Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
1999-10-18
2001-10-09
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S201400, C250S216000
Reexamination Certificate
active
06300611
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a focus detecting device having a plurality of focus detecting areas and, more particularly, to an arrangement for joining together a focus detection sensor and a holding member which holds an optical member.
2. Description of Related Art
In Japanese Laid-Open Patent Application No. HEI 8-29652, there is disclosed, as shown in
FIG. 7
, an arrangement in which the positioning of a focus detecting sensor
1100
with respect to a body block
1000
is effected by pushing a pair of shafts
1210
provided on a sensor holder
1200
against a pair of bearings provided on the body block
1000
.
According to the arrangement disclosed in the above Japanese Laid-Open Patent Application No. HEI 8-29652, however, the inclination of a focus detecting device with respect to an optical axis is adjustable only in the direction of rotation around the pair of shafts
1210
. Depending on the allocation of a field of focus detection, therefore, any slanting state of the focus detecting sensor
1100
might be left unadjusted. Under such a condition, there is a possibility that it is impossible to have any adequate performance of the focus detecting device.
BRIEF SUMMARY OF THE INVENTION
In accordance with one aspect of the invention, there is provided a focus detecting device having a first holding member which holds a focus detecting sensor and a second holding member which holds at least an optical element, wherein at least one of a joint surface formed on the first holding member for joining with the second holding member and a joint surface formed on the second holding member for joining with the first holding member is in a curved surface shape, so that an angle at which the first holding member and the second holding member are mounted relative to each other is adjustable in directions of a plurality of axes.
The above and other aspects and features of the invention will become apparent from the following detailed description of a preferred embodiment thereof taken in connection with the accompanying drawings.
REFERENCES:
patent: 4413894 (1983-11-01), Miki et al.
patent: 5870636 (1999-02-01), Sugita et al.
patent: 5946516 (1999-08-01), Yoshida et al.
Allen Stephone B.
Canon Kabushiki Kaisha
Robin Blecker & Daley
LandOfFree
Focus detecting device and apparatus having the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detecting device and apparatus having the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting device and apparatus having the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2555038