FR2682196A1 - APPARATUS FOR APPLYING LIGHT FROM A SOURCE TO AN OBJECT. - Google Patents

Abstract

An apparatus for applying light from a light source to an object to be irradiated. It relates to an apparatus which comprises a member (31) for reflecting the light rays emitted by the source and which are in a first predetermined range of wavelengths, and at least one member (35) for removing heat. for absorbing light rays which are in a second predetermined range of wavelengths, placed in the path of the light emitted by the light source, the heat removing member having a transparent part. Application to the manufacture of spectacle lenses.

Description

The invention relates to apparatus for applying light, and more

  precisely, it concerns a device

  application of light that can be used for

  application of ultraviolet rays for bonding objects using an adhesive that cures under the action of ultraviolet rays. Recently, glasses with a gradually varying focal length have been used as spectacle lenses.

  is formed by gluing a glass before giving a progress

  This adhesive is very much used for this bonding, an adhesive polymerizing under the action of ultraviolet rays In known manner, this adhesive is polymerized when it is illuminated by rays. As a result, one should use a

ultraviolet rays.

  In general, the ultraviolet ray application apparatus comprises a mercury vapor lamp as a light source. In such an apparatus, the ultraviolet rays are obtained from the light source by use of a mirror or a filter. with cold light that transmits only ultraviolet rays, and ultraviolet rays are applied to the glasses to be glued As the mercury vapor lamp is a discharge tube, the temperature of the wall of the tube amounts to a value of 700 to 800 OC so that a large amount of infrared radiation is emitted from the wall of the tube As

  almost all infrared rays are infra-red rays

  red, the suppression of the infrared rays by a cold light filter is not effective Thus, the infrared rays emitted by the wall of the tube which constitutes a source of heat are applied to the glasses with the ultraviolet rays In the case where the filter in cold light is not cooled in particular, the temperature of the surface is increased to a value of 150 to 200 OC, and infrared rays are emitted as a secondary heat source As a result, the glasses to stick are deformed under the action of heat and cause a

  cracking of various coatings carried by the glasses and deterioration of the ultraviolet curing adhesive so that the glasses can not be sufficiently adhered by the adhesive.

  It is an object of the invention to provide a light application apparatus which has excellent heat-removal characteristics and excellent heat-absorbing characteristics, and it also relates to such a light-emitting apparatus. light application which has a small footprint and low cost and yet has an excellent light utilization efficiency in a predetermined range of wavelengths, that of ultraviolet radiation in the case of a device

  application of ultraviolet rays.

  An apparatus for applying light from a light source to an object to be irradiated, wherein a cold light filter is for emitting light rays emitted from a light source and which are in a first predetermined range wavelength, and a heat removal member for removing heat from the cold light filter, the heat removal member being placed between the cold light filter and the object and having a party

transparent.

  In the light application apparatus, even if the cold light filter has a high temperature due to the absorption of the infrared rays emitted by the mercury vapor lamp and emits the infrared rays under

  form of a secondary source of heat, the organ of elimination

  The nation of heat absorbs the infrared rays and the object hardly warms up. In addition, cooling air circulates through an air introduction hole or orifice and cools the heat removal member or the mirror. cold light or the cold light filter, so that the infrared rays from these organs are

reduced quantity.

  When using a shutter, when the

  light should not be applied to the object, in the

  In this case, the object is protected against an increase in temperature by closing the shutter placed in the light path of the light application apparatus in which the mercury vapor lamp continues to operate. In such a light application apparatus, the heat removal member provides heat absorption and, in addition, a reflective surface of a light shield, having a number of grooves in V, reapplies the ultraviolet rays to the glasses made of plastic material As a result, the adhesive can undergo a more polymerization

thrust.

  In another aspect, the invention relates to a liquid cooling assembly having a transparent liquid disposed in a formed internal space.

  between two transparent parts. In this way, the

  The light-applying fluid which provides cooling by a liquid has excellent heat-absorbing properties.

  Other features and advantages of the invention

  will be better understood by reading the description

  which will follow examples of embodiment, with reference to the accompanying drawings in which: Figure 1 is a section through a vertical plane of a spectacle lens gluing machine, in a first embodiment of the apparatus of ultraviolet light application according to the invention; Figure 2 is a side elevational view with broken parts of an air exhaust duct of a spectacle lens gluing machine shown in Figure 1; Fig. 3 is a view showing the action of a planar shutter shown in Fig. 1; Fig. 4 is a bottom view showing grooves of a heat removal body shown in Fig. 1; Fig. 5 is a vertical sectional view of a spectacle lens gluing machine having an ultraviolet light application apparatus according to a second embodiment of the invention; Figure 6 is a vertical sectional view of a spectacle lens gluing machine having a light ray application apparatus according to a third embodiment of the invention; Fig. 7 is an elevational view with torn parts showing the structure of a liquid-cooled assembly of Figs. 5 and 6; and

  FIG. 8 is a perspective view of the arrangement

  general assembly of the glasses lens gluing machine. The invention is described with reference to embodiments shown in the accompanying drawings. FIG. 8 is a perspective view of the exterior of a spectacle lens gluing machine comprising a light application apparatus according to the invention. invention A set 2

  air filter is permanently mounted on the upper surface

  The air purified by the assembly is transmitted to the lower part of the machine The frame 1 comprises, at its upper part, a fluorescent lamp 3 of a type emitting little ultraviolet rays, a blackboard 4 allowing the detection of dust or the like on the glasses, and a pneumatic broom 10 for removing dust or the like from the glasses The frame 1 comprises a work table 11 placed in its middle part and on which are placed a glass press 8 , a syringe assembly 9, a control device 7 and an apparatus for applying ultraviolet rays 5 (or application of

  light) A glass mounting plate 6 is movable.

  The machine operates as follows.

  First, among the plastic glasses that must be glued, the front lens FL (see Figure 1) is placed on the plate 6 and the syringe assembly 9 is operated so that the necessary amount of an adhesive S which According to the invention, the rear glass BL (see FIG. 1) is placed on the front glass FL, and the first is pushed against the second glass. using the press 8 so that the adhesive S is evenly distributed between the glasses FL and BL The plate 6 carrying the temporarily glued glasses is moved to the ultraviolet ray application apparatus 5 in which the rays

  ultraviolet rays are applied to glasses.

  FIGS. 1 to 4 show a first embodiment of an apparatus for applying ultraviolet rays according to the invention. An upper plate 13 having a light transmission aperture 12 is permanently mounted on the table 11 so that it located at this table 11 and covers the opening 11a of the table 11 A support frame 14 of a lamp housing is permanently mounted to the underside of the table A lamp housing 5 is supported in the frame 14 of

  way that a cooling air circulation passage

  The casing 15 is secured to the support frame 14 by small elastic pieces 17 acting as spacers, and a space (or passage 16 of cooling air) is formed.

  between the lamp housing 15 and the support frame 14.

  The lamp housing 15, which is in the form of a housing, has a hole 18 for introducing air at one end and a tube 19 for exhausting air at the other end. The tube 19 joins the outside the frame 14 supporting the lamp housing by an opening formed therein The space between the tube 19 and the opening 20 is sealingly closed by an annular seal 21 An axial fan 22 is placed Permanently outside the air introduction hole 22 The axial fan 22 ensures the introduction of cooling air into the lamp housing 15 and its evacuation through the tube 19. an air introduction hole 24 placed below the tube 19 This introduction hole 24 has a filter 25 for purifying the introduced air. A bar-shaped mercury vapor lamp 30 and a cold-light mirror 31 in the form of a paraboloidal cylinder are placed in the lamp housing 15. This mirror 31 is permanently mounted on the housing 15 via plates 32 of mirror support to

cold light.

  The top wall of the housing 15 has an opening 34 aligned with the mercury vapor lamp 30 and the mirror 31. A cold light filter 35 is secured in the opening 34 by a retaining plate 36. The mirror 31 reflects the ultraviolet rays contained therein. in the light of the mercury vapor lamp and transmits the infrared rays, while the cold light filter 35 transmits the ultraviolet rays and absorbs or reflects the rays.

infrared.

  A rotating electromagnet 38 is permanently mounted to the upper surface of a side portion of the lamp housing by a mounting seat 37. A planar shutter 40 is

  mounted on the rotation shaft 39 of the electromagnet 38.

  When the shaft 39 rotates, the shutter 40 moves between a closed position (indicated in broken lines)

  above the filter 35 and an open position (indi-

  solid line) in which the filter 35 is disengaged.

  The surface of the plane shutter which is in front of the filter 35 is a reflective surface having a coefficient

high reflection.

  A heat removal body 46 is mounted to

  remains on top plate 13 attached to the upper face

  11 of the table 11 so that it is above the light-transmitting aperture 12 A heat-removal member 48 formed of a transparent glass of transparent plastic material is mounted in the elimination body 46 of heat, the two surfaces of the member 48 being coated with a film 65 preventing the reflection of ultraviolet rays The body 46 has a step 47 (or a cavity) at its upper face, used for the adjustment of the plate 46 of The body 46 has grooves 58 at its bottom face, acting as heat radiating fins. As best shown in FIG. 4, an opening 54 is formed at a lateral end of the body 46, and a resin filter 55 is mounted in the opening 54 so that it removes the dust from the air Thus, the grooves evacuate heat in the air

introduced by the opening 54.

  A cover 61 for protection against light is placed on the upper plate 13 which is open and closed by rotation about the axis 60 When the cover 61

  is open, the base 6 can be placed in the step 57.

  On the other hand, when the lid is closed, it covers the upper face of the member 48 and prevents the passage of the

ultraviolet rays.

  The apparatus having this construction operates in the following manner. The mercury vapor lamp 30 remains

  switched on so that the amount of light stabilizes.

  When ultraviolet rays are to be applied to the front glass FL and the rear glass BL placed on the plate 6, the shutter 40 is open, and if not,

it is closed.

  When the mercury vapor lamp remains in operation, the wall of its tube has a rising temperature. In this state, the cold-light mirror 31 in the form of a paraboloidal cylinder reflects the ultraviolet rays of the light of the lamp. 30, but transmits

  At the same time, the reflection filter

  These two elements, the mirror 31 and the cold-light filter 35, both absorb the far-infrared rays, especially among the infrared rays, and give off heat, and they therefore constitute the ultraviolet rays. secondary sources of heat When the planar shutter remains closed, the ultraviolet rays and the infrared rays of the secondary heat source of the filter 35 do not reach the member 48 and are reflected by the shutter In these conditions, the fan 22 is a flow of air that flows along the mercury vapor lamp 30 and the cold-light mirror 31 to the air discharge tube 19. At the same time, a stream of air is formed. in the cooling air circulation passage 16 between the housing 15 and the upper plate 13 and flows into the hole 24 or the opening 54 Thus, the aforementioned heat sources are cooled

  by the two drafts, inside and out

with a high return.

  On the other hand, when the shutter 40 is closed, the cover 61 is open and the plate 6 is placed in the step 57 of the heat elimination body 46. As previously described, the front lens FL and the rear lens BL, between which is placed the adhesive S, were placed on the plate 6 When the plate 6 was positioned

  this way, the lid 61 is closed, and the electro-

  rotary magnet 38 is controlled so that it opens the shutter

  As a result, among the light that reaches the filter 35 directly from the lamp 30, the infrared rays are absorbed or reflected by the filter as the ultraviolet rays pass through and reach

  the heat removal member 48.

  As previously described, a beam of parallel rays is applied to the front and rear lenses BL

  so that the light from the lamp 30 is reflected

  in the mirror 31 In this parallel ray beam

  However, the ultraviolet rays can be uniformly applied to the front glass FL and the rear glass BL so that the ultraviolet-curing adhesive can cure evenly between the two glasses. FIG. 5 represents a second embodiment of apparatus according to the invention. This second embodiment differs from the first embodiment in that an ultraviolet-ray application apparatus 5A comprises a cold-light mirror 31A in the form of a a cylinder of elliptical section in place of the cold-light mirror 31 in the form of a paraboloidal cylinder of the first embodiment, and by a liquid-cooling assembly 45. The other elements are similar to those of the first embodiment of the invention.

production.

  The liquid-cooled assembly 45 is formed in the following manner. Curved transparent heat dissipating portions 48 A formed of glass or plastic are attached to the front and rear faces of an overall body 46A This internal space 47 is filled with pure water 49. Accordingly, the assembly 45 which comprises the curved transparent portions 48 A and the pure water 49 plays the role of A concave lens The front focus and the back focus of the liquid cooling assembly coincide with the first focus F 1 and the second focus F 2 of the light mirror

  31A in the form of an elliptical cylinder As a result,

  In this case, the light reflected by the mirror 31A towards the second focus is converted into parallel rays by the assembly 45, parallel to the optical axis. The body 46A of the cooling assembly with a liquid has a plug 50 allowing introduction or disposal of water

pure 49.

  The liquid cooling assembly 45 has

  heat pipes 52 which are placed inside and outside

  inside the inner space 47 fins 53 of radius-

  are mounted so that they are

  the outer end portion of each of the heat pipes 52 An aperture 54 and a filter 55 are disposed

  outside the fins 53 of heat radiation.

  The cooling air is transmitted by the filter 55 and the opening 54 to the radiating fins of heat, then

  it is transmitted by a communication hole 56 and the opening

  12 light transmission of the upper plate

  13 to the support frame 14 of the lamp housing.

  In the second embodiment, the cold-light mirror support plates 32 have apertures 33 which increase the cooling effect of the cold-light mirror 31A, and the center of the mercury vapor lamp 30 is the first focus Fl of the mirror 31A or near Thus, given the nature of the elliptical mirror, the light reflected by the mirror 31 A advances to the second focus F 2 of the optical member 31 In addition, the ultraviolet rays which are reflected by the mirror 31A to the second focus F 2 are transformed into parallel rays so that the liquid cooling assembly 45 has the role of a lens Accordingly, a beam of parallel rays is applied to the glass before FL and the rear glass BL The light coming directly from the lamp 30 is applied by the filter 35 to the assembly

  45 in which it is refracted and is thus

  to the front glass FL and the rear glass BL.

  The light protection cover is

  practically the same as that of the first mode of

  tion, but on its internal surface it bears a reflective surface

  64 having a number of V-grooves 63 whose role is as follows When light is applied

  on the reflecting surface 64, the V grooves reflect the

  In this parallel reflection, the same rays are applied twice to the front glass FL and to the rear glass BL, that is to say that the application of the

  ultraviolet rays is performed with high efficiency.

  On the other hand, the cold light filter 35 absorbs

  The infrared rays and the ultraviolet rays are applied to the liquid cooling assembly 45. The latter set 45 has a high cooling effect because it is filled with the liquid. transparent liquid 49 The pure water 49 is in contact with the heat pipes 52 while the outer end portions of the heat pipes 52 are in contact with the stream of air flowing between the fins 53 of heat radiation. As a result, the cooling of the The liquid cooling assembly is performed in high efficiency, i.e. the heat generated by the filter 35 does not affect the front glass FL and the rear glass BL. This eliminates difficulties such as thermal deformation. glass

  before FL and rear glass BL, the cracking of

  glasses and the deterioration of the adhesive.

  Figure 6 represents a third embodiment of

  This third embodiment differs from the second in that an ultraviolet ray application apparatus 5 B has a paraboloidal cylinder cold light mirror 31 in place of the cold light mirror 31A. with an elliptical cylinder of the second embodiment, and a liquid cooling assembly 45 A, having no lens function, is used instead of the assembly 45. The rest of the elements are similar to those of the second one. Embodiment In a manner known in the art, the vapor lamp 30 of

  mercury is placed in the focus of the parabolic cylindrical mirror

  January 31, so that mirror 31 reflects the light of the lamp 30 parallel to the optical axis Accordingly, the flat members 48 B heat removal are placed on the front and rear faces of the assembly 45 A further ,

  in the third embodiment, the cooling effect

  dissement and reflection of light in the direction

  parallel are realized, ie the cooling

  The 45 A assembly is used and the reflection of the light in the parallel direction is due to the V-grooves 63

  forming the reflecting surface 64 of the cover 61.

  As previously described, in the application apparatus

  According to the invention, the light of the light source is reflected by the cold-light mirror and is applied to the object to be irradiated by passage through the heat-removal member. Accordingly, the heat from the source The light is absorbed by the heat removal member and the object is relatively unaffected by the heat. The light application apparatus is thus suitable for

  the application of ultraviolet rays to plastic lenses which must be adhered by an ultraviolet-curing adhesive. In addition, the cooling air circulating through an introducer hole

  air or an opening cools the removal organ.

  heat or the cold-light mirror or the cold-light filter so that the heat from these

organs is reduced.

  The inner surface of the cover, intended to cover the object to be irradiated, is formed on the reflecting surface with a number of V-grooves which reflect the incident ultraviolet rays in a parallel direction so that the light utilization efficiency is

increased.

  Since the liquid cooling assembly is such that the internal space formed between the transparent parts is filled with a transparent liquid, this

  liquid provides a cooling effect by a liquid.

  Thus, the light application apparatus has excellent

heat absorption.

  As heat pipes are incorporated in the set of

  liquid cooling in such a way that their

  external units are exposed to external air and their

  internal ends are placed in the transparent liquid

  rent, the cooling effect is further increased.

  In the first embodiment, the light-shielding cover may carry, on its inner face, a reflecting surface having a certain number

  V-grooves, although these are not representative of

  In addition, it is not necessary to use pure water in the cooling assembly.

  by a liquid, as long as the liquid is transparent.

  Of course, various modifications may be made by those skilled in the art to the light application apparatus which have just been described as non-limiting examples without departing from the scope of the present invention.

the invention.

Claims (11)

  Apparatus for applying light from a light source (30) to an object to be irradiated, characterized in that it comprises: an optical filtering member (31) for emitting light rays emitted by the source and are in a first predetermined range of wavelengths, and a heat removal device (35) placed between the filter member (31) and the object and for removing heat from the optical filtering. Apparatus according to claim 1, characterized in that it comprises an optical reflecting member for reflecting the light rays of the source which are in a first predetermined range of wavelengths. Apparatus according to claim 1, characterized in that the heat removal device comprises a transparent part.   Apparatus according to claim 1, characterized in that the heat removal device is a   together (45) for cooling with a liquid which   carries two transparent parts forming the two surfaces of the set and a liquid which fills a delimited space by the two transparent parts.   Apparatus according to claim 4, characterized in that the liquid cooling assembly (45) has a concave lens function given by the curved shape   heat removal members (48A).   Apparatus for applying light from a lamp forming a light source (30) to an object to be irradiated, characterized in that it comprises: a member (31) for reflecting the rays   light emitted by the source in at least one predetermined range   terminated wavelength, and a liquid cooling assembly (45) for transmitting light rays reflected from the reflecting member and applying the light rays to the object, the liquid cooling assembly (45) comprising two transparent parts forming surfaces, and a transparent liquid placed in the space delimited by the two transparent parts.   Apparatus according to claim 6, characterized in that the liquid cooling assembly (45) has a concave lens function due to the curved shape of the transparent parts (48 A).   Apparatus according to one of claims 5 and 7,   characterized in that the reflection member (31) comprises a mirror in the form of an elliptical cylinder whose first and second focus coincide with the front foci   and rear of the assembly cooled by a liquid.   9 Apparatus according to claim 6, characterized in that the object to be irradiated is formed of glasses (FL, BL) of plastic material to be glued by an adhesive which polymerizes under the action of ultraviolet rays, and the light rays of the predetermined range of lengths   wave are ultraviolet rays.   Apparatus according to claim 6, characterized   in that it further comprises a cover (61) for protecting   against the light placed on the side of the object opposite to that where the heat removal member is located, and the light-shielding cover (61) carries, on its inner surface, a reflective surface having a certain number of V-grooves (63) to return the rays   incident ultraviolet light that passed through the object almost parallel.   Apparatus according to any one of the claims   4, 6 and 10, wherein the cooling assembly (45)   a liquid has at least one heat pipe (52) whose outer end portions are exposed to external air and whose inner end portions are placed in the liquid that is transparent.   Apparatus according to one of claims 3 and 11,   characterized in that it comprises a light-shielding cover (61) placed on a first side of the object, opposite the one where the heat-removal member is located. Apparatus according to claim 12, characterized in that the light-shielding cover (61) carries, on its inner side, a reflecting surface having a number of V-shaped grooves (63) for reflecting incident ultraviolet rays which crossed the object   in substantially parallel directions.   Apparatus according to claim 13, characterized in that it comprises a shutter (38) intended to prevent   the application of light from the light source to the object.   Apparatus according to claim 14, characterized   in that it further comprises a cooling device   the appliance with a fan (22) forming a cooling air flow.   Apparatus according to claim 15, characterized in that the object to be irradiated is in the form of plastic glasses (FL, BL) intended to be adhered by an ultraviolet-curing adhesive,   and the light rays of the predetermined range of   Wavelengths are ultraviolet rays.