Ultrasonic cutting element and ultrasonic treatment tool
AssigneeFUJIFILM Corporation
InventorTakayuki Naono
Life of this patent
Estimating the term…
Abstract
Provided is an ultrasonic cutting element including a blade arm having a primary vibration plate and a blade portion fixed to one end of the primary vibration plate, a counter mass arm including one or more secondary vibration plates, a holding member to which vibration ends of the blade arm and the counter mass arm are respectively connected and which holds the blade arm and the counter mass arm in parallel, and a driving portion being a piezoelectric actuator that imparts ultrasonic vibrations to at least one of the primary vibration plate or the secondary vibration plate, in which the blade arm and the counter mass arm respectively bending-vibrate in a primary surface direction in a resonant mode in which the arms vibrate in mutually opposite phases as flexural vibrators.
Claims9
An ultrasonic cutting element comprising:
- a blade arm having a primary vibration plate and a blade portion fixed to one end of the primary vibration plate;
- a counter mass arm including one or more secondary vibration plates;
- a holding member to which a vibration end of the primary vibration plate and a vibration end of the secondary vibration plate are respectively connected and which holds the blade arm and the counter mass arm in parallel;
- and
- a driving portion that imparts ultrasonic vibrations to at least one of the primary vibration plate or the secondary vibration plate,
- wherein the driving portion is a piezoelectric actuator having a lower portion electrode, a piezoelectric film, and an upper portion electrode laminated in this order from a primary surface side on at least one of a primary surface of the primary vibration plate or a primary surface of the secondary vibration plate, and
- the blade arm and the counter mass arm respectively bending-vibrate in a primary surface direction in a resonant mode in which the arms vibrate in mutually opposite phases as flexural vibrators,
- wherein, in a case in which an axis extending toward a distal end of the blade portion from the vibration end of the primary vibration plate is considered as an x axis, a location of the vibration end is at x=0, a material density, a width, and a thickness of the blade arm are represented by ρb, wb(x), and tb(x) respectively, and a material density, a width, and a thickness of the counter mass arm are represented by ρcm, wcm(x), and tcm(x) respectively,
- I
- b
- =
- ∫
- 0
- Lb
-
- ρ
- b
- ·
- w
- b
-
- (
- x
- )
- ·
- t
- b
-
- (
- x
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- ·
- u
-
- (
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- ·
- dx
- I
- c
-
-
- m
- =
- ∫
- 0
- Lcm
-
- ρ
- c
-
-
- m
- ·
- w
- c
-
-
- m
-
- (
- x
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- ·
- t
- c
-
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- m
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- dx
- u
-
- (
- x
- )
- =
- x
- L
- b
-
- I
- ratio
- =
- I
- b
- I
- c
-
-
- m
-
- (
- I
- b
- ≤
- I
- c
-
-
- m
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- ,
- I
- c
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-
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- I
- b
-
- (
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- c
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- <
- I
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- the blade arm and the counter mass arm satisfy Iratio≥0.14.
Dependencies are inferred from the claim text.