Foldable light generating device

Abstract

The invention provides a light generating device (1000) comprising s1 light sources (100) and a support (200) configured to support the s1 light sources (100), wherein the s1 light sources (100) are configured to generate light source light (101), wherein s1>1 and wherein: (a) the support (200) comprises n1 domains (210), wherein n1>3, wherein the support (200) comprises k1 fold lines (220), wherein k1>2, wherein at least three of the n1 domains (210) are separated by at least two of the k1 fold lines (220); wherein the domains (210) have a first domain side (211) and a second domain side (212); (b) the at least three of the n1 domains (210) and the at least two of the k1 fold lines (220) are configured parallel; and (c) the light generating device (1000) comprises m1 adhesive layers (400), wherein m1>2; and wherein at least two of the m1 adhesive layers (400) are functionally coupled to different domain sides (211,212) of one or more domains (210).

Claims

1. A light generating device comprising s1 light sources and a support configured to support the s1 light sources, wherein the s1 light sources are configured to generate light source light, wherein s11; and wherein: the support comprises n1 domains, wherein n1 is more than three, wherein the support comprises k1 fold lines, wherein the fold lines define the domains, at least three of the n1 domains are separated by at least two of the k1 fold lines; wherein the domains have a first domain sided and a second domain side; the n1 domains and the k1 fold lines are configured parallel to each other; and the light generating device comprises m1 adhesive layers, wherein m12; wherein at least two of the m1 adhesive layers are functionally coupled to different domain sides of one or more domains; wherein a plurality of domains are configured to define a cavity in that at least one domain can be folded atop another domain to form said cavity; and wherein said domains folded atop one another can mutually be fixed by the adhesive layer as provided on one domain side, and the light generating device can be adhered to a further element by the adhesive layer as provided on the other, opposite domain side.

2. The light generating device according to claim 1, wherein the support is flexible.

3. The light generating device according to claim 1, wherein the s1 light sources comprise solid state light sources; wherein the support comprises a PCB or wherein a PCB is functionally coupled to the support, and wherein the s1 light sources are functionally coupled to the PCB.

4. The light generating device according to claim 1, wherein at least one of the n1 domains is transmissive for the light source light.

5. The light generating device according to claim 1, wherein one or more of the s1 light sources are configured at the first domain side of one or more domains, and wherein the one or more first domain sides of the one or more domains are reflective for the light source light.

6. The light generating device according to claim 1, wherein one or more domains have optical properties in relation to the light source light, wherein of these one or more domains one or more of the first domain sides and the second domain sides are provided with a removable layer, wherein the removable layer has optical properties in relation to the light source light different from the one or more domains.

7. The light generating device according claim 6, wherein the optical properties differ in one or more of: transmission percentage, transmission direction, wavelength dependence of the transmission, percentage of specular transmission, percentage of diffuse transmission, reflection percentage, reflection direction, wavelength dependence of the reflection, percentage of specular reflection, and percentage of diffuse reflection.

8. The light generating device according to claim 6, wherein at least three of the n1 domains have individually selected domain widths (W2), and have domain lengths (L2), wherein for each of the at least three of the n1 domains applies that L22*W2, and wherein the s1 light sources are configured in one or more arrays, wherein the arrays are selected from the group of 1D arrays and 2D arrays.

9. The light generating device according to claim 6, wherein the at least three of the n1 domains comprise a first domain, a second domain, and a third domain, wherein the first domain and the third domain are both adjacent to the second domain, wherein one or more of the first domain and the third domain individually have a mutual angle with the second domain, wherein the mutual angles are unequal to 180.

10. The light generating device according to claim 9, wherein one or more of the s1 light sources are supported by the second domain, wherein the first domain and the third domain do not support one or more of the s1 light sources, wherein the first domain and the third domain are reflective or transmissive for the light source light.

11. The light generating device according to claim 9, wherein three or more of the first domain, the second domain, the third domain, and optionally one or more further domains, enclose the one or more of the s1 light sources, and wherein at least one of the first domain, the second domain, the third domain, and the optionally one or more further domains, are transmissive for the light source light.

12. The light generating device according to claim 9, comprising one or more sets of each two or more domains, wherein two adjacent domains have mutual angles selected from the range of 05.

13. The light generating device according to claim 9, wherein at least one fold between adjacent domains is provided with the groove on the first domain side, and at least one further fold is provided with a further groove on the second domain side.

14. The light generating device according to claim 9, comprising at least one domain with one of the m1 adhesive layers functionally coupled to the first domain side and with another one of the m1 adhesive layers functionally coupled to the second domain side.

15. A lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, and an optical wireless communication device, comprising the light generating device according to claim 9.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

(2) FIG. 1 A-D schematically depict embodiments of the light generating device.

(3) FIG. 2 schematically depicts an embodiment of the light generating device configured as a roll.

(4) FIG. 3A-E schematically depict embodiments of the light generating device after folding.

(5) FIG. 4 schematically depicts embodiments of the lighting device. The schematic drawings are not necessarily on scale.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) FIG. 1A schematically depicts a side view of an embodiment of the light generating device 1000. The light generating device 1000 comprises s1 light sources 100, wherein the s1 light sources 100 are configured to generate light source light 101, wherein s11, such as s12. The light generating device 1000 further comprises a support 200 configured to support the s1 light sources 100. The support 200 comprises n1 domains 210, wherein n13. The support 200 further comprises k1 fold lines 220, wherein k12. In particular, at least three of the n1 domains 210 may be separated by at least two of the k1 fold lines 220 (also see FIG. 1B). In the depicted embodiment, the at least three of the n1 domains 210 and the at least two of the k1 fold lines 220 may be configured parallel. Further, the domains 210 may have a first domain side 211 and a second domain side 212, wherein the first domain side 211 and the second domain side 212 define a support thickness H1. The first domain side 211 and the second domain side 212 may further define a domain thickness H2, which may (locally) equal the support thickness H1.

(7) In general, the domain thicknesses H2 of different domains may be (essentially) equal. In particular, the (average) domain thicknesses H2 of different domains may vary by less than 5%. Note, however, that on the domains in different domains and/or at different parts of the domains different layers or items may be available.

(8) In embodiments, the support may comprise part of a (flexible) PCB. In other embodiments, a PCB may be functionally coupled, such as mechanically coupled to the support. The support may be a base foil, such as a PI foil or PET foil on which a PCB or a plurality of PCBs may be provided. Other support materials may be e.g. PET, PMMA, or PC, or optical foils comprising one or more other materials. On such foil, a (flexible) PCB may be laminated. Also more than one PCB may be supported by the foil.

(9) In the depicted embodiment, the light generating device 1000 comprises m1 adhesive layers 400, wherein m12. In embodiments, at least two of the m1 adhesive layers 400 may be functionally coupled to one or more of (i) different domain sides 211,212 of one or more domains 210, and (ii) different domains 210. In the depicted embodiment, the at least two of the m1 adhesive layers 400 are functionally coupled to different domains 210.

(10) In particular, in the depicted embodiment, s1=2, n1=3, k1=2, and m1=2.

(11) In the depicted embodiment, one or more of the s1 light sources 100 may be configured at the first domain side 211 of one or more domains 210 (of the n1 domains 210).

(12) In further embodiments, one or more first domain sides 211 of the one or more domains may be reflective for the light source light 101.

(13) However, in further embodiments, the domains 210, especially the first domain sides 211, may be transmissive for the light source light 101, but a removable (adhesive) layer 240 may be arranged on one or more first domain sides 211 of the n1 domains 210, wherein the removable (adhesive) layer 240 is reflective for the light source light 101. Thereby, the optical properties of the light generating device 1000 can be easily tuned by (partially) removing the adhesive layer 240.

(14) The adhesive layer 240 may further provide other optical properties, i.e., the removable (adhesive) layer 240 may have optical properties in relation to the light source light 101 that differ from the optical properties of the domains 210, especially of the first domain sides 211, in relation to the light source light 101. In particular, in embodiments, one or more of the s1 light sources 100 may be configured at the first domain side 211 of one or more domains 210 (of the n1 domains 210), wherein the one or more first domain sides 211 of the one or more domains have optical properties in relation to the light source light 101, wherein one or more of these one or more first domain sides 211 are provided with a removable (adhesive) layer 240, and wherein the removable (adhesive) layer 240 has optical properties in relation to the light source light 101 different from the one or more of these one or more first domain sides 211 (of the one or more domains 210).

(15) In further embodiments, the optical properties of the removable (adhesive) layer 240 and the one or more domains 210 of the n1 domains 210, especially the first domain sides 211 of the one or more domains 210, may differ in one or more of transmission percentage, transmission direction, wavelength dependence of the transmission, reflection percentage, reflection direction, wavelength dependence of the reflection, and especially percentage of specular reflection and/or percentage of diffuse reflection.

(16) In the depicted embodiment, the fold lines 220 comprise a groove, especially wherein the groove is configured to facilitate folding. In particular, the groove has a V-shape. In embodiments, the groove may have a groove depth d1, especially wherein 0.1*H1d10.9*H1.

(17) FIG. 1B schematically depicts a top view of the embodiment of FIG. 1A. In particular, in the depicted embodiment, the n1 domains 210 have an axis of elongation along the support length L1, i.e., the domain length L2 may be larger than the domain width L2, especially wherein L22*W2, such as 3*W2, especially 5*W2. Further, in the depicted embodiment, the domain length L2 may be equal to the support length L1, i.e., in the depicted embodiment all fold lines 220 are arranged parallel to the support length L1.

(18) In the depicted embodiment, the domains 210 have a rectangular shape, wherein the domain length L2 and the domain width W2 are parallel to the support length L1 and the support width W2 respectively. Hence, the domain length L2 of the at least three of the n1 domains 210 and the at least two of the k1 fold lines 220 is configured parallel. In particular, the axis of elongation of the domains 210 is configured parallel to the k1 fold lines 220.

(19) In particular, in the depicted embodiment, at least three of the n1 domains 210 have individually selected domain widths W2, and have domain lengths L2, wherein for each of the at least three of the n1 domains 210 applies that L22*W2.

(20) FIG. 1B further schematically depicts that the s1 light sources are arranged on a second domain 2120, which is configured between a first domain 2110 and a third domain 2130, according to a regular pattern. In particular, the s1 light sources 100 are configured in one or more arrays 1100, wherein the arrays 1100 are selected from the group of 1D arrays and 2D arrays. Specifically, in the depicted embodiment, the s1 light sources 100 are arranged in a 2D array with two rows (along the support width W1) and a constant distance between the light sources 100 along the support length L1.

(21) Reference 1050 indicates a PCB. Here, the PCB includes two rows of light sources 100. The PCB may at least partly be comprised by the middle domain 210 or may be configured on the middle domain 210. For instance, a PCB may be generated on a support (foil), which support (foil) may be much larger than necessary for the PCB, and which support (foil) can be used as support in the present invention.

(22) In particular, the light generating device 1000 may have repeating length sections along the support length L1, i.e., the light generating device 1000 may consist of a plurality of (essentially) identical repeating length sections arranged along the support length L1. This may be particularly convenient when the light generating device 1000 is arranged on a roll 1005, as it facilitates predictably cutting off light generating devices 1000 from the roll, especially cutting off identical light generating devices 1000 from the roll 1005. FIG. 1C schematically depicts an embodiment of the light generating device 1000 after folding along the fold lines 220. In particular, in the depicted embodiment, the at least three of the n1 domains 210 comprise a first domain 2110, a second domain 2120, and a third domain 2130, wherein the first domain 2110 and the third domain 2130 are both adjacent to the second domain 2120, and wherein the first domain 2110 and the third domain 2130 each individually have a mutual angle with the second domain 2120, wherein the mutual angles are unequal to 180, especially 180. In particular, in the depicted embodiment, the mutual angles , .sub.1 between the second domain 2120 and either of the first domain 2110 and the third domain 2130 may be about 100. In further embodiments, the mutual angles between the second domain 2120 and the first domain 2110 and between the second domain 2120 and the third domain 2130 may also differ.

(23) In the depicted embodiment, each of the first domain 2110 and the third domain 2130 also have a mutual angle with (respective) further domains, wherein the mutual angles are unequal to 180, especially <180. In particular, for both the first domain 2110 and the third domain 2130 the mutual angle , .sub.2 with the further domain may be 5. Hence, in embodiments, the light generating device 100 may comprise one or more sets 2200 of each two or more domains 210, wherein two adjacent domains 210 have mutual angles selected from the range of 05.

(24) The s1 light sources 100 may be selectively arranged on one or more of the domains 210, particularly in consideration of any planned folds along the fold lines 220. Hence, in the embodiments depicted in FIG. 1A-C, the one or more of the s1 light sources 100 are supported by the second domain 2120, wherein the first domain 2110 and the third domain 2130 do not support one or more of the s1 light sources 100, i.e., all s1 light sources are arranged on the second domain 2120, wherein the first domain 2110 and the third domain 2130 are devoid of s1 light sources.

(25) In further embodiments, the first domain 2110, the second domain 2120 and the third domain 2130 may be reflective or transmissive for the light source light 101. In particular, the first domain 2110 and the third domain 2130 may be reflective or transmissive for the light source light 101.

(26) FIG. 1D schematically depict two embodiments, one in cross-sectional view, indicated with embodiment I and one in cross-sectional view, indicated with embodiment II. Both embodiments shows some optional features. Examples of fold lines 220 as indentation or as perforation, are shown in embodiments I and II, respectively. In embodiment I, an adhesive layer 400 is shown at the first side 211 and an adhesive layer 400 is shown at the second side 212. In embodiment II, two adhesive layers 400 or two parts of an adhesive layer 400 are schematically depicted. Note that in embodiment II the PCB 1050 has a smaller width than the respective domain 210.

(27) FIG. 2 schematically depicts an embodiment of the light generating device 1000 wherein a single domain 210 and/or a plurality of serially arranged domains 210 are configured rolled up thereby providing a roll 1005. Hence, in embodiments, the support 200 may be bendable, especially flexible.

(28) In particular, the light generating device 1000 may be configured as a roll 1005. Thereby, the light generating device 1000 may be compactly stored and easily transported, and parts of desired lengths can be easily cut off from the roll 1005 in order to install the light generating device 1000 at a desired location.

(29) It will be clear to the person skilled in the art, that the nature of the repeating structure of the light generating device 1000 on the roll implies that a part can be cut off from the roll to yield two light generating devices 1000 according to the invention.

(30) FIG. 3A-C schematically depict unfolded light generating devices 1000 as well as folded light generating devices 1000, they may be folded into. FIG. 3D schematically depicts further folded light generating devices 1000 arranged on a ceiling 10 or a wall 20.

(31) FIG. 3A specifically depicts a light generating device 1000 with two adhesive layers 400 arranged on opposite domain sides 211 of a single domain 210, i.e., the light generating device 1000 comprises a domain 210 with a first domain side 211 and a second domain side 212, wherein the first domain side 211 and the second domain side define a domain thickness H2, and wherein two adhesive layers are arranged on the first domain side and the second domain side 212.

(32) Hence, FIG. 3A schematically depicts at least one domain 210 with one of the m1 adhesive layers 400 functionally coupled to the first domain side 211 and with another one of the m1 adhesive layers 400 functionally coupled to the second domain side 212.

(33) In the depicted embodiment, the light generating device 1000 further comprises a removable (adhesive) layer 240, which may have optical properties that differ from the underlying domains 210, especially from the underlying domain sides 212.

(34) Hence, an adhesive layer 240 arranged on a first domain side 211 may have different optical properties than the (respective) first domain side 211, whereas an adhesive layer 240 arranged on a second domain side 212 may have different optical properties than the (respective) second domain side 212.

(35) FIG. 3A further schematically depicts two embodiments of folded light generating devices 1000 that the unfolded light generating device 1000 of FIG. 3A may be folded into. Here adhesive layers 400 are provided both on the first side 211 and the second side 212 of a single domain 210.

(36) In particular, in a first embodiment of the folded light generating device 1000 (left side), the domains 210 may be configured to enclose the light source 100, especially shielding the light source 100 from outside view, whereas the light source 100 may be exposed in the second embodiment of the folded light generating device 1000 (right side). Further, in the depicted embodiments the adhesive layers may have been selectively removed. For example, the adhesive layers 240 may be reflective for the light source light 101, and may thus be selectively removed (or maintained) to provide desired optical characteristics.

(37) FIG. 3B further schematically depicts an embodiment of a light generating device 1000 with adhesive layers 400 arranged on opposite domain first sides 211 and second sides 212 of a plurality of domains 210. FIG. 3B further schematically depicts several embodiments of a folded light generating device 1000 the unfolded light generating device 1000 may be folded into.

(38) Hence, a single arrangement of the unfolded light generating device 1000, especially on a roll 1005, may provide flexibility with regards to the folded light generating devices 1000 that can ultimately be installed at a given location.

(39) Referring to some of the shapes shown in FIG. 3B, one or more of the first domain 2110, the second domain 2120, the third domain 2130, and optionally one or more further domains 210, are configured to beam shape the light source light 101. As schematically depicted, the mutual angles of some of the domains are each individually selected from the range of at least 90 and smaller than 180. Note that other angles may have different values.

(40) FIG. 3C schematically depicts an embodiment of the light generating device 1000 comprising comprise repeating width sections 1500 along the support width W1. For visualization purposes, only about 1.5 of the repeating width section 1500 is depicted for the unfolded light generating device 1000. The repeating width sections 1500 may enable folding of the light generating device 1000 into a repeating structure, as depicted in the lower half of FIG. 3C. It will be clear to the skilled person, that also many other configurations may be possible.

(41) In the depicted embodiment, several domains 210 may be folded atop one another. Such configurations may provide enhanced rigidity (or strength) of the structure. Hence, in embodiments, the light generating device 100 may comprise one or more sets 2200 of each two or more domains 210, wherein two adjacent domains 210 have mutual angles selected from the range of 05, especially 3, such as 1, including =0. In the depicted embodiments, the s1 light sources 100 are arranged at the first domain side 211 of the domains 210. However, in further embodiments, at least a first part of the s1 light sources 100 may be arranged at the first domain side 211 of the domains 210, and at least a second part of the s1 light sources 100 may be arranged at the second domain side 212 of the domains 210.

(42) FIG. 3D schematically depicts several further embodiments of the folded light generating device 1000, wherein the light generating device 1000 is attached to a ceiling 10 and/or a wall 20 by the adhesive layer 400. In some configurations said adhesive layer 400 is provided only on the first side 211 of the domains 210, in another configuration, i.e. wherein the lighting device 1000 is mounted in the corner between the ceiling 10 and the wall 20, the adhesive layer 400 is provided on both the first side 211 and the second side 212 of different domains 210.

(43) Further, FIG. 3D schematically depicts embodiments wherein two or more, especially three or more, of the first domain 2110, the second domain 2120, the third domain 2130, and optionally one or more further domains 210, enclose the one or more of the s1 light sources 100. In further embodiments, at least one of the first domain 2110, the second domain 2120, the third domain 2130, and the optionally one or more further domains 210, may be transmissive for the light source light 101.

(44) Hence, in embodiments, at least one of the n1 domains 210 may be transmissive for the light source light 101.

(45) FIG. 3E schematically depicts a further embodiment, wherein the unfolded and folded state are shown in the upper and lower part of the drawing, respectively. Here, the support may comprise three domains 210, wherein the left domain 210 of the support is 200 is reflective or comprises a reflective layer. This reflective domain 210 or domain 210 provided with reflective layer is indicated with reference 205. Also at another end of the support 200 such reflective domain 210 or domain 210 provided with reflective layer is available. The middle domain 210 comprises a support 200 that is transmissive for light source light 101. AN embodiment of a folded state is shown in the lower part of the drawing, wherein the adhesive layers 400 are used to keep the domains in this folded state and provide a device 1000 with a cavity wherein the light source 100 is configured. Reference 206 may refer to a (diffuse) transmissive layer (part). Hence, here an example is shown with a support with a domain that is reflective or comprise a reflective layer, and a domain that is (diffuse) transmissive. For attaining the diffuse transmission of a domain, at least one of the first domain side 211 and second domain side 212 or bulk material of said domain may be provided with a diffusive feature, like coating, embedded scattering particles, sandblasted or frosted surface structures.

(46) FIG. 4 schematically depicts an embodiment of a lighting device 1200. In particular, the lighting device 1200 may be selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, and an optical wireless communication device. The lighting device 1200 may especially comprise the light generating device 1000 according to the invention. Specifically, FIG. 4 schematically depicts a luminaire 2 comprising the light generating device 1000. Reference 301 indicates a user interface which may be functionally coupled with a control system 300 comprised by or functionally coupled to the light generating system 1000. FIG. 4 also schematically depicts an embodiment of a lamp 1 comprising the light generating device 1000. Reference 3 indicates a projector device or projector system, which may be used to project images, such as at a wall, which may also comprise the light generating device 1000.

(47) The term plurality refers to two or more. Furthermore, the terms a plurality of and a number of may be used interchangeably.

(48) The terms substantially or essentially herein, and similar terms, will be understood by the person skilled in the art. The terms substantially or essentially may also include embodiments with entirely, completely, all, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term substantially or the term essentially may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. Moreover, the terms about and approximately may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. For numerical values it is to be understood that the terms substantially, essentially, about, and approximately may also relate to the range of 90%-110%, such as 95%-105%, especially 99%-101% of the values(s) it refers to.

(49) The term comprise also includes embodiments wherein the term comprises means consists of.

(50) The term and/or especially relates to one or more of the items mentioned before and after and/or. For instance, a phrase item 1 and/or item 2 and similar phrases may relate to one or more of item 1 and item 2. The term comprising may in an embodiment refer to consisting of but may in another embodiment also refer to containing at least the defined species and optionally one or more other species.

(51) Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

(52) The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation.

(53) The term further embodiment and similar terms may refer to an embodiment comprising the features of the previously discussed embodiment, but may also refer to an alternative embodiment.

(54) It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

(55) In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

(56) Use of the verb to comprise and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words comprise, comprising, include, including, contain, containing and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of including, but not limited to.

(57) The article a or an preceding an element does not exclude the presence of a plurality of such elements.

(58) The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

(59) The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.

(60) The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and/or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings. Moreover, if a method or an embodiment of the method is described being executed in a device, apparatus, or system, it will be understood that the device, apparatus, or system is suitable for or configured for (executing) the method or the embodiment of the method, respectively.

(61) The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.