JPH046040U

JPH046040U -

Info

Publication number: JPH046040U
Application number: JP4574790U
Authority: JP
Priority date: 1990-04-26
Filing date: 1990-04-26
Publication date: 1992-01-21

Description

[Brief explanation of the drawing]

第１図ないし第４図は本考案によるオーバーヘ
ツドプロジエクタの第１実施例を示す図であり、
第１図はその断面図、第２図はその斜視図、第３
図は液晶パネルの断面図、第４図はその平面図、
第５図は本考案の第２実施例に係る液晶パネルの
断面図、第６図は本考案の第３実施例に係るオー
バーヘツドプロジエクタの断面図、第７図はその
光路構成図、第８図は本考案の第３実施例の変形
例の断面図、第９図および第１０図は本考案の第
４実施例に係るオーバーヘツドプロジエクタの断
面図およびその要部の側面図、第１１図および第
１２図は従来のオーバーヘツドプロジエクタをそ
れぞれ示す斜視図、第１３図はその液晶表示体の
斜視図、第１４図はその液晶パネルの断面図であ
る。１……オーバーヘツドプロジエクタ、４……光
源、７……フレネルレンズ、２６……風向ガイド
、３０……液晶パネル、３１……液晶層、３３，
３４……偏光層。 1 to 4 are diagrams showing a first embodiment of an overhead projector according to the present invention,
Figure 1 is a sectional view, Figure 2 is a perspective view, and Figure 3 is a cross-sectional view.
The figure is a cross-sectional view of the liquid crystal panel, and Figure 4 is its plan view.
5 is a sectional view of a liquid crystal panel according to a second embodiment of the present invention, FIG. 6 is a sectional view of an overhead projector according to a third embodiment of the present invention, and FIG. 7 is a diagram of its optical path configuration. 8 is a cross-sectional view of a modification of the third embodiment of the present invention, FIGS. 9 and 10 are cross-sectional views of an overhead projector according to the fourth embodiment of the present invention, and side views of essential parts thereof. 11 and 12 are perspective views showing a conventional overhead projector, FIG. 13 is a perspective view of its liquid crystal display, and FIG. 14 is a sectional view of its liquid crystal panel. 1...Overhead projector, 4...Light source, 7...Fresnel lens, 26...Wind direction guide, 30...Liquid crystal panel, 31...Liquid crystal layer, 33,
34...Polarizing layer.

Claims

[Claims for Utility Model Registration] (1) A liquid crystal display is provided on the Fresnel lens, and a liquid crystal display is provided to project a liquid crystal image using light from a light source that passes through the liquid crystal display, and to cool the liquid crystal display. In the overhead projector configured to blow air to the body, a liquid crystal layer and a polarizing layer constituting the liquid crystal display are separated from each other, and the air blowing is carried out between them. head projector. (2) A wind direction guide for diffusing the wind direction so that the air is blown over the entire surface of the liquid crystal layer and the polarizing layer is provided on the upstream side of the liquid crystal display. overhead projector. (3) If the effective area of the Fresnel lens for projecting the liquid crystal image is A, the effective area of the polarizing layer is B, and the effective area of the liquid crystal layer is C, then there is a relationship of A≧B>C. Claim No. (1)
) overhead projector.