Patent Publication Number: US-7914181-B2

Title: Display with lighting device

Description:
STATEMENT OF RELATED APPLICATION 
     The present application claims the priority of the Chinese Patent Application No. CN200720119538.X, filed on Apr. 12, 2007, entitled “Display with Lighting Device”, the disclosure of which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     This invention relates to the field of medical diagnostic apparatuses, and more particularly to a display used in a medical diagnostic apparatus. 
     BACKGROUND OF THE INVENTION 
     In order that doctors can read and operate diagnostic apparatuses (such as an ultrasonic diagnostic apparatus) conveniently in a darkroom, a lighting device is required to illuminate the whole keyboard area of the diagnostic apparatus. The lighting devices of the prior art fall into two types: 1) the table lamp available in the market may be directly used as an auxiliary lighting source; 2) a lighting lamp similar to a table lamp may be arranged on one side of the keyboard, the lighting lamp having a supporting bar such that the lighting lamp illuminates the keyboard at a certain height. However, both the two types are deficient in loose structure and extra-occupied space, thereby interfering with normal operations by doctors. 
     SUMMARY OF THE INVENTION 
     An objective of the present invention is to provide a display in tight structure without occupying extra space to overcome the deficiencies of the prior art. 
     According one aspect of the present invention, the technical solution adopted in the present invention for solving the technical problem is to provide a display with a lighting device comprising a display body and a lighting device, wherein the display body has a housing and a power supply panel, and the lighting device mounted at the bottom of the housing consists of a base having a receiving cavity and a light source body disposed within the receiving cavity and powered by a power supply. 
     The light source body is electrically connected to and powered by the power supply panel of the display body. 
     The lighting device further comprises a lighting circuit board and a control switch fixed to the base, the lighting circuit board connecting the light source body with the power supply panel via the control switch, the control switch having a first switch link connected to the lighting circuit board and a second switch link connected to the power supply panel. 
     The base comprises a frame fixed to the bottom of the housing and a light-transparent lamp shade fixed below the frame, above the frame being fixed the lighting circuit board, and the lamp shade and the frame enclosing to form the receiving cavity. 
     The lighting circuit board has a lamp holder on the side facing the frame, at the position of the frame corresponding to the lamp holder is disposed with a first through hole through which the lamp holder extends into the receiving cavity, and the light source body used as a tube is mounted inside the lamp holder. 
     The lamp shade has a second through hole, in which the control switch mounted on the frame is exposed. 
     The frame has a switch fixing hole and the control switch has a resilient fastener, the resilient fastener being fastened into the switch fixing hole. 
     Part of the wall of the receiving cavity is arc-shaped and reflective. 
     The housing of the display body comprises a front housing and a rear housing, with a gap formed between the bottoms of the two housings and the lighting device attached within the gap. 
     According another aspect of the present invention, there is provided a display with a lighting device comprising a display body having a housing and a power supply panel, and a lighting device mounted on the bottom of the housing. The lighting device consists of: a base having a receiving cavity; a light source body disposed within the receiving cavity and powered by a power supply; a lighting circuit board and a control switch mounted on the base, the lighting circuit board connecting the light source body with the power supply panel via the control switch, the control switch having a first switch link connected to the lighting circuit board and a second switch link connected to the power supply panel. 
     Preferably, the base comprises a frame and a light-transparent lamp shade which enclose to form the receiving cavity, on the frame being mounted the lighting circuit board and the lamp shade being connected to the underside of the frame, the frame having a switch fixing hole into which, the resilient fastener of the control switch is fastened. 
     Further, the lighting circuit board has a lamp holder, and the light source body is an elongate tube or a LED spot light source mounted within the lamp holder. 
     Preferably, part of the wall of the receiving cavity is arc-shaped and reflective. 
     The housing of the display body comprises a front housing and a rear housing, with a gap fainted between the bottoms of the two housings, and the lighting device being attached within the gap. 
     The present invention is conducive to mounting the lighting device at the bottom of the display with the light downwards illuminating the whole keyboard area of the medical diagnostic apparatus such that the structure is tight without occupying extra space, thereby no inconvenience occurs during doctors&#39; operation. Additionally, since the whole lighting device may be mounted within the display in a modularized manner and the control switch employs a resilient fastener for connection, it is convenient for installation, disassembly, renewal and maintenance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of the display with a lighting device mounted on a medical diagnostic apparatus according to the embodiment of the present invention. 
         FIG. 2  is a bottom view of the display with a lighting device according to the embodiment of the present invention. 
         FIG. 3  is a sectional view taken along the line A-A in  FIG. 2 . 
         FIG. 4  is a wiring diagram of the control switch of the lighting device according to the embodiment of the present invention. 
         FIG. 5  is an exploded perspective view of the lighting device according to the embodiment of the present invention. 
         FIG. 6  is schematic view of the lighting device before being mounted in the front housing of the display body according to the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     See  FIGS. 1-6 . The display with a lighting device according to the embodiment of the present invention comprises a display body  1  and a lighting device  2 . The display body  1  comprises a housing and a power supply panel. The housing is constituted by a front housing  11  and a rear housing  12 , with a gap  13  formed between the bottoms of the front housing  11  and the rear housing  12 . The lighting device  2  is embedded into and fixed in the gap  13 . The power supply panel is mounted to the front housing  11 . 
     The lighting device  2  comprises a frame  20 , a lighting circuit board  21 , a light-transparent lamp shade  22 , a pair of tubes  23  and a control switch  24 . The frame is made of plastic and has a lower surface  200  facing the lamp shade  22  and an upper surface  201  facing the lighting circuit board  21 . The lower surface  200  is provided with a receiving cavity  202  and a switch fixing hole  203  on one side of the receiving cavity  202 . Part of the wall  204  of the receiving cavity  202  is arc-shaped and reflective. Two lamp shade fixing poles  205  are disposed at the bottom of the receiving cavity  202 . The upper surface  201  is provided with four first through holes  206  arranged in line and communicating with the receiving cavity  202  and three circuit board fixing poles  207  arranged as a triangle The lighting circuit board  21  is provided with four lamp holders  210  respectively aligned with the four first through holes  206  on the side facing the frame  20 . The lamp holder  22  is made of transparent plastic, and is provided with countersunk screw bores  220  at the position corresponding to the lamp shade fixing poles  205  of the frame and a second through hole  221  at the position corresponding to the switch fixing hole  203  of the frame. In the middle of the tube  23  lies in a cylindrical glass tungsten filament tube, both ends of which are metal layers snapped tightly to the lamp holder  210  of the lighting circuit board to form a circuit. The control switch  24  is used to control the connection and disconnection of the circuits of the two tubes, having a resilient fastener  240  arranged to snap tightly for installation, a first switch link  241  connected to the lighting circuit board at the end thereof and a second switch link  242  connected to the power supply panel  21  of the display body. In addition, the frame  20  is further provided with three bolt-mounting positions  208  and two hanging ears  209 . 
     The lighting device is installed successively as follows. First, the circuit board  21  is put on the upper surface  201  of the frame, with the four lamp holders  210  thereof respectively passing through the four first through holes  206  of the frame and extending into the receiving cavity  202  of the frame. Then, three screws  25  pass through the through holes  211  of the lighting circuit board and are locked into the three circuit board fixing poles  207  of the frame, thereby fixing the circuit board  21  on the upper surface  201  of the frame. The two tubes  23  are pressed respectively into the four lamp holders  210 , with one of them  23  being supported by two lamp holders  210 . The control switch  24  is pressed into the switch fixing hole  203  of the frame and snapped tightly via the resilient fastener  240  of the control switch  24 . The transparent lamp shade  22  is put on for covering and fixed to the lower surface  200  of the frame using two countersunk bolts  26  passing through the countersunk screw bores  220  of the lamp shade and then being locked into the two lamp shade fixing poles  205  of the frame, thereby the lighting device  2  having the enclosed receiving cavity  202  is assembled. 
     When mounting the lighting device  2  on the display body  1 , the lighting device  2  is fixed to the front housing  11  of the display body using three bolts  27 , and the two hanging ears  209  of the frame hang against the rib  14  at the inner side of the bottom of the front housing, thereby the lighting device  2  being fixed reliably to the front housing  11 . 
     The pin of the first switch link  241  of the control switch  24  is plugged into the socket  212  of the lighting circuit board  21 , and the first switch link is connected respectively to the two lamp holders of each of the tubes to form a positive electrode and a zero electrode such that lighting voltage is supplied for the tubes via the lighting circuit board. The pin of the second switch link  242  is plugged into the power supply panel of the front housing  11  such that lighting voltage is supplied for the lighting circuit board via the power supply panel. 
     When in use, the display with a lighting device according to the present embodiment is mounted on the medical diagnostic apparatus  3  (e.g. a bogie type-B ultrasonic). When the tube of the lighting device is lit, part of the light emitted from the tube penetrates directly out of the transparent lamp shade  22 , and remaining part penetrates out of the lamp shade  22  after being reflected by the arc-shaped reflective wall  204  of the frame, thereby illuminating the whole keyboard area  4  of the medical diagnostic apparatus. 
     The present invention is not limited to above embodiments. On the contrary, variations of the present invention are allowed on the basis of the aforementioned. For example, the light source body is not limited to an elongate tube, and other spot light sources such as LED may also be employed. In addition, the transparent lamp shade  22  is not a must, which may be omitted to have the light source body contact directly with the outside. In such a case, since the base is configured to have a receiving cavity  202 , the light source body disposed in the concave-receiving cavity  202  may also be protected against damage. Besides, the lighting circuit board  21  may also be disposed on one side of the frame  20  based on requirement, instead of being disposed right above the frame  20  as described hereinbefore. 
     In the present embodiment, the lighting device is mounted at the bottom of the display body, with the light downwards illuminating the whole keyboard area of the medical diagnostic apparatus such that the structure is tight without occupying extra space, thereby no inconvenience occurs during doctors&#39; operation. As the lighting device is provided with the switch, doctors may readily turn on or off the light if necessary. Also, it is convenient for renewal and maintenance of the tube, as once the service life expires and the tube fails to work, the two countersunk bolts fixing the transparent lamp shade can be loosened and the transparent lamp shade can be removed. 
     The above contents are details of the present invention with reference to the preferred embodiments and shall not be construed as limitation to the embodiments of the present invention. Those skilled in the art may make simple derivations or replacement under the concept of the present invention, which shall be deemed as being within the scope of the present invention.