Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
1998-05-27
2001-01-30
Buczinski, Stephen C. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C318S466000, C324S174000, C324S179000, C356S141100, C356S028000, C388S923000
Reexamination Certificate
active
06181410
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotation angle controlling motor, and particularly to an oscillating motor in which positional adjustment of the origin of a main shaft can be easily made after the assembly of the motor.
The present invention relates to a measurement device for measuring a distance, a moving speed, or a moving direction by using a laser light, and particularly to a device for measuring a distance, a moving speed, or a moving direction in which the direction of an irradiated laser light and the range of scanning can be easily set, a load to an arithmetic CPU for performing calculation after receiving light is small, and measurement accuracy is high. The present invention also relates to a vehicle having the measurement device.
2. Description of the Related Art
First, a conventional rotation angle controlling motor will be described with reference to an oscillating motor as an example.
FIG. 3
is a schematic structural view showing the inside of a conventional oscillating motor. An oscillating motor
10
is such a motor that a rotation angle of a main shaft
1
can be arbitrarily controlled. Two-pole magnets
7
a
and
7
b
are cylindrically fixed to the main shaft
1
in the radial direction. Coil substrates
3
a
and
3
b
are disposed around the outer circumferences of the magnets
7
a
and
7
b
with an interval of a predetermined distance. Driving coils
5
a
and
5
b
are uniformly wound around the coil substrates
3
a
and
3
b
(the driving coil
5
b
is not shown). Rotation angle detecting magnets
11
a
and
11
b
for detecting a rotation angle of the main shaft
1
are disposed at the lower portions of the magnets
7
a
and
7
b.
A position detecting sensor
9
is disposed at the outer circumference of the rotation angle detecting magnets
11
a
and
11
b
with an interval of a predetermined distance.
An operation of this motor will next be described. In
FIG. 3
, when an electric current is made to flow through the driving coils
5
a
and
5
b,
a torque is generated between these driving coils and the magnets
7
a
and
7
b.
If an electric current is fixed to a predetermined value, the main shaft
1
stops. If the driving coils
5
a
and
5
b
are connected to each other in series and an alternating current is made to flow, it is possible to make the main shaft carry out an oscillating motion within a range of less than 180 degrees.
When the main shaft
1
is oscillated, an output in proportion to the magnetic flux density shown in
FIG. 4
can be obtained from the position detecting sensor
9
. Thus, if an electric current flown in the driving coil
5
is adjusted so that the output signal from the position detecting sensor
9
is made a predetermined value, it is possible to control the main shaft
1
so as to stop the shaft at a desired position. Further, if a signal from a not-shown oscillator is made an alternating current signal and is inputted into the driving coil
5
, it is also possible to control the main shaft so that the main shaft is simply reciprocated within a range of an angle.
In the conventional oscillating motor
10
, the position detecting sensor
9
and the rotation angle detecting magnets
11
a
and
11
b
are disposed in the inside of a not-shown motor case
15
. Thus, the positional adjustment of the origin of the main shaft
1
must be carried out at the time of assembling the oscillating motor
10
. This positional adjustment of the origin is carried out such that a reference current is made to flow through the driving coil
5
in the state where the oscillating motor
10
is temporarily assembled, and a deviation of the main shaft
1
from the origin is compensated by, for example, moving the driving coil
5
. Thus, the adjustment requires an operation time, and there is a fear that the adjusted position is slightly deviated after the completion of assembly. Besides, there is a fear that the position of a not-shown screw hole for attachment of the motor is deviated from the designed position;, or cable releasing positions of the driving coil
5
and the position detecting sensor
9
are deviated from the designed positions.
A conventional device of measuring a distance by using a laser light will next be described.
There is conventionally a device of measuring a distance between a moving car and the car ahead by using a laser light. This conventional device adopts the following system.
System
1
(not shown):
A laser light source radiates a laser light to a reflector attached to a rear portion of the car ahead, and a light receiving portion receives the reflected light. Here, the reflector is normally disposed at the rear portion of a car or a bicycle to diffusely reflect the light from the headlights of a backward car. Based on the irradiated light and the reflected light, the distance between an objective car and the car ahead is calculated by the operation of a time difference therebetween, a phase difference therebetween, a Doppler effect, a frequency correlation, and the like.
System
2
:
As shown in
FIG. 6
, a link mechanism
33
is attached to a driving portion
32
such as a DC motor or a stepping motor to oscillate a reflecting mirror
17
. By this, a laser light is made to perform scanning within a range of a predetermined angle, and the distance between an objective car and the car ahead is calculated by operations.
System
3
:
As shown in
FIG. 7
, a polygon mirror
35
is connectively fixed to a main shaft
34
of a driving portion
32
. Then, the main shaft
34
is made to rotate in one direction. A plurality of mirror surfaces
36
are disposed on the outer circumference of the polygon mirror
35
. When the mirror surface
36
is rotated, the laser light is made to perform scanning in a range of a predetermined angle.
However, in the above described system
1
, since the directivity of a laser light is high, there is a fear that if the car ahead moves either right or left, the detection can not be made. In the system
2
, there is a fear that the accuracy of an oscillating angle becomes inferior due to the backlash of the link mechanism
33
. Besides, there are defects that since the link mechanism
33
is disposed in addition to the driving portion
32
, the volume of the device becomes large, and the device becomes expensive by the cost of the link mechanism
33
. In the system
3
, sine the polygon mirror is constituted by the plurality of mirror surfaces
36
, accuracy between mirror surfaces is required. Further, since the positions of the mirror surfaces
36
are away from the center of the main shaft
34
, the position where the laser light is reflected at the mirror surface
36
is moved together with the rotation of the mirror surface
36
. Thus, there is a defect that it is necessary to correct the reflected light, and a great deal of calculation is required for the correction, so that a load to an arithmetic CPU is large. Further, there is also a defect that since an arrangement angle of the mirror surface
36
viewed from the center of the main shaft
34
is determined at a constant value, a range of scanning can not be changed.
SUMMARY OF THE INVENTION
The present invention has been made to solve the problems of the prior art described above, and a first object of the present invention is to provide a rotation angle controlling motor in which positional adjustment of the origin of a main shaft can be easily made after the assembly of the motor.
A second object of the present invention is to provide a measurement device of measuring a distance, a moving speed, or a moving direction by using a laser light in which the direction of radiating a laser light and the range of scanning can be easily set, a load to an arithmetic CPU after receiving light can be made small, and the accuracy of measurement is high.
A third object of the present invention is to provide a vehicle having a measurement device according to the present invention.
In order to achieve the above objects, according to a first aspect of the present invention, in a rotation
Ishida Takashi
Ohki Shigeru
Adams & Wilks
Buczinski Stephen C.
Seiko Instruments Inc.
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