Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2001-03-27
2003-02-04
Schuberg, Darren (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S689000, C349S058000
Reexamination Certificate
active
06515853
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a position adjusting mechanism applicable as a mounting construction for a display device, for example, in a head mount display device, and a mounting device using the position adjusting mechanism.
BACKGROUND OF THE INVENTION
A head mount display device has so far been used widely because an image can be seen easily with a wide screen, stereoscopic vision is easy, and the device can be moved together with an observer. Generally, such a head mount display device has a position adjusting mechanism for adjusting the position of display portion after the device is mounted.
FIG. 19
shows an example of a conventional head mount display device having a position adjusting mechanism. In
FIG. 19
, a display
100
, which is the display portion, is attached to the distal end of a connecting member
112
extending from a front frame
110
constituting a head mount mechanism of the head mount display device via a support shaft
110
a
serving as a position adjusting mechanism. The support shaft
110
a
is attached so as to be rotatable against a predetermined frictional force (higher than the gravity of the display
100
) with respect to the connecting member
112
, and the display
100
fixed to the support shaft
110
a
is fixed to an arbitrary rotational position.
The head mount display device shown in
FIG. 19
includes the front frame
110
which holds the display
100
as a mounting mechanism and is opposed to the front head of a wearer when the device is mounted, two side frames
101
which are attached at both ends, right and left, of the front frame
110
so as to be rotatable in the horizontal direction in a range of a predetermined angle and are opposed to the side heads of the wearer when the device is mounted, a flexible band
103
each end of which is attached to the side frame
101
so that the length thereof is adjustable, and a top frame
105
which connects the right and left side frames
101
to each other via flexible bands
106
attached so that the length thereof is adjustable and is opposed to the head top of the wearer when the device is mounted.
Also, a front pad
107
for pressing the front head of the wearer is provided on the inside in the center of the front frame
110
, and a rear pad
104
for pressing the rear head of the wearer is provided on the inside in the center of the band
103
.
Such a conventional head mount display device is mounted on a wearer as described below. First, knobs
102
provided on the right and left side frames
101
are moved in the direction indicated by the arrow A to adjust the length of the band
103
, by which pressing forces against the front head and the rear head applied by the rear pad
104
and the front pad
107
of the head mount mechanism are adjusted. Next, knobs
108
provided on the top frame
105
is moved in the direction indicated by the arrow B to adjust the lengths of the bands
106
, by which the top frame
105
is caused to abut on the head top of the wearer.
By the above-described operation, the front pad
107
provided on the front frame
110
and the rear pad
104
provided on the band
103
are pressed against the front head and the rear head of the wearer, respectively, by a fixed force, and the top frame
105
abuts on the top head, by which the display
100
connected to the front frame
110
is mounted on the head of the wearer.
Next, the wearer adjusts the optimum observation position by tilting the display
100
supported in front of eyes around the support shaft
110
a.
A problem with the conventional position adjusting mechanism consisting of a combination of the support shaft
110
a
and the connecting member
112
is that a range in which the display
100
is movable is limited to a range around the support shaft
110
a,
and although the angle is adjustable, the position in the vertical direction cannot be adjusted. For this reason, if the vertical position of the display
100
is incorrect when the device is mounted, the position cannot be adjusted to the optimum position even if the display
100
is tilted. Therefore, in the example shown in
FIG. 19
, the vertical position must be adjusted by moving the whole of the head mount display device vertically, so that it is necessary to perform the above-described mounting operation each time the vertical position is adjusted. This poses a problem in that the adjustment of position is very troublesome.
As a solution to this problem, Japanese Patent Laid-Open No. 9-280247 has disclosed a position adjusting mechanism in which the mounting construction of the connecting member
112
and the front frame
110
shown in
FIG. 20
is improved to facilitate the adjustment of vertical position of the display
100
.
This position adjusting mechanism consists of support shafts
110
a
and
110
b
and a connecting member
111
as shown in FIG.
20
. In this position adjusting mechanism, the front frame
110
on the mounting mechanism side is connected to the connecting member
111
via the support shaft
110
b,
and the connecting member
111
can be rotated around the support shaft
110
b
with respect to the front frame
110
. The support shaft
110
b,
like the support shaft
110
a,
is attached so as to be rotatable against a predetermined frictional force (higher than the gravity of the display
100
) with respect to the connecting member
111
. According to this mechanism, not only the display
100
can be tilted around the support shaft
110
a
but also the vertical position of the display
100
can be adjusted without repeating the mounting operation.
In
FIG. 20
, the support shaft
110
a
is taken as P
1
, the support shaft
110
b
as P
2
, the position of observer's eye as I, and the line of sight of the observer as L
1
. Also, the foot of the perpendicular drawn from P
1
to the line of sight L
1
is taken as H, and IH is an observation distance a representing the positional relationship between the display
100
and the position of observer's eye I. The observation distance a is a value determined in designing the head mount display device.
The position of P
2
on the mounting mechanism side and the position of observer's eye I depend on the shape and size of the head of an individual wearer and the condition in which the device is mounted, and is determined when the head mount display device is mounted on the head of the observer.
Therefore, when the observation distance a has an arbitrary value, the display device mounting position (support shaft)
110
a
(P
1
) is as described below.
First, since the length of P
1
H is a value inherent in the display device, if IH=a is determined, the length of IP
1
connecting the eye I and the display mounting position
110
a
are determined unequivocally. Further, since the length of P
1
P
2
is also a value inherent in the display device, P
1
is an intersection of an arc having a radius of IP
1
with I being the center and an arc having a radius of P
1
P
2
with P
2
being the center.
Therefore, in order to move the display
100
to the optimum observation position, it is necessary only that the display
100
be tilted around the support shaft
110
a
and the connecting member
111
is rotated around the support shaft
110
b.
In this case, however, the direction of the line of sight L
1
is determined unequivocally, and cannot take an arbitrary value.
On the other hand, when the direction of the line of sight L
1
is an arbitrary direction, the position of the display mounting portion
110
a
(P
1
) is determined as described below. If a straight line that is parallel with L
1
and is at a distance of P
1
H is taken as L
2
, P
1
lies on the straight line L
2
. Since the distance P
1
P
2
takes a value inherent in the display device, P
1
is an intersection of the straight line L
2
and an arc having a radius of P
1
P
2
with P
2
being the center. In this case, however, the observation distance a cannot take an arbitrary value.
In order for both of the observation distance a and the direction of the line of sight L
1
to be ca
Canon Kabushiki Kaisha
Chang Yean-Hsi
Fitzpatrick ,Cella, Harper & Scinto
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