FORM 2
THE PATENTS ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE OF THE INVENTION ROOF LAMP
APPLICANT
TATA MOTORS LIMITED,
an Indian company having its registered office at
Bombay house, 24 Homi Mody Street,
Hutatma Chowk, Mumbai 400 001,
Maharashtra, INDIA.
INVENTORS
PRANITA A DESHPANDE & BOCHRE AVINASH BHANUDAS
both are Indian Nationals of
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in
which it is performed.

FIELD OF THE INVENTION
The present invention relates to roof lamps of a vehicle and more particularly to a roof lamp on middle row seats (on roof) and two passive lamps at both ends of roof (Front side & rear side of vehicle) seating/ boot area.
BACKGROUND OF THE INVENTION
Currently, SUV and MUV vehicle platform constitutes of two or three roof lamps in the vehicle (One is above Driver-Co-driver end, second is above middle row seats and or third is on or near to rear wall). Hence if there is no necessity of the roof lamp at some location it needs to be shut off individually according to the requirement.
Accordingly, there is need of a roof lamp that provides economical solution to vehicle illumination.
OBJECTS OF THE DISCLOSURE
The main object of the present disclosure is to provide illumination requirement in a vehicle cabin.
Another object of the present disclosure is to provide illumination requirement in a vehicle cabin with single active multifunctional source lamp.
Yet another object of the present disclosure is to provide illumination requirement in a vehicle cabin with single active multifunctional source lamp and with multiple number of passive lamps.

BRIEF DESCRIPTION OF THE DRAWINGS
The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
FIG. 1 illustrates a schematic representation of a roof lamp along with reflectors, in one embodiment of the present disclosure
FIG. 2 illustrates a schematic representation of a layout of a vehicle showing vehicle illumination by the roof lamp of Figure 1, in one embodiment of the present disclosure
FIG. 3 illustrates a schematic representation of an active source lamp/roof lamp assembly, in another embodiment of the present disclosure
FIG. 4 illustrates a schematic representation of front view for Reading lamp provision of vehicle showing reflector focus for reading purpose in a vehicle
FIG. 5 illustrates a schematic representation of a source LED lamp and lower projector glass.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the system illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION OF INVENTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
The present invention discloses a roof lamp comprising at least one primary source of light energy (RL) configured to emit light in the vehicle; plurality of secondary sources of light energy (R1, R2) configured to receive the light from said primary source of light energy (RL) and emit said light by reflection and refraction; at least one switch 'X' located configured to select various modes of primary source of light energy (RL) and said secondary sources of light energy (R1, R2) and in their combination.
The primary source of light energy (RL) is an active lamp located at the centre of roof of the vehicle. The secondary sources of light energy (R1, R2) are passive lamps consisting of reflector (R1) located at front side of the vehicle and reflector (R2) located at the rear side of the vehicle. The primary source of light energy

(RL) is configured to be mounted with two lenses to project light to secondary sources of light energy (R1, R2) for reflecting the light and illuminating. The secondary sources of light energy (R1, R2) are configured from highly reflective material for reflecting and illuminating the light received from primary source of light energy (RL). The primary source of light energy (RL) is configured with three light emitting diodes (LED) lamps (L1, L2, L3) wherein LED lamp L3 for emitting plain beam of light to illuminate the central area and LED lamps L1 and L2 constitute of projector lens to focus the light beam on the secondary sources of light energy consisting of reflectors R1 and R2. The primary source of light energy (RL) is optionally configured with two additional projectors for projecting light to two additional secondary sources of light energy on the door trim for providing as door hazard lamp and pedal lamp. The secondary sources of light energy consisting of reflector (R1) and reflector (R2) are optionally used as reading lamp by focusing the illumination of these reflectors R1 and R2 to the predetermined location. The switch 'X' is a shifter knob/rotary switch located on the source lamp to select the required predetermined mode of the lamp. The primary source of light energy (RL) is configured with three number of projector lenses, lens 'B' for projecting on front reflector, lens 'A' on rear reflector and lens „C for projecting on lower surface of vehicle. The primary source of light energy (RL) is configured with a lower surface of the having projector 'C' to illuminate the middle row area consisting of special projector lenses 'D' & 'E' for focusing the projected light on door area.
The switch „X‟ is configured to select plurality of switching positions of the lamp
consisting of
Switching ON the LED lamp 'L1'
Switching ON Rear side LED lamp 'L2'
Switching ON Front side LED lamp 'L3'
Switching ON Lower LED lamp 'L1' & Rear LED lamp 'L2'
Switching ON Lower LED lamp 'L1' & Front LED lamp 'L3'
Switching ON Front 'L3' & Rear 'L2' LED lamps.

This invention is applicable to the all the MUV/SUV vehicle platform which are having two or three roof lamps one is above Driver-Co-driver end, second is above middle row seats and or third is on or near to rear wall. The proposed invention is to have one common source roof lamp on middle row seats (on roof) and two passive lamps at both ends of roof (Front side & rear side of vehicle) seating/ boot area. The schematic constitute of source lamp (Active lamp RL) and other lamp will act as a Passive lamps.
There may be one Roof lamp (RL: Source lamp) act as an active roof lamp which is located at the centre of Roof and there shall be two reflectors (R1) located at Front side and (R2) located at the rear side, refer to Fig 1.0 for details. These reflectors play role as a passive roof lamps. There may be two switching modes on the source lamp (RL) first to switch “ON” lamp itself and second to focus the light on the reflectors (R1) and (R2). This source lamp (RL) have two lenses mounted on its sides, so that this lens may project light to passive lamps These reflectors may in turn reflect the light and illuminate the surrounding area. The passive lamps are made of strong reflective material so that, light came from source light may be diverted to passenger. Refer fig 2.0 for Roof lamp schematic details.
This Source lamp (RL) will constitute of three LED lamps (L1, L2, L3) refer fig 2 for details. L1 and L2 LED lamps constitute of projector lens to focus the light beam on the reflectors R1 and R2 respectively. L3 lamp will be normal LED to illuminate the central area. The shifter knob/rotary switch 'X' located on the source lamp helps to shift the required mode of the lamp. This source Roof lamp can be used as Door Hazard and pedal lamp by mounting two additional projectors and reflector on the door trim. Reflector 1 and Reflector 2 can be used as Reading lamp also by designing these reflectors for focusing the illumination to the specific location.

The Source lamp Fig. no. 03 is having Active light source (Power LED 1, 2 & 3) .these LED‟s are switched by Rotary switch 'X', installed on lower surface of the active lamp assembly.
As shown in Fig. 02 There will be Active source lamp installed in middle row of the said vehicle and two reflectors installed on the rear as well as front roof. These reflectors play role of passive lamps.
There will be three number of projector lenses provided each on front 'B', Rear 'A' & lower surface 'C' (projector lens 'D' & 'E' are part of lens 'C') respectively. Refer to Fig 5.
There will be special provision made on Rear 'A' and Front 'B' reflectors for providing the reading lamp illumination on each seating area in front as well as third row. Refer Fig no. 2.
There will be no. of switching positions on Rotary switch 'X'.
 1st - To switch ON the LED lamp '1'
 2nd - To switch ON Rear side LED lamp '2'
 3rd - To switch ON Front side LED lamp '3'
 4th - To switch ON Lower LED lamp '1'& Rear LED lamp '2'
 5th - To switch ON Lower LED lamp '1' & Front LED lamp '3'
 6th -To switch ON Front '3' & Rear '2'LED lamps.
Lower surface of the active source lamp having projector 'C', which consist of 'D' & 'E' special projector lenses. This projector 'C' is provided to illuminate the middle row area. These special projectors 'D' & 'E' will provided for focusing the projected light on door area, where reflector are fitted. Projector 'A' & 'B' are provided for projecting light on Rear and front reflectors respectively.

Following are different operating modes /conditions of roof lamp:
1. Source lamp Active (RL): In this condition only L3 LED lamp will be "ON" and L2 and L3 lamps will be "OFF".
2. Front roof lamp Active: In this condition only L1 LED lamp shall be "ON" and this can focus the light beam on the reflector located on the front area (Rl) to illuminate the respective front area.
3. Rear roof lamp Active: In this condition only L2 LED lamp shall be "ON" and this can focus the light beam on the reflector located on the front area (Rl) to illuminate the respective front area.
4. Front and Centre roof lamp Active: In this condition L3 and L1 LED lamp shall be "ON" to illuminate the respective centre and front area.
5. Rear and centre roof lamp Active: In this condition L3 and L2 LED lamp shall be "ON" to illuminate the respective centre and rear area.
6. Rear and front roof lamp Active: In this condition L1 and L2 LED lamp shall be "ON" to illuminate the respective front and rear area.
ADVANTAGES:
1. Only one Roof lamp shall be active which can be activated and non-activated according to the requirement.
2. Second/third roof lamp will be passive Roof Lamp and there shall be Energy Conservation.
3. There will be cost reduction (Deletion of one/two Roof lamps, wiring required)
4. Multi-Purpose lamp (Roof Lamp, Reading Lamp, Door Hazard)
5. Reduction in warranty complaints.

Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention

analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

We Claim:
1. Roof Lamp comprising
at least one primary source of light energy (RL) configured to emit light in the vehicle;
plurality of secondary sources of light energy (R1, R2) configured to receive the light from said primary source of light energy (RL) and emit said light by reflection and refraction;
at least one switch 'X' located configured to select various modes of primary source of light energy (RL) and said secondary sources of light energy (R1, R2) and in their combination.
2. The roof lamp as claimed in claim 1 wherein said primary source of light energy (RL) is an active lamp located at the centre of roof of the vehicle.
3. The roof lamp as claimed in claim 1 wherein said secondary sources of light energy (R1, R2) are passive lamps consisting of reflector (R1) located at front side of the vehicle and reflector (R2) located at the rear side of the vehicle.
4. The roof lamp as claimed in claim 1 wherein said primary source of light energy (RL) is configured to be mounted with two lenses to project light to secondary sources of light energy (R1, R2) for reflecting the light and illuminating.
5. The roof lamp as claimed in claim 1 wherein said secondary sources of light energy (R1, R2) are configured from highly reflective material for reflecting and illuminating the light received from primary source of light energy (RL).
6. The roof lamp as claimed in claim 1 wherein said primary source of light energy (RL) is configured with three light emitting diodes (LED) lamps (L1, L2, L3) wherein LED lamp L3 for emitting plain beam of light to illuminate

the central area and LED lamps L1 and L2 constitute of projector lens to focus the light beam on the secondary sources of light energy consisting of reflectors R1 and R2.
7. The roof lamp as claimed in claim 1 wherein said primary source of light energy (RL) is optionally configured with two additional projectors for projecting light to two additional secondary sources of light energy on the door trim for providing as door hazard lamp and pedal lamp.
8. The roof lamp as claimed in claim 1 wherein said secondary sources of light energy consisting of reflector (R1) and reflector (R2) are optionally used as reading lamp by focusing the illumination of these reflectors R1 and R2 to the predetermined location.
9. The roof lamp as claimed in claim 1 wherein said switch 'X' is a shifter knob/rotary switch located on the source lamp to select the required predetermined mode of the lamp.
10. The roof lamp as claimed in claim 1 wherein said primary source of light energy (RL) is configured with three number of projector lenses, lens „B‟ for projecting on front reflector, lens „A‟ on rear reflector and lens „C for projecting on lower surface of vehicle.
11. The roof lamp as claimed in claim 1 wherein said primary source of light energy (RL) is configured with a lower surface of the having projector C to illuminate the middle row area consisting of special projector lenses 'D' & „E‟ for focusing the projected light on door area.
12. The roof lamp as claimed in claim 1 wherein said switch 'X' is configured to select plurality of switching positions of the lamp consisting of
• Switching ON the LED lamp 'L1'

• Switching ON Rear side LED lamp 'L2'
• Switching ON Front side LED lamp 'L3'
• Switching ON Lower LED lamp 'L1' & Rear LED lamp 'L2'
• Switching ON Lower LED lamp 'L1' & Front LED lamp 'L3'
• Switching ON Front 'L3' & Rear 'L2' LED lamps.