Flexure with elongated openings
View Patent ↗A flexure for tilting having a neck which lies between a pair of cylindrical openings, each of which has a cross-sectional shape which is curved and elongated. A gimbal capable of tilting around mutually perpendicular axes which incorporates the flexure.
1. A flexure for tiltably mounting an object to a support surface, comprising:
a block of elastic material having mounting surfaces at opposing longitudinal ends thereof which extend transverse to a longitudinal axis of the block, the block having first and second cylindrical openings therein with a neck therebetween, each of said openings having a length dimension extending completely through said block in an axial direction transverse to the longitudinal axis,
first and second slits in the block, each extending along a sidewall surface of said block and to a respective one of said openings and extending completely through said block in an axial direction transverse to the longitudinal axis, wherein said first slit at an end forms an entrance to said first cylindrical opening and said second slit at an end forms an entrance to said second cylindrical opening, said neck having a shortest dimension extending directly between said openings at the narrowest region of the neck and a long dimension which is transverse to the shortest dimension, each of said first and second cylindrical openings having a cross-sectional shape transverse to said axial direction which is elliptical with an eccentricity of greater than 0.69 and less than 0.96 and which is elongated in a direction which is parallel to said long dimension of the neck, wherein when said mounting surfaces are displaced relative to each other, tilting can occur around said neck while voids formed by the slits are utilized for accommodating the tilting movement.
2. The flexure of claim 1 wherein said first and second cylindrical openings are of the same size.
3. The flexure of 1 wherein said entrances to said first and second cylindrical openings are directly opposite said neck.
4. The flexure of claim 1 , wherein said block of elastic material has an annular cross-section shape and wherein said axial direction is a radial direction of the annular shape, further including third and fourth cylindrical openings in the block extending completely through the block in a radial direction having a second neck therebetween, there being third and fourth slits in the block, each extending along a sidewall surface of said block and to a respective one of said third and fourth openings and extending completely through said block, said third slit at a slit end forming an entrance to said third cylindrical opening, said fourth slit at a slit end forming an entrance to said fourth cylindrical opening, said second neck having a shortest dimension extending directly between said third and fourth cylindrical openings at the narrowest region of the second neck and a long dimension which is transverse to said shortest dimension, each of said third and fourth cylindrical openings having a cross-sectional shape in a plane transverse to said radial direction which is elliptical with an eccentricity of greater than 0.69 and less than 0.96 and which is elongated in a direction which is parallel to the long dimension of the second neck.
5. The flexure of claim 1 in combination with means for applying a force to a surface of the flexure for causing it to tilt.