1. A drum comprising:
a cylindrical body having an opening, an outer circumference, and axial direction;
a head, which covers the opening of the body, the head including a rim and an outer circumference;
a cylindrical head frame, which is fitted to the outer circumference of the body, the head frame retaining the rim of the head and being movable along the axial direction of the body;
a hoop provided at the outer circumference of the head, the hoop abutting against the head frame to press the head frame along the axial direction of the body so that tension is applied to the head, the hoop including a plurality of mounting holes;
a plurality of fasteners located at the outer circumference of the body, each fastener being located opposite to the hoop with the head frame located in between, and each fastener including a nut;
a plurality of coupling bolts, which extend along the axial direction of the body, each coupling bolt including a head, with the head located opposite to the nut of one of the fasteners with the hoop located in between, and each coupling bolt being inserted in one of the mounting holes and threaded to said nut so that the hoop is coupled to the fastener; and
a plurality of loosening prevention structures, each loosening prevention structure being located between the head of one of the coupling bolts and the hoop, and including an annular elastic body through which said one of the coupling bolts is inserted and a deformation restricting member, which is discrete from the head of the one of the coupling bolts and is placed between a bottom surface of the head and the annular elastic body to restrict deformation of the elastic body along said axial direction, wherein each deformation restricting member includes an annular portion through which the one of the coupling bolts is inserted and a cylindrical portion extending from the annular portion towards the hoop, wherein the cylindrical portion has an inner surface positioned adjacently to an outer circumference of the elastic body, and wherein the cylindrical portion is shorter in said axial direction than the elastic body along said axial direction, such that when the elastic body is not compressed along said axial direction, a space is formed between an end of the cylindrical portion and the hoop, and as the coupling bolt is tightened relative to the nut, the elastic body is compressed a length corresponding to and up to a length of the space in said axial direction and the cylindrical portion abuts against the hoop and the head of the bolt.
2. The drum according to claim 1, wherein the elastic body and the cylindrical portion are respectively so sized and shaped that the elastic body abuts against the inner surface of the cylindrical portion when each coupling bolt is threaded to the respective said nut.
3. The drum according to claim 1, wherein the cylindrical portion includes an opening, a first end, and a second end which is the end toward the hoop,
and wherein each deformation restricting member further includes a ring, which decreases the opening of the cylindrical portion, and the ring is located at the first end of the cylindrical portion along said axial direction and includes a through hole through which said one of the coupling bolts is inserted.
4. The drum according to claim 1, wherein the elastic body is made of rubber.
5. The drum according to claim 4, wherein said one of the coupling bolts includes an outer diameter and the elastic body includes an inner diameter smaller than the outer diameter of the coupling bolt.
6. A drum comprising:
a cylindrical body having an opening, an outer circumference, and axial direction;
a head, which covers the opening of the body, the head including a rim and an outer circumference;
a cylindrical head frame, which is fitted to the outer circumference of the body, the head frame retaining the rim of the head and being movable along the axial direction of the body;
a hoop provided at the outer circumference of the head, the hoop abutting against the head frame to press the head frame along the axial direction of the body so that tension is applied to the head, the hoop including a plurality of mounting holes;
a plurality of fasteners located at the outer circumference of the body, each fastener being located opposite to the hoop with the head frame located in between, and each fastener including a nut;
a plurality of coupling bolts, which extend along the axial direction of the body, each coupling bolt including a head, with the head located opposite to the nut of one of the fasteners with the hoop located in between, and each coupling bolt being inserted in one of the mounting holes and threaded to said nut so that the hoop is coupled to the fastener; and
a plurality of loosening prevention structures, each loosening prevention structure being located between the head of one of the coupling bolts and the hoop, and including an annular elastic body through which said one of the coupling bolts is inserted and a deformation restricting member, which is discrete from the head of the one of the coupling bolts and is placed between a bottom surface of the head and the annular elastic body to restrict deformation of the elastic body along said axial direction, wherein each deformation restricting member includes an annular portion through which the one of the coupling bolts is inserted and a cylindrical portion extending from the annular portion towards the hoop, wherein the cylindrical portion has an inner surface positioned adjacently to an outer circumference of the elastic body, wherein the cylindrical portion is shorter in said axial direction than the elastic body along said axial direction, and wherein each deformation restricting member further includes a flat washer located at the hoop and abutting against the elastic body, the flat washer facing an end of the cylindrical portion along said axial direction, and said one of the coupling bolts being inserted through the flat washer, such that when the elastic body is not compressed along the axial direction, a space is formed between the cylindrical portion and the washer, and as the coupling bolt is tightened relative to the nut, the elastic body is compressed a length corresponding to and up to a length of the space in said axial direction and the cylindrical portion abuts against the washer and the head of the bolt.
7. The drum according to claim 6, wherein the flat washer is made of metal and the elastic body is made of rubber, and the flat washer is heat-sealed to the elastic body.
8. The drum according to claim 6, wherein the flat washer is made of resin and includes a plurality of ribs, which extend inward from the inner rim of the flat washer.
9. The drum according to claim 8, wherein said one of the coupling bolts includes an outer diameter, and an imaginary circle passing through the distal ends of the ribs has an inner diameter smaller than the outer diameter of the coupling bolt.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A position detection unit comprising:
an XY coordinate formation circuitry having a configuration in which a plurality of X-axis line bodies composed of line bodies and a plurality of Y-axis line bodies composed of line bodies are caused to intersect each other;
a drive signal input circuitry configured to input drive input signals to one end side of the plurality of Y-axis line bodies, the drive signal input circuitry being provided to one end side of the plurality of Y-axis line bodies; and
a position detection signal output circuitry configured to output a position detection signal corresponding to a designated coordinate position if a position designation tool has designated an XY coordinate position of the XY coordinate formation circuitry, the position detection signal output circuitry being provided to one end side of the plurality of X-axis line bodies; wherein
the plurality of Y-axis line bodies includes: a plurality of axis line bodies for position detection by an electromagnetic induction scheme, the axis line bodies having one end connected to the drive signal input circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies; and a plurality of axis line bodies for position detection by an electrostatic capacitance scheme, the axis line bodies having one end connected to the drive signal input circuitry and the other end formed mutually independently without being connected to the other end side of the other axis line bodies; and
the drive signal input circuitry comprises a Y-axis line body selection circuitry configured to:
select at least two Y-axis line bodies from the axis line bodies having one end connected to the drive signal input circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies among the plurality of Y-axis line bodies, and form an input loop coil; and
select an axis line body having one end connected to the drive signal input circuitry and the other end formed mutually independently without being connected to the other end side of the other axis line bodies among the plurality of Y-axis line bodies, and form a Y-axis electrode.
2. The position detection unit according to claim 1, wherein the Y-axis line body selection circuitry comprises:
a first selection circuitry configured to select at least one Y-axis line body to which the drive input signal is inputted from the axis line bodies having one end connected to the drive signal input circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies among the plurality of Y-axis line bodies; and
a second selection circuitry configured to select at least one Y-axis line body for forming an input loop coil together with the Y-axis line body selected by the first selection circuitry, from the axis line bodies excluding the Y-axis line body selected by the first selection circuitry.
3. The position detection unit according to claim 1, wherein the drive signal input circuitry forms an input loop coil different from the input loop coil by a combination of Y-axis line bodies different from the at least two Y-axis line bodies that form the input loop coil formed by the Y-axis line body selection circuitry.
4. The position detection unit according to claim 1, wherein
the plurality of X-axis line bodies includes:
a plurality of axis line bodies for position detection by an electromagnetic induction scheme, the axis line bodies having one end connected to the position detection signal output circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies; and
a plurality of axis line bodies for position detection by an electrostatic capacitance scheme, the axis line bodies having one end connected to the position detection signal output circuitry and the other end formed mutually independently without being connected to the other end side of the other axis line bodies, and
the position detection signal output circuitry comprises:
an X-axis line body selection circuitry configured to:
select at least two X-axis line bodies from the axis line bodies having one end connected to the position detection signal output circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies among the plurality of X-axis line bodies, and form an output loop coil; and
select an axis line body having one end connected to the position detection signal output circuitry and the other end formed mutually independently without being connected to the other end side of the other axis line bodies among the plurality of X-axis line bodies, and form an X-axis electrode.
5. The position detection unit according to claim 4, wherein the position detection unit transmits an input signal inputted from the input loop coil to the output loop coil via the position designation tool if the position designation tool has designated an XY coordinate position of the XY coordinate formation circuitry, and thereby outputs the position detection signal from the position detection signal output unit.
6. The position detection unit according to claim 1, wherein the drive signal input circuitry sequentially switches, in predetermined cycles, at least two Y-axis line bodies selected by the Y-axis line body selection circuitry in order to form the input loop coil.
7. The position detection unit according to claim 1, wherein the position detection unit comprises a designated-position detection control circuitry configured to send to the drive signal input circuitry a switching signal for selecting at least two Y-axis line bodies for forming the input loop coil.
8. The position detection unit according to claim 7, wherein the designated-position detection control circuitry generates the switching signal on the basis of a table in which at least two Y-axis line bodies selected in order to form the input loop coil are stored in advance.
9. The position detection unit according to claim 8, wherein the position detection unit has a plurality of tables having mutually different combinations of at least two Y-axis line bodies selected in order to form the input loop coil.
10. The position detection unit according to claim 4, wherein, in addition to position detection by an electromagnetic induction scheme in which an input signal inputted by the input loop coil is transmitted to an output loop coil via a position designation tool to thereby output the position detection signal, the position detection unit is capable of position detection by an electrostatic capacitance scheme for outputting the position detection signal on the basis of variation in a floating capacitance produced between the plurality of Y-axis line bodies and the plurality of X-axis line bodies.
11. (canceled)
12. A terminal device comprising:
a position detection unit including:
an XY coordinate formation circuitry having a configuration in which a plurality of X-axis line bodies composed of line bodies and a plurality of Y-axis line bodies composed of line bodies are caused to intersect each other;
a drive signal input circuitry configured to input drive input signals to one end side of the plurality of Y-axis line bodies, the drive signal input circuitry being provided to one end side of the plurality of Y-axis line bodies; and
a position detection signal output circuitry configured to output a position detection signal corresponding to a designated coordinate position if a position designation tool has designated an XY coordinate position of the XY coordinate formation circuitry, the position detection signal output circuitry being provided to one end side of the plurality of X-axis line bodies; wherein
the plurality of Y-axis line bodies includes: a plurality of axis line bodies for position detection by an electromagnetic induction scheme, the axis line bodies having one end connected to the drive signal input circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies; and a plurality of axis line bodies for position detection by an electrostatic capacitance scheme, the axis line bodies having one end connected to the drive signal input circuitry and the other end formed mutually independently without being connected to the other end side of the other axis line bodies; and
the drive signal input circuitry comprises a Y-axis line body selection circuitry configured to:
select at least two Y-axis line bodies from the axis line bodies having one end connected to the drive signal input circuitry and the other end connected in a mutual fashion to the other end side of the other axis line bodies among the plurality of Y-axis line bodies, and form an input loop coil; and
select an axis line body having one end connected to the drive signal input circuitry and the other end formed mutually independently without being connected to the other end side of the other axis line bodies among the plurality of Y-axis line bodies, and form a Y-axis electrode; and
processing circuitry configured to process information on the basis of a position detection signal outputted from the position detection unit.