Star field projection apparatus

Abstract

A projection apparatus for generating a moving star field and a cloud-like effect comprises a means for generating a cloud-like effect using at least one non-coherent light source, a means for generating a moving star field using at least one coherent light source and a means for regulating and supplying electric power. The means for generating cloud-like effect using at least one non-coherent light source comprises at least one pair of condenser lenses and an interferential filter wheel rotated by a motor, disposed between at least one pair of condenser lenses. The means for generating the moving star field using a coherent light source comprises a grating wheel rotated by a motor and a diffractive optical element disposed between the at least one coherent light source and the grating wheel.

Description

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a functional block diagram of the star field projection apparatus of the present invention.

FIGURE—REFERENCE NUMERALS

10 . . . Star Field Projection Apparatus

12 . . . Interferential Filter Wheel

14 . . . Grating Wheel

16 . . . Laser Diode

18 . . . Light Emitting Diode (LED)

20 . . . First Motor

22 . . . Second Motor

24 . . . Full Wave Bridge Rectifier and Filter

26 . . . Motor Current Control Unit

28 . . . LED Current Regulator

30 . . . Laser Diode Power Supply

32 . . . Inner Condenser Lens

34 . . . Outer Condenser Lens

36 . . . Diffractive Optical Element

DETAILED DESCRIPTION

Referring to the drawing, a preferred embodiment of a star field projection apparatus of the present invention is illustrated and generally indicated as in FIG. 1. The present invention produces a moving star field along with a deep blue cloud-like effect.

Referring to FIG. 1, the star field projection apparatus 10 comprises coherent and non-coherent light sources, a power supply and regulation means, a pair of condenser lenses, inner 32 and outer 34, an interferential wheel 12, a grating wheel 14, a pair of diffractive optical elements 36 and a pair of motors. The coherent light source comprises a monochromatic laser 16 and the non-coherent light sources comprise a pair of light emitting diodes (LED) 18.

The power supply and regulation means comprise an alternating current supply, a full wave bridge rectifier and filter circuit 24, a motor current control unit 26, an LED current regulator 28 and a laser diode power supply 30. The alternating current input is rectified and filtered by the full wave bridge rectifier and filter circuit 24 to get a desired direct current output. The direct current output is fed to the LED current regulator 28, laser diode power supply 30 and the motor current control 26.

The arrangement comprising the LED 18, first motor 20, interferential filter wheel 12 and inner 32 and outer condenser lenses 34 create a deep blue cloud-like effect. The interferential filter wheel 12 is positioned between the inner 32 and outer 34 lenses as shown in FIG. 1. The outer lens 34 is bigger than the inner lens 32. In one embodiment, a 50mm condenser lens is used for the outer lens 34 and a 10 mm condenser lens is used for the inner lens 32. The interferential filter wheel 12 is rotated by the first motor 20. The beam of light from the LED 18 passes through the inner lens 32 and the rotating interferential filter wheel 12, and is eventually collected and redirected by the outer condenser lens 34 to create a cloud-like effect. The cloud has a slow motion because of the periodic rotation of the interferential filter wheel 12. The cloud is of deep blue color but can be produced in other colors and with other characteristics.

Still referring to FIG. 1, the star field motion is produced by using the grating wheel 14, a second motor 22, the diffractive optical elements 36 and the lasers 16. The second motor 22 is used for rotating the grating wheel 14. The motor current control unit 26 controls the operation of the second motor 22. The diffractive optical elements 36 are positioned between the grating wheel 14 and the lasers 16. The light beam from the lasers 16 passes through the diffractive optical elements 36. The light output from the diffractive optical elements 36 passes through the rotating grating wheel 14 to generate bright spots because of the interference of the diffracted light beams. The bright spots generated appear as stars. The periodic rotation of the grating wheel 14 causes the motion of the star field. The motor control unit is used to control the speed or rpm of the second motor. The stars are layered on the deep blue cloud.

All features disclosed in this specification, including any accompanying claims, abstract, and drawing, may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

Any element in a claim that does not explicitly state “means for” performing a specified function, or “step for” performing a specific function, is not to be interpreted as a “means” or “step” clause as specified in 35 U.S.C. §112, paragraph 6. In particular, the use of “step of” in the claims herein is not intended to invoke the provisions of 35 U.S.C. §112, paragraph 6.

Although preferred embodiments of the present invention have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.

Claims

1. A projection apparatus for generating a moving star field and a moving cloud-like effect, comprising: a. a means for generating a moving cloud-like effect using at least one non-coherent light source;b. a means for generating a moving star field using at least one coherent light source; andc. a means for regulating and supplying electric power.

2. The apparatus of claim 1, wherein the means for generating the moving cloud-like effect using the at least one non-coherent light source comprises at least one pair of condenser lenses, an interferential filter wheel and a motor for rotating the interferential filter wheel, the interferential wheel being disposed between the at least one pair of condenser lenses.

3. The apparatus of claim 2, wherein the at least one pair of condenser lenses comprises an outer condenser lens and an inner condenser lens smaller than the outer condenser lens.

4. The apparatus of claim 3, wherein the light from the at least one non-coherent light source is made to pass through the inner condenser lens and the rotating interferential filter wheel, and is eventually collected and redirected by the outer condenser lens to create a cloud-like effect.

5. The apparatus of claim 3, wherein the at least one non-coherent light source is behind the inner condenser lens.

6. The apparatus of claim 2, wherein the motor for rotating the interferential wheel is an AC motor.

7. The apparatus of claim 2, wherein the apparatus further comprises a motor control unit for controlling the speed or rpm of the motor that rotates the interference filter wheel.

8. The apparatus of claim 1, wherein the means for generating the moving star field using the at least one coherent light source comprises a grating wheel, at least two diffractive optical elements disposed between the at least one coherent light source and the grating wheel, and a motor for rotating the grating wheel.

9. The apparatus of claim 8, wherein the light emitted by the at least one coherent light source passes through the diffractive optical elements and the rotating grating wheel to generate the moving star field.

10. The apparatus of claim 9, wherein the moving star field is caused by the periodic rotation of the grating wheel.

11. The apparatus of claim 8, wherein the apparatus further comprises a motor control unit for controlling the speed or rpm of the motor that rotates the grating wheel.

12. The apparatus of claim 8, wherein the motor rotating the grating wheel is a DC motor and power is supplied to the motor through a full wave bridge rectifier and filter.

13. The apparatus of claim 1, wherein the means for regulating and supplying electric power comprises an alternating current input, and a full wave bridge rectifier and filter.

14. The apparatus of claim 1, wherein the coherent and non-coherent light sources comprise monochromatic lasers and light emitting diodes (LEDs), respectively.

15. The apparatus of claim 14, wherein power is supplied to the LEDs through a full wave bridge rectifier and filter and an LED current regulator.

16. The apparatus of claim 14, wherein power is supplied to the lasers through a full wave bridge rectifier and filter and a laser diode power supply.

17. The apparatus of claim 1, wherein the star field is layered on the cloud-like effect.

18. The apparatus of claim 1, wherein the cloud-like effect is of deep blue color.