1. A golf club head comprising
a face plate and
a head main body to which the face plate is attached so as to form a hollow behind the face plate,
the face plate comprising a main portion and a flange, the main portion having a front surface, rear surface and circumferential surface, and provided on the corner of the front surface and circumferential surface with a cut-off portion, the flange protruding from the rear surface and extending along the peripheral edge of the main portion,
the head main body provided at the front with an opening into which the face plate is fit, wherein
a securing groove into which the flange is fit is provided in the opening, the securing groove is defined between an inner wall and an outer wall, and the outer wall extends to said front surface and provided at the front end thereof with a hook portion protruding into said cut-off portion.
2. The golf club head according to claim 1, wherein
said inner wall extends toward the face plate but terminates before the rear surface.
3. The golf club head according to claim 1, wherein
said inner wall extends toward the face plate so that the front end thereof reaches to the rear surface.
4. The golf club head according to claim 3, wherein
said front end has an inside corner cut off to reduce the contact area with the rear surface.
5. The golf club head according to claim 1, wherein
said flange and securing groove are provided continuously along the peripheral edge of the face plate.
6. The golf club head according to claim 1, wherein
the cut-off portion and hook portion are provided continuously along the peripheral edge of the face plate.
7. The golf club head according to claim 1, wherein
the outer wall has a thickness (W1) in a range of not more than 4.0 mm.
8. The golf club head according to claim 1, wherein
the flange has a thickness (P1) in a range of not more than 4.0 mm.
9. The golf club head according to claim 1, wherein
the contact length (Lc) of the inner wall with the flange is more than 1.0 mm.
10. The golf club head according to claim 1, wherein
the hook portion is formed by plastic deformation.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A resonator, comprising:
a plurality of line patterns on a substrate, each of which is an aggregate of a plurality of lines, in each of which first ends and second ends of at least a portion of said plurality of lines are each disposed substantially at inner and outer periphery portions of said aggregate around a predetermined point of said substrate, respectively, and which are disposed on a substrate so as not to intersect each other, and mutually insulated from each other;
each line of at least one of said plurality of line patterns having a spiral shape; and
each line of at least one of the other line pattern s having a pattern different from said spiral shape.
2. A resonator in accordance with claim 1, wherein at least one of said plurality of line patterns has a radial shape.
3. A resonator which resonates in a resonant mode of an integral multiple of a half-wavelength, said resonator comprising:
a line pattern on a substrate, which is an aggregate of a plurality of lines each having a spiral shape, in which first ends and second ends of at least a portion of said plurality of lines are each disposed substantially at inner and outer periphery portions of said aggregate around a predetermined point of said substrate, respectively, in which each of the inner and outer periphery portions of said lines are open-circuited, and said lines are disposed on said substrate so as not to intersect each other; and
another line pattern which adds an electrostatic capacitance, utilizing a potential difference or a portion of said potential difference between a voltage node and a voltage antinode in a resonant mode, said other line pattern being disposed on a substrate so as to be insulated from said line pattern.
4. A resonator in accordance with claim 3, wherein at least one of said plurality of line patterns has a radial shape.
5. A resonator in accordance with claim 1 or 3, wherein:
each of at least two of said plurality of line patterns is an aggregate of a plurality of spiral lines, and the spiral directions thereof is opposite to each other.
6. A resonator in accordance with claim 1 or claim 3, wherein, in at least one of said plurality of line patterns, portions which exhibit substantial equipotentialities in a resonant state are conductively connected.
7. A resonator in accordance with any claim 1 or claim 3, wherein at least one of said plurality of line patterns is formed of a superconducting line.
8. A resonator in accordance with claim 1 or claim 3, wherein the width of each of said plurality of line patterns is set to be substantially equal to the skin depth of the line conductor or narrower than the skin depth thereof, at an operating frequency.
9. A filter including signal inputoutput portions coupled with a resonator in accordance with claim 1 or claim 3.
10. A communication device including a high-frequency circuit, and connected thereto a filter in accordance with claim 9.
11. A duplexer including a transmitting filter and a receiving filter, at least one of said transmitting and receiving filters being a filter in accordance with claim 9.
12. A communication device including a high-frequency circuit, and connected thereto a duplexer in accordance with claim 11.