5results about How to "Wide-angle" patented technology

This invention relates to the field of optical lenses, and discloses a camera optical lens comprising seven lenses, arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the first lens is f1, the central radius of curvature of the object side of the fifth lens is R9, the central radius of curvature of the image side of the fifth lens is R10, the axial thickness of the fourth lens is d7, and the axial distance from the image side of the fourth lens to the object side of the fifth lens is d8, and satisfies the following relationships: 1.00≤f1 / f≤2.00; 5.00≤d7 / d8≤10.00; 2.00≤R9 / R10≤8.00. This camera lens not only boasts excellent optical performance but also meets the design requirements of large aperture, wide-angle, and ultra-thin design.

This invention provides a camera optical lens, comprising, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has negative refractive power. The field of view (FOV) of the camera optical lens is , the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the axial distance from the image side of the second lens to the object side of the third lens is d4, and the axial distance from the image side of the third lens to the object side of the fourth lens is d6, satisfying the following relationships: 100.00°≤FOV≤135.00°; -5.00≤f6 / f7≤-1.00; 0.85≤d4 / d6≤5.00. This camera optical lens not only possesses excellent optical performance but also meets the design requirements of a large aperture and wide angle.

This invention relates to the field of optical lenses and discloses a camera optical lens comprising seven lenses, arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, the axial thickness of the first lens is d1, and the axial distance from the image side of the first lens to the object side of the second lens is d2, satisfying the following relationships: -10.00≤f4 / f≤10.00; 1.00≤d1 / d2≤3.00; 2.00≤(R3+R4) / (R3-R4)≤7.00. This camera lens not only boasts excellent optical performance but also meets the design requirements of large aperture, wide-angle, and ultra-thin design.

This invention relates to the field of optical lenses and discloses a camera optical lens comprising seven lenses, arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, the axial thickness of the third lens is d5, and the axial distance from the image side of the third lens to the object side of the fourth lens is d6, and satisfies the following relationships: -10.00≤f4 / f≤10.00; 4.00≤d5 / d6≤8.00; 2.00≤(R3+R4) / (R3-R4)≤10.00. This camera lens not only boasts excellent optical performance but also meets the design requirements of large aperture, wide-angle, and ultra-thin design.

This utility model relates to the field of mechanical equipment. The technical solution of this utility model is as follows: a sand dressing device with a wall-mounted grinding wheel bracket, comprising a base, characterized in that: a grinding wheel is provided on the base, and a dressing mechanism is also provided at the front end of the base. The dressing mechanism includes a dressing track fixed to the front side of the base, a movable block is slidably arranged on the dressing track, a connecting rod is rotatably arranged on the movable block, a fixed rod is connected to the upper end of the connecting rod, and a dressing head is provided on the fixed rod; the dressing head includes a mounting plate, a screw is provided inside the mounting plate, a handle is also provided at one end of the screw, a fixed block is slidably arranged on the screw, and a diamond pen is also provided on the fixed block.