Television – Camera – system and detail – Camera image stabilization
Reexamination Certificate
1997-08-11
2001-06-05
Garber, Wendy R. (Department: 2612)
Television
Camera, system and detail
Camera image stabilization
C359S554000
Reexamination Certificate
active
06243132
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a jitter control apparatus for a video camera, and more particularly, to a jitter control apparatus for a video camera for preventing jitter of the screen caused by vibrations of the hands of the user.
It is difficult to videotape with recently developed home video cameras designed to be hand held without a support such as a tripod since there are jitters on the screen due to vibrations of the hands of the user.
To account for such a problem, a conventional jitter control apparatus for a video camera includes a variable angle prism respectively shown in
FIGS. 1A through 1C
. Referring to
FIG. 1A
, a variable angle prism
10
arranged on a light path is comprised of a pair of glass plates
11
and
13
and a bellows
14
. The bellows
14
is formed of a resin such as polyethylene and are fixed so as to connect the frames of the two glass plates
11
and
13
. An enclosed inner space is formed between the two glass plates
11
and
13
. The bellows
14
can be folded or unfolded by an external force. The inner space between the two glass plates
11
and
13
is filled with a transparent fluid
12
such as silicon oil.
In the operation of the variable angle prism having the above structure, referring to
FIG. 1B
, when the two glass plates
11
and
13
are parallel, the angle of incidence and the angle of emission of light
16
are the same. However, as shown in
FIGS. 1A and 1C
, when a predetermined angle is generated between the two glass plates
11
and
13
, light
15
and
17
, respectively, refracts at a predetermined angle, passing through the two glass plates
11
and
13
.
The vibrations of the hands of the user is sensed by a sensor (not shown). The angle between the glass plates
11
and
13
is controlled by driving an actuator (not shown) for driving the glass plates
11
and
13
according to the sensed signal. Therefore, jitters of the screen due to vibrations of the hands can be prevented by differentiating the angle of emission of the light passing through the glass plates
11
and
13
from the angle of incidence.
However, since the apparatus for preventing jitters of a video camera is operated by folding or unfolding the bellows
14
, the bellows
14
may break after prolonged use and the liquid
12
between the glass plates
11
and
13
may leak and contaminate the inside of the camera. Also, it is difficult to assemble and manufacture the apparatus.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a jitter control apparatus for a video camera designed to be assembled and manufactured easily and in which a bellows and oil are not used.
To achieve the above object, there is provided a jitter control apparatus for a video camera according to the present invention, comprising a first optical prism installed to be rectilinearly transferable in a right-angled direction with respect to an optical axis for refracting and transmitting incident light so that the angle of emission is smaller than the angle of incidence with respect to the transfer direction, a first actuator for rectilinearly transferring the first optical prism, a second optical prism installed to be adjacent to the first optical prism and rectilinearly transferred in a right-angled direction with respect to the direction in which the first optical prism is transferred for refracting and transmitting the incident light so that the angle of emission is smaller than the angle of incidence with respect to the direction in which the second optical prism is transferred, and a second actuator for rectilinearly transferring the second optical prism, wherein the image formed on the photographing screen is prevented from vibrating by appropriately transferring the first and second optical prisms according to the degree of jitter of the incident image.
REFERENCES:
patent: 5172268 (1992-12-01), Kikuchi
patent: 5280387 (1994-01-01), Maruyama
patent: 5768016 (1998-06-01), Kanbara
patent: 1-140119 (1989-06-01), None
patent: 1223413 (1989-09-01), None
patent: 3-248136 (1991-11-01), None
patent: 10113247 (1998-05-01), None
Jang Duk-Hwan
Lee Sung-hee
Moon Jae-ho
Park Gi-Soo
Burns Doane , Swecker, Mathis LLP
Garber Wendy R.
Moe Aung S.
Samsung Electronics Co,. Ltd.
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