Image display device
First Claim
Patent Images
1. An image display device comprising:
- a light source;
a screen which is irradiated with light from the light source to form an image;
an optical system which generates a virtual image with the light from the screen; and
a driving unit which moves the screen in an optical axis direction, wherein;
the driving unit includes;
a holder which holds the screen,a plurality of elastic members which support the holder so as to enable the holder to reciprocally move in the optical axis direction, anda driving source which generates force for moving the holder in the optical axis direction,the plurality of elastic members are disposed so as to be arranged in the optical axis direction, andbuckling rigidity of one of the plurality of elastic members is set to be different from buckling rigidity of another one of the plurality of elastic members.
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Accused Products
Abstract
An image display device includes a light source, a screen, an optical system and a driving unit. The screen is irradiated with light from the light source to form an image. The optical system generates a virtual image with the light from the screen. The driving unit moves the screen in an optical axis direction. The driving unit includes a holder, one or more elastic members and a driving source. The holder holds the screen. The one or more elastic members support the holder so as to enable the holder to reciprocally move in the optical axis direction. The driving source generates force for moving the holder in the optical axis direction.
10 Citations
15 Claims
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1. An image display device comprising:
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a light source; a screen which is irradiated with light from the light source to form an image; an optical system which generates a virtual image with the light from the screen; and a driving unit which moves the screen in an optical axis direction, wherein; the driving unit includes; a holder which holds the screen, a plurality of elastic members which support the holder so as to enable the holder to reciprocally move in the optical axis direction, and a driving source which generates force for moving the holder in the optical axis direction, the plurality of elastic members are disposed so as to be arranged in the optical axis direction, and buckling rigidity of one of the plurality of elastic members is set to be different from buckling rigidity of another one of the plurality of elastic members. - View Dependent Claims (2, 3, 4)
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5. An image display device comprising:
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a light source; a screen which is irradiated with light from the light source to form an image; an optical system which generates a virtual image with the light from the screen; and a driving unit which moves the screen in an optical axis direction, wherein; the driving unit includes; a holder which holds the screen, one or more elastic members which support the holder so as to enable the holder to reciprocally move in the optical axis direction, and a driving source which generates force for moving the holder in the optical axis direction, the screen has a substantially rectangular shape in outline, the driving source includes a base, a magnetic circuit which is installed on the base, and a coil to which a magnetic field from the magnetic circuit is applied, the coil being installed on the holder, the magnetic circuit includes; a pair of first yokes arranged in a direction parallel to a long side of the screen so as to sandwich the screen, which each has a substantially U shape structure including a first inside wall portion disposed at a side near the screen and a first outside wall portion disposed at a side far from the screen, a pair of first magnets which are installed so as to face each other on an inside surface of each of the pair of first yokes, a pair of second yokes arranged in a direction parallel to a short side of the screen so as to sandwich the screen, which each has a substantially U shape structure including a second inside wall portion disposed at a side near the screen and a second outside wall portion disposed at a side far from the screen, and a pair of second magnets which are installed so as to face each other on an inside surface of each of the pair of second yokes, and the coil is disposed so as to be inserted both in a gap between the pair of first magnets and in a gap between the pair of second magnets. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. An image display device comprising:
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a light source; a first screen which is irradiated with light from the light source to form an image; a second screen which is irradiated with light from the light source to form an image; an optical system which generates a virtual image with the light from the first screen and the second screen; a driving unit which moves the first screen in an optical axis direction; and an image processing unit which modulates according to an image signal the light with which the first screen and the second screen are irradiated, wherein the second screen is fixed on the driving unit at a position displaced with respect to the first screen in a direction orthogonal to the optical axis direction, which is outside of a movement range of the first screen moved by the driving unit. - View Dependent Claims (14, 15)
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Specification