1. An optical communication apparatus comprising:
a variable resistor unit that is arranged at a pre-stage of an electricaloptical conversion unit, which converts an electrical signal obtained by converting an input packet to an optical signal having a waveform corresponding to a potential difference between a positive phase component and a negative phase component of the electrical signal by using the potential difference, and that provides, to the positive phase component or the negative phase component, a resistor that varies a midpoint of potential of the positive phase component or the negative phase component to be input to the electricaloptical conversion unit;
a measurement unit that measures a ratio of a presence period, which is a period where the input packet is present, to a sum of the presence period and a non-presence period, which is a period other than the presence period; and
a control unit that controls a value of the resistor provided by the variable resistor unit based on the ratio measured by the measurement unit in such a manner that the midpoint of the potential of the positive phase component and the midpoint of the potential of the negative phase component, which would be apart in opposite directions in the non-presence period, get closer to each other.
2. The optical communication apparatus according to claim 1 further comprising
a comparison unit that compares the ratio measured this time and the ratio measured last time by the measurement unit, wherein
the control unit stops controlling the resistance value when the ratio measured this time and the ratio measured last time by the measurement unit match as a result of the comparison by the comparison unit.
3. The optical communication apparatus according to claim 1 further comprising:
a holding unit that temporarily holds the electrical signal obtained by converting the input packet; and
a generation unit that reads the electrical signal held in the holding unit, generates the positive phase component and the negative phase component from the read electrical signal, and outputs the generated positive phase component and negative phase component to the electricaloptical conversion unit, wherein
the control unit reports, after completing the control of the resistance value, a signal for permitting the generation unit to read the electrical signal to the holding unit.
4. A control method of an optical communication apparatus, the method comprising:
measuring a ratio of a presence period, which is a period where an input packet is present, to a sum of the presence period and a non-presence period, which is a period other than the presence period; and
controlling a resistance value of a variable resistor unit that is arranged at a pre-stage of an electricaloptical conversion unit, which converts the electrical signal to an optical signal having a waveform corresponding to a potential difference between a positive phase component and a negative phase component of an electrical signal obtained by converting the input packet by using the potential difference, and that provides, to the positive phase component or the negative phase component, a resistor that varies a midpoint of potential of the positive phase component or the negative phase component to be input to the electricaloptical conversion unit based on the measured ratio in such a manner that the midpoint of the potential of the positive phase component and the midpoint of the potential of the negative phase component, which would be apart in opposite directions in the non-presence period, get closer to each other.
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. An alignment arrangement for adjusting alignment of a vehicle wheel, the alignment arrangement supporting on a vehicle body or frame member inboard ends of a control arm that has at an outboard end thereof an axle on which the vehicle wheel is mounted, the alignment arrangement comprising:
a) couplings at the inboard ends of the control arm, each coupling consisting essentially of:
a bushing through the inboard end of the control arm, the bushing having an axial opening therethrough which receives a mounting bolt having a shank with a head at a first end and a nut at a second end;
first and second walls fixed with respect to the body or frame member, the first and second walls having first and second lateral slots, respectively, therein, the first and second slots being of a selected width, for receiving the shank of the mounting bolt therethrough with the head facing the first slot and nut facing the second slot, bearing surfaces around the shank for bearing against the first and second walls when the nut is tightened on the shank;
reaction surfaces on one of the walls, the reaction surfaces disposed adjacent to one of the slots, and
b) a tool separate from the inboard end of the control arm, the tool comprising:
a cam portion for engagement with the reaction surfaces on one of the walls when the tool is in operative cooperation with the control arm by being mounted on the head of the mounting bolt or the nut thereon, the cam portion of the tool having a fixed axis of rotation with respect to the bolt when engaging the reaction surfaces for shifting the bolt in the lateral slots in the walls upon rotating the tool to push against one of the reaction surfaces.
2. The alignment arrangement of claim 1 wherein the head of the bolt or nut is polygonal and the cam portion of the tool has a polygonal opening therethrough complementing the head or nut, wherein when the polygonal opening of the tool is placed over and around the head or nut, the axis of rotation of the bolt becomes the axis of rotation of the tool.
3. The alignment arrangement of claim 1 wherein the reaction surfaces comprise a pair of opposed surfaces facing one another and extending from one of the walls, the cam portion of the tool being positioned between the walls when the tool is engaged with the inboard end of the control arm, wherein when the tool is rotated in a first direction the mounting bolt and control arm move away from the vehicle body or frame member to adjust alignment of the wheel, and when the tool is rotated in a second direction the mounting bolt and control arm move toward the vehicle body or frame member to adjust alignment of the wheel.
4. The alignment arrangement of claim 3 wherein the cam portion of the tool has a socket portion therein for cooperation with a driving lug on a wrench handle or power tool.
5. The alignment arrangement of claim 3 wherein the tool comprises a gear with a first socket portion complementing the head of the mounting bolt and wherein the cam comprises a pair of cooperating racks disposed between the opposed surfaces of the reaction component, each cam having a row of teeth and an oppositely facing cam surface facing one of the opposed surfaces, the gear further having a socket portion for receiving a driving lug of a torque applying tool.
6. The alignment arrangement of claim 1 wherein the reaction surfaces are oppositely facing surfaces on a projection and wherein the cam portion of the tool is a curved slot in a rotational body, which curved slot receives the projection.
7. The alignment arrangement of claim 1 wherein the bearing surfaces are on washers disposed between the head of the bolt and one of the walls and between nut and the other wall.
8. The alignment arrangement of claim 9 wherein the bearing surfaces are radially extending surfaces on at least the head or the nut.
9. The alignment arrangement of claim 1 wherein the shank portion of the bolt is smooth where the bolt passes through the bushing and is threaded beyond the bushing to receive the nut.
10. The alignment arrangement of claim 1 wherein the control arm is a bottom control arm of a suspension having a bottom control arm and a top control arm.
11. The alignment arrangement of claim 1 wherein the control arm is a top control arm of a suspension having a bottom control arm and a top control arm.
12. An alignment arrangement for adjusting alignment of a pair of steerable vehicle wheels, the alignment arrangement being part of a suspension system supporting on a vehicle body or frame member two inboard ends of two control arms that have at outboard ends thereof axles on which the vehicle wheels are mounted, the alignment arrangement comprising:
a) couplings at the two inboard ends of the control arms, each coupling consisting essentially of:
a bushing through the inboard end of the control arm, the bushing having an axial opening therethrough which receives a mounting bolt having a shank with a head at a first end and a nut at a second end;
first and second walls on brackets fixed with respect to the body or frame member, the first and second walls having first and second lateral slots, respectively, therein; the first and second slots being of a selected width for receiving the shank of the mounting bolt therethrough with the head facing the first slot and nut facing the second slot, bearing surfaces around the shank for bearing against the first and second walls when the nut is tightened on the shank,
reaction surfaces on one of the walls, the reaction surfaces dispose adjacent to one of the slots, and
b) a pair of tools separate from the inboard ends of the control arms, the tools comprising:
cam portions for engagement with the reaction surfaces on the walls of the couplings when the tools are in operative cooperation with the control arms by being mounted on the heads of the mounting bolts or the nuts thereon, the cam portions of the tools having fixed axes of rotation with respect to the bolts when engaging the reaction surfaces for shifting the bolts in the lateral slots in the walls upon rotating the tools to push against the reaction surfaces.
13. The alignment arrangement of claim 12 wherein the bearing surfaces are on washers disposed between the heads of the bolts and one of the walls and between the nuts and the other walls.
14. The alignment arrangement of claim 12 wherein the bearing surfaces are radially extending surfaces on at least one of the heads and nuts.
15. The alignment arrangement of claim 12 wherein the shank portions of the bolts are smooth where the bolts pass through the bushings and are threaded beyond the bushings to receive the nuts.
15. The alignment arrangement of claim 12 wherein the control arms are bottom control arms of a suspension having bottom control arms and top control arms.
16. The alignment arrangement of claim 12 wherein the control arms are top control arms of a suspension having bottom control arms and top control arms.
17. The alignment arrangement of claim 12 wherein the first reaction surface is the edge of a notch through one of the walls.
18. The alignment arrangement of claim 12 wherein the brackets each have flanges thereon, one of which flanges is welded to the top of the frame rail the other of which flanges is welded to the side of the frame rail and has a surface thereon which provides one of the reaction surfaces engageable by a cam surface of one of the tools.
19. The alignment arrangement of claim 12 wherein the suspension system is a front wheel suspension system.
20. The alignment arrangement of claim 12 wherein the suspension system is a rear wheel suspension system.