JPH0185721U

JPH0185721U -

Info

Publication number: JPH0185721U
Application number: JP17881587U
Authority: JP
Priority date: 1987-11-26
Filing date: 1987-11-26
Publication date: 1989-06-07

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例によるオーバーヘ
ツド・プロジエクタの構成図、第２図は第１図の
光源と反射鏡を固定した投影レンズの駆動装置の
構成図、第３図は従来のオーバーヘツド・プロジ
エクタの構成図、第４図は第３図のスクリーンに
投影された画像の輪郭の一態様を示す正面図であ
る。１１……光源、１２……反射式集光レンズ、１
３……投影レンズ、１４……反射鏡、１５……ス
クリーン、ｋ……光軸。 Fig. 1 is a block diagram of an overhead projector according to an embodiment of this invention, Fig. 2 is a block diagram of a projection lens driving device in which the light source and reflecting mirror of Fig. 1 are fixed, and Fig. 3 is a block diagram of a conventional overhead projector. FIG. 4 is a block diagram of the head projector, and is a front view showing one aspect of the outline of the image projected onto the screen of FIG. 3. 11...Light source, 12...Reflective condensing lens, 1
3...Projection lens, 14...Reflector, 15...Screen, k...Optical axis.

Claims

[Scope of utility model registration request]

a light source, a reflective condensing lens arranged on the optical axis of the light source and condensing the light from the light source, and a reflective condensing lens arranged on the optical axis of the light reflected by the condensing lens and conjugate with the light source. The light source includes a projection lens in a positional relationship, and a reflecting mirror that is fixed to the projection lens and that bends the optical axis of the light source passing through the projection lens at right angles toward the screen and projects the light onto the screen. An overhead projector characterized in that the projection lens is configured to be movable in a direction perpendicular to the screen while maintaining the conjugate positional relationship.