JPH0396613U

JPH0396613U -

Info

Publication number: JPH0396613U
Application number: JP403990U
Authority: JP
Priority date: 1990-01-20
Filing date: 1990-01-20
Publication date: 1991-10-03

Description

[Brief explanation of drawings]

第１図は本考案に係るカメラのズーム倍率検出
装置の一実施例の概略構成を示す斜視図、第２図
は検出板の平面図、第３図は検出板の電気回路図
、第４図は出力電圧と検出位置との関係を示す説
明図、第５図は本実施例の全体構成を示す説明図
、第６図は検出板の他の例を示す正面図である。１……ズーム鏡胴部、２……摺動子、３……検
出板、４……抵抗板、５……導体パターン部、６
ａ，６ｃ……電極、６ｂ……中間電極、７……検
出回路、８……Ａ／Ｄ変換部、９……制御部、１
０……ＣＰＵ、１１……ズーム駆動用モータ、１
２……モータドライバ、１３，ＳＷ……短絡手段
。 FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the zoom magnification detection device for a camera according to the present invention, FIG. 2 is a plan view of the detection plate, FIG. 3 is an electric circuit diagram of the detection plate, and FIG. 4 5 is an explanatory diagram showing the relationship between output voltage and detection position, FIG. 5 is an explanatory diagram showing the overall configuration of this embodiment, and FIG. 6 is a front view showing another example of the detection plate. DESCRIPTION OF SYMBOLS 1...Zoom lens barrel, 2...Slider, 3...Detection plate, 4...Resistance plate, 5...Conductor pattern part, 6
a, 6c... Electrode, 6b... Intermediate electrode, 7... Detection circuit, 8... A/D conversion section, 9... Control section, 1
0...CPU, 11...Zoom drive motor, 1
2...Motor driver, 13, SW...Short circuit means.

Claims

[Scope of utility model registration request]

The zoom magnification is determined based on a resistor plate and a slider that slide relative to each other in conjunction with the zoom lens barrel, and an output voltage that changes as the position of the resistor plate and slider to which voltage is applied changes. In a zoom magnification detection device for a camera equipped with a detection circuit for detecting, an intermediate electrode is provided in an intermediate portion of the resistor plate, and short-circuiting means is provided to electrically short-circuit the intermediate electrode and one end of the resistor plate. A zoom magnification detection device for a camera, characterized in that, when a short circuit occurs due to the short circuit means, the zoom magnification can be detected by the detection circuit based on a change in the position of the slider in a portion of the resistor plate that is not short circuited. .