1. In combination in a monolithic integrated circuit chip,
a plurality of repetitive cells each having a first branch responsive to a digital input voltage and having a second branch responsive to an individual one of progressive fractions of a reference voltage to provide an output signal representative of any difference between the input voltage and the individual one of the progressive fractions of the reference voltage,
an impedance network comprising a first set of impedance elements each connected to the first branches of first individual pairs of successive ones of the repetitive cells and a second set of impedance elements each connected to the second branches of second individual pairs of the successive ones of the repetitive cells,
the first set of the impedance elements defining a first impedance strip on the chip and the second set of the impedance elements defining a second impedance strip on the chip, and
each of the impedance elements in the first set being connected to repetitive cells which are responsive to progressive fractions of the reference voltage, such progressive fractions representing voltage differences between the successive cells connected to such impedance elements greater than the voltage difference between successive ones of the progressive fractions of the reference voltage,
each of the impedance elements in the second set being connected to repetitive cells which are responsive to the progressive fractions of the reference voltage, such progressive fractions representing voltage differences between the successive cells connected to such impedance element greater than the voltage difference between successive ones of the progressive fractions of the reference voltage.
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 golf club head comprising:
a face portion,
a sole portion, and
a crown portion,
wherein the face portion has a central region, a toe region arranged on a toe side with respect to the central region in a toe-heel direction, and a heel region arranged on a heel side with respect to the central region in the toe-heel direction,
the central region is formed with a higher thickness than the toe region and the heel region, and
the toe region and the heel region have a plurality of reduced-thickness portions that are arranged at intervals in the toe-heel direction and extend from the sole portion side to the crown portion side.
2. The golf club head according to claim 1, wherein the plurality of reduced-thickness portions are formed so as to be band-like.
3. The golf club head according to claim 2, wherein the width of the reduced-thickness portions in the toe-heel direction is in a range of 1.0 to 10.0 mm.
4. The golf club head according to claim 1, wherein a difference in thickness between the reduced-thickness portions and a region other than the reduced-thickness portions in the toe region and the heel region is in a range of 0.1 to 0.5 mm.
5. The golf club head according to claim 1, wherein a transitional region whose thickness progressively decreases with increasing distance from the central region is formed between the central region and the toe region and between the central region and the heel region.
6. The golf club head according to claim 1, further comprising a golf club head body that has the crown portion, the sole portion, and the side portion, and also has an opening surrounded by the crown portion, the sole portion, and the side portion,
wherein the face portion is formed so as to be cup-shaped having an impact portion for hitting a ball and a peripheral portion that extends away from a periphery of the impact portion, and is arranged so as to block the opening of the golf club head body.
7. The golf club head according to claim 1,
wherein in the peripheral portion of the impact portion of the face portion, the thickness of a region adjacent to the toe region is lower than the thickness of the toe region, and
in an interior peripheral portion of the face portion, the thickness of a region adjacent to the heel region is lower than the thickness of the heel region.
8. The golf club head according to claim 1, wherein the thickness of the central region is 3.0 to 4.2 mm.
9. The golf club head according to claim 1, wherein the surface area of the central region is 3 to 20 cm2.
10. The golf club head according to claim 1, wherein the periphery of the transitional region with the lowest thickness is in contact with the toe region or the heel region.
11. The golf club head according to claim 1, wherein a toe-side peripheral region is formed in the peripheral portion of the toe region, and the upper end and the lower end of each reduced-thickness portion in the toe region extend to positions adjacent to the toe-side peripheral region.
12. The golf club head according to claim 1, wherein the thickness of each reduced-thickness portion is 1.6 to 2.6 mm.
13. The golf club head according to claim 1, wherein thickness portions are formed between adjacent reduced-thickness portions, and the thickness of each thick portion is 1.8 to 2.8 mm.
14. The golf club head according to claim 1, wherein the width of each reduced-thickness portion in the toe-heel direction is 1.0 to 10.0 mm.
15. The golf club head according to claim 1, wherein thickness portions are formed between adjacent reduced-thickness portions, and the width of each thick portion in the toe-heel direction is 0.5 to 7.0 mm.
16. The golf club head according to claim 1, wherein a heal-side peripheral region is formed in the peripheral portion of the heal region, and the upper end and the lower end of each reduced-thickness portion in the heal region extend to positions adjacent to the heal-side peripheral region.
17. The golf club head according to claim 1, wherein the thicknesses and the widths in the toe-heal direction of each reduced-thickness portion in the toe region are the same as those of each reduced-thickness portion in the heal region.
18. The golf club head according to claim 1, wherein a toe-side peripheral region is formed in the peripheral portion of the toe region, a heal-side peripheral region is formed in the peripheral portion of the heal region, and the thickness of the heal-side peripheral region is greater than that of the toe-side peripheral region.