JPH0213216U

JPH0213216U -

Info

Publication number: JPH0213216U
Application number: JP9073388U
Authority: JP
Priority date: 1988-07-08
Filing date: 1988-07-08
Publication date: 1990-01-26

Description

[Brief explanation of drawings]

第１図は本考案を施した撮影レンズの断面図、
第２図は同撮影レンズに用いる弾性部材の拡大斜
視図、第３図は同撮影レンズのリヤコンポーネン
トレンズとフオトインタラプタとの関係を示した
要部分解斜視図、第４図は同撮影レンズの制御部
のブロツク線図、第５図はフオトインタラプタの
出力温度特性図、第６図は従来の自動焦点機能付
撮影レンズの略図、第７図は別の自動焦点機能付
撮影レンズの略図である。 α…レンズ光軸、１Ｃ…リヤコンポーネントレ
ンズ、２…鏡胴、３…画像読取り素子、６…レン
ズ枠、１２…遮光板、１３…フオトインタラプタ
、１４…発光素子、１５…受光素子。 Figure 1 is a cross-sectional view of the photographic lens to which the present invention has been applied.
Fig. 2 is an enlarged perspective view of an elastic member used in the photographic lens, Fig. 3 is an exploded perspective view of the main parts showing the relationship between the rear component lens and the photo interrupter of the photographic lens, and Fig. 4 is an exploded perspective view of the photographic lens. A block diagram of the control unit, FIG. 5 is an output temperature characteristic diagram of the photo interrupter, FIG. 6 is a schematic diagram of a conventional photographic lens with an autofocus function, and FIG. 7 is a schematic diagram of another photographic lens with an autofocus function. . α... Lens optical axis, 1C... Rear component lens, 2... Lens barrel, 3... Image reading element, 6... Lens frame, 12... Light shielding plate, 13... Photo interrupter, 14... Light emitting element, 15... Light receiving element.

Claims

[Scope of utility model registration request]

This is an autofocus photographing lens system that determines the focus state by comparing the image formation state on an image reading element before and after the rear component lens moves, and in which a light shielding plate is fixed to the lens frame of the rear component lens, and the movement trajectory of the light shielding plate is fixed to the lens frame of the rear component lens. A photointerrupter including a light-emitting element and a light-receiving element facing each other is provided, and when the output of the light-receiving element reaches a value approximately halfway between the maximum output voltage and current, it is determined that the initial position is reached. Lens drive device.