US 8,465,157 B2Granted

Projection type image display

AssigneeHitachi Consumer Electronics Co., Ltd.

InventorsKoshu Ichikawa, Hiroyuki Inoue, Toshihiko Matsuzawa

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Abstract

A projection type image display apparatus for projecting optical fluxes from a light source onto a projection plane so as to display an image, provided with a reflection mirror arranged in such a manner that the reflection mirror interrupts an optical path of the projection light in the direct projection mode when the reflection mode is set and reflects the projection light to the backside of the projection type image display apparatus, and when the reflection mode is set, the projection type image display apparatus is tilted to the backside. The projection type image display apparatus is further provided with an adjustment leg arranged in a front portion of a bottom plane of the projection type image display apparatus and extended by a predetermined leg length, and thereby the projection type image display apparatus is tilted to the backside.

Claims7

Dependent claims

A projection type image display apparatus for projecting optical fluxes from a light source onto a projection plane so as to display thereon a image, wherein said projection type image display apparatus has a direct projection mode for projecting projection light ahead of said projection type image display apparatus and a reflection mode for projecting projection light to a backside of said projection type image display apparatus, comprising:

a reflection mirror arranged in such a manner that said reflection mirror interrupts an optical path of the projection light in said direct projection mode when said reflection mode is set and reflects the projection light to the backside of the projection type image display apparatus, and said projection type image display apparatus is tilted to the backside when said reflection mode is set;
and
an adjustment leg arranged in a front portion of a bottom plane of said projection type image display apparatus, which is extended to a predetermined leg length, and said projection type image display apparatus is tilted to the backside by extending said adjustment leg;
wherein:
said adjustment leg has a stopping spring at one end portion of a shaft portion having a screw groove;
said stopping spring has a latching portion which is deformed by screwing the shaft portion in a radial direction of said shaft portion;
said adjustment leg is extended in a sliding manner due to self-weight of said adjustment leg, and said latching portion of said stopping spring constitutes a stopper;
and
after said latching portion of said stopping spring abuts, said latching portion is deformed in the radial direction of said shaft portion by screwing said shaft portion to cause the stopper to be released, and said sliding of said adjustment leg is adjusted finely by screwing.

6 more elements

A projection type image display apparatus comprising:

a projection lens for projecting projection light produced by modulating light from a light source based upon an image signal onto a screen;
a reflection mirror for reflecting said projection light projected through the projection lens;
and
an adjustment leg for tilting said projection type image display apparatus at a predetermined angle in a projection direction;
wherein said projection lens, said reflection mirror, and said adjustment leg are arranged on the same side of said projection type image display apparatus,
wherein setting directions of said projection type image display apparatus with respect to the screen are opposite between the case that the projection light is directly projected through said projection lens onto the screen and the case that the projection light is projected through the projection lens onto the screen by being reflected by said reflection mirror,
wherein in such a case that the projection light is projected through the projection lens onto the screen by being reflected on the reflection mirror, said projection light passes through an upper area of said projection type image display apparatus to be projected onto the screen;
wherein said adjustment leg has a stopping spring at one end portion of a shaft portion having a screw groove;
wherein said stopping spring has a latching portion which is deformed by screwing the shaft portion in a radial direction of said shaft portion;
wherein said adjustment leg is extended in a sliding manner due to self-weight of said adjustment leg, and said latching portion of said stopping spring constitutes a stopper;
and
wherein after said latching portion of said stopping spring abuts, said latching portion is deformed in the radial direction of said shaft portion by screwing said shaft portion to cause the stopper to be released, and said sliding of said adjustment leg is adjusted finely by screwing.

9 more elements

Dependencies are inferred from the claim text.