Abstract:
An image generating system having at least two fixed projection devices that are provided with still images which are projectable onto a surface where each projection device has a light generating source controlled by an electronic or mechanical sequencing controller to selectively illuminate each projector in a predetermined sequence.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    Not Applicable 
       STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
       [0002]    Not Applicable 
       INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISK 
       [0003]    Not Applicable 
       REFERENCE TO A MICROFICHE APPENDIX 
       [0004]    Not Applicable 
       BACKGROUND OF THE INVENTION 
       [0005]    1) Field of the Invention 
         [0006]    This invention relates to a system for movably projecting still images on a surface in such a manner that the still images may be displayed to simulate moving images. 
         [0007]    2) Description of Related Art 
         [0008]    U.S. 2006/0146295 disclose a method an device for combing images from at least two light projectors to provide an invisible transition zone between at least two light projectors. 
         [0009]    U.S. 2009/0015799 discloses a laser projection system that uses common household objects such as a lampshade as a projection screen. The disclosed system is useful as a pet exerciser system that relies on projection a series of moving images. 
         [0010]    U.S. 2009/0027629 discloses an image projection method and projector that is capable of changing the aspect ratio or resolution of a projection image. 
         [0011]    U.S. Pat. No. 6,552,699 discloses a multiple target projection system that has an image display that is formed by a projection assembly that uses a stationary mirror that reflects the image display to a movable mirror. 
       SUMMARY OF THE INVENTION 
       [0012]    The image generating system of the invention comprises at least two fixed projection devices that are provided with different still images which are projectable onto a surface. 
         [0013]    The light generating source in each projection device may be controlled by an electronic or mechanical sequencing controller to provide changing images on a surface in such a manner that the images appear to move on the surface. If a mechanical controller is used, a typical electric motor driven timer may be use to switch the projector on and off at predetermined intervals. An electronic system is preferred as it allows for greater flexibility in varying the on/off switching of the projectors. 
         [0014]    It is a first object of the invention to provide an image generating system that uses at least two fixed projectors having multiple image generating capability that permit the sequential generation of images at the same focal point or at different focal points. 
         [0015]    It is also an object of this invention to provide an image generating system where still images are generated in a rapid sequence that simulates movement. 
         [0016]    These and other objects and advantages of the invention will be readily apparent in view of the following description and drawings of the above-described invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is a diagram of the arrangement of three image generating projectors which are focused at three different focal points to allow for the generation of different images at different times in order to simulate movement from one focal point to another; 
           [0018]      FIG. 2  is a cross-section of the housing and two of the projectors that are located in the housing. 
           [0019]      FIG. 3  is a perspective view of the outer housing which shows the positioning of the holes that allow the projector lights to emit light during the operation of the animated projection system with the angle of the internal light tubes shown in phantom so that they are angled to focus at three different focal points to allow for the generation of an image at different times in order to simulate movement from one focal point to another according to  FIG. 1 . 
           [0020]      FIG. 4  is a perspective view of the outer housing which shows the positioning of the holes that allow the projector lights to emit light during the operation of the animated projection system with the angle of the internal light tubes shown in phantom so that they are angled to focus at the same focal point to allow for the generation of an image that appears to move as a result of the sequential change of the images that are projected by the image generating projectors. 
           [0021]      FIG. 5  is a diagram of a circuit for operating a three image projector according to the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0022]    A preferred embodiment of the invention is shown in  FIG. 1  which has a first projector  2 ; a second projector  4  and a third projector  6 . Each projector is mounted on a flat circular base  8  that is sized to hold the three projectors and a programmable sequence circuit  10 . The projectors are supported by a base element that maintains the projectors at a pre-fixed angle. Access holes  7 A,  7 B,  7 C and  7 D are provided in the base for attaching the outer housing  12  to circular base  8  to complimentary receiving holes (not shown) that will accept fastening screws. 
         [0023]    The projectors are adapted so that they may project an image on any common household surface such as a wall, ceiling, curtain, lampshade or door for the same time interval or at different time intervals. 
         [0024]    An outer housing  12  with three circular openings  14 ,  16  and  18  is sized to fit over the flat circular base  8  to form a circumferential joint  9 . The preferred connection between the outer housing  12  and the circular base  8  is a half-lap joint  9 A that is formed around the circumferential edges  22  and  24  of the outer housing  12  and the circular base  8 . A battery compartment  11  is provided with access (not shown) from the bottom of the base. 
         [0025]    The light emitting ends of the first projector  2 , second projector  4  and third projector  6  which are positioned in holes  18   a,    18   b  and  18   c  in the upper part of outer housing  12  as shown in  FIG. 3 . The holes  18   a,    18   b  and  18   c  are preferably arranged so that they are located as if on an arc of a circle at intervals of about 120° on the upper part of the outer housing  12 . Two of the projectors in  FIG. 2  are shown in cross-section in with a light source. The projectors may aimed by arranging the three projectors so that the longitudinal axis of each projector is inclined relative to the central vertical axis of the outer housing at an angle of about 10-30° and preferably 15-20° so that each projector is aimed at a different focal point as shown by the phantom lines in  FIG. 3 . 
         [0026]      FIG. 4  shows an arrangement where the projectors are shown by phantom lines to be arranged to have the same focal point so that an image may be simulated at the same focal point that appears to move by switching the projectors on and off in sequence. 
         [0027]    Each projector comprises a tube  24  having there in a light source  26  which is preferable an LED that is connected to a controlled power source by conductors (not shown) and at least 1 double convex aspheric collimating lens  28  to project light from the source onto a transparent medium  35  with projectable image applied to the first surface  36 . The transparent medium is held by two plastic carriers  33  and  34  which force the correct orientation of the first surface  36  and restrict the light passing through the film to a beam of diameter that can optimally illuminate the first surface of the at least 1 double convex aspheric projection lens  30 . The projection lens  30  serves to magnify the image which is projected outwardly. The preferred distance from the projection lens  30  to an image plane is about 3 to 6 feet and preferably about 5 feet. 
         [0028]    The projection system is activated by a pressure sensitive on/off switch  32  that is preferably located in a cut out section of the base  8  and the outer housing  12  that is located at the circumferential joint  9  between base  32  and outer housing  12 . The light sources  26  are controlled by a microprocessor as shown in  FIG. 5 . Power may be supplied in the form or DC or AC that is provided by one or more batteries or electric current generated by conventional or alternate sources. 
         [0029]    This projection light consists of 3 small projectors in a single housing. They project  3  images in close proximity one at a time in a programmed sequence onto an image plane located in front of the light at a distance of approximately 5 feet. The projectors are preloaded with fixed images that are backlit by LED light sources. The images may be cartoon characters, symbols, letters or geometric forms, such as balls, circles, dots or the like in color or in black and white, that are made from an appropriate negative image. These light sources are controlled by a microprocessor that is programmed to display the images in a sequence that is permanently programmed into memory. 
         [0030]    When the on/off switch  32  is activated the processor sets a timer for 20 minute operation time to carry out the following action sequence which is designed to cycle through the three projectors in a way that the same image is not always projected in the same sequence. 
         [0031]    After the action sequence has started, the processor can be deactivated by pressing switch  32  at any time. A preferred action sequence is as follows:
       1. Press on/off switch momentarily to start sequence.   2. Set program run time timer to 20 minutes enable timer interrupt to enter sleep mode when program has run for 20 minutes.   3. Picture 1 from projector  2  turns on and stays on for 10 seconds then turns off.   4. Picture 2 from projector  4  turns on for 1 second then turns off.   5. Picture 3 from projector  6  turns on for 1 second then turns off.   6. Picture 1 from projector  2  turns on for 1 second then turns off.   7. Picture 2 from projector  4  turns on and stays on for 10 seconds then turns off.   8. Picture 3 from projector  6  turns on for 1 second then turns off.   9. Picture 1 from projector  2  turns on for 1 second then turns off.   10. Picture 2 from projector  4  turns on for 1 second then turns off.   11. Picture 3 from projector  6  turns on for and stays on for 10 seconds then turns off.   12. Picture 1 from projector  2  turns on for 1 second then turns off.   13. Picture 2 from projector  4  turns on for 1 second then turns off.   14. Picture 3 from projector  6  turns on for 1 second then turns off.   15. Go to step 3   Sequence steps 3-15 will continue for 20 minutes after the sequence is started.   After 20 minutes, the microprocessor will stop the cycle, turn off the lights and place processor in sleep mode. Pressing switch  32  will wake processor from sleep and start the sequence.       
 
         [0049]    As best seen in  FIG. 5 , the circuit for operating the projection light preferably has a 4.5V input to the control circuit that may be provided by three AAA batteries but the power could be from a different style battery or other power source such as a plug in AC to DC power adapter or solar/wind power source. 
         [0050]    Power from the battery is supplied to R 1 , EC 1 , C 1  and ZD which provide filtered 3.3V DC to power the microprocessor IC 1 . On IC 1  Pin  1  is 3.3V (Vdd) and Pin  8  is 0 V (Vss). While the circuit in this invention uses 3.3V in other iterations this voltage could be changed to reflect the specific power requirements. Pin  2  and  4  of the processor are not used. 
         [0051]    Input for power on and off is provided through pin  3 . Pin three is normally held in the high state by internal pull up resistors. When momentary switch S 1  (On/OFF) is pressed it will connect pin three to Vss which will force it to the low level. 
         [0052]    When the batteries are installed or power is applied to input the processor is initialized. All outputs are set to the low (off) state, pin  3  is set as an input pin and interrupt on pin  3  low is enabled. Then the processor is placed in the Low power “Sleep” mode. 
         [0053]    If the processor is in Low power “Sleep” mode when S 1  is pressed the interrupt will cause It to “wake up”, initialize the program and continue to sequence through the program until either 1) the processor receives a second interrupt because S 1  was pressed again or 2) the Program time counter has reached the preprogrammed length of time for light operation. 
         [0054]    If either of these events occurs then the processor will stop the sequence, set all outputs to off (low) make sure the interrupt on pin  3  is enabled and enter the low power (Sleep) mode. 
         [0055]    While the program is running it will change the states of output pins  5 ,  6 , and  7  according to a preprogrammed sequence. If output pin  7  is set to high it turns on transistor Q 1  with gate current limited by R 3 . The current through Q 1  turns on LED 1 . 
         [0056]    The current through LED 1  is limited by resistor R 6 . If Output pin  7  is set to low it turns off Q 1  and LED 1 . If output pin  6  is set to high it turns on transistor Q 2  with gate current limited by R 4 . The current through Q 2  turns on LED 2 . The current through LED 2  is limited by resistor R 7 . 
         [0057]    If Output pin  7  is set to low it turns off Q 2  and LED 2 . If output pin  5  is set to high it turns on transistor Q 3  with gate current limited by R 5 . The current through Q 3  turns on LED 3 . The current through LED 3  is limited by resistor R 8 . If Output pin  7  is set to low it turns off Q 3  and LED 3 . As the program sequence is followed the images projected on the projection plane will turn on and off giving the appearance of moving around on the projection Plane.