PROJECTION VIDEO DISPLAY DEVICE

• US 20160209739A1
• Filed: 09/13/2013
• Published: 07/21/2016
• Est. Priority Date: 09/13/2013
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Inventors: MATOBA, Kosuke, ISHIBASHI, Atsushi, MORIYA, Toshiyuki, KANEKO, Kazuomi, ISHIZU, Takafumi, HIRATA, Koji
• Granted Patent: US 9,846,354 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G03B 21/145 Housing details, e.g. position adjustments thereof
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 21/30 adapted to collapse or fold, e.g. for portability
• CPC Class Codes: H04N 9/3173 wherein the projection device is specially adapted for enhanced portability

Abstract

Without increasing the size of a projection video display device that has a mirror that can be raised and lowered, this invention makes it easy to raise and lower said mirror. In order to do so, this projection video display device, which enlarges and projects an image from an image-displaying means, has a housing (10) and a raisable/lowerable mirror (30) wherein: a power supply, a light source, and a lens unit are accommodated inside the housing (10); said lens unit enlarges light from the light source after said light has been directed to the aforementioned image-displaying means; and the raisable/lowerable mirror (30) covers a projection-light opening (26) formed in the top surface of the housing (10), is provided so as to be able to rotate with respect to the housing (10), and has a convex mirror (110) on the inside surface thereof. With the raisable/lowerable mirror (30) covering the top surface of the housing (10), the top surface of the projection video display device forms a smoothly connected, smooth, convexly curved surface with no height difference between the edge of the raisable/lowerable mirror (30) and the front edge of the opening (26), and a half-bowl-shaped concavity (45) is formed on at least one side of the raisable/lowerable mirror (30) in the direction of the axis of rotation thereof.

Claims

1. A projection video display device which enlarges and projects an image from an image-displaying means, comprising:

a housing which encloses a power supply, a light source, and a lens unit which guides light from the light source to the image-displaying means and, after that, enlarges the light; and

a raisable/lowerable mirror which covers a projection-light opening formed on a top surface of the housing, is installed to be rotatable with respect to the housing, and has a convex mirror on an inside surface thereof,

wherein, when the raisable/lowerable mirror covers the top surface of the housing, a top surface of the projection video display device becomes a convexly curved surface which is smoothly connected with no height difference in an up/down direction between an edge of the raisable/lowerable mirror and a front edge of the opening, and a half-bowl-shaped concavity is formed on at least one side surface in a rotation shaft direction of the raisable/lowerable mirror.

2. The projection video display device according to claim 1, wherein the raisable/lowerable mirror is formed to have a surface where two side surfaces in the rotation shaft direction are extended in an up/down direction, the concavities are formed with the two side surfaces of the raisable/lowerable mirror and the top surface of the housing, so that the two side surfaces can be used as grip portions at the time of manually rotating the raisable/lowerable mirror.

3. The projection video display device according to claim 2, wherein concave portions gripped by fingers of an operator of the projection video display device are formed on the two side surfaces.

4. The projection video display device according to claim 1, wherein a front edge portion of the opening formed on the top surface of the housing is formed in the vicinity of lower limit light at an outer side of an image range from an optical path of the lower limit light of reflection light which passes through the lens unit and is reflected on the convex mirror of the raisable/lowerable mirror when the raisable/lowerable mirror is opened.

5. The projection video display device according to claim 4, wherein a front edge side of the concavity formed on the side surface of the raisable/lowerable mirror is formed in the vicinity of the lower limit light at the outer side of the image range from the optical light of the lower limit light.

6. The projection video display device according to claim 4, wherein a shape of a bottom surface of the concavity formed on the side surface of the raisable/lowerable mirror is formed in the vicinity of the lower limit light at the lower side or the image range from the optical path of the lower limit light of the reflection light reflected on the convex mirror of the raisable/lowerable mirror.

7. The projection video display device according to claim 1, wherein a position of a center of rotation of the raisable/lowerable mirror is defined inside the housing so that an upper edge of the convex mirror and an upper edge of a projection lens as a final stage of the lens unit are set to be substantially at the same height in the state where the raisable/lowerable mirror is closed.

8. The projection video display device according to claim 1, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.

9. The projection video display device according to claim 2, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.

10. The projection video display device according to claim 3, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.

11. The projection video display device according to claim 4, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.

12. The projection video display device according to claim 5, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.

13. The projection video display device according to claim 6, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.

14. The projection video display device according to claim 7, wherein a maximum length of the raisable/lowerable mirror in the rotation shaft direction is such a length that an operator can grip the projection video display device by only one hand.