What is claimed is:
1. An image inputting apparatus, comprising:
a photographic optical system for projecting an image of a subject;
an imaging device for converting the projected image into an image signal and outputting it;
a focus driving device which changes a focusing condition of the image projected to said imaging device by relatively moving at least one of a part or an entire of said photographic optical system and said imaging device to the other;
a first auto focusing device which sequentially evaluates said image signal obtained in each focusing condition while subsequently changes said focusing condition by controlling said focus driving device, and which obtains a predetermined focusing condition based on the evaluation;
a controlling device for controlling an operation of said first auto focusing device, and
a ranging device for measuring a subject distance which is a distance to said subject,
wherein said controlling device controls the operation of said first auto focusing device according to the subject distance obtained by said ranging device to prioritize either a focusing accuracy or a focusing speed.
2. The image inputting apparatus according to claim 1, wherein said controlling device controls said first auto focusing device so as to carry out said evaluation in a peripheral focusing range of a focusing condition which corresponds to the subject distance obtained by said ranging device, and sets a wideness and a narrowness of said peripheral focusing range in accordance with said subject distance.
3. The image inputting apparatus according to claim 2, wherein said controlling device sets said peripheral focusing range wider when said subject distance is more than a predetermined distance which is set previously compared with a case that said subject distance is less than said predetermined distance.
4. The image inputting apparatus according to claim 1, further comprising a second auto focusing device which obtains a predetermined focusing condition by controlling said focus driving device based on the subject distance obtained by said ranging device,
wherein said controlling device switches over between the operation of said first auto focusing device and an operation of said second auto focusing device according to said subject distance.
5. The image inputting apparatus according to claim 4, wherein said controlling device switches over between the operation of said first auto focusing device and the operation of said second auto focusing device to operate said first auto focusing device when said subject distance is more than a predetermined distance which is set previously and to operate said second auto focusing device when said subject distance is less than said predetermined distance.
6. The image inputting apparatus according to claim 1, wherein said ranging device measures a distance to each area of a plurality of different areas of said subject, respectively, and
said controlling device controls the operation of said first auto focusing device based on a plurality of distances to the each area obtained by said ranging device.
7. The image inputting apparatus according to claim 6, wherein said controlling device controls said first auto focusing device so as to carry out said evaluation in a peripheral focusing range of a focusing condition which corresponds to the subject distance obtained by said ranging device, and sets a wideness and a narrowness of said peripheral focusing range in pursuant to a presence or an absence of said subject which is mixed with a long distance and a short distance that is based on the distance to said each area.
8. The image inputting apparatus according to claim 7, wherein said controlling device sets said peripheral focusing range wider when said subject is not in a condition mixed with the long distance and the short distance compared with a case that the subject is in the condition mixed with the long distance and the short distance.
9. The image inputting apparatus according to claim 6, further comprising a second auto focusing device which obtains a predetermined focusing condition by controlling said focus driving device based on the subject distance obtained by said ranging device,
wherein said controlling device switches over between the operation of said first auto focusing device and an operation of said second auto focusing device corresponding to a presence or an absence of said subject which is mixed with a long distance and a short distance that is based on the distance to said each area.
10. The image inputting apparatus according to claim 9, wherein said controlling device switches over between the operation of said first auto focusing device and the operation of said second auto focusing device to operate said first auto focusing device when said subject is not in a condition mixed with the long distance and the short distance and to operate said second auto focusing device when said subject is in the condition mixed with the long distance and the short distance.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An abrasive machine (10), in particular a grinder for removal of material from an envelope surface of a substantially cylindrical work piece (34), said machine comprising:
a tubular cylindrical housing (13) extending about a longitudinal axis, said housing having a longitudinal cylindrical inner space (14) extending from a first end of said housing, said cylindrical inner space having a longitudinal axis which is offset from the longitudinal axis of said housing (13);
a shaft (17) arranged in said inner space (14) for angular displacement therein, said shaft being provided with a recess;
a motor (25) arranged in said recess;
a spindle (26) coupled to said motor (25), said spindle carrying a first rotatably driven tool (28);
a rotatable outer casing (15) peripherally enclosing said tubular cylindrical housing (13);
a lid member (30) associated with said outer casing (15) for co-rotation therewith, said lid member extending radially over a region of said first end of said tubular cylindrical housing (13) with said lid member being provided with a central through opening (31) having a peripheral surface (32);
a second rotatably driven tool (33) disposed on said peripheral surface (32) of said central through opening (31) of said lid member (30), and
support means (35) for holding said work piece (34) between said first and second rotatably driven tools (28;33);
wherein said shaft (17) is arranged in said inner space (14) such that when said shaft executes an angular displacement in said inner space, said first rotatably driven tool (28) is caused to effect a radial displacement relative said second rotatably driven tool (33).
2. The machine as claimed in claim 1, wherein said first rotatably driven tool (28) is adapted to act on an outer envelope surface of the work piece (34).