JPH0479312U

JPH0479312U -

Info

Publication number: JPH0479312U
Application number: JP12288390U
Authority: JP
Priority date: 1990-11-24
Filing date: 1990-11-24
Publication date: 1992-07-10

Description

[Brief explanation of the drawing]

第１図は、本考案に係る変倍光学系の位置検出
装置の一実施例の全体構成を示すブロツク図、第
２図は、同上実施例における抵抗体の等価回路図
、第３図は、その抵抗体の平面図、第４図ａは、
同上実施例における鏡胴に取り付けた摺動子と抵
抗体との関係を示す断面図、第４図ｂは、同上実
施例における摺動子と抵抗体および導体との配置
関係を示す平面図、第５図は、同上実施例におけ
る抵抗体上の摺動子の摺動位置を横軸にとり、出
力電圧を縦軸にとつたときの両者の関係を示す特
性図、第６図は、従来の変倍光学系の位置検出装
置の情報出力基板の全体構成を示すパターン図、
第７図は、第６図の情報出力基板の出力特性図、
第８図は、第６図の情報出力基板とブラシの位置
関係を示す一部省略の縦断面図、第９図は、従来
の変倍光学系の位置検出装置の全体の構成を示す
ブロツク図である。１０１……モータ制御装置、１０２……演算装
置、１０３……駆動用モータ、１０４……鏡胴、
１０５……摺動子、１０６……固定枠、１０７…
…抵抗板、１０８……抵抗体、１０８ａ，１０８
ｂ，１０８ｃ……凹部、１０９……導体、１１０
……Ａ／Ｄ変換器、１１１……Ｅ^２ＰＲＯＭ、Ｔ
１，Ｔ２，Ｔ３……端子。 FIG. 1 is a block diagram showing the overall configuration of an embodiment of a position detection device for a variable magnification optical system according to the present invention, FIG. 2 is an equivalent circuit diagram of a resistor in the same embodiment, and FIG. The plan view of the resistor, FIG. 4a, is
FIG. 4b is a cross-sectional view showing the relationship between the slider attached to the lens barrel and the resistor in the above embodiment, and FIG. Fig. 5 is a characteristic diagram showing the relationship between the sliding position of the slider on the resistor in the above embodiment on the horizontal axis and the output voltage on the vertical axis, and Fig. 6 is a characteristic diagram for the conventional example. A pattern diagram showing the overall configuration of the information output board of the position detection device of the variable magnification optical system,
Figure 7 is an output characteristic diagram of the information output board in Figure 6;
FIG. 8 is a partially omitted longitudinal sectional view showing the positional relationship between the information output board and the brush in FIG. 6, and FIG. 9 is a block diagram showing the overall configuration of a conventional position detection device for a variable magnification optical system. It is. 101... Motor control device, 102... Arithmetic device, 103... Drive motor, 104... Lens barrel,
105...Slider, 106...Fixed frame, 107...
...Resistance plate, 108...Resistance element, 108a, 108
b, 108c... recess, 109... conductor, 110
...A/D converter, 111...E ² PROM, T
1, T2, T3...terminals.

Claims

[Scope of Claim for Utility Model Registration] (1) A variable power optical system consisting of a variable power lens group and a focusing lens group arranged on the same optical axis; a resistor formed with a different width and to which a voltage is applied to both ends; and a resistor that is attached to the lens barrel of the variable magnification lens group and moves over the resistor in conjunction with movement of the variable magnification lens group on the optical axis. A slider that slides and generates an output voltage according to the amount of sliding, and that generates an output voltage whose slope of change in the output voltage changes when sliding at the portion where the formation width changes, and this slider an analog/digital converter that digitizes the output voltage of the converter; an arithmetic device that calculates focal length information of the variable magnification optical system based on the output of the analog/digital converter; A position detection device for a variable magnification optical system, comprising: drive control means for controlling the drive of the variable magnification drive means. (2) The plurality of zoom stop positions of the variable magnification lens group based on the calculation results of the calculation device are calculated using E ² PRO.
2. The position detection device for a variable magnification optical system according to claim 1, wherein the position detection device is stored in M.