lamps contained in the unit. The combining together of the parts into a composite lens structure has presented problems in manufacture, and with some of the methods of manufacture employed hitherto there has been an appreciable. risk of there being defects in the finished lenses which result in undesirable wastage.
The present invention seeks to provide an improved method of manufacturing a composite lens which reduces the risk of there being defects in the finished lens.
The present invention consists in a method of manufacturing a composite lens for an electric lamp, comprising the steps of premoulding to finished form from plastics material a lens part, and, with the premoulded lens part positioned in a mould, completing, or substantially completing, the composite lens by moulding plastics material around the lens part which holds the lens part captive in the completed lens.
For a vehicle lamp it will be usual for two or more lens parts to be premoulded individually for inclusion in the composite lens. The premoulded lens parts may have different profiles from one another and/or be of different colours. As the lens parts are moulded individually, they can be readily produced in the forms and colours required.
The moulded material which holds the premoulded lens part or parts captive may be of a different colour from the lens part or parts and may be transparent or opaque.
It may simply form a frame around the lens part or parts, in which case the material may be of a contrasting colour to the lens part or parts, for example black, to make it a styling feature of the completed lens.
Alternatively the material may be moulded to form a further lens part or parts and/or a reflector. When the composite lens contains two or more lens parts the moulded material may serve to separate the lens parts as may be necessary to comply with regulations.
The plastics material moulded around the lens part or parts may be similar to the material of the lens part or parts, or it may be different. When similar materials are used, or the materials are suitably compatible, as for example in the case of polymethylmethacrylate and acrylonitrile butadiene styrene, the material may fuse to the lens part or parts as it is moulded.
Preferably the or each premoulded lens part has keying formations at its periphery, for example flanges or other projections, or recesses, to which the material which is moulded around the lens part keys mechanically when it is moulded around the part.
The key enhances the retention of the lens part. Furthermore, it can assist in providing a waterproof connection between the lens part and the moulded material.
Preferably the or each lens parts is of generally open box shape comprising a main wall portion formed as the lens proper of the lens part and peripheral wall portions which project from the main wall portion.
That form increases the rigidity of the completed composite lens, and the area of contact between the lens part and the moulded material around it is increased to ensure a sound joint between the lens part and the material. Furthermore the box form allows masks or shields to be readily provided if required to prevent light-bleed between the lamps of a multiple lamp unit in which the composite lamp is incorporated in use.
The mould in which the or each premoulded lens part is positioned for the application of the plastics material may be in a conventional moulding machine. Use of a complex multi-barrel machine such as employed in some of the known methods of manufacturing composite lenses is unnecessary. The or each lens part may be formed with a platform portion which is arranged to be engaged by a punch or other suitable locating means of the mould which locates and supports the lens part in the mould and prevents the plastics material from reaching areas of the lens part where it is not required, as it is moulded around the lens part. In the preferred box form of the lens part or parts the platform portion is conveniently formed as a step within the box shape of the lens part in the angle between the main wall and peripheral wall portions of the lens part. The provision of the platform portion and its engagement by the locating means avoids the bedding out and very acurate fit in the mould required in the known skin-moulding method in which moulded lens parts are subsequently covered entirely by a further layer, or skin, of plastics material. The locating means affords support for the lens part during the moulding and minimises the risk of cracking of the lens part, which is commonly associated with the skin-moulding method.
It is possible to obtain a secure connection between the lens part or parts and the plastics material moulded around the part or parts more readily by the method according to the present invention than it is to retain the further layer or skin to lens parts by the skin-moulding method. It will be appreciated also that a composite lens of thinner section can be produced by the present method than by the skin-moulding method.
The composite lens may be formed with screw holes for fixing it to the body of a multiple lamp unit. Some at least of the holes may be defined in the plastics material as it is moulded around the lens part or parts. Alternatively, if the body is a plastics moulding and the plastics materials of the body and composite lens are suitable for the purpose, the lens may be welded to the body.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:
Figure I is a front view of a composite lens for a motor vehicle lamp unit manufactured by the method according to the present invention,
Figure 2 is a front view of a lens part which is incorporated in the composite lens,
Figure 3 is a section on line 3-3 of
Figure 2,
Figure 4 is a front view of another lens part which is incorporated in the composite lens.
Figure 5 is a section on line 5-5 of
Figure 4,
Figure 6 is a fragmentary diagrammatic section through a mould for use in the manufacture of the composite lens, and
Figure 7 is a section on line 7-7 of
Figure 1.
In this embodiment of the invention the method is applied to the manufacture of a composite lens for a multiple lamp unit for the rear of a motor vehicle. The unit contains stop/tail, turn signal, reversing and fog lamps.
As a first step in the method, a turn signal lens part 1, as shown in Figures 2 and 3, and a reversing lamp lens part 2, Figures 4 and 5, are moulded individually to the desired finished form respectively in an amber coloured plastics material and a colourless clear plastics material. The plastics material is preferably polymethylmethacrylate. Both lens parts are of a generally rectangular, open box shape each comprising a front, or main wall 3 which is formed as the lens proper of the lens part and peripheral side walls 4 projecting rearwards from the front wall. Each lens part also has a platform portion 5 formed by a rectangular section step in the moulding extending continuously around the inside of the box shape in the angles between the front and side walls. Plain holes 6 are defined in the front wall 3 of the turn signal lens part 1. Each lens part has integral lateral flanges 7 projecting outwards from the side walls 4 and set back from the front surface of the part.
The two lens parts are assembled in spaced positions in a mould 8, as shown in Figure 6. Punches 9 in the mould engage with the platform portions 5 of the lens parts to locate and support the lens parts in the mould.
In the mould a red coloured plastics material, again preferably polymethylmethacrylate, is moulded around the lens parts to complete the composite lens. The moulded plastics material is indicated by reference 10 in Figures 1 and 7. The punches 9 prevent the material 10 from reaching surfaces of the lens parts inside the box shape of the lens parts. The material is moulded to form portions 11, 12 of the composite lens which cover the stop/tail and fog lamps respectively, and also a continuous rearward flange 13 extending around the periphery of the lens. The material 10 holds the lens parts captive, and the lateral flanges 7 key the lens parts mechanically to the material.
A continuous sealing flange 14 is also formed in the moulded material 10. This sealing flange 14 is spaced inwards from the rearward flange 13 so that a channel 15 is defined between the two flanges. Plain holes
16 are defined in the material 10 as well as it is moulded.
The completed composite lens has a continuous front surface 17 which, as can be appreciated from Figure 7, is free of recesses in which dirt could collect and reduce the efficiency of the lens. Furthermore the lens has a minimum of salient edges.
The composite lens is fixed to a body of the multiple lamp unit by means of screws which are inserted in the holes 6 of the turn
signal lens part 2 and the holes 16 of the material 10, and are screwed into threaded holes or sockets in the body. The rear edges of the side walls 4 of the lens parts and the rear edge of the sealing flange 14 abut against flat surfaces of the body so that the lens is well supported by the body. The sealing flange 14 and the channel 15 assist in providing a water tight joint between the composite lens and body. A sealing ring may additionally be fitted in the channel.
WHAT WE CLAIM IS:
1. A method of manufacturing a composite lens for an electric lamp, comprising the steps of premoulding to finished form from plastics material a lens part, and, with the premoulded lens part positioned in a mould, completing, or substantially completing, the composite lens by moulding plastics material around the lens part which holds the lens part captive in the completed lens.
2. A method according to Claim 1 in which two or more individual lens parts are pre-moulded, assembled in the mould and then have the plastics material moulded around them in the mould.
3. A method according to Claim 1 or
Claim 2 in which the plastics material moulded around the lens part or parts is moulded to form a further lens part or parts.
4. A method according to any preceding claim in which the plastics material moulded around the lens part or parts is moulded to form a reflector.
5. A method according to any preceding claim in which the plastics material moulded around the lens part or parts is similar to the plastics material of the lens part or parts.
6. A method according to any preceding claim in which the or each premoulded lens part has keying formations at its periphery to which the plastics material keys mechanically when it is moulded around the lens part.
7. A method according to any preceding claim in which the or each premoulded lens part is of a generally open box shape comprising a main wall portion formed as the lens proper of the lens part and peripheral wall portions which project from the main wall portion.
8. A method according to any preceding claim in which the or each premoulded lens part has a raised platform portion, and the mould in which the lens part or parts are positioned has locating means which engage with the platform portion of the or each lens part to locate and support the lens part in the mould and prevent the plastics material from reaching areas of the
lens part where it is not required as it is moulded around the lens part.
9. A method according to Claim 7 as dependent from Claim 6 in which the platfrom portion of the or each lens part is formed as a step within the box shape of the lens part in the angle between the main wall and peripheral wall portions.
10. A method of manufacturing a composite lens for an electric lamp substantially as described herein with reference to and as illustrated by the accompanying drawings.
11. A composite lens for an electric lamp manufactured by the method claimed in any preceding claim.
12. An electric lamp including a composite lens as claimed in Claim 11.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (12)
- **WARNING** start of CLMS field may overlap end of DESC **.A continuous sealing flange 14 is also formed in the moulded material 10. This sealing flange 14 is spaced inwards from the rearward flange 13 so that a channel 15 is defined between the two flanges. Plain holes16 are defined in the material 10 as well as it is moulded.The completed composite lens has a continuous front surface 17 which, as can be appreciated from Figure 7, is free of recesses in which dirt could collect and reduce the efficiency of the lens. Furthermore the lens has a minimum of salient edges.The composite lens is fixed to a body of the multiple lamp unit by means of screws which are inserted in the holes 6 of the turn signal lens part 2 and the holes 16 of the material 10, and are screwed into threaded holes or sockets in the body. The rear edges of the side walls 4 of the lens parts and the rear edge of the sealing flange 14 abut against flat surfaces of the body so that the lens is well supported by the body. The sealing flange 14 and the channel 15 assist in providing a water tight joint between the composite lens and body. A sealing ring may additionally be fitted in the channel.WHAT WE CLAIM IS: 1. A method of manufacturing a composite lens for an electric lamp, comprising the steps of premoulding to finished form from plastics material a lens part, and, with the premoulded lens part positioned in a mould, completing, or substantially completing, the composite lens by moulding plastics material around the lens part which holds the lens part captive in the completed lens.
- 2. A method according to Claim 1 in which two or more individual lens parts are pre-moulded, assembled in the mould and then have the plastics material moulded around them in the mould.
- 3. A method according to Claim 1 or Claim 2 in which the plastics material moulded around the lens part or parts is moulded to form a further lens part or parts.
- 4. A method according to any preceding claim in which the plastics material moulded around the lens part or parts is moulded to form a reflector.
- 5. A method according to any preceding claim in which the plastics material moulded around the lens part or parts is similar to the plastics material of the lens part or parts.
- 6. A method according to any preceding claim in which the or each premoulded lens part has keying formations at its periphery to which the plastics material keys mechanically when it is moulded around the lens part.
- 7. A method according to any preceding claim in which the or each premoulded lens part is of a generally open box shape comprising a main wall portion formed as the lens proper of the lens part and peripheral wall portions which project from the main wall portion.
- 8. A method according to any preceding claim in which the or each premoulded lens part has a raised platform portion, and the mould in which the lens part or parts are positioned has locating means which engage with the platform portion of the or each lens part to locate and support the lens part in the mould and prevent the plastics material from reaching areas of the lens part where it is not required as it is moulded around the lens part.
- 9. A method according to Claim 7 as dependent from Claim 6 in which the platfrom portion of the or each lens part is formed as a step within the box shape of the lens part in the angle between the main wall and peripheral wall portions.
- 10. A method of manufacturing a composite lens for an electric lamp substantially as described herein with reference to and as illustrated by the accompanying drawings.
- 11. A composite lens for an electric lamp manufactured by the method claimed in any preceding claim.
- 12. An electric lamp including a composite lens as claimed in Claim 11.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6819/77A GB1584782A (en) | 1977-02-18 | 1977-02-18 | Electric lamps |
| DE2806869A DE2806869C2 (en) | 1977-02-18 | 1978-02-17 | Method of making a compound lens for an electric lamp |
| FR7804595A FR2380864A1 (en) | 1977-02-18 | 1978-02-17 | PROCESS FOR MAKING A COMPOSITE DIFFUSER GLASS FOR AN ELECTRIC LAMP SUCH AS A MOTOR VEHICLE LIGHT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6819/77A GB1584782A (en) | 1977-02-18 | 1977-02-18 | Electric lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1584782A true GB1584782A (en) | 1981-02-18 |
Family
ID=9821346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6819/77A Expired GB1584782A (en) | 1977-02-18 | 1977-02-18 | Electric lamps |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2806869C2 (en) |
| FR (1) | FR2380864A1 (en) |
| GB (1) | GB1584782A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1600275A1 (en) * | 2004-05-29 | 2005-11-30 | DaimlerChrysler AG | Vehicle lamp |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2466327A1 (en) * | 1979-09-27 | 1981-04-10 | Saint Marcel Mfg | PROCESS FOR MANUFACTURING INDUSTRIAL PARTS OF SYNTHETIC MATERIAL COMPRISING A RIGID PART SURMOUNTED OF A FLEXIBLE PART, AND AN INDUSTRIAL PART OBTAINED BY THIS PROCESS |
| FR2523897A1 (en) * | 1982-03-23 | 1983-09-30 | Frankani Sa | METHOD FOR MANUFACTURING A TRICOLOR TRANSPARENT OF AUTOMOTIVE SIGNALING FIRE |
| FR2579129B1 (en) * | 1985-03-22 | 1987-08-28 | Cartier Ind | SLIDING INJECTION MOLD FOR THE PRODUCTION OF COMPOSITE PARTS |
| FR2584338B1 (en) * | 1985-07-02 | 1987-10-16 | Axo Equip Automobile | METHOD FOR MANUFACTURING OPTICAL BLOCKS AND OPTICAL BLOCKS OBTAINED, ACCORDING TO SAID METHOD |
| US4650623A (en) * | 1985-12-31 | 1987-03-17 | Lci Industries, Inc. | Method of making patterned flexible sheet-like articles |
| FR2716708B1 (en) * | 1994-02-28 | 1996-05-10 | Valeo Vision | Glass for vehicle lighting or signaling device and device thus equipped. |
| FR2716709B1 (en) * | 1994-02-28 | 1996-05-10 | Valeo Vision | Glass for vehicle lighting or signaling device and device thus equipped. |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2024082A1 (en) * | 1970-05-16 | 1971-12-02 | Swf | Cover glass for motor vehicle lights |
| BE795063A (en) * | 1972-02-19 | 1973-05-29 | Rau Swf Autozubehoer | PROCESS FOR THE REALIZATION OF A PART IN SYNTHETIC MATERIAL |
| AU6123873A (en) * | 1972-10-28 | 1975-04-10 | Lucas Electrical Co Ltd | Lamp lenses |
| IT1024581B (en) * | 1974-10-15 | 1978-07-20 | Altissimo Aimone S P A | PROCEDURE FOR INJECTION MOLDING OF PLASTIC MATERIAL OBJECTS CONSISTING OF THREE PORTIONS OF DIFFERENT COUORS AND EQUIPMENT FOR IMPLEMENTING THE PROCEDURE |
| FR2301357A1 (en) * | 1975-02-24 | 1976-09-17 | Frankani Sa | Composite coloured plastic components - obtd. by injection moulding - bonding rigid plastic layer to prefabricated parts of flexible plastic material |
-
1977
- 1977-02-18 GB GB6819/77A patent/GB1584782A/en not_active Expired
-
1978
- 1978-02-17 FR FR7804595A patent/FR2380864A1/en active Granted
- 1978-02-17 DE DE2806869A patent/DE2806869C2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1600275A1 (en) * | 2004-05-29 | 2005-11-30 | DaimlerChrysler AG | Vehicle lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2806869A1 (en) | 1978-08-31 |
| FR2380864A1 (en) | 1978-09-15 |
| FR2380864B1 (en) | 1983-09-09 |
| DE2806869C2 (en) | 1984-10-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |