Telescopic sight with erector lens focus adjustment
First Claim
1. A telescopic sight apparatus in which the improvement comprises:
- housing tube means;
objective lens means and an eyepiece lens means mounted within said tube means;
focusing adjustment means including image erector lens means and lens mount means for mounting said erector lens means within said tube means between said objective lens means and said eyepiece lens means for longitudinal movement to adjust the focus of said sight apparatus;
control means for longitudinal movement of said erector lens means relative to said eyepiece lens means and said objective lens means by rotation of said control means about an axis of rotation which extends laterally to the direction of longitudinal movement of said erector lens means; and
coupling means including a coupling element extending laterally to the lens mount means and mounted at a position offset from the axis of rotation of said control means, for coupling said control means to said lens mount means and for causing longitudinal movement of said lens mount means by orbiting movement of said coupling element about the axis of rotation of the control means which extends substantially perpendicular to said direction of longitudinal movement in response to rotation of said control means to provide the focus adjustment of the sight apparatus.
1 Assignment
0 Petitions
Accused Products
Abstract
A telescopic sight is disclosed which may be used as a riflescope for viewing objects at different viewing distances. The telescopic sight is provided with a focus adjustment by longitudinal movement of the erector lens unit relative to an objective lens, an eyepiece lens and a reticle within the housing of such telescopic sight while maintaining a substantially constant magnification over the range of viewing distances. Such focus adjustment is accomplished in a simple manner with a rotatable knob coupled to the erector lens unit by a pin which is offset from the axis of rotation of such knob for orbital rotation, such axis of rotation extending laterally substantially perpendicular to the longitudinal movement of the erector lens unit. The focus adjustment pin is spring biased into engagement with a notch in a lens mounting tube containing the erector lens unit for longitudinal movement of the mounting tube in response to orbital rotation of the coupling pin by the focus adjustment knob. Rotation of the focus adjustment knob is limited by stops to less than 360° and is preferably limited to a 180° angle of adjustment. The objective lens and the eyepiece lens of the telescopic sight are fixed during focus adjustment of the erector lens unit, as is the reticle scale which is positioned between the eyepiece and the erector lens unit. As a result, telescopic sight is provided with substantially constant magnification throughout the range of focus adjustment so that the scope power changes less than 10.0% because the magnification of the erector lens unit changes less than 1.0% when focusing for objects at different viewing distances between infinity and 100 meters.
86 Citations
18 Claims
-
1. A telescopic sight apparatus in which the improvement comprises:
-
housing tube means; objective lens means and an eyepiece lens means mounted within said tube means; focusing adjustment means including image erector lens means and lens mount means for mounting said erector lens means within said tube means between said objective lens means and said eyepiece lens means for longitudinal movement to adjust the focus of said sight apparatus; control means for longitudinal movement of said erector lens means relative to said eyepiece lens means and said objective lens means by rotation of said control means about an axis of rotation which extends laterally to the direction of longitudinal movement of said erector lens means; and coupling means including a coupling element extending laterally to the lens mount means and mounted at a position offset from the axis of rotation of said control means, for coupling said control means to said lens mount means and for causing longitudinal movement of said lens mount means by orbiting movement of said coupling element about the axis of rotation of the control means which extends substantially perpendicular to said direction of longitudinal movement in response to rotation of said control means to provide the focus adjustment of the sight apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A telescopic sight apparatus of substantially constant magnification, in which the improvement comprises:
-
housing tube means; objective lens means and an eyepiece lens means mounted within said tube means; focusing adjustment means including image erector lens means and lens mount means for mounting said erector lens means within said tube means between said objective lens means and said eyepiece lens means for longitudinal adjustment to adjust the focus of said sight apparatus; control means for longitudinal movement of said erector lens means relative to said eyepiece lens means and said objective lens means by rotation of said control means about an axis of rotation of focusing the image of a viewed object over a wide range of viewing distances while maintaining image magnification substantially constant; and coupling means for coupling said control means to said lens mount means for causing longitudinal movement of said lens mount means in response to rotation of said control means to provide the focus adjustment of the sight apparatus, said coupling means includes a coupling element mounted at a position offset from the axis of rotation of said control means so that said coupling element orbits about said axis of rotation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
Specification