Projector
AssigneeCanon Kabushiki Kaisha
InventorsHirokuni Takano, Takaya Konishi
Life of this patent
Estimating the term…
Abstract
In a rear projector for projecting an image from behind a screen, its screen size is variable. In order to permit flexible adaptation to the variation in the screen size, the projector is constructed to permit easy adjustment of a detection device for detecting an image display position or a position indicated on the screen.
Claims22
A projector of a rear projection type for projecting an image from behind a screen, said projector comprising:
- an upper part including a screen of a predetermined size;
- and
- a lower part including projection means for projecting an image onto the screen and detection means for detecting information on the screen,
- wherein an optical axis of said projection means and an optical axis of said detection means are kept in parallel,
- wherein said upper part is replaceable with an another upper part having a screen of another size different from said screen of the predetermined size.
A projector of a rear projection type for projecting an image from behind a screen, said projector comprising:
- an upper part including a screen of a predetermined size;
- and
- a lower part including projection means for projecting an image onto the screen and detection means for detecting information indicated on the screen from the front side of the screen, said projection means including image forming means for forming the image,
- wherein said projection means and said detection means are integrally formed to maintain an optical axis of said projection means and an optical axis of said detection means in parallel.
A projector of a rear projection type for projecting an image from behind a screen, said projector comprising:
- an upper part including a screen of a predetermined size and a reflecting mirror for guiding an image to be projected onto the screen;
- a lower part to which said upper part is mounted, said lower part including projection means for projecting the image onto the screen and detection means for detecting information on the screen;
- and
- positioning and fixing means for performing positioning and fixation between said upper part and said lower part, said positioning and fixing means enabling said upper part to be movable in a direction along a horizontal direction of said screen and in a direction of rotation of said screen about a predetermined axis,
- wherein an optical axis of said projection means and an optical axis of said detection means are kept in parallel.
A projector of a rear projection type for projecting an image from behind a screen, said projector comprising:
- an upper part including a screen of a predetermined size;
- and
- a lower part including a projection device which projects an image onto the screen and a detection device which detects information on the screen,
- wherein an optical axis of said projection device and an optical axis of said detection device are kept in parallel,
- wherein said upper part is replaceable with an another upper part having a screen of another size different from said screen of the predetermined size.
A projector of a rear projection type for projecting an image from behind a screen, said projector comprising:
- an upper part including a screen of a predetermined size;
- and
- a lower part including a projection device which projects an image onto the screen and a detection device which detects information indicated on the screen from the front side of the screen, said projection device including an image forming device which forms the image,
- wherein said projection device and said detection device are integrally formed to maintain an optical axis of said projection device and an optical axis of said detection device in parallel.
A projector of a rear projection type for projecting an image from behind a screen, said projector comprising:
- an upper part including a screen of a predetermined size and a reflecting mirror for guiding an image to be projected onto the screen;
- a lower part to which said upper part is mounted, said lower part including a projection device which projects the image onto the screen and a detection device which detects information on the screen;
- and
- a positioning device and a fixing device which perform positioning and fixation, respectively, between said upper part and said lower part, said positioning and fixing devices enabling said upper part to be movable in a direction along a horizontal direction of said screen and in a direction of rotation of said screen about a predetermined axis,
- wherein an optical axis of said projection device and an optical axis of said detection device are kept in parallel.
Dependencies are inferred from the claim text.