Automatic instant focusing and exposing mechanism for photographic apparatus

An automatic instant focusing and exposing mechanism for photographic apparatuses, comprising:

• a base having fixed thereon two pins and a resilient member;
• a rotary focusing ring having a plurality of teeth at the periphery thereof and pivotally provided on said base;
• a ratchet set comprising a ratchet, a gear, and a pawl which is pivotally disposed on said base, one end of said pawl being a pawl portion with the other end thereof having a pin;
• a cam ring pivotally provided on said base and having a projecting rod, a first cam, a second cam, and a hooking member;
• a solenoid fixed onto said base for driving said cam ring;
• and
• a planetary gear set comprising a motor driven gear, an idle gear pivotally disposed on said base, a section of a ring-shape internal gear provided on said base, a swing arm pivotally disposed on said base and having a pin, and a pinion pivotally disposed on said swing arm and engaging with said internal gear,
• wherein said motor drives said motor driven gear, and, via the transmission of said idle gear, said pinion is caused to engage with said teeth provided on said focusing ring, so that said focusing ring changes its circumferential movement to linear movement to actuate the focusing operation;
• at this time, said first cam urges against said pin on said pawl so that said pawl hooks said ratchet to fix a focusing position, said solenoid simultaneously drives said projecting rod on said cam ring to an exposing position, and said second cam urges against said pin on said swing arm to disengage from said hooking member on said cam ring, so that said pinion engages with said internal gear;
• said motor further drives said gear of said planetary gear set and, via the transmission of said idle gear and said pinion, causes said swing arm to oscillate so that said swing arm actuates a shutter mechanism.