1. A gun, comprising:
(a) a stock having a fore end;
(b) a receiver carried by said stock;
(c) a barrel attached to said receiver, said barrel having a major axis, said stock including a fore end portion forward of said receiver for supporting said barrel, said fore end having a channel formed therein having an opening;
(d) a fire control system carried by said receiver and operated by a trigger for enabling a user to fire a round of ammunition through said barrel;
(e) a bracket attached to said fore end of said stock;
(f) a brace attached to said bracket;
(g) a first pivot housing and an opposing second pivot housing, said first and said second pivot housing bearing on said brace and being pivotally carried by said bracket, said first and second pivot housing having a hole formed therein;
(h) two parallel, spaced-apart channels formed in said fore end of said stock;
(i) a first leg slidably carried in said hole of said first pivot housing, said first leg dimensioned to fit within said first channel and to slide between a stored position in said first channel and an extended position outside said first channel, said first leg pivoting with said first pivot housing when said first leg is pivoted from said extended position to an in-use position approximately perpendicular to said barrel;
(j) a second leg slidably carried in said hole of said second pivot housing, said second leg dimensioned to fit within said second channel and to slide between a stored position in said second channel and an extended position outside said second channel, said second leg pivoting with said second pivot housing when said second leg is pivoted from said extended position to an in-use position approximately perpendicular to said barrel, said brace being formed so that, when said first and said second pivot housing are pivoted with respect to said brace, said first and second legs, pivotally carried by said first and second pivot housings, respectively, are parallel in said extended position and splayed in said in-use position;
(k) a first foot carried by said first leg and extending from said fore end of said stock when said first leg is in said stored position, said first foot serving as a handle for moving said first leg from said stored position to said extended position; and
(l) a first foot carried by said first leg and extending from said fore end of said stock when said first leg is in said stored position, said second foot serving as a handle for moving said second leg from said stored position to said extended position.
2. The gun as recited in claim 1, wherein said first and said second legs are telescoping.
3. The gun as recited in claim 1, wherein said bracket has a tang and said fore end of said stock has a side opposite said barrel, and wherein said tang is attached to said side of said fore end of said stock opposite said barrel.
4. The gun as recited in claim 3, wherein said brace is attached to said fore end of said stock.
5. The gun as recited in claim 1, further comprising a first spring and a second spring for urging said first leg and said second leg, respectively, to said stored and to said in-use position from said extended position.
6. The gun as recited in claim 5, wherein tension on said first and said second spring is adjustable.
7. The gun as recited in claim 5, further comprising a first collar carried by said first leg and a second collar carried by said second leg, said first and second springs having first ends being attached to said bracket and opposing second ends attached to said first and second collars, respectively.
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 optical information processing device compatible with an optical disc, as a recording medium, including at least three recording layers and a guide layer with a predetermined guide groove or pit arrays formed thereon, the optical information processing device comprising:
a first light source generating a first light beam used to reproduce an information signal recorded on the recording layers or to record an information signal on the recording layers;
a second light source generating a second light beam used to detect the guide groove or pit arrays provided on the guide layer;
an optical element irradiated with the second light beam and splitting the second light beam into at least two light beams to form their light converging spots at positions a predetermined distance away from each other in an optical axis direction;
an objective lens irradiated with the first light beam and the light beams split from the second light beam by the optical element, converging the first light beam on any one of the plurality of recording layers, and applying the light beams split from the second light beam by the optical element on the guide layer;
a photodetector separately detecting a reflected light beam of the first light beam, the reflected light beam coming from the recording layer, and at least two reflected light beams of the light beams split from the second light beam by the optical element, the reflected light beams coming from the guide layer;
a signal reproducing circuit performing reproduction process of the information signal recorded on the recording layer based on a detection signal detected by the photodetector, the detection signal being detected from the reflected light beam of the first light beam from the recording layer; and
a tracking error signal generating circuit controlling the tracking position of the objective lens relative to the recording layer based on detection signals detected by the photodetector, the detection signals being detected from the at least two reflected light beams of the second light beam from the guide layer.
2. The optical information processing device according to claim 1, wherein
the tracking error signal generating circuit is adapted to control the tracking position of the objective lens relative to the recording layer by adding a plurality of detection signals obtained from light beams detected by the photodetector, the light beams being obtained by splitting the second light beam by the optical element.
3. The optical information processing device according to claim 1, wherein
the optical element is a holographic grating with a grating pattern of unequally-spaced curved grooves.
4. The optical information processing device according to claim 3, wherein
the light beams split by the optical element are 0 order light (transmitted light), +1 order diffracted light and \u22121 order diffracted light of the second light beam.
5. A tracking control method used in an optical information processing device compatible with an optical disc, as a recording medium, including at least three recording layers and a guide layer with a predetermined guide groove or pit arrays formed thereon, the optical information processing device performing tracking control for the recording layers based on light reflected from the optical disc, the method comprising:
controlling tracking positions relative to the recording layer based on light beams reflected from the guide layer, the reflected light beams being derived from a light beam that is generated by a light source, split into at least two and applied to the guide layer.