Patent Publication Number: US-2003223608-A1

Title: Turntable for loudspeaker display

Description:
BACKGROUND OF THE INVENTION  
       [0001] (1) Field of the Invention  
       [0002] The present invention relates to a display device for commercial loudspeaker display.  
       [0003] (2) Description of the Prior Art  
       [0004] In commercial settings, multiple stereo or surround sound loudspeakers are normally displayed in the same room for comparison, and they are placed side by side, and played one set at a time for potential customers. The problem with side-by-side placement is that for different loudspeaker sets, their distances to the listener and their acoustic interactions with the room environment are different, due to the fact that the loudspeakers are placed in different locations in the room.  
       SUMMARY OF THE INVENTION  
       [0005] Accordingly, the objective of the present invention is to provide a device to carry multiple loudspeakers, and to allows each loudspeaker carried thereon to be easily moved to the same location.  
       [0006] This objective is accomplished with the present invention by employing a horizontally rotary turntable with a platform large enough to carry multiple loudspeakers. The turntable is motorized and has sensors and control mechanism that can rotate each loudspeaker carried thereon to a particular location. 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0007]FIG. 1 is a top view of the turntable  1  carrying three loudspeakers  2   a ,  2   b  and  2   c.    
     [0008]FIG. 2 is the schematic of the stop sensor-switch  4 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
     [0009] Referring to FIG. 1 and FIG. 2, turntable  1  carries three loudspeakers  2   a ,  2   b  and  2   c , the rotation of which is driven by electric motor  14 , and when said electric motor  14  is turned off, the said turntable  1  stops immediately. Positioning of the loudspeakers is achieved by placing a locator  3  close to each loudspeaker  2 ,  3   a  to  2   a ,  3   b  to  2   b  and  3   c  to  3   b , at the circumference of the turntable  1 , and by placing the sole stop sensor-switch  4  on the floor with its sensor closely facing toward the circumference of the turntable  1 , and at a location when a locator  3  comes in align with the stop sensor-switch  4 , its corresponding loudspeaker  2  is placed right at the desired location for display. In this preferred embodiment, since the sensing medium is infra-red light from stop sensor-switch  4 , the locators  3   a ,  3   b  and  3   c  are white color reflective stickers, and can be placed anywhere to reflect the positions of the arbitrarily placed loudspeakers  2   a ,  2   b  and  2   c.    
     [0010] The stop sensor-switch  4  consists of infra-red emitter  10 , infra-red sensor  11 , manual switch  12  and electric relay  13  and several other common electronic components. When relay  13  is at armature-on, the motor  14  is power-on; and when armature-off, the motor  14  is power-off, and any one of the following two conditions can keep relay  13  stay at armature-on, (1) press down the manual switch  12  by operator; or (2) infra-red sensor  11  receives no infra-red light, that is no reflective locator  3  facing the stop sensor-switch  4 .  
     [0011] So at static state, the turntable  1  always rests at a position where a locator  3  facing the stop sensor-switch  4 , hence there is always one loudspeaker  2  is placed at the desired location. To rotate another loudspeaker  2  to the desired location, a operator press down the manual switch  12  to start the motor  14 , as soon as the locator  3  moves away from the stop sensor-switch  4 , manual switch  12  can be released and the motor  14  will keep rotating until the next locator  3  reaches the vicinity of stop sensor-switch  4 .