Optical apparatus having a motor control device

[54] OPTICAL APPARATUS HAVING A MOTOR CONTROL DEVICE

[75] Inventors: Harushige Yamamoto, Yamato;

Yoshiyuki Kaneko, Kawasaki, both of
Japan

[73] Assignee: Canon Kabushiki Kaisha, Tokyo,
Japan

[21] Appl. No.: 194,648
[22] Filed: Feb. 10,1994

Related U.S. Application Data

[63] Continuation of Ser. No. 832,993, Feb. 10,1992, abandoned. [30] Foreign Application Priority Data

Feb. 12, 1991 [JP] Japan 3-019024

[51] Int. CI.6 G03B 1/18; G03B 3/00

[52] U.S. CI 396/133; 396/86

[58] Field of Search 354/195.1, 195.11,

354/195.12, 452, 400

[56] References Cited

U.S. PATENT DOCUMENTS 4,734,726 3/1988 Takahashi et al 354/195.1

4,857,947 8/1989 Wakabayashi et al 354/195.1

4,866,468 9/1989 Himuro et al 354/195.1

4,897,681 1/1990 Yamamoto et al 354/271.1

4,908,647 3/1990 Ueyama 354/402

4,922,274 5/1990 Yamamoto et al 354/271.1

5,124,737 6/1992 Inoue et al 354/400

5,150,260 9/1992 Chigira 357/694

5,187,513 2/1993 Imanari et al 354/195.1

5,264,888 11/1993 Inoue et al 354/400

5,311,230 5/1994 Ogawa 354/195.12

Primary Examiner—Michael L. Gellner

Assistant Examiner—Nicholas J. Tuccillo

Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &

Scinto

[57] ABSTRACT

An optical apparatus having a movable member movable with a stepping motor as a drive source, and movement controller for moving the movable member to a set position. The movement controller step-drives the stepping motor in one direction by a first frequency so that the movable member may bear against a stopper member, and after the bearing of the movable member against the stopper member is discriminated, step-drives the stepping motor by a predetermined amount in the other direction by a second frequency, which is smaller than the first frequency, and the position of the movable member in that state is defined as the set position.

35 Claims, 3 Drawing Sheets

16