JPH041536U

JPH041536U -

Info

Publication number: JPH041536U
Application number: JP4201290U
Authority: JP
Priority date: 1990-04-19
Filing date: 1990-04-19
Publication date: 1992-01-08

Description

[Brief explanation of the drawing]

第１図ないし第６図は本考案によるオーバーヘ
ツドプロジエクタの一実施例を示す図であり、第
１図はオーバーヘツドプロジエクタの側面図、第
２図はその斜視図、第３図液晶表示体の斜視図、
第４図はその側面図、第５図はその折り畳み状態
を示す側面図、第６図は結像点を示す概念図であ
る。第７図は本考案の他の実施例を示す側面図、
第８図はフレネルレンズの洩れ光を説明する説明
図、第９図および第１０図は従来装置の各例を示
す斜視図、第１１図は従来より使用されている液
晶表示体を示す斜視図である。１……オーバーヘツドプロジエクタ、７……フ
レネルレンズ、１４……投影レンズ、２０……液
晶表示体、２５……結像点補正レンズ。 1 to 6 are views showing one embodiment of the overhead projector according to the present invention, in which FIG. 1 is a side view of the overhead projector, FIG. 2 is a perspective view thereof, and FIG. 3 is a liquid crystal display. perspective view of the body,
FIG. 4 is a side view thereof, FIG. 5 is a side view showing its folded state, and FIG. 6 is a conceptual diagram showing an imaging point. FIG. 7 is a side view showing another embodiment of the present invention;
Fig. 8 is an explanatory diagram for explaining leakage light from a Fresnel lens, Figs. 9 and 10 are perspective views showing examples of conventional devices, and Fig. 11 is a perspective view showing a conventionally used liquid crystal display. It is. DESCRIPTION OF SYMBOLS 1... Overhead projector, 7... Fresnel lens, 14... Projection lens, 20... Liquid crystal display, 25... Image-forming point correction lens.

Claims

[Claims for Utility Model Registration] (1) In an overhead projector that condenses and magnifies light from an image display body on a Fresnel lens with a projection lens and projects it onto a screen with a projection mirror, An overhead projector characterized in that an imaging point correction lens that corrects an imaging point of a projected image that changes depending on the optical path length with the lens can be inserted between an image display body and a projection lens. (2) Claim (1) characterized in that the image display body is a liquid crystal display body, and the image forming point correction lens is integrally attached to the liquid crystal display body.
Overhead projector as described in section. (3) The overhead projector according to claim 2, wherein the liquid crystal display is shaped to block light leaking from the Fresnel lens.