Imaging device and optical device

Abstract

An imaging device comprising a light transmissive member 18 having light transmissive character, a vibration member 20 causing bending vibration for the light transmissive member, a driving portion 56 for driving the vibration member 20 , wherein the driving portion 56 causes bending vibration of the light transmissive member 18 at a first frequency along with a first direction and causes bending vibration of the light transmissive member 18 at a second frequency along with a second direction which is different from said first frequency.

1 . An imaging device comprising:
 a laminated member arranged to face an image pick-up portion that is configured to obtain an image from an optical system, the laminated member including a plurality of light transmissive layers that are laminated each other and are capable of transmitting light;   a vibration member provided on the laminated member to vibrate the laminated member to cause bending vibration in said laminated member;   a driving portion electrically connected to said vibration member so as to drive said vibration member; and   at least one light transmissive layer among the light transmissive layers being larger than other light transmissive layers among the light transmissive layers, the at least one light transmissive layer having a laminated part which is laminated by the other light transmissive layers and a non-laminated part which is not laminated by the other light transmissive layers, said vibration member being mounted on the non-laminated part.   
     
     
         2 . The imaging device as set forth in  claim 1 , wherein
 said laminated member has a rectangular shape having a pair of long sides and a pair of short sides.   
     
     
         3 . An imaging device comprising:
 a laminated member arranged to face an image pick-up portion that is configured to obtain an image from an optical system, the laminated member including a plurality of light transmissive layers that are laminated each other and are capable of transmitting light;   a vibration member provided on the laminated member to vibrate the laminated member to cause bending vibration in said laminated member;   a driving portion electrically connected to said vibration member so as to drive said vibration member; and   at least one light transmissive layer among the light transmissive layers being larger than other light transmissive layers among the light transmissive layers, the at least one light transmissive layer having a laminated part which is laminated by the other light transmissive layers and a non-laminated part which is not laminated by the other light transmissive layers, wherein said laminated member has a rectangular shape having a pair of long sides and a pair of short sides,   said non-laminated part is provided at each of both ends of the pair of long sides, and   said vibration member being mounted on the non-laminated part.   
     
     
         4 . The imaging device as set forth in  claim 1 , wherein
 said laminated member is an optical low-pass filter.   
     
     
         5 . The imaging device as set forth in  claim 1 , further comprising:
 a case on which said laminated member is arranged; and   a sealing member which is elastic and is arranged between said laminated member and said case.   
     
     
         6 . The imaging device as set forth in  claim 5 , further comprising:
 a pressing member which presses said laminated member toward said sealing member and is arranged at a portion nearer to an edge of said laminated member than said vibration member.   
     
     
         7 . The imaging device as set forth in  claim 1 , wherein
 said driving portion drives said vibration member and causes bending of said laminated member at a first frequency along a first direction, and bending of said laminated member at a second frequency, which is different from said first frequency, along a second direction which crosses said first direction.   
     
     
         8 . The imaging device as set forth in  claim 7 , wherein
 said driving portion operates the bending vibration of said first frequency and the bending vibration of said second frequency at a different timing.   
     
     
         9 . The imaging device as set forth in  claim 1 , wherein
 said driving portion switches an odd vibration mode which causes bending vibration of said laminated member at a bending mode whose number of vibration nodes becomes odd number and an even vibration mode which causes bending vibration of said laminated member at a bending mode whose number of vibration nodes becomes even number,   said odd vibration mode is a bending mode along a first direction, and   said even vibration mode is a bending mode along a second direction which is different from the first direction.   
     
     
         10 . The imaging device as set forth in  claim 9 , wherein
 said vibration member is driven so as to occur vibration nodes which are parallel to said second direction at said laminated member in said odd vibration mode, and   said vibration member is driven so as to occur vibration nodes which are parallel to said first direction at said laminated member in said even vibration mode.   
     
     
         11 . The imaging device as set forth in  claim 9 , wherein
 said vibration member comprises a first vibration portion and a second vibration portion which are spaced each other and provided on said laminated member.   
     
     
         12 . The imaging device as set forth in  claim 11 , wherein
 said driving portion provides a first driving signal to said first vibration portion, and provides a second driving signal to said second vibration portion, during one of said even vibration mode and said odd vibration mode,   said first driving signal and said second driving signal are signals in the same phase, during another of said even vibration mode and said odd vibration mode, and   said first driving signal and said second driving signal are signals in the reverse phase.   
     
     
         13 . The imaging device as set forth in  claim 12 , wherein
 said first vibration portion and said second vibration portion are equipped on said laminated member so as to be the same piezoelectric properties in a direction opposed to each other, during said odd vibration mode,   said driving portion provides said first driving signal and said second driving signal which are signals in the same phase to said first vibration portion and said second vibration portion, during said even vibration mode, and   said driving portion provides said first driving signal and said second driving signal which are signals in the reverse phase to said first vibration portion and said second vibration portion.   
     
     
         14 . The imaging device as set forth in  claim 11 , wherein
 said vibration portions are provided at symmetry site on a face of said laminated member substantially vertical to an optical axis of said optical system.   
     
     
         15 . An optical device comprising the imaging device as set forth in  claim 1 . 
     
     
         16 . The imaging device as set forth in  claim 1 , wherein
 said vibration member and said other light transmissive layers are provided on the same side with the surface of the at least one light transmissive layer.   
     
     
         17 . The imaging device as set forth in  claim 1 , wherein
 said non-laminated part on which said vibration member is mounted is a single plate of crystal plate or glass plate, and   a plurality of optical plates which are composed of an optical low-pass filter are provided on the laminated part.   
     
     
         18 . The imaging device as set forth in  claim 17  further comprising;
 a case on which said laminated member is arranged, 
 a sealing member which has elastic and is arranged between said laminated member and said case, wherein 
 said single plate of crystal plate or glass plate is sandwiched between said vibration member and said sealing member.