Camera having blurring movement correction mechanism

• US 5,309,190 A
• Filed: 05/22/1992
• Issued: 05/03/1994
• Est. Priority Date: 05/31/1991
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Serikawa, Yoshio, Nishida, Tohru, Shinohara, Junichi, Ohno, Yoshimi
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): TUCCILLO, NICHOLAS
• Application Number:
  US07/887,136
• Time in Patent Office: 711 Days
• Field of Search: 354/795.1, 354/430, 354/222
• US Class Current: 396/55
• CPC Class Codes: G03B 2205/0007 Movement of one or more optical elements for control of motion blur imaging systems in general using optical elements for stabilisation of the position of the image G02B27/64
• CPC Class Codes: G03B 2205/0053 Driving means for the movement of one or more optical element
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

A camera having a blurring movement correction mechanism comprising: an optical element disposed in an optical path of a photo-taking optical system so as to correct shift of an image formed on a film surface caused by movement of hands holding a camera body. The camera further comprises: a detection unit for obtaining a blurring movement detection data by converting the blurring movement of the camera body to an electric signal; a calculation circuit for calculating blurring movement correction data for correcting the shift of the image formed on the film surface caused by movement of hands holding the camera body; a blurring movement correction actuator for moving the optical element in a necessary direction for correcting the shift of the image on the film surface on the basis of the blurring movement correction data obtained from the calculation circuit; and a noise removing circuit for removing transition output components included in the blurring movement detection data obtained from the detection unit which components are generated at a time when said blurring movement correction actuator is driven.

Claims

1. A camera having blurring movement correction mechanism, comprising:

a blurring movement correction optical element disposed in an optical path of a photo-taking optical system so as to correct shift of an image formed on a film surface caused by movement of hands holding a camera body;

a blurring movement detection unit for obtaining a blurring movement detection data by converting a blurring movement of said camera body to an electric signal;

a calculation means for calculating blurring movement correction data for correcting said shift of the image formed on the film surface caused by said movement of hands holding the camera body;

a blurring movement correction actuator for moving said optical element in a necessary direction in order to correct said shift of the image on the film surface on the basis of said blurring movement correction data obtained from said calculation means; and

a noise removing means for removing transition output components included in said blurring movement detection data obtained from said detection unit, said transition output components comprising noise signals of high frequency generated at the time when said blurring movement correction actuator is driven.

2. A camera having blurring movement correction mechanism according to claim 1, wherein said actuator is arranged to be driven intermittently and wherein said camera further comprises a control means for prefixingly holding said output data of said detection unit within a predetermined period from a starting time of the intermittent drive of said actuator by said drive signal in synchronization with a drive signal transmitted to said unit.

3. A camera having blurring movement correction mechanism according to claim 2, wherein said control means is arranged in such a way that the control means is synchronized with said drive signal and averages the output data of said detection unit included within a period from a starting time of the intermittent drive operation by said drive signal to a time when a predetermined time is elapsed.

4. A camera having blurring movement correction mechanism according to claim 2, wherein said control means is arranged in such a way that the control means is synchronized with said drive signal and predicts the output of said detection unit at a time when a predetermined time is elapsed from the starting time of said intermittent drive operation on the basis of the data at a time immediately before the starting time of said intermittent drive operation.

5. A camera having blurring movement correction mechanism according to claim 1, wherein said noise removing means comprises a low pass filter for removing transition output components of several KHz to several 10 KHz generated at the time when said blurring movement correction actuator is driven.